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.
|Journal||E C S Transactions|
|Publication status||Published - 2012|
|Event||221st ECS Meeting - Seattle, WA, United States|
Duration: 6 May 2012 → 10 May 2012
|Conference||221st ECS Meeting|
|Period||06/05/2012 → 10/05/2012|