Abstract
We have explored bimetallic Ru-M oxygen evolution reaction (OER) electrocatalysts for use in water splitting in acidic electrolytes. Using an electrochemical multielectrode cell, we investigated the OER activity of selected compositions of seven binary alloy systems, Ru-M (M = Pd, Ir, Cu, Co, Re, Cr, Ni). Benchmarked using pure Ru electrocatalysts, Ru-Co, Ru-Ir, and Ru-Cu exhibited improved Ru mass-based catalytic activities. Structural studies of the precursor alloys indicated the presence of hexagonal and cubic mixed metal phases. We hypothesize that the secondary metal component modulates the chemisorption energy of oxygen, which was suggested to be a sensitive rate controlling parameter in the OER catalysis and favors the formation of atomic oxygen O ad and possibly HOO ad species rather than OH ad species on the oxide catalyst.
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