Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or...
Reexamination Certificate
2011-01-11
2011-01-11
Yuan, Dah-Wei D (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
C429S498000
Reexamination Certificate
active
07867658
ABSTRACT:
Disclosed are developments in high temperature fuel cells including ionic liquids with high temperature stability and the storage of inorganic acids as di-anion salts of low volatility. The formation of ionically conducting liquids of this type having conductivities of unprecedented magnitude for non-aqueous systems is described. The stability of the di-anion configuration is shown to play a role in the high performance of the non-corrosive proton-transfer ionic liquids as high temperature fuel cell electrolytes. Performance of simple H2(g) electrolyte/O2(g) fuel cells with the new electrolytes is described. Superior performance both at ambient temperature and temperatures up to and above 200° C. are achieved. Both neutral proton transfer salts and the acid salts with HSO−4anions, give good results, the bisulphate case being particularly good at low temperatures and very high temperatures. The performance of all electrolytes is improved by the addition of a small amount of involatile base of pKavalue intermediate between those of the acid and base that make the bulk electrolyte. The preferred case is the imidazole-doped ethylammonium hydrogensulfate which yields behavior superior in all respects to that of the industry standard phosphoric acid electrolyte.
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Angell C. Austen
Belieres Jean-Philippe
Xu Wu
Yoshizawa Masahiro
Arciero Adam A
Arizona Board of Regents for and on behalf of Arizona State Univ
Fish & Richardson P.C.
Yuan Dah-Wei D
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