Conductivity and Transport Properties of Aqueous Phosphotungstic and Silicotungstic Acid Electrolytes for Room-Temperature Fuel Cells
作者： Ales Horky , Nazir P. Kherani , Gu Xu
DOI: 10.1149/1.1597884
关键词:
摘要: Conductivity measurements were performed on phosphotungstic and silicotungstic aqueous electrolyte solutions. The conductivity obtained from complex impedance plots had non-Arrhenius dependence temperature could be fit by the Vogel-Tamman-Fulcher expression, T 1/2 exp[Q c /(T-T o )]. Conductivities reached 0.257 0.32 S cm -1 at 298 K for 60 wt % solutions, respectively. Low concentration solutions obeyed Kohlrausch relation allowing determination of infinite dilution molar conductivity, 1637 2 mol , with anionic species [SiW 12 O 40 ] 4- having a 237 . diffusion coefficient 303 was 4.8 × 10 -6 s hydrodynamic radius 5.78 A. Analysis charge transference numbers indicated that predominantly protonic, suitable room-temperature fuel cells.
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sci-hub.se 参考文章(31)
B. Keita, L. Nadjo, Surface modifications with heteropoly and isopoly oxometalates Journal of Electroanalytical Chemistry and Interfacial Electrochemistry. ,vol. 243, pp. 87- 103 ,(1988) , 10.1016/0022-0728(88)85031-9
Michael Thor Pope, Heteropoly and isopoly oxometalates Inorganic chemistry concepts. ,vol. 8, ,(1983) , 10.1007/978-3-662-12004-0
D. R. Crow, Principles and Applications of Electrochemistry ,(1979)
A Hardwick, Investigation of H+ motion in the 21-hydrates of 12-tungstophosphoric and 12-molybdophosphoric acids by ac conductivity and pulsed 1H NMR measurements Solid State Ionics. ,vol. 13, pp. 345- 350 ,(1984) , 10.1016/0167-2738(84)90078-X
C. S. Zaluski, G. Xu, AC Impedance and Conductivity Study of Alkali Salt Form Perfluorosulfonate Ionomer Membranes Journal of The Electrochemical Society. ,vol. 141, pp. 448- 451 ,(1994) , 10.1149/1.2054747
Osamu Nakamura, Teruo Kodama, Isao Ogino, Yoshizo Miyake, High-conductivity solid proton conductors: Dodecamolybdophosphoric acid and dodecatungstophosphoric acid crystals. Chemistry Letters. ,vol. 8, pp. 17- 18 ,(1979) , 10.1246/CL.1979.17
P STAITI, Z POLTARZEWSKI, V ALDERUCCI, G MAGGIO, N GIORDANO, Solid polymer electrolyte fuel cell (SPEFC) research and development at the institute CNR-TAE of messina International Journal of Hydrogen Energy. ,vol. 19, pp. 523- 527 ,(1994) , 10.1016/0360-3199(94)90007-8
I.V. Kozhevnikov, K.I. Matveev, Homogeneous catalysts based on heteropoly acids (review) Applied Catalysis. ,vol. 5, pp. 135- 150 ,(1983) , 10.1016/0166-9834(83)80128-6
U. Mioč, Ph. Colomban, A. Novak, Infrared and Raman study of some heteropolyacid hydrates Journal of Molecular Structure. ,vol. 218, pp. 123- 128 ,(1990) , 10.1016/0022-2860(90)80254-H
Gu Xu, Non-Arrhenius temperature dependence of conductivities in amorphous systems Philosophical Magazine Part B. ,vol. 68, pp. 285- 289 ,(1993) , 10.1080/01418639308226407