Phase-Reconstruction of S-Doped (NiCo) 6 W 6 C for Efficient and Stable Oxygen Evolution Reaction Electrocatalysis

作者：Yang Liu, Ruiqi Yao, Li‐Bo Chen, Tianyi Dai, Xin‐Ying Sun, Shu‐Pei Zeng, Zhi-Lan Zhou, Ying Wang, Gao‐Feng Han, Tonghui Wang, Hang Shi, Xingyou Lang, Qing Jiang · 发表于：Nano Letters · 年份：2025 · DOI：10.1021/acs.nanolett.5c03691 · 被引用次数：5 · 研究领域：Electrocatalysts for Energy Conversion、Fuel Cells and Related Materials、Advanced battery technologies research

Developing highly active and stable nonprecious electrocatalysts toward sluggish alkaline oxygen evolution reaction (OER) is essential for large-scale green hydrogen production via electrochemical water splitting. Here we report phase and surface co-reconstruction of S-doped (NiCo) 6 W 6 C nanoparticles into (NiCo)C x with amorphous electroactive NiCoOOH layer for highly efficient alkaline OER by W dissolution and NiCo surface oxidation. The W dissolution results in the formation of Brønsted base WO 4 2– ions, which electrostatically accumulate around electrode to promote water dissociation into abundant OH* intermediates, in situ constructing a locally strong alkaline microenvironment to facilitate OH* adsorption on NiCoOOH sites and trigger lattice-oxygen oxidation path. As a result, the heterostructure electrode exhibits superior OER electrocatalysis with low Tafel slope of ∼35 mV dec –1 in 1 M KOH. It delivers high ampere-level current density of ∼1 A cm –2 at a low overpotential of 275 mV, and maintains extraordinary stability for over 1000 h.