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Abstract:
Developing highly active and stable catalysts for the oxygen evolution reaction (OER) is of significant importance for numerous electrochemical energy conversion devices. Previous accomplishments have shown that LiCoPO4 is a promising catalyst for OER activity; however, its activity and stability at high potential still need improvement to meet the requirements of practical applications, and further studies are needed for its catalytic mechanism. Here, we report a series of Fe-doped LiCoPO4 materials that exhibit excellent OER catalytic behaviors at high potential and elucidate their catalytic mechanism. Fe-doping enhances the OER activity through synergistic coupling effects, which is strongly influenced by the divalent Co2+ and Fe2+ cations rather than the trivalent Co3+ and Fe3+ cations. The possible rate-determining step is proposed to be the formation of *OOH derived from *O based on the H/D kinetic isotopic effect experiment.
