Making Ternary-Metal Hydroxysulfide Catalyst via Cathodic Reconstruction with Ion Regulation for Industrial-Level Hydrogen Generation

摘要

Deep insight into electrochemical reconstruction aids in the decoding ofelectrocatalytic mechanisms and the development of design principles foradvanced catalysts. Despite recent achievements, research concerningcathodic reconstruction is still lacking compared to the anodic variety. Thiswork captures the electroreductive reconstruction dynamics over bimetalNi–Mo sulfide by various in/ex situ techniques, and whereby cathodicreconstruction is steered with ion regulation to achieve a heterogeneousNi–Mo–Fe ternary metal hydroxysulfide (NMFSOH) as a robusthydrogen-evolving catalyst that is competent in industrial-level waterelectrolysis. The thermodynamically adaptive heterosynergism in the resultantNMFSOH catalyst can coordinate water dissociation and hydrogenation forthe alkaline hydrogen evolution reaction even at high current densities. Aflow-type alkaline water electrolyzer with dual NMFSOH electrodes affords anelectricity consumption of 3.99 kW h Nm~（?3） and an electricity-to-hydrogenefficiency of 88.7, manifesting its competitive cost-effectiveness towardpractical applications. This study showcases ion-regulatory reconstruction asan effective strategy to construct high-performance electrocatalysts.