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The incorporation of Ce into Co-Mn oxides induced the charge redistribution of Co and Mn via electronic coupling, which facilitated the Co3+/Co4+ transition. Thus, the overpotential at 10 mA cm−2 was reduced significantly by 73 mV for the oxygen evolution reaction after Ce doping.

Graphical abstract: Ce-induced regulation of electron density enhanced the catalytic activity of Co-Mn oxides for water oxidation

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