Fe-Doped\nNiSe Porous Nanosheets as Bifunctional Electrocatalysts\nfor Efficient Overall Water Splitting

Abstract

It is urgent and meaningful to seek a facile method to\ndesign alternative\nelectrocatalysts for effective overall water splitting. In this work,\na facile one-step chemical bath deposition technique is employed to\nsynthesize Fe-doped NiSe porous nanosheets on the Ni foam substrate\n(Fe–NiSe@NF). The synthesized Fe–NiSe@NF catalyst merely\nrequires an overpotential of 195 and 110 mV to achieve 10 mA cm^–2 and maintain stability for 35 h for OER and HER,\nrespectively. When the Fe–NiSe@NF is simultaneously used as\nan anode and cathode, the current density reaches 10 mA cm^–2 at a low cell voltage of 1.52 V under alkaline conditions. The outstanding\nwater splitting performances of the Fe–NiSe@NF catalyst are\nattributed to the large electrochemical activity area of porous nanosheets,\nactive phases generated on catalyst surfaces, and bimetallic synergistic\neffects. This work is beneficial for the exploitation of reliable\nand effective electrocatalysts to promote overall water splitting.