Yang Chaoyi, Dai Zihao, Yue Jianchao, Luo Wei
College of Chemistry and Molecular Sciences, Wuhan University Wuhan Hubei 430072 P. R. China
Chem Sci. 2025 Jul 10. doi: 10.1039/d5sc03850b.
Although Ru has been regarded as the key candidate to replace Pt in alkaline hydrogen oxidation reaction (HOR), the substandard stability owing to its easy oxidation seriously impacts its practical application. In this work, we report the construction of a Ru-RuSb heterostructure, showing excellent performance and stability towards alkaline HOR. Owing to the difference in the work functions of Ru and RuSb, the charge transfer induced by the build-in electric field modifies the electron distribution on the surface, enhancing the OH adsorption on the heterostructure. Moreover, the connectivity of the hydrogen bonding network is promoted with the inducing of OH species, which thereby leads to elevated proton transfer and accelerated HOR process, presenting a mass activity ( ) of 2.098 mA μg at 50 mV, which is 6-fold and 20-fold higher than those of Pt/C and Ru/NC, respectively. Owing to the change of the OH adsorption sites on Sb and the rapid HOR process on the surface, the pace of the oxidation on Ru of the heterostructure during the reaction largely slows down, contributing to the outstanding stability with only 2.59% decline in the activity.
尽管钌（Ru）被视为在碱性氢氧化反应（HOR）中替代铂（Pt）的关键候选材料，但其因易氧化导致的稳定性欠佳严重影响了其实际应用。在本工作中，我们报道了一种Ru-RuSb异质结构的构建，该结构对碱性HOR表现出优异的性能和稳定性。由于Ru和RuSb功函数的差异，内建电场引起的电荷转移改变了表面的电子分布，增强了异质结构上的OH吸附。此外，OH物种的诱导促进了氢键网络的连通性，从而导致质子转移增加和HOR过程加速，在50 mV时呈现出2.098 mA μg的质量活性，分别比Pt/C和Ru/NC高6倍和20倍。由于Sb上OH吸附位点的变化以及表面快速的HOR过程，反应过程中异质结构上Ru的氧化速度大幅减慢，使其具有出色的稳定性，活性仅下降2.59%。
