Using an interface engineering strategy,we successfully synthesized a core-shell nano-flower array of CuCo2O4/NiFe-layered bimetallic hydroxide(LDH)on nickel foam(NF)(CuCo2O4/NiFe-LDH@NF).The research indicates that electrons undergo transfer across the coupled interface of CuCo2O4 and NiFe-LDH,resulting in the enrichment of the CuCo2O4 core in electron density and thereby enhancing reaction kinetics.The amorphous NiFe-LDH shell not only provides additional channels for electron/material transport and increases active sites but also effectively shields the core CuCo2O4 from strong alkali corrosion during the oxygen evolution reaction(OER)in elec-trocatalysis.Therefore,when employed as an OER catalyst in a 1.0 mol·L-1 KOH solution,CuCo2O4/NiFe-LDH@NF required only a low overpotential of 191 mV to achieve a current density of 10 mA·cm-2 and a low Tafel slope of 31 mV·dec-1.Furthermore,CuCo2O4/NiFe-LDH@NF demonstrated stability in catalytic performance,crystal structure,morphological structure,and composition during prolonged operation.
interfacial engineeringtransition metal oxidenickel-iron hydroxideoxygen evolution reactioncore-shell structure
NETL
NSTL
万方数据
