Yang Zhichao, Ding Yutian, Chen Wen, Luo Shuiping, Cao Daofan, Long Xin, Xie Lei, Zhou Xincheng, Cai Xinyi, Liu Ke, Fu Xian-Zhu, Luo Jing-Li
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, P. R China.
Shenzhen Key Laboratory of Energy Electrocatalytic Materials, Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518055, P. R. China.
Adv Mater. 2025 Mar;37(9):e2417777. doi: 10.1002/adma.202417777. Epub 2025 Jan 16.
Engineering nanomaterials at single-atomic sites can enable unprecedented catalytic properties for broad applications, yet it remains challenging to do so on RuO-based electrocatalysts for proton exchange membrane water electrolyzer (PEMWE). Herein, the rational design and construction of Bi-RuO single-atom alloy oxide (SAAO) are presented to boost acidic oxygen evolution reaction (OER), via phase engineering a novel hexagonal close packed (hcp) RuBi single-atom alloy. This Bi-RuO SAAO electrocatalyst exhibits a low overpotential of 192 mV and superb stability over 650 h at 10 mA cm, enabling a practical PEMWE that needs only 1.59 V to reach 1.0 A cm under industrial conditions. Operando differential electrochemical mass spectroscopy analysis, coupled with density functional theory studies, confirmed the adsorbate-evolving mechanism on Bi-RuO SAAO and that the incorporation of Bi improves the activity by electronic density optimization and the stability by hindering surface Ru demetallation. This work not only introduces a new strategy to fabricate high-performance electrocatalysts at atomic-level, but also demonstrates their potential use in industrial electrolyzers.
在单原子位点上设计工程纳米材料能够实现前所未有的催化性能，从而广泛应用于各个领域。然而，对于质子交换膜水电解槽（PEMWE）的基于RuO的电催化剂而言，实现这点仍具有挑战性。在此，我们通过对一种新型六方密堆积（hcp）RuBi单原子合金进行相工程，提出了Bi-RuO单原子合金氧化物（SAAO）的合理设计与构建方法，以促进酸性析氧反应（OER）。这种Bi-RuO SAAO电催化剂在10 mA cm²时表现出192 mV的低过电位以及超过650小时的卓越稳定性，从而实现了一种实用的PEMWE，在工业条件下仅需1.59 V就能达到1.0 A cm²。原位差分电化学质谱分析与密度泛函理论研究相结合，证实了Bi-RuO SAAO上的吸附质演化机制，并且Bi的掺入通过电子密度优化提高了活性，通过阻碍表面Ru脱金属提高了稳定性。这项工作不仅引入了一种在原子水平上制备高性能电催化剂的新策略，还展示了它们在工业电解槽中的潜在应用。
