Creep behavior of the solid acid fuel cell material CsHSO4
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2016 Elsevier Ltd Solid acid materials have recently shown great promise as solid-state electrolytes in intermediate temperature fuel cells. However, little is currently known about their mechanical properties, some of which could severely limit their application. In this study, the steady state creep behavior of the prototypical solid acid, CsHSO4, is characterized. In its highly conductive superprotonic state (>141C), the material creeps at very high rates, as high as 102s1, at stresses in the application design range of only a few MPa. The steady state creep stress exponent n3.6 and activation energy Q1.02eV=98.8kJ/mol are consistent with a dislocation-based creep mechanism.