Hierarchical Crystalline/Amorphous Heterostructure MoNi/NiMoO<sub>x</sub> for Electrochemical Hydrogen Evolution with Industry‐Level Activity and Stability
Xiaoyun Shi, Xiaozhong Zheng, Hao Wang, Hao Zhang, Minkai Qin, Binbin Lin, Menghui Qi, Shanjun Mao, Honghui Ning, Rui Yang, Lingling Xi, Yong Wang
Abstract
Abstract The design of cheap, efficient, and durable electrocatalysts for high‐throughput H 2 production is critical to give impetus to hydrogen production from fundamental to practical industrial applications. Here, a hierarchical heterostructure hydrogen evolution reaction (HER) electrocatalyst (MoNi/NiMoO x ) with 0D MoNi nanoalloys nanoparticles embedded on well‐assembled 1D porous NiMoO x microrods in situ grown on 3D nickel foam (NF) is successfully constructed. The synergetic effect of different building units in the unique hierarchical structure endows the MoNi/NiMoO x composites with the highly active heterogeneous interface with low water dissociation energy (Δ G diss = −1.2 eV) and optimized hydrogen adsorption ability (Δ G H* = −0.01 eV), fast electron/mass transport, and strong catalyst‐support binding force. As a result, optimal MoNi/NiMoO x exhibits an ampere‐level current density of 1.9 A cm −2 at an ultralow overpotential of 139 mV in 1.0 м KOH and 289 mV in 1.0 м PBS solution, respectively. Particularly, scaled‐up MoNi/NiMoO x electrodes in a 10 × 10 cm 2 membrane electrode assembly (MEA) electrolyzer reach a high H 2 production rate of 12.12 L h −1 (12.12 times than that of commercial NF) and exhibit ultralong stability of 1600 h, verifying its huge potential for industrial hydrogen production.