Manipulating the Dynamic Self-Reconstruction of CoP Electrocatalyst Driven by Charge Transport and Ion Leaching.

Surface reconstruction of electrocatalysts is very important to clarify the structure-component-activity relationship. In this work, in situ Raman and ex situ technologies are used to capture the surface structure evolution of F-Fe-CoP during the oxygen evolution reaction (OER). The results reveal that the leaching of F accelerates the dynamic reconstruction response of CoP to rapidly convert into active (oxy)hydroxide species. The further introduction of Fe can accelerate the charge transfer rate and alleviate the structural stacking caused by insufficient kinetics. The introduction of F and Fe increases the electron occupation states of cobalt sites and promotes the adsorption of OH - ions on the CoP catalyst, which significantly improves the OER performance. F-Fe-CoP exhibits excellent OER performance with an overpotential of 259 mV at 20 mA cm -2 . This finding enriches the OER mechanism associated with the surface reconstruction of CoP and provides a reference for the rational design of efficient electrocatalysts.