Preparation and Performance of Mn-Doped Co3O4 Electrocatalysts for Oxygen Evolution Reaction
Hydrogen energy holds significant importance in alleviating energy crises and environmental pollution.The sluggish kinetics of the oxygen evolution reaction(OER)in electrochemical water splitting limits the rate of hydrogen production,thus the development of efficient OER catalysts is crucial to promote the rapid progress of the water splitting process.In catalyst selection,spinel oxides are considered as promising non-precious metal electrocatalysts due to their unique electronic structure and excellent OER performance.Atomic doping design is the most feasible strategy to enhance the OER performance of spinel oxides.Results demonstrate that the Mn-doped Co3O4 electrocatalyst synthesized via a one-step hydrothermal method,by introducing Mn atoms,constructs an oxygen-bridged Mn-O-Co coordination structure,thereby enhancing the OER catalytic performance of Mn-Co3O4 through synergistic coupling effects.The prepared Mn-Co3O4 exhibits efficient catalytic activity,with overpotentials of 270 and 335 mV at current densities of 10 and 100 mA·cm-2,respectively;moreover,Mn-Co3O4 demonstrates rapid kinetic performance with a Tafel slope as low as 74 mV·dec-1.Additionally,Mn-Co3O4 displays excellent stability,maintaining stability for up to 40 h at a current density of 10 mA·cm-2.This study provides insights for the development of efficient OER catalysts.
spinel oxideCo3O4Mn atom dopingone-step hydrothermal methodoxygen evolution reaction(OER)non-precious metal electrocatalystcatalytic performancestability
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