The development path of superprotonic solid acid fuel cell (SAFC) from laboratory to technological realization is presented. Studies of acid sulfates and selenates have shown that solid acid compounds that show superprotonic behavior undergo a detrimental reaction with hydrogen. The high plasticity or ductility that emerges in the superprotonic state of CsH2PO 4 can be dealt by introducing 10 wt% SiO2 and forming a composite electrolyte. Using mechanically mixed, composite electrodes of Pt + CsH2PO4, pre-commercial SAFCs display degradation rates of tens of microvolts per hour in constant current operation over periods of several hundred hours. The temperatures at which SAFCs are operated, approximately 250°C, suggest a high degree of fuel stream impurity tolerance and suitability to operation on fuels that are more complex than hydrogen.
|Original language||English (US)|
|Number of pages||7|
|Journal||Electrochemical Society Interface|
|State||Published - Sep 1 2009|
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