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 Ionics   [SJR: 0.486]   [H-I: 36]   [2 followers]  Follow         Hybrid journal (It can contain Open Access articles)    ISSN (Print) 1862-0760 - ISSN (Online) 0947-7047    Published by Springer-Verlag  [2353 journals]
• Cobalt imidazoledicarboxylate coordination complex microspheres: stable
intercalation materials for lithium and sodium-ion batteries
• Authors: Hailong Fei; Yaqin Lin; Tan Xu
Pages: 1949 - 1954
Abstract: Abstract A simple and versatile method for preparation of cobalt 4,5-imidazoledicarboxylate microspheres is developed. The cobalt 4,5-imidazoledicarboxylate complex is a kind of stable intercalation materials for lithium- and sodium-ion batteries. When tested as an anode material for lithium-ion batteries, the coordination complex microspheres based composite electrode delivers a second discharge capacity of 595.4 mAh g−1 at a current density of 1 Ah g−1. A reversible capacity of 416.1 mAh g−1 remained after 143 cycles, while a reversible capacity of 259.9 mAh g−1 remained after 500 cycles at a current density of 1.5 A g−1. In addition, it can also serve as stable anode materials for sodium-ion batteries. Research based on the topics would shed some light on the discovery of new alternative intercalation materials to graphite.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2033-x
Issue No: Vol. 23, No. 8 (2017)

• Synthesis, characterization, and cell performance of Li 0.5 FeV 1.5 O 4
• Authors: Shamik Chakrabarti; Awalendra K. Thakur; K. Biswas
Pages: 1985 - 1993
Abstract: Abstract A Li0.5FeV1.5O4 sample was synthesized using sol-gel route. The X-ray diffraction study indicates formation of spinel phase (with Fd3m space group) for this sample. LiO4, LiO6, and V-O bonds were identified from the Raman spectrum, while LiO4 and Fe-O bonds were identified from the FTIR spectrum of this sample phase. The FESEM study indicates formation of inhomogeneous grains. The surface area of 74.39 m2/g was estimated from the Brunauer-Emmett-Teller (BET) surface area analysis technique. The cyclic voltammetry study of Li0.5FeV1.5O4 indicates an anodic peak at 2.1 V while a cathodic peak at 1.98 V. The charge-discharge study exhibits two voltage plateaus respectively at 2.1 and at 4 V. Stable electrochemical capacity of 40 mAh/g for Li0.5FeV1.5O4 was found for 30 cycles. The electrochemical impedance spectroscopy study indicates smaller bulk resistance and higher ionic diffusion, i.e., less Warburg impedance for this phase. An energy density of 89 Wh/kg, a power density of 33 W/kg, and a 90% Coulombic efficiency was achieved with relatively good cyclic stability from Li0.5FeV1.5O4.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2034-9
Issue No: Vol. 23, No. 8 (2017)

• Low content Ni and Cr co-doped LiMn 2 O 4 with enhanced capacity retention
• Authors: Azhar Iqbal; Yousaf Iqbal; Abdul Majeed Khan; Safeer Ahmed
Pages: 1995 - 2003
Abstract: Abstract Nanoparticles of the pure and Ni–Cr co-doped lithium manganese oxides Li[NixCryMn2-x-y]O4 (x = y = 0.01–0.05) have been synthesized by sol–gel method using citric acid as a chelating agent. The effect of low-content doping was noted reflecting the faster ionic movement in the cathode material. The phase structure and morphology of the materials are characterized by XRD, FTIR, SEM and TEM. Electrochemical and impedance measurements established that low-content Ni–Cr substitution substantially improves the structural stability and high rate cycling performance of LiMn2O4. Among all the investigated compositions, LiNi0.01Cr0.01Mn1.98O4 demonstrated the best electrochemical performance. At a substantially high current rate of 5 C, 82% of the initial discharge capacity at 0.1 C is retained. Remarkably, after deep cycling at high rates, a discharge capacity of 104 mAhg−1 is resumed upon reducing the current rate to 0.1 C which is 91% of the specific capacity in the first cycle.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2062-5
Issue No: Vol. 23, No. 8 (2017)

• Charge transport in activated carbon electrodes: the behaviour of three
electrolytes vis-à-vis their specific conductance
• Authors: Pankaj; Madhav P. Chavhan; Somenath Ganguly
Pages: 2037 - 2044
Abstract: Abstract In this study, the electrochemical performances of different aqueous electrolytes (6 M KOH, 2 M KCl and 0.5 M K2SO4) in activated carbon electrodes are evaluated with regard to their use in electrochemical double layer capacitor (EDLC). The results from cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS) were analysed. The lowest value of equivalent series resistance (ESR) and the highest values of specific capacitance and coulombic efficiency were observed, when KOH was the electrolyte. The impedance spectroscopy plots were fitted to an equivalent circuit of ladder type to evaluate the resistances to ion transport at different levels of hierarchies in the pore network. Also, the quality of the double layer capacitance at lower hierarchy that primarily contributes to the overall capacitance of the device was evaluated from the leakage resistance in the equivalent circuit. The fitted circuit parameters were further reviewed vis-à-vis the specific conductance of chosen electrolyte, and the number of successive charge–discharge cycles prior to the EIS measurements.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2048-3
Issue No: Vol. 23, No. 8 (2017)

• Synthesis of plate-like Li 3 PS 4 solid electrolyte via liquid-phase
shaking for all-solid-state lithium batteries
• Authors: Nguyen Huu Huy Phuc; Kei Morikawa; Totani Mitsuhiro; Hiroyuki Muto; Atsunori Matsuda
Pages: 2061 - 2067
Abstract: Abstract The precursor of plate-like Li3PS4 solid electrolyte (75Li2S▪25P2S5, SE (LS)), about 3 μm in length, 500 nm in width, and 100–200 nm in thickness, was successfully prepared from Li2S and P2S5 using ethyl propionate (EP) as a synthetic medium via liquid-phase shaking. Upon evacuating at 170 °C, the precursor decomposed to SE (LS), which exhibited ionic conductivity of about 2.0 × 10−4 Scm−1 at room temperature. SEM observation revealed that the SE (LS) thus obtained had plate-like morphology with dimension of 3 μm in length, 500 nm in width, and 100–200 nm in thickness. Owing to the nanosized SE (LS), an all-solid-state half-cell using composite anode consisting of 90 wt% LiNi1/3Mn1/3Co1/3O2 (NMC) and 10 wt% SE (LS) delivered a high capacity up to 130 mAhg−1(NMC) at the first discharge.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2035-8
Issue No: Vol. 23, No. 8 (2017)

• Effects of electrolyte conductivity on power generation in
bio-electrochemical systems
• Authors: Yuan Gu; Huajun Feng; Xianbin Ying; Kun Chen; Jiazheng Cheng; Haoqian Huang; Shuting Zhen; Dongsheng Shen
Pages: 2069 - 2075
Abstract: Abstract Bio-electrochemical systems (BESs) have recently attracted considerable attention as a promising technology for sustainable wastewater treatment. However, the practical applications of BESs remain limited partly because the conductivity of actual wastewater can vary from 0.2 to 40 ms/cm which is out of the appropriate range for power generation. Herein, we investigated the effect of anolyte and catholyte conductivities on power generation. The maximum current density (0.73 mA/cm2) was achieved by reactors using an anolyte solution with a conductivity of 14.93 ± 0.02 ms/cm; this was four times higher than the minimum current density (0.13 mA/cm2), obtained using a solution with a conductivity of 2.61 ± 0.04 ms/cm. Anolyte conductivity was found to be the primary rate-limiting factor for power generation and had a greater effect than the conductivity of the catholyte. Furthermore, an anolyte conductivity range of 6.45–14.93 ms/cm was found to be most appropriate for superior BES performance.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2047-4
Issue No: Vol. 23, No. 8 (2017)

• Structural, thermal properties and chemical durability of aluminosilicate
glasses prepared by Bayer red mud
• Authors: Hongting Liu; Ya Qu; Yadong Lu; Ziyuan Chang; Yunlong Yue
Pages: 2091 - 2101
Abstract: Abstract Two series of glass which are based on the particularity of iron oxide in the Bayer red mud, dolomite, pyrophyllite, quartz powder, fluorite, and industrial Al2O3 were prepared. The structure, thermal properties, and chemical durability of the prepared glasses were investigated. X-ray diffraction patterns showed no peaks of crystallization. Result of Fourier transform infrared shows that the existence of ~992 cm−1 in SF series can be assigned to mixed anion structure of [TO4] (T = Si, Al) tetrahedra. For the AF series samples, the Si-O network gradually depolymerized as the decrease of Fe2O3 when the content of SiO2 remained unchanged. Differential scanning calorimetry analysis shows that, as the content of Si/Fe and Al/Fe increased, the glass-transition temperature of glass approximately showed an increase tendency. From the chemical durability experiment results, the presence of TiO2, Fe2O3, etc. in the Bayer red mud improved the resistance to chemical corrosion (especially in acid and alkali resistance) of the glasses, bringing about corrosion resistance close or be superior to that of E-glass and AR-glass, which can be applied in the preparation of aluminosilicate-based glass fiber.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2045-6
Issue No: Vol. 23, No. 8 (2017)

• Strengthen the performance of sulfonated poly(ether ether ketone) as
proton exchange membranes with phosphonic acid functionalized carbon
nanotubes
• Authors: Wen Zhang; Hui Zheng; Chengyi Zhang; Baochen Li; Feifei Fang; Yuxin Wang
Pages: 2103 - 2112
Abstract: Abstract Nanocomposite polymers based on phosphonic acid functionalized carbon nanotubes (CNT-POH) and sulfonated poly(ether ether ketone) (SPEEK) have been fabricated and employed as highly efficient proton exchange membranes. CNT-POH were synthesized through the grafting of carbon nanotubes (CNT) with diethylphosphatoethyl triethoxysilane and subsequent acidification of phosphate to phosphonic acid ligands. Incorporating CNT-POH into SPEEK matrix improves the proton conductivity at different temperatures and relative humidity, which can be attributed to the homogeneous dispersion of highly hydrophilic phosphonic acid groups and the formation of proton transport channels in the membrane. The methanol permeability of the composite membranes is also decreased, owing to the increased tortuosity of the methanol transport channel. The CNT in SPEEK matrix also enhance the dimensional stability and mechanical property remarkably. Consequently, this phosphonic acid functionalized CNT/SPEEK composite membrane (SPEEK-POH) is a potential candidate for application in direct methanol fuel cells (DMFC).
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2030-0
Issue No: Vol. 23, No. 8 (2017)

• Promising performances for a La 0.6 Sr 0.4 Co 0.8 Fe 0.2 O 3-δ cathode
with a dense interfacial layer at the electrode-electrolyte interface
• Authors: K. Dumaisnil; J.-C. Carru; D. Fasquelle; M. Mascot; A. Rolle; R.-N. Vannier
Pages: 2125 - 2132
Abstract: Abstract As for the commonly studied La0.6Sr0.4Co0.2Fe0.8O3-δ (6428), here, a very low area-specific resistance (ASR) was measured for La0.6Sr0.4Co0.8Fe0.2O3-δ (6482) cathode deposited on a Ce0.9Gd0.1O2-δ (GDC) electrolyte with addition of a thin (1 μm) dense LSCF film deposited by spin coating at the interface between the GDC electrolyte and a 40-μm-thick screen-printed electrode. The ASR ranged from 1 Ω.cm2 at 500 °C, 0.11 Ω.cm2 at 625 °C and value as low as 0.03 Ω.cm2 at 700 °C. Impedance spectra collected in between 500 and 700 °C were carefully studied. They could all be modelled with two R//CPE in series which are likely associated to the oxygen reduction reaction itself (dissociation/adsorption/ionization) at low frequency and to the oxide ion transfer at the electrode/electrolyte interface at high frequency.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2061-6
Issue No: Vol. 23, No. 8 (2017)

• Cross-linked sulfonated poly(arylene ether nitrile)s membranes based on
macromolecule cross-linker for direct methanol fuel cell application
• Authors: Jingchun Liu; Mengna Feng; Xiaobo Liu
Pages: 2133 - 2142
Abstract: Abstract A series of cross-linkable sulfonated poly(arylene ether nitrile)s (SPEN) membranes with different ratios of sulfonated poly(vinyl alcohol) (SPVA) have been prepared through thermal heating. This experiment had two advantages: expectant low methanol permeability and swelling ratio obtained after being cross-linked. Besides, the cross-linked membranes also exhibited excellent thermal stability than that of pure SPEN. Low swelling ratio and water uptake membranes had been obtained after being cross-linked. The methanol permeability showed a minimum value of 8.08 × 10−8 cm2 s−1 of SPEN-SPVA-40%, and the membrane also showed higher selectivity than Nafion 117. The result suggested that the SPEN-SPVA membranes are potential candidates as PEM in DMFCs.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2054-5
Issue No: Vol. 23, No. 8 (2017)

• SGO/SPEN-based highly selective polymer electrolyte membranes for direct
methanol fuel cells
• Authors: Tao Cheng; Mengna Feng; Yumin Huang; Xiaobo Liu
Pages: 2143 - 2152
Abstract: Abstract In this study, proton-exchange membranes (PEMs) consisting of sulfonated poly(arylene ether nitrile) (SPEN) have been successfully prepared by incorporating a different amount of sulfonated graphene oxide (SGO). Incorporation of SGO can improve proton conductivity and reduce the methanol permeability. Besides, the existence of the intermolecular interactions between SPEN and SGO can improve the interfacial compatibility between filler and matrix. The resulting composite membranes show better mechanical property, proton conductivity and lower methanol permeability compared to that of pure SPEN. Furthermore, the composite membrane with 1 wt% SGO possesses good interfacial compatibility, exhibiting excellent proton conductivity (0.109 S/cm at 20 °C and 0.265 S/cm at 80 °C) and low methanol permeability (0.17×10−6 cm2·s−1 at 20 °C). So it achieves the highest selectivity (6.412×105 S·s·cm−3), which is about 14 times higher than that of Nafion 117. All these data indicate that the SPEN/SGO composite membranes have good potential for applications in direct methanol fuel cells.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2057-2
Issue No: Vol. 23, No. 8 (2017)

• Impedance spectroscopy of cell with Pt electrodes on oxygen-conducting
material with mayenite-related structure
• Authors: S. N. Shkerin; A. S. Tolkacheva; A. V. Nikonov; N. B. Pavzderin
Pages: 2153 - 2160
Abstract: Abstract Ceramic Ca11.93(Al13.53V0.07)O33-x was investigated by impedance spectroscopy using two- and four-probe configurations. Cells with non-impregnated and Pr-impregnated Pt electrodes were studied. Properties of both the ceramic and electrode O2,Pt/O2− systems were distinguished. The existence of a surface layer is proposed as an explanation of the discrepancy between the reported conductivity data of single crystal mayenite as measured by four- and two-probe techniques.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2043-8
Issue No: Vol. 23, No. 8 (2017)

• NiO/C enhanced by noble metal (Pt, Pd, Au) as high-efficient
electrocatalyst for oxygen evolution reaction in water oxidation to obtain
high purity hydrogen
• Authors: Shang-Qing Wang; Wei-Yan Xia; Zhi-Shan Liang; Zi-Li Liu; Chang-Wei Xu; Qing-Yu Li
Pages: 2161 - 2166
Abstract: Abstract Carbon black is used as conducting support for NiO nanoparticles, and noble metal particles are well dispersed on NiO/C with an average diameter of 4–8 nm. Benefiting synergistic effect, NiO/C by adding noble metal exhibits superior electrochemical activity and excellent stability for oxygen evolution reaction in water splitting. A catalyst with a weight ratio of Au to NiO of 1:2 gives the best performance. Onset potential on the Au-NiO(wt 1:2)/C electrode shifts more negatively than that on Pt-NiO(wt 1:2)/C and Pd-NiO(wt 1:2)/C, and onset potential on the Au-NiO(wt 1:2)/C electrode is lower than that on the other electrodes.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2041-x
Issue No: Vol. 23, No. 8 (2017)

• Improvement of the Ir/IrO 2 pH electrode via hydrothermal treatment
• Authors: Dandan Wang; Chi Yang; Jinfeng Xia; Zhenhai Xue; Danyu Jiang; Guohong Zhou; Xiaohong Zheng; Huiping Zheng; Yuansheng Du; Qiang Li
Pages: 2167 - 2174
Abstract: Abstract Several Ir/IrO2 pH electrodes were prepared by a cyclic thermal oxidation process via dip-coating in a concentrated solution of NaOH. A hydrothermal hydration treatment at 220 °C for 24 h was used to address the problematic potential drift that is common in Ir/IrO2 pH electrodes. The electrodes that were treated by the hydrothermal method exhibited good stability and high sensitivity compared to those that were hydrated at room temperature. The reasons for this improvement were investigated by Raman spectroscopy, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy. The results suggested that the hydrothermally treated electrode had a more orderly crystal arrangement and a higher content of OH− groups, which drove improvements in the performance of electrode by modification of the Ir/IrO2 structure. The relationship between the electrode structure and performance was investigated and discussed in detail herein.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2058-1
Issue No: Vol. 23, No. 8 (2017)

• In situ synthesis of porous Co 3 O 4 polyhedra/carbon nanotubes
heterostructures for highly efficient supercapacitors
• Authors: Cheng Zhu; Miao Wang; Tianjun Li; Ting Lu; Likun Pan
Pages: 2175 - 2183
Abstract: Abstract Currently, supercapacitors (SCs) have been applied widely in energy storage field. In this work, porous Co3O4 polyhedra (PCP)/carbon nanotubes (CNTs) heterostructures were designed by in situ implanting CNTs into ZIF-67 with a subsequent pyrolysis process and used for SCs. Their morphology, structure, and electrochemical performance were characterized by field-emission scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, X-ray diffraction spectroscopy, nitrogen adsorption-desorption, thermogravimetry analysis, cyclic voltammogram, galvanostatic charge-discharge, and electrochemical impedence spectra. The results show that the specific capacitance and cycling stability of the PCP electrodes are both increased after CNTs doping. As the temperature is increased to 350 °C, the obtained porous PCP/CNTs heterostructure exhibits the maximum specific capacitance (592 F g−1 at 1 A g−1) with long-term stability due to its high specific surface area and good electrical conductivity. The PCP/CNTs electrode should be a promising candidate for highly efficient electrode materials of SCs.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2042-9
Issue No: Vol. 23, No. 8 (2017)

• Three-dimensional graphene nanosheets supported by NiO/Si-MCP as electrode
materials for high-performance supercapacitors
• Authors: Bairui Tao; Hui Shao; Jianbo Yu; Rui Miao; Zaishun Jin; Fang Liu; Paul K. Chu; Zhin-Bin Zhang; Fengjuan Miao
Pages: 2185 - 2191
Abstract: Abstract A three-dimensional (3D) graphene/NiO/Si-microchannel (MCP) composite electrode is synthesized by the conventional microelectronic machining process and electrochemical exfoliation technology for electrochemical capacitors. SEM, AFM, and Raman scattering are used to investigate the morphology and structure, and electrochemical characterization reveals that the 3D graphene/NiO/Si-MCP has a high specific capacitance of 833 Fg−1 at a current density of 5 Ag−1 in 6 mol L−1 KOH. Moreover, good cycling performance with 92% capacitance retention after 1000 cycles is observed indicating the novel electrode has large potential in high-performance supercapacitors.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2050-9
Issue No: Vol. 23, No. 8 (2017)

• A facile low-temperature synthesis of V 2 O 5 flakes for electrochemical
detection of hydrogen peroxide sensor
• Authors: Mani Sivakumar; Mani Sakthivel; Shen-Ming Chen; Vediyappan Veeramani; Wei-Lun Chen; G. Bharath; Rajesh Madhu; Nobuyoshi Miyamoto
Pages: 2193 - 2200
Abstract: Herein, we report a simple hydrothermal synthesized V2O5 flake employed as an electrode material for non-enzymatic hydrogen peroxide (H2O2) sensor application. The morphology, structural, and electrochemical properties of the as-prepared material were characterized by using various physicochemical and electrochemical methods viz. scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and amperometric (i-t). Moreover, an excellent electrochemical performance has been achieved by using the V2O5 flakes modified glassy carbon electrode (GCE) over the reduction of H2O2. In optimum experimental conditions, the reported electrochemical sensor was found with a wide linear range (0.1–408 μM), low detection limit (0.06 μM), and excellent sensitivity (9.87 μA μM−1 cm−2) with anticipated selectivity. Hence, the novel as-prepared V2O5-GCE provides a new avenue for the fabrication of amperometric H2O2 sensor with excellent real sample analysis. Graphical abstract V2O5 Flakes modified electrode for H2O2 sensor application
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2046-5
Issue No: Vol. 23, No. 8 (2017)

• Automatic potentiometric system for quantification of three imidazole
derivatives based on new polymeric PVC membrane sensors
• Authors: Ayman H. Kamel; Amina A. A. Argig
Pages: 2201 - 2211
Abstract: Abstract New potentiometric monitoring devices for trace and fast determination of three imidazole derivatives were presented. The sensing materials were fabricated by the inclusion of imidazolinium phosphomolybdate (Imd/PMA) (sensor I), imidazolinium tetraphenylborate (Imd/TPB) (sensor II), or dibenzo-24-crown-8 (DB24C8) (sensor III) in the plasticized polyvinyl chloride (PVC) matrix. The sensors showed clear enhanced response towards imidazolium [Imd+] ions over the concentration range 4.0 × 10−6–1 × 10−2 mol L−1 at pH 5 with 0.42 μg mL−1 as a detection limit. The selectivity was tested with various inorganic and nitrogenous organic ions. Long life span, fast response, long-term stability, and high reproducibility are shown for the sensors. Method validation for the proposed method was achieved by quantifying the detection limit, linear range, accuracy, precision, repeatability, and between-day variability. It revealed good performance characteristics of the proposed sensors. The applicability of the sensors for analyzing imidazole in urine samples was successfully demonstrated via recovery studies.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2029-6
Issue No: Vol. 23, No. 8 (2017)

• Fabrication of novel Ag/AgCl electrode pair on the template of carbon foam
as marine electric field sensor and its electrochemical performances
• Authors: Jingzhe Zai; Yubin Fu; Xuerong Zai; Hongwei Ji; Ang Liu; Fanggang Chai
Pages: 2213 - 2219
Abstract: Abstract A kind of novel Ag/AgCl electrode pair on the template of carbon foam is fabricated as electric field sensor for marine electric field test. The microstructure of AgCl layer and BET surface area are characterized and the electrochemical performances are tested, such as polarization resistance, stability of potential difference, signal response of electric field, and electrochemical self-noise. The results show the average diameter of AgCl grain is in the scale of 26 nm and the BET surface area of electrode is 1.40 m2/g. The polarization resistance is 21.17 Ω, meaning that the electrode has good anti-polarization property. The electrode pair has little potential difference drift (less than 0.02 mV/24 h) and excellent response property to low frequency electric field signal (1 mHz). Its electrochemical self-noise is about 1.60  $$\mathrm{nV}/\sqrt{\mathrm{Hz}}$$ @ 1 Hz. All these results indicate that this electrode pair can offer a promising electric field sensor for marine oil-gas resources prospection.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2055-4
Issue No: Vol. 23, No. 8 (2017)

• Correlation between the proton conductivity and diffusion coefficient of
sulfonic acid functionalized chitosan and Nafion composites via impedance
spectroscopy measurements
• Authors: I. Ressam; M. Lahcini; A. Belen Jorge; H. Perrot; O. Sel
Pages: 2221 - 2227
Abstract: Abstract Electrochemical Impedance Spectroscopy (EIS) was employed to estimate the global transverse proton diffusion coefficient, D H +, in sulfonic acid functionalized sustainable chitosan (CS-SO3H)/Nafion composite films. In contrast to conventional conductivity measurements, EIS measurements were performed at room temperature with a film/liquid interface. In this configuration, the measure of the bulk proton transport is correlated to the D H + of the membranes which is close to 1.1 × 10−6 cm2 s−1 and 0.33 × 10−6 cm2 s−1 with and without CS-SO3H, respectively. These D H + values permitted the proton conductivity (σ H +) ratio (∼3.9) between the Nafion/CS-SO3H composite and pristine Nafion films to be estimated by using the Nernst-Einstein relationship. This ratio presents a good agreement with that obtained for the σ H + of bulk membranes (∼3.2) measured at 30 °C and 90% RH. The agreement between the σ H + ratios validates our methodology for D H + estimation by EIS and suggests that the more than three times enhanced $${\sigma}_H^{+}$$ is governed by the ∼3 times higher D H + in the presence of CS-SO3H.
PubDate: 2017-08-01
DOI: 10.1007/s11581-017-2151-5
Issue No: Vol. 23, No. 8 (2017)

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