Engineering Li-ion Embedded into NiFe-LDHs Lattice Activate Laminate Ni2+ Sites as High Efficiency Oxygen Evolution Reaction Catalysts
Abstract
NiFe-LDHs have been deemed as a benchmark non-noble metal electrocatalysts for oxygen evolution reaction (OER). However, for NiFe-LDHs laminate, the edge sites are active, but the basal plane is inert, leading to underutilization for the OER catalysts. Herein, it is the first time to intercalate the light and electron-deficient Li ion into NiFe-LDHs basal plane. The results of theoretical calculation and experiment both showed that the electron would transfer from near Ni 2+ to the surrounding of Li + , resulting in the electron-deficient properties of Ni site would work as "electron-hungry" sites to enhance surface adsorption of electron-rich oxygen-containing group, which would benefit to enhance the effective active for OER. Demonstrated with catalytic performance, the Li-NiFe-LDHs electrodes showed ultralow overpotential only 298 mV at 50 mA cm -2 , which was lower than that of 347 mV for initial NiFe-LDHs, and also lower than that of 373 mV for RuO 2 . The reasonable intercalation adjustment effectively activate laminate Ni 2+ sites and constructs the electron-deficiency structure to enhance its electrocatalytic activity, which sheds light on the development for functional treatment of catalytic materials.
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