Fast proton conduction in inorganic ion-exchange compounds

England, William A.; Cross, M. G.; Hamnett, A.; Wiseman, Philip J.; Goodenough, John B.

doi:10.1016/0167-2738(80)90007-7

Cited by 228 publications

(102 citation statements)

References 8 publications

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“…To evaluate the effect of the functionalization on the surface acidity of the tin oxide, IEC values of both oxide powders were measured and they were found to be 0.352 meq g -1 and 1.42 meq g -1 , for SnO 2 ·nH 2 O and S-SnO 2 , respectively. These values are in good agreement with ion-exchange capacity of metal oxides including hydrated tin oxide [40][41][42]. The increased IEC of the sulfated sample revealed the enhanced acidity of S-SnO 2 with respect to SnO 2 ·nH 2 O provided by the surface functionalization of the filler.…”

Section: Conductivitysupporting

confidence: 75%

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

et al. 2010

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Wiley-VCH AbstractNafion composite membranes containing either hydrated tin oxide (SnO 2 ·nH 2 O) or sulfated tin oxide (SSnO 2 ) at 5 wt.% and 10 wt.% were prepared and characterized. The structural and electrochemical features of the samples were investigated using X-ray diffraction, electrochemical impedance spectroscopy, methanol crossover, and direct methanol fuel cell (DMFC) tests. Highest conductivity values were obtained by using S-SnO 2 as filler (0.094 Scm -1 at T=110°C and RH=100%). The presence of the inorganic compound resulted in lower methanol crossover and improved DMFC performance with respect to a reference unfilled membrane. To improve the interface of the membrane electrode assembly (MEA), a layer of the composite electrolyte (i.e., the Nafion membrane containing 5 wt% S-SnO 2 ) was brushed on the electrodes, obtaining a DMFC operating at 110°C with a power density (PD) of 100 mWcm -2 which corresponds to a PD improvement of 52% with respect to the unfilled Nafion membrane.

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Section: Conductivitysupporting

confidence: 75%

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

et al. 2010

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“…These parameters vary with pH and extent of desiccation. England et al [23] passed a solution of KSb(OH) 6 in boiling water through an ion exchange column in the H + form and obtained HSbO 3 ؒ2H 2 O by aging the solution at 80 °C for 4 days. Its structure was solved with H 2 O and H 3 O + occupying sites 16d and 8b (50 and 100 % occupied, respectively) in the archetypal perovskite lattice.…”

Section: Solution Geochemistrymentioning

confidence: 99%

Dispersion of antimony from oxidizing ore deposits

Diemar

Filella

Leverett

et al. 2009

Pure and Applied Chemistry

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, at 25 °C in 0.100 mol dm -3 aqueous HNO 3 was also investigated. Equilibrium dissolved Sb concentrations were 3.3 ± 1.0 × 10 -7 and 7.7 ± 2.1 × 10 -8 mol dm -3 , respectively. These values have been used to re-evaluate the geochemical mobility of Sb in the supergene environment. It is concluded that the element is geochemically immobile in solution and in soils. This was in part validated by an orientation soil geochemical survey over the Bayley Park prospect near Armidale, New South Wales, Australia. Anomalous soil Sb levels are confined to within 100 m of known stibnite mineralization.

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“…observed was 2.0045 and the peak-to-peak linewidth (∆B) was 8.3 G. In the CAA/PANI-1, the values were g = 2.0048 and ∆B = 2.9 G. Figure 5-a shows the X-ray pattern of CAA. It is typical of a cubic pyrochlore-like structure 28 and shows that the solid is well crystallized. The XRD patterns of both CAA/ PPy and CAA/PANI-1 hybrids, shown in Figures 5-b and 5-c, respectively, do not exhibit marked differences with respect to pure CAA pattern.…”

Section: Resultsmentioning

confidence: 99%

“…This inorganic material represented by H 2 Sb 2 O 6 .nH 2 O shows protonexchange reactions, exhibits high protonic conductivities and negligible electronic conductivity 26,27 . It has a pyrochlore-like structure, with a characteristic structural feature formed by a [Sb 2 O 6 2-] n three-dimensional framework built up from infinite chains of corner-shared SbO 6 octahedra 28 . Water molecules and acidic protons occupy the interconnected interstitial cavities within the framework 28 .…”

Section: Introductionmentioning

confidence: 99%

“…It has a pyrochlore-like structure, with a characteristic structural feature formed by a [Sb 2 O 6 2-] n three-dimensional framework built up from infinite chains of corner-shared SbO 6 octahedra 28 . Water molecules and acidic protons occupy the interconnected interstitial cavities within the framework 28 . The CAA/conducting polymer hybrids obtained in this work can present mixed ionic and electronic conductivities (from CAA and conducting polymers, respectively).…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of organic-inorganic hybrids formed between conducting polymers and crystalline antimonic acid

Beleze¹,

Zarbin²

2001

J. Braz. Chem. Soc.

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Neste trabalho são relatadas e discutidas a síntese e a caracterização de dois materiais híbridos orgânico-inorgânico, formados entre o ácido antimônico cristalino (AAC), como fração inorgânica, e dois polímeros condutores (polipirrol e polianilina) como fração orgânica. Os híbridos foram obtidos a partir da polimerização oxidativa in situ dos monômeros, utilizando-se o próprio AAC como agente oxidante, a partir da redução dos átomos de Sb(V) presentes em sua estrutura. Os materiais foram caracterizados por espectroscopias infravermelho e Raman, voltametria cíclica, difratometria de raios-X, análise elementar CHN e espectroscopia de ressonância paramagnética eletrônica. Os resultados evidenciaram que ambos os polímeros foram formados em sua forma oxidada, com a própria estrutura do AAC atuando como contra-íon.In this paper we report the synthesis and characterization of novel organic-inorganic hybrid materials between the crystalline antimonic acid (CAA) and two conductive polymers: polypyrrole and polyaniline. The hybrids were obtained by in situ oxidative polymerization of monomers by the Sb(V) present in the pyrochlore-like CAA structure. The materials were characterized by infrared and Raman spectroscopy, X-ray diffraction, cyclic voltammetry, CHN elemental analysis and electronic paramagnetic resonance spectroscopy. The results showed that both polymers were formed in their oxidized form, with the CAA structure acting as a counter anion.

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Fast proton conduction in inorganic ion-exchange compounds

Cited by 228 publications

References 8 publications

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

Development of Nafion/Tin Oxide Composite MEA for DMFC Applications

Dispersion of antimony from oxidizing ore deposits

Synthesis and characterization of organic-inorganic hybrids formed between conducting polymers and crystalline antimonic acid

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