Subjects -> METALLURGY (Total: 58 journals)
Showing 1 - 10 of 10 Journals sorted alphabetically
Acta Metallurgica Slovaca     Open Access   (Followers: 2)
Advanced Device Materials     Open Access   (Followers: 6)
American Journal of Fluid Dynamics     Open Access   (Followers: 44)
Archives of Metallurgy and Materials     Open Access   (Followers: 9)
Asian Journal of Materials Science     Open Access   (Followers: 4)
Canadian Metallurgical Quarterly     Hybrid Journal   (Followers: 21)
Complex Metals     Open Access   (Followers: 2)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 24)
Graphene and 2D Materials     Open Access   (Followers: 6)
Handbook of Ferromagnetic Materials     Full-text available via subscription   (Followers: 1)
Handbook of Magnetic Materials     Full-text available via subscription   (Followers: 2)
High Temperature Materials and Processes     Open Access   (Followers: 6)
Indian Journal of Engineering and Materials Sciences (IJEMS)     Open Access   (Followers: 11)
International Journal of Metallurgy and Alloys     Full-text available via subscription   (Followers: 1)
International Journal of Metals     Open Access   (Followers: 7)
International Journal of Minerals, Metallurgy, and Materials     Hybrid Journal   (Followers: 11)
International Journal of Mining and Geo-Engineering     Open Access   (Followers: 4)
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 5)
ISIJ International - Iron and Steel Institute of Japan     Full-text available via subscription   (Followers: 26)
Izvestiya Vuzov. Poroshkovaya Metallurgiya i Funktsional’nye Pokrytiya (Proceedings of Higher Schools. Powder Metallurgy аnd Functional Coatings)     Full-text available via subscription   (Followers: 2)
JOM Journal of the Minerals, Metals and Materials Society     Hybrid Journal   (Followers: 35)
Journal of Central South University     Hybrid Journal   (Followers: 1)
Journal of Cluster Science     Hybrid Journal  
Journal of Heavy Metal Toxicity and Diseases     Open Access  
Journal of Iron and Steel Research International     Hybrid Journal   (Followers: 11)
Journal of Materials & Metallurgical Engineering     Full-text available via subscription   (Followers: 2)
Journal of Materials Processing Technology     Hybrid Journal   (Followers: 21)
Journal of Metallurgical Engineering     Open Access   (Followers: 4)
Journal of Sustainable Metallurgy     Hybrid Journal   (Followers: 3)
Materials Science and Metallurgy Engineering     Open Access   (Followers: 6)
Metal Finishing     Full-text available via subscription   (Followers: 20)
Metallurgical and Materials Engineering     Open Access   (Followers: 7)
Metallurgical and Materials Transactions A     Hybrid Journal   (Followers: 41)
Metallurgical and Materials Transactions B     Hybrid Journal   (Followers: 32)
Metallurgical and Materials Transactions E     Full-text available via subscription   (Followers: 2)
Metallurgical Research and Technology     Full-text available via subscription   (Followers: 8)
Metallurgy and Foundry Engineering     Open Access   (Followers: 2)
Mining, Metallurgy & Exploration     Hybrid Journal  
Powder Diffraction     Full-text available via subscription   (Followers: 1)
Powder Metallurgy     Hybrid Journal   (Followers: 36)
Powder Metallurgy and Metal Ceramics     Hybrid Journal   (Followers: 8)
Powder Metallurgy Progress     Open Access   (Followers: 5)
Practical Metallography     Full-text available via subscription   (Followers: 6)
Rare Metals     Hybrid Journal   (Followers: 3)
Revista de Metalurgia     Open Access  
Revista del Instituto de Investigación de la Facultad de Ingeniería Geológica, Minera, Metalurgica y Geográfica     Open Access  
Revista Remetallica     Open Access   (Followers: 1)
Revue de Métallurgie     Full-text available via subscription  
Russian Metallurgy (Metally)     Full-text available via subscription   (Followers: 4)
Science and Technology of Welding and Joining     Hybrid Journal   (Followers: 7)
Steel Times lnternational     Partially Free   (Followers: 19)
Transactions of the IMF     Hybrid Journal   (Followers: 14)
Transactions of the Indian Institute of Metals     Hybrid Journal   (Followers: 5)
Tungsten     Hybrid Journal  
Universal Journal of Materials Science     Open Access   (Followers: 3)
Welding in the World     Hybrid Journal   (Followers: 7)
Welding International     Hybrid Journal   (Followers: 11)
Вісник Приазовського Державного Технічного Університету. Серія: Технічні науки     Open Access  
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Rare Metals
Journal Prestige (SJR): 0.454
Citation Impact (citeScore): 1
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1001-0521 - ISSN (Online) 1867-7185
Published by Springer-Verlag Homepage  [2626 journals]
  • Fluorescent graphene oxide derived from carbonized citric acid for
           copper(II) ions detection
    • Abstract: Abstract Fluorescent graphene oxide (GO) nanoparticles were obtained from the thermal carbonization of citrate acid. Depending on the synthesizing temperature, the size of GO varied from several to several hundred nanometers. Owing to the confinement from the size, green and blue emissions at around 504 and 450 nm were observed from the GO suspension. These emissions could be dynamically quenched by titrating against copper (II) (Cu2+) ions, and the emission intensity was reduced exponentially as a function of Cu2+ concentration. The quenching mechanism was ascribed to the bridging of the surface –COOH and –OH groups by Cu2+, which restricted the vibration of edge atoms or clusters and reduced the number of luminophores of GO nanosheets. As a result, the concentration of Cu2+ was detectable with the fluorescent intensity of GO.
      PubDate: 2021-01-10
       
  • In situ deformation behavior of TC21 titanium alloy with different α
           morphologies (equiaxed/lamellar)
    • Abstract: To study the effect of α phase morphology (equiaxed α (αE)/lamellar α (αL)) on the in situ tensile behavior of TC21 alloy, the slip band, dislocation, crack initiation, and propagation were analyzed by scanning electron microscopy (SEM) with in situ tensile stage and transmission electron microscopy (TEM). The results show that the slip bands first concentrate in the αE phases and easily truncate at the α/β phase boundaries, whereas the slip bands move across the α lamellae in the αL phase. Microcracks are easily generated in αE or α/β phase boundaries with large plastic deformation. When the quantity of αL is more than αE, the crack tip is more easily deflected at α phases or α clusters with different orientations, making the main crack propagation path more zigzag. When the volume fraction ratio of αE to αL is ~ 3:4, i.e., the volume fraction of αE is close to that of αL, TC21 alloy exhibits better strength and slower crack propagation rate. Graphic abstract
      PubDate: 2021-01-09
       
  • Dielectric relaxation and conduction behaviors of Aurivillius Na 0.5 Bi
           4.5 Ti 4 O 15 ceramics with Na doping
    • Abstract: Abstract Aurivillius Na0.5Bi4.5Ti4O15 and Bi4Ti3O12 compounds were synthesized via solid-state reaction technique. X-ray powder diffraction study confirmed monophasic four-layered Na0.5Bi4.5Ti4O15 and three-layered Bi4Ti3O12 ceramics. Dielectric relaxation and conduction behaviors of Na-contained Na0.5Bi4.5Ti4O15 ceramics were thoroughly investigated in a large scale of temperature of 30–650 °C and frequency of 40 Hz–1 MHz. In addition, comparative studies of both the compounds were discussed. Impedance and modulus analyses revealed a single relaxation behavior in Na0.5Bi4.5Ti4O15 compound which was originated from the grain’s interior with grain resistance of 2.189 × 105 Ω and capacitance of 4.268 × 10−10 F at 570 °C. While in Bi4Ti3O12 ceramic the relaxation was due to the contributions of grain and grain boundaries. Alternating current (AC) conductivity analysis revealed the presence of two different conduction regions in both the compounds. Activation energies for the two different conduction mechanisms, i.e., in low-temperature region and in high-temperature region were calculated to be ~ 0.23 and ~ 1.27 eV at 1 kHz for Na0.5Bi4.5Ti4O15 compound and ~ 0.43 eV and ~ 0.97 eV at 1 kHz for Bi4Ti3O12 compound, respectively. The present study of dielectric relaxation and conduction behaviors would be helpful for further investigations of Na0.5Bi4.5Ti4O15-related Aurivillius compounds.
      PubDate: 2021-01-09
       
  • Electrolytes speed up development of zinc batteries
    • PubDate: 2021-01-07
       
  • Fabrication and characterization of nanoporous Ag–Pt alloy
    • Abstract: Abstract Nanoporous Ag–Pt bi-metallic alloy was fabricated by free dealloying of amorphous Ag-based precursor with the nominal composition of Ag38.25Pt0.5Cu38.75Si22.5. The noble Ag and Pt were left after the less noble Cu and Si dissolved in a certain acid solution. Bi-continuous nanoporous microstructure was formed with asymmetric ligaments and pores with typically 30–200 nm in width. The trace addition of Pt has refined the grains of the ligaments to the average size of less than 20 nm in the substrate and induced the formation of rods with nanopores. The morphologies of the rods were observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) both in the form of clusters and as scattered individuals with characteristic length of several micrometers and diameter of tens of nanometers. The grains sizes in the rods were finer than those in the ligaments. The good mechanical integrity might be due to the combination of continuous ligaments and clusters of rods.
      PubDate: 2021-01-07
       
  • Stacking fault, dislocation dissociation, and twinning in Pt 3 Hf
           compounds: a DFT study
    • Abstract: The Pt3Hf compound plays a decisive role in strengthening Pt–Hf alloy systems. Evaluating the stacking fault, dislocation dissociation, and twinning mechanisms in Pt3Hf is the first step in understanding its plastic behavior. In this work, the generalized stacking fault energies (GSFE), including the complex stacking fault (CSF), the superlattice intrinsic stacking fault (SISF), and the antiphase boundary (APB) energies, are calculated using first-principles calculations. The dislocation dissociation, deformation twinning, and yield behavior of Pt3Hf are discussed based on GSFE after their incorporation into the Peierls-Nabarro model. We found that the unstable stacking fault energy (γus) of (111)APB is lower than that of SISF and (010) APB, implying that the energy barrier and critical stress required for (111)APB generation are lower than those required for (010)APB formation. This result indicates that the \(a\left\langle {1\bar{1}0} \right\rangle\) superdislocation will dissociate into two collinear \({a \mathord{\left/ {\vphantom {a 2}} \right. \kern-0pt} 2}\left\langle {1\bar{1}0} \right\rangle\) superpartial dislocations. The \({a \mathord{\left/ {\vphantom {a 2}} \right. \kern-0pt} 2}\left\langle {1\bar{1}0} \right\rangle\) dislocation could further dissociate into a \({a \mathord{\left/ {\vphantom {a 6}} \right. \kern-0pt} 6}\left\langle {\bar{1}\bar{1}2} \right\rangle\) Shockley dislocation and a \({a \mathord{\left/ {\vphantom {a 3}} \right. \kern-0pt} 3}\left\langle {2\bar{1}\bar{1}} \right\rangle\) super-Shockley dislocation connected by a SISF, which results in an APB → SISF transformation. The study also discovered that Pt3Hf exhibits normal yield behavior, although the cross-slip of a \({a \mathord{\left/ {\vphantom {a 2}} \right. \kern-0pt} 2}\left\langle {1\bar{1}0} \right\rangle\) dislocation is not forbidden, and the anomalous yield criterion is satisfied. Moreover, it is observed that the energy barrier and critical stress for APB formation increases with increasing pressure and decreases as the temperature is elevated. When the temperature rises above 1400 K, the \({a \mathord{\left/ {\vphantom {a 2}} \right. \kern-0pt} 2}\left\langle {1\bar{1}0} \right\rangle\) dislocation slipping may change from the {111} planes to the {100} planes. Graphical abstract
      PubDate: 2021-01-07
       
  • High-pseudocapacitance of porous and square NiO@NC nanosheets for
           high-performance lithium-ion batteries
    • Abstract: Layered nickel oxides have been focused with intense research interests as high-performance lithium-ion batterie (LIB) anode. However, it is hard to obtain few layered nickel oxides material directly as it easily forms bulk material with the strong interaction between the interlayer. In this work, two-dimensional (2D) nickel-based coordination polymers were successfully prepared according to aqueous phase copolymerization approach. And then uniform carbon-doped NiO nanosheets were successfully obtained from facile solution assembly and post-thermal treatment. The detailed electrochemical testing shows that the uniform NiO nanocrystals encapsulated into porous N-doped carbon (NiO@NC) nanosheets present much higher rate capability with the discharge specific capacity of 782.7 mAh·g−1 at high current density of 2.0 A·g−1 than pure NiO (690 mAh·g−1). It also shows long-term cycling performance with 91% retention after 50 cycles at 1.0 A·g−1. The high rate capability, cycling stability and the easy synthesis make NiO@NC nanosheets as a promising candidate for LIB anode and build up new way for the fabrication of metal oxides anode materials. Graphical abstract
      PubDate: 2021-01-07
       
  • Photocatalytic and photochemical processes of AgCl/TiO 2 studied with a
           fully integrated X-ray photoelectron spectrometer
    • Abstract: A fully integrated X-ray photoelectron spectrometer (XPS) was employed for the investigation of the separation processes and recombination behaviors of photogenerated electrons and holes on the surface of AgCl and ultra-small nano-titanium oxide cluster composite photocatalyst (AgCl/TiO2). A facile route, by direct colloidal synthesis, for preparing AgCl/TiO2 with high stability and enhanced visible light (Vis) driven catalytic activity was reported. The photocatalytic activity of AgCl/TiO2, which revealed that the photo-degradation rate of the as-prepared AgCl/TiO2 was nearly 10.5 times higher than that of bare AgCl, was evaluated by applying it to the photo-degradation of methyl orange (MO) in water solution. Moreover, AgCl/TiO2 exhibited an outstanding long-term stability during ten cycles of photo-degradation. The band gap of AgCl decreased from 3.25 to 2.85 eV because of the ultra-small nano-TiO2 clusters that were pinned to its surface. The results indicate that the band gap narrowing and surface plasmon resonance (SPR) of Ag (0) were two major contributors to the enhancement of the photocatalytic activity of AgCl/TiO2 by improving the utilization of Vis. In situ XPS analysis was, therefore, certified as a beneficial method to explore the catalytic mechanism of photocatalysts. Graphic abstract
      PubDate: 2021-01-07
       
  • Rare earth element-doped porous In 2 O 3 nanosheets for enhanced
           gas-sensing performance
    • Abstract: Rare earth (La, Pr, Sm, Ce and Yb)-doped porous In2O3 nanosheets are prepared by a solvothermal method. The effect of rare earth elements on the structure, morphologies and gas-sensing performance of In2O3 nanosheets is systematically investigated. The mixed phase composed of c-In2O3 and rh-In2O3 can be transformed into rh-In2O3 by doping with rare earth elements. After doping with rare earth elements, the morphology can be changed from compact nanosheets to porous sheets. Compared with pure In2O3 and La, Pr, Sm, Ce-doped porous In2O3 nanosheets, Yb-doped In2O3 nanosheets present the best gas-sensing performance. Among 3%–10% Yb-doped samples, 6% Yb-doped In2O3 porous nanosheets exhibit the optimal gas-sensing performance to 5 × 10−6–750 × 10−6 acetone, giving a high response of 15.3 toward 50 × 10−6 acetone and fast response/recovery time at the operating temperature of 220 °C. Moreover, 6% Yb-doped porous In2O3 nanosheet sensor also exhibits excellent selectivity and stability, indicating its potential in the next-generation gas sensor. Graphic abstract
      PubDate: 2021-01-07
       
  • Electrochemical dissolution behavior of gold and its main coexistent
           sulfide minerals in acid thiocyanate solutions
    • Abstract: Electrochemical tests were developed to investigate the electrochemical dissolution behavior of gold and its main coexistent sulfide minerals in acid thiocyanate solutions. The optimal leaching conditions for gold in acidic thiocyanate system were pH 2, 0.15 mol·L−1 thiocyanate and 0.2 g·L−1 Fe3+. Fe3+ addition to the acidic thiocyanate system promoted gold dissolution significantly, arsenopyrite dissolution was inhibited, chalcopyrite dissolution was increased, and the dissolution behavior of other associated minerals remained mostly unchanged. Thiocyanate made gold and associated mineral leaching easier. The galvanic corrosion effect of gold and its main coexistent sulfide minerals in an acidic thiocyanate-free system was that the chalcocite, arsenopyrite and pyrite acted as a cathode to reduce anodic gold dissolution; galena as an anode undergoes oxidation to inhibit anodic gold dissolution. There was almost no galvanic corrosion behavior between stibnite, yellow sphalerite and black sphalerite and gold. Thiocyanate addition changed the galvanic corrosion behavior of stibnite and yellow sphalerite in the thiocyanate system, which inhibited anodic gold dissolution. In the acidic thiocyanate system in the presence of ferric iron, the arsenopyrite promoted anodic gold dissolution, the chalcocite and gold were mostly free of galvanic corrosion, and the remaining minerals inhibited anodic gold dissolution.
      PubDate: 2021-01-07
       
  • Chemical synthesis and characterization of SmCo 5 /Co magnetic
           nanocomposite particles
    • Abstract: Magnetic nanocomposite material has been widely focused for the potential to become the next generation of magnetic material. In this paper, two kinds of chemical coating methods were used to prepare SmCo5/Co nanocomposite particles which were further characterized and compared. The two methods were carried out by using different materials and at different temperatures. In Method I, oleylamine (OAm), oleic acid and Ca(acac)2 were used and the reaction was carried out at the temperature of 300 °C. In Method II, anhydrous isopropanol, polyvinylpyrrolidone (PVP), N2H4·H2O and CoCl2·6H2O were used and the reaction temperature was ~ 55 °C. It was found that by using the two methods, the growth and the crystal structure of the Co nanoparticles (NPs) are different. In Method I, epitaxial growth on the surface of SmCo5 NPs was observed and the Co NPs were in a face-centered close packing crystal structure. While in Method II, the coated Co NPs were self-nucleated with a crystal structure of hexagonal close packing. Using Method II with the addition of surfactant, anisotropic nanocomposite particles were achieved with an enhanced saturated magnetization of 84.2 A·m2·kg−1. And the coercivity change of the NPs illustrates that a nonmagnetic interlayer between the hard and soft magnetic phase is beneficial to maintain the coercivity. Graphic abstract
      PubDate: 2021-01-07
       
  • When thermoelectric materials come across with magnetism
    • Abstract: Nowadays, thermoelectric materials have attracted a lot of attention as they can directly convert heat into electricity and vice versa. However, while strenuous efforts have been made, those conventional strategies are still inevitably going to meet their performance optimization limits. For this reason, brand new strategies are badly needed to achieve further enhancement. Here, the roles played by magnetism in recent advances of thermoelectric optimization are concluded. Firstly, magnetic thermoelectric materials can just be treated like other normal materials because the use of universal optimization strategies can still get good results. So, it is not a situation which is all or nothing and the tactics of using magnetism for thermoelectric optimization can coexist with other strategies. Besides, through magnetic doping, we can introduce and adjust magnetism in materials for further optimization. Magnetism provides more possibilities in thermoelectric optimization as it can directly influence the spin states in materials. Furthermore, in the form of magnetic second-phase nanoclusters, magnetism can be introduced to thermoelectric materials to conquer the dilemma that the solid solubility of many magnetic ions in thermoelectric materials is too low to have any significant effect on thermoelectric properties. Finally, when exposed to an external magnetic field, topological materials can rely on its unique band structures to optimize. Graphic
      PubDate: 2021-01-07
       
  • Cobalt monosulfide nanofibers: ethanol sensing and magnetic properties
    • Abstract: Metal sulfide nanomaterials have attracted great interest because of their excellent properties and promising applications in sensing, energy harvesting, magnetic and optoelectronic devices, especially their well-aligned crystalline nanostructures are highly desirable for the enhanced performance and novel applications. In this study, the cobalt monosulfide (CoS) nanofibers with uniform shape and good crystallinity were firstly obtained via electrospinning and atmospheric calcination routes under controllable conditions. It was found that the CoS nanofibers exhibited ethanol sensing properties at the optimum working temperature of 200 °C, the response was 11.6 toward 100 × 10−6 ethanol gas, and the CoS nanofibers-based sensor exhibits a short response time and recovery time of 5 and 6 s at the optimum temperature, respectively, the result also shows that the sensor has good stability after 50 days, which would be a favorable characteristic as a promising sensor. In addition, the Pauli paramagnetic property of CoS nanofibers was also investigated at room temperature. Graphic abstract
      PubDate: 2021-01-07
       
  • Enhanced formaldehyde sensitivity of two-dimensional mesoporous SnO 2 by
           nitrogen-doped graphene quantum dots
    • Abstract: Formaldehyde (HCHO) is widely known as an indoor air pollutant, and the monitoring of the gas has significant importance. However, most HCHO sensing materials do not have low detection limits and operate at high temperatures. Herein, two-dimensional (2D) mesoporous ultrathin SnO2 modified with nitrogen-doped graphene quantum dots (N-GQDs) was synthesized. The N-GQDs/SnO2 nanocomposite demonstrated high efficiency for HCHO detection. With the addition of 1.00 wt% N-GQDs, the response (Ra/Rg) of SnO2 gas sensor increased from 120 to 361 at 60 °C for the detection of 10 × 10−6 HCHO. In addition, the corresponding detection limit was as low as 10 × 10−9. Moreover, the sensor exhibited excellent selectivity and stability for the detection of HCHO. The enhanced sensing performance was attributed to both the large specific surface area of SnO2 and electron regulation of N-GQDs. Therefore, this study presents a novel HCHO sensor, and it expands the research and application potential of GQDs nanocomposites. Graphical abstract
      PubDate: 2021-01-07
       
  • Hot tensile deformation behavior and constitutive model of ZK61M
           high-strength magnesium alloy sheet
    • Abstract: Hot deformation behavior of the annealed ZK61M magnesium alloy sheet was explored using tensile tests with strain rates varying from 0.001 to 0.030 s−1 in temperatures range of 423–513 K. The obtained results indicate that the flow stress increased with deformation temperature decreasing and strain rate increasing. Dynamic recrystallization (DRX) occurs when the temperature is higher than 423 K, and the recrystallization volume fraction increases with temperature rising. At a given temperature, the measured DRX volume fraction at a higher strain rate is smaller than that at a lower strain rate. Dimples are observed throughout the tested temperature range. Moreover, they grow larger as temperature increases. An average absolute relative error (AARE) of 2.65% proves that the peak stress predicted by the constitutive model is in good agreement with the experimental results. The correlation coefficient (R’) obtained for the predicted stress and the experimental value considering the strain on the material constant are between 0.9831 and 0.9977. In addition, AARE and root mean square error (RMSE) are less than 6.5% and 8.5 MPa, respectively. This indicates that the deviation of the predicted value from the experimental value is small and the predictions of the proposed model are reliable. Graphic abstract
      PubDate: 2021-01-07
       
  • A novel three-step approach to separate cathode components for lithium-ion
           battery recycling
    • Abstract: Lithium-ion batteries (LIBs) represent efficient energy storage technology that can help to alleviate fossil fuel-based CO2 emissions. Presently, LIBs are being applied extensively in consumer electronics and electric vehicles, but because of limited resources, there is an urgent need for spent LIB recycling technologies. The complexity of LIBs, especially the electrode part, makes it difficult to achieve precision separations for each single component from the used electrode with low emissions. Herein, we propose a three-step treatment for the separation of cathode components. In detail, detaching of the current collector from the cathode is accomplished by the solvent method, which was found to be an ideal strategy compared with previous reports. Then, a thermal treatment is used to remove the polymer binder in the second step because we demonstrated that it is challenging to separate polyvinylidene fluoride (PVDF) from other cathode components by dissolution with N-methylpyrrolidone. The separation efficiency between the active material and conductive carbon by the polymer solution in the third step showed reasonably good results. We anticipate this work will serve as an important reference for the separation of each single electrode component in both laboratory- and industrial-scale applications. Separation of binder and development of novel binders, which can be easily recycled for sustainable LIBs, are fruitful areas for further research. Graphic abstract
      PubDate: 2021-01-07
       
  • Plate-like carbon-supported Fe 3 C nanoparticles with superior
           electrochemical performance
    • Abstract: Iron-based anodes for lithium-ion batteries (LIBs) with higher theoretical capacity, natural abundance and cheapness have received considerable attention, but they still suffer from the fast capacity fading. To address this issue, we report a facile synthesis of plate-like carbon-supported Fe3C nanoparticles through chemical blowing/carbonization under calcination. The ultrafine Fe3C nanoparticles are prone to be oxidized when exposing in air; thus, Fe3C/C with mild oxidization and the fully oxidized product of Fe2O3/C are successfully prepared by controlling the oxidization condition. When applied as an anode material in LIB, the Fe3C/C electrode demonstrates excellent cycle stability (826 mAh·g−1 after 120 cycles under 500 mA·g−1) and rate performance (410.6 mAh·g−1 under 2 A·g−1), compared with the Fe2O3/C counterpart. The enhanced electrochemical performance can be ascribed to the synergetic effect of the Fe3C with mild oxidation and the unique hierarchical structure of plate-like carbon decorated with Fe3C catalyst. More importantly, this work may offer new approaches to synthesize other transition metal (e.g., Co, Ni)-based anode material by replacing the precursor ingredient. Graphic abstract
      PubDate: 2021-01-07
       
  • Recent advance in single-atom catalysis
    • Abstract: Abstract Single-atom catalysts (SACs) have obtained a great deal of attention in many catalytic fields due to the high atom utilization efficiency and high catalytic activity. Recently, great achievements on SACs have been made for thermocatalysis, electrocatalysis, and photocatalysis which play an important role in obtaining value-added products. However, it remains a great challenge to fabricate SACs with high metal loading and investigate their reaction mechanisms. Therefore, it is necessary to highlight the recent development of SACs in these fields to guide future research. In this review, we overviewed the thermocatalysis applications of SACs in CO oxidation, preferential oxidation of CO, water-gas shift reaction, methane conversion, methanol steam reforming, aqueous-phase reforming of methanol, hydrogenation of alkynes and dienes, hydrogenation of CO, and hydrogenation of substituted nitroarenes. Moreover, the oxygen reduction reaction (ORR), hydrogen evolution reaction (HER), oxygen evolution reaction (OER), CO2 reduction reaction (CO2RR), and N2 reduction reaction (N2RR) for photocatalytic and electrocatalytic fields were also overviewed. Lastly, the opportunities and challenges of SACs were pointed out.
      PubDate: 2021-01-07
       
  • Electrodeposited transparent PEDOT for inverted perovskite solar cells:
           improved charge transport and catalytic performances
    • Abstract: The acidic, corrosive effect of sodium polystyrene sulfonate (PSS) in poly 3,4-ethylenedioxythiophene:sodium polystyrene sulfonate (PEDOT:PSS) limits the stability of inverted perovskite solar cells (PSCs) based on the ITO/PEDOT:PSS/perovskite/PCBM/BCP/Ag structure. In this work, a poly 3,4-ethylenedioxythiophene (PEDOT) hole transport layer (HTL) with high hole mobility and good catalytic performance was prepared by electrochemical cyclic voltammetry (CV) method for inverted PSCs. By controlling the CV cycles (from 1 to 5 cycles) and EDOT monomer solution concentration (from 0.5 to 2.0 mmol·L−1) of electrochemical deposition, the thickness, morphology, optical and electrochemical properties of PEDOT could be accurately adjusted. The optimal photovoltaic performance with current density (Jsc) of 22.19 mA·cm−2, open circuit voltage (Voc) of 0.94 V, fill factor (FF) of 0.65 and photoelectric conversion efficiency of 13.56% was obtained when deposition of PEDOT with 1 CV cycle and EDOT concentration of 0.5 mmol·L−1. At this point, the perovskite showed good crystallization, optimal optical, charge transport and recombination performance, resulting in better Voc and photoelectric conversion efficiency (PCE) compared to the devices with higher CV cycle numbers and 3,4-ethylenedioxythiophene (EDOT) concentration. For comparison with spin-coated PEDOT:PSS, the device with electrodeposited PEDOT showed improved Jsc and comparable Voc, which may result from its better charge transport and catalytic ability. The device with spin-coated PEDOT:PSS showed photoelectric conversion efficiency of 12.25%, which was lower than that based on electrodeposited PEDOT (13.56%) with 1 CV cycles and 0.5 mmol·L−1 EDOT concentration. And the device with electrodeposited PEDOT as HTLs showed more excellent air stability. In ambient air ((32 ± 5) °C and RH: 70% ± 20%), it still maintained more than 80% of the initial photoelectric conversion efficiency after 1000 h. In comparison, the photoelectric conversion efficiency of the device with PEDOT:PSS decreased to 20% of the initial value after storage for 500 h. From this study, a facial and low-cost way to prepare PEDOT HTL with high performances that better than the traditional PEDOT:PSS has been explored, which is expected to eliminate the acidic, corrosive effect of PSS in PEDOT:PSS. Graphic abstract
      PubDate: 2021-01-07
       
  • Recent advances and perspective in metal coordination materials-based
           electrode materials for potassium-ion batteries
    • Abstract: Recently, to ameliorate the forthcoming energy crisis, sustainable energy conversion and storage devices have been extensively investigated. Potassium-ion batteries (KIBs) have aroused widespread attention in these very active research applications due to their earth abundance and similar low redox potential compared to Li-ion batteries (LIBs). It is critical to develop electrode materials with large ion diffusion channels and robust structures for long cycling performance in KIBs. Metal coordination materials, including metal–organic frameworks, Prussian blue, and Prussian blue analogue, as well as their composites and derivatives, are known as promising materials for high-performance KIBs due to their open frameworks, large interstitial voids, functionality and tailorability. In this review, we give an overview of the recent advances on the application of metal coordination materials in KIBs. In addition, the methods to enhance their K-ion storage properties are summarized and discussed, such as morphology engineering, doping, as well as compositing with other materials. Ultimately, some prospects for future research of metal coordination materials for KIBs are also proposed. Graphic abstract
      PubDate: 2021-01-07
       
 
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