The use SrIrO3 as oxygen evolution reaction (OER) catalysts have been demonstrated to have higher efficiency than gold-standard IrO2 in acidic conditions. It was hypothesized in theory that Sr atoms are leached out from a recent report using SrIrO3 thin film in 0.5 M H2SO4 electrolyte. However, no direct experimental evidence has been reported and the mechanism is unclear. Recently, we studied the electrochemical performance of SrIrO3-based perovskite and double-perovskite oxides to demonstrate their stability and high activity. In addition, using a combination of X-ray scattering and spectroscopy as well as density functional theory, we not only provided experimental evidences of the structural and composition changes of such catalysts, but also shed the lights on the understanding of the mechanism that leads to its stability and activity. These results can provide some guidance for further development of high efficient catalysts for OER in harsh environments.

Insights into SrIrO3-based perovskite oxides as highly efficient oxygen evolution reaction catalysts in acidic electrolytes

256th National Meeting (2018)

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