Heterointerface‐Rich Ni<sub>3</sub>N/WO<sub>3</sub> Hierarchical Nanoarrays for Efficient Glycerol Oxidation‐Assisted Alkaline Hydrogen Evolution
Hongjing Wang, Wenjie Zhan, Shaojian Jiang, Kai Deng, Ziqiang Wang, You Xu, Hongjie Yu, Hongjie Yu, Liang Wang, Liang Wang
Abstract
Abstract Glycerol oxidation‐assisted water electrolysis has emerged as a cost‐effective way of co‐producing green hydrogen and HCOOH. Still, preparing highly selective and stable nickel‐based metal electrocatalysts remains a challenge. Herein, heterostructure Ni 3 N/WO 3 nanosheet arrays of bifunctional catalysts with large specific surface areas loaded on nickel foam (denoted as Ni 3 N/WO 3 /NF) were synthesized. This catalyst was for glycerol oxidation reaction (GOR) and hydrogen evolution reaction (HER) with excellent catalytic performance, a voltage saving of 267 mV compared to oxygen evolution reaction (OER), and a HER overpotential of 104 mV at 100 mA cm −2 . The cell voltage in the assembled GOR//HER hybrid electrolysis system reaches 100 mA cm −2 at 1.50 V, 296 mV lower than the potential required for overall water splitting. This work demonstrates that replacing GOR with OER using a cost‐effective and highly active Ni‐based bifunctional electrocatalyst can make hybrid water electrolysis an energy‐efficient, sustainable, and green strategy for hydrogen production.