Ru触媒の微小環境を制御し高効率アルカリ性水素酸化反応を実現（Researchers Regulate Local Microenvironment of Ru Catalyst to Achieve Efficient Alkaline Hydrogen Oxidation Reaction）

2025-04-29 中国科学院（CAS）

Theoretical calculation and modeling of the surface electronic structure of Ru catalysts and their HOR performance. (Image by ZHENG Fangcai)

＜関連情報＞

• https://english.cas.cn/newsroom/research_news/phys/202504/t20250429_1042309.shtml
• https://pubs.acs.org/doi/10.1021/acs.nanolett.4c06285

効率的なアルカリ水素酸化のための局所的な界面電子を最適化した格子閉じ込めルテニウム電極触媒 Lattice-Confined Ru Electrocatalysts with Optimal Localized Interfacial Electrons for Efficient Alkaline Hydrogen Oxidation

Xiaojuan Zhang,Zhiyuan Xia,Zhiqiang Li,Lingzhi Wei,Qiquan Luo,Fangcai Zheng,and Hui Wang
Nano Letters  Published: March 6, 2025
DOI:https://doi.org/10.1021/acs.nanolett.4c06285

Abstract

The interfacial electronic structure has a significant influence on the electrocatalytic activity and durability of metal oxide-supported ruthenium (Ru) electrocatalysts for the alkaline hydrogen oxidation reaction (HOR). Herein, we optimize the interfacial electronic structure by tuning the Ru–O bonds within MnO lattice-confined Ru electrocatalysts, creating efficient and stable sites for alkaline HOR. The formed Ru–O bonds generate localized interfacial electrons and a downshifted d-band center of interfacial Ru atoms, which results in optimal adsorption ability of H* and OH* together with the reduced energy barrier of H₂O formation. The mass activity achieves 1.26 mA μg_Ru^–1 in 0.1 M KOH, which is 13.0-fold and 8.0-fold higher than that of the contrast Ru/C (0.097 mA μg_Ru^–1) and commercial Pt/C (0.158 mA μg_Pt^–1), respectively, while also exhibiting favorable durability and CO tolerance. This work highlights the rational design of Ru–O bonds in optimizing the interfacial electronic structure to enhance the alkaline HOR activity.