Metal Phosphates as Intermediate Temperature Proton Conducting Electrolytes

Yunjie Huang, Q.F. Li, Chao Pan, Tatiana Anfimova, Jens Oluf Jensen, Niels Bjerrum

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Abstract

A series of metal phosphates were synthesized and screened as potential proton conductor electrolytes for fuel cells and electrolysers operational at intermediate temperatures. Among the selected, niobium and bismuth phosphates exhibited a proton conductivity of 10-2 and 10-7 S cm-1, respectively, under the anhydrous atmosphere at 250 °C, showing close correlation with the presence of hydroxyl groups in the phosphate phases. At the water partial pressure of above 0.6 atm, both phosphates possessed a proton conductivity to a level of above 3 x 10-2 S cm-1. Reasonable stability of the proton conductivity was observed under either a constant low water partial pressure or under a humidity cycling test within a period of more than 80 hours.

Original languageEnglish
JournalE C S Transactions
Volume45
Issue number1
Pages (from-to)99-104
ISSN1938-5862
DOIs
Publication statusPublished - 2012
Event221st ECS Meeting - Seattle, WA, United States
Duration: 6 May 201210 May 2012

Conference

Conference221st ECS Meeting
CountryUnited States
CitySeattle, WA
Period06/05/201210/05/2012

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