Chemical Energy‐Driven Lithiation Preparation of Co@Mo Core–Shell Heterostructures for Highly Efficient Hydrogen Evolution

作者：Di Han, Gaohui Du, Yunting Wang, Shaochen Wei, Jingyi Jing, Shixian Chen, Wenqi Zhao, Qingmei Su, Taotao Qiang, Bingshe Xu · 发表于：Small · 年份：2025 · DOI：10.1002/smll.202504705 · 被引用次数：9 · 研究领域：Electrocatalysts for Energy Conversion、Advanced battery technologies research、Advancements in Battery Materials

Abstract Developing efficient transition metal‐based catalysts through interface and defect engineering is crucial for enhancing hydrogen production via water electrolysis at high current densities, though it remains a significant challenge. In this study, Co@Mo heterostructures are designed and synthesized using a chemical‐energy‐driven lithiation (CEDL) process on Co 9 S 8 @MoS 2 . By taking advantage of the slow crystallization kinetics at room temperature, the original core–shell structure is preserved during the lithiation of Co 9 S 8 @MoS 2 heterostructures. Additionally, the electronic structure and adsorption‐free energy are tuned as a result of the slow lithiation, which helped create and maintain more surface and boundary defects. These Co@Mo heterostructures demonstrate outstanding performance in the hydrogen evolution reaction (HER) due to the benefits of the heterojunction and the presence of metal defects. Specifically, the Co@Mo catalyst exhibits high catalytic activity in 1 m KOH solution, requiring only 87 and 200 mV to reach current densities of 100 and 400 mA cm − 2 , respectively. This work provides a novel strategy for designing robust transition metal‐based hydrogen evolution catalysts with improved performance.