Shen Zhao, Guoqiang Han, Chunyang Wang, Haowei Bian, Guangwen Xie*, Xin Liu*, Luhua Jiang *

College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P.R. China

*Corresponding authors. E-mail: xiegw@qust.edu.cn (G. Xie), liuxin@qust.edu.cn (X. Liu), luhuajiang@qust.edu.cn (L. Jiang)

Abstract：

Nickel iron bimetallic phosphide alloys are a promising electrocatalyst for oxygen evolution reaction (OER). In this work, a highly active Ni-Fe-P/Fe-Si heterojunction electrocatalyst for OER has been synthesized by one-step electrodeposition on iron plate. The synergism effect of Ni-Fe-P alloy and Fe-Si alloy particles after dealloying treatment promotes the construction of nanoflower-like heterogeneous structure with rich lattice defects and exposes a highly open multi-stage nanostructure surface. Furthermore, Si induced the localized electron redistribution optimizes catalytic performance by accelerating electron transfer. The optimal Ni-Fe-P/Fe-Si OER catalyst requires a much low overpotential of 209 mV at a current density of 10 mA cm^-2, and 270 mV at a current density of 200 mA cm^-2. The prepared Ni-Fe-P/Fe-Si electrode can maintain a current density of 10 mA cm^-2 within 24 hours, which shows significant electrochemical stability. This study provides a new prospect for the preparation of cost-effective heterogeneous catalysts.

https://doi.org/10.1016/j.ijhydene.2023.08.219