Bimetallic Doped RuO(2) with Manganese and Iron as Electrocatalysts for Favorable Oxygen Evolution Reaction Performance

[Image: see text] Synthesizing oxygen evolution reaction (OER) catalysts with enhanced activity by codoping has been proven to be a feasible approach for the efficient use of noble metals via renewing their basic intrinsic properties. In continuation of the research in codoping, we prepare a ruthenium-based bimetallic doped catalyst Mn(x)Fe(y)Ru(1–x–y)O(2) with an outstanding OER activity as compared to pure RuO(2), one of the state-of-the-art OER catalysts. The synthesized codoped RuO(2) with a Mn/Fe molar ratio of 1 reflected a Tafel slope of only 41 mV dec(–1), which is appreciably lower than 64 mV dec(–1) for pure RuO(2). The X-ray photoelectron spectroscopy (XPS) performed reveals that oxygen vacancy and manganese valency are the key factors of the OER activity for codoped catalysts.