Research Progress of Non‐Noble Metal‐Based Self‐Supporting Electrode for Hydrogen Evolution Reaction at High Current Density

Abstract Electrocatalytic water splitting has emerged as a key method for large‐scale production of green hydrogen. Constructing efficient, durable, and low‐cost electrocatalysts for the hydrogen evolution reaction at high current densities is prerequisite for practical industrial applications of water splitting. Recently, non‐noble metal‐based self‐supporting electrodes have been explored for high current density applications due to their cost‐effective, high conductivity of metal substrate, robust interfacial binding between catalyst and metal substrate, and strong mechanical stability. In this review, the recently reported non‐noble metal‐based (Ni, Fe, Cu, Co, Ti, Mo, and alloy) self‐supporting electrode applied at high current densities are comprehensively summarized, classified, and discussed. Five fundamental design principles such as high intrinsic activity, abundant active sites, fast electron transfer, fast mass transport, and strong mechanical stability are proposed and discussed to achieve high‐performance electrocatalysts under high current densities. Furthermore, various modification strategies including heteroatom doping, morphology engineering, interface engineering, phase engineering, and strain engineering are discussed to enhance catalytic activity and durability of metal‐based self‐supporting electrode. Finally, the challenges and prospects for designing efficient and stable electrodes at high current densities in the future are discussed. This comprehensive overview will provide valuable insight and guidance for the development of green hydrogen production.