Abstract
ABSTRACT
The hydrogen evolution reaction (HER) is of great importance for the renewable energy conversion to hydrogen fuel via water electrolysis. However, the current benchmark Pt/C catalyst suffers from high cost, pH sensitivity, and deficient durability, severely restricting the large‐scale development of membrane water electrolysis. Herein, we develop a cost‐effective Pt‐free catalyst featuring high‐density, ultrafine Ru nanoclusters modified with CoP and uniformly dispersed on nitrogen‐doped carbon films (NCF). This catalyst achieves not only superior HER activity across a wide pH range but also robust stability at ampere‐level large current densities, manifesting as a competitive alternative to commercial Pt/C. Typically, Ru‐CoP/NCF exhibits an overpotential of only 22 mV at 10 mA cm
−2
in acidic media, with the mass activity and price activity 1.21 and 2.18 times higher than Pt/C, respectively. A proton exchange membrane water electrolyzer using Ru‐CoP/NCF catalyst delivers a high current density of 1.0 A cm
−2
at a voltage of merely 1.67 V and sustains long‐term operation for 780 h with a minimal decay rate of 84 µV h
−1
. This Ru‐CoP/NCF catalyst thus demonstrates practical potential for the development of non‐Pt membrane electrodes.