▎ 摘　　要

It's important to develop an economical and efficient electrocatalyst for water splitting. Nitrogen-doped FeCoNiS nanoparticles are supported on N, S-co-doped vertical graphene (N-FeCoNiS/SVG) by one-step electrodeposition. The SEM and TEM results show that 30 -115 nm nanoparticles grow uniformly on SVG. The XRD results show that N-FeCoNiS/ SVG is a polycrystalline material. N-FeCoNiS/SVG exhibits excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) potentials of 44 mV and 138 mV (10 mA cm-2), respectively, in 1 M KOH. The Faraday efficiency of N-FeCoNiS/SVG for overall water splitting is about 97%. The electrocatalyst also shows excellent stability over 24 h. The XPS results illustrate that N-doping promotes the electron transfer between metal and heteroatom and effectively modulates the electronic structure of FeCoNiS. N -FeCoNiS/SVG has excellent electrocatalytic performance for water splitting. This work provides theoretical and technical support for the study of water splitting bifunctional electrocatalysts. (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.