Dong Liu, Xiaotian Wei, Jianxi Lu, Xin Wang, Kai Liu, Yaohai Cai, Yingwei Qi, Lei Wang, Haoqiang Ai, Zhenbo Wang
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引用次数: 0
Abstract
Direct seawater electrolysis is emerging as a promising renewable energy technology for large-scale hydrogen generation. The development of Os-Ni4Mo/MoO2 micropillar arrays with strong metal-support interaction (MSI) as a bifunctional electrocatalyst for seawater electrolysis is reported. The micropillar structure enhances electron and mass transfer, extending catalytic reaction steps and improving seawater electrolysis efficiency. Theoretical and experimental studies demonstrate that the strong MSI between Os and Ni4Mo/MoO2 optimizes the surface electronic structure of the catalyst, reducing the reaction barrier and thereby improving catalytic activity. Importantly, for the first time, a dual Cl− repelling layer is constructed by electrostatic force to safeguard active sites against Cl− attack during seawater oxidation. This includes a strong Os─Cl adsorption and an in situ-formed MoO42− layer. As a result, the Os-Ni4Mo/MoO2 catalyst exhibits an ultralow overpotential of 113 and 336 mV to reach 500 mA cm−2 for HER and OER in natural seawater from the South China Sea (without purification, with 1 m KOH added). Notably, it demonstrates superior stability, degrading only 0.37 µV h−1 after 2500 h of seawater oxidation, significantly surpassing the technical target of 1.0 µV h−1 set by the United States Department of Energy.
期刊介绍:
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.