Abstract
We demonstrate that oxygen electrocatalysts can be synchronously applied in acid oxygen evolution reaction (OER), alkaline OER and oxygen evolution reaction (ORR). The oxygen electrocatalyst (Y1.85Ba0.15Ru2O7) optimized by oxygen vacancy modulation presents an extraordinary catalytic activity and stability. Y1.85Ba0.15Ru2O7 catalyst presents an overpontential of 0.278 V in acid OER, which surpass most of the reported oxygen catalysts. Proton exchange membrane water electrolyzer (PEMWE) with Y1.85Ba0.15Ru2O7 anode attains 1.34 A cm-2 under a cell voltage of 1.7 V at 60 °C. Ba-doped Y2Ru2O7 shows an obvious advantage electrocatalytic activity than undoped Y2Ru2O7 in both OER and ORR process. This work paves a new avenue for developing active and robust oxygen electrocatalysts for both PEMWE and zinc-air battery applications.
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