近日，中国科学技术大学刘庆华团队报道了双钴掺杂的RuO₂/TiO₂电催化剂为PEM水电解提供稳定和经济的酸性析氧。相关论文于2025年9月24日发表在《美国化学会志》上。

开发高效、经济、耐用的质子交换膜电解（PEMWE）电催化剂仍然是一个重大挑战，需要在恶劣条件下稳定和提高催化剂的活性。

研究组在TiO₂上掺杂钴二氧化钌（Co_0.3Ru_0.7O₂）作为酸性析氧反应的电催化剂。Co_0.3Ru_0.7O₂-TiO₂在1 A cm^-2下获得了令人印象深刻的322 mV过电位，并在500 mA cm^-2下在PEMWE器件中稳定运行超过1000小时。综合实验和理论计算结果表明，在金红石RuO₂晶格中掺杂Co原子可以优化其几何构型。

此外，在氧化条件下，Co_0.3Ru_0.7O₂和TiO₂之间的晶格匹配界面促进了界面电子的重新分配，并稳定了活性中心。这有助于实现双位点完全平行氧化（DFO）途径，其中中间体在Ru和Co位点同步吸附和解吸，从而实现直接O-O偶联。这项工作强调了Ru-Co双位点和TiO₂支持物在建立稳定、自我调节的电子环境中的协同作用，该环境通过DFO机制驱动有效的中间转化。

附：英文原文

Title: Dual-Site Cobalt-Doped RuO2/TiO2 Electrocatalyst Enables Stable and Cost-Efficient Acidic Oxygen Evolution for PEM Water Electrolysis

Author: Jing Liang, Yuanyuan Zhao, Chenyu Yang, Shandong Zhu, Liang Wang, Ke Xu, Xueliang Mu, Yong Han, Zhi Liu, Zhiwei Zhao, Wei Liu, Fei Li, Zhangquan Peng, Edmund C. M. Tse, Qinghua Liu, Junfeng Gao, Qing Li, Jianfeng Li, Jinxuan Liu

Issue&Volume: September 24, 2025

Abstract: Developing efficient, cost-effective, and durable electrocatalysts for proton exchange membrane water electrolysis (PEMWE) remains a significant challenge, requiring the stabilization and enhancement of catalyst activity under harsh conditions. Here, we present cobalt-doped ruthenium dioxide (Co0.3Ru0.7O2) on TiO2 as an electrocatalyst toward an acidic oxygen evolution reaction. The Co0.3Ru0.7O2–TiO2 achieves an impressive overpotential of 322 mV at 1 A cm–2 and demonstrates stable operation for over 1000 h at 500 mA cm–2 in a PEMWE device. Comprehensive experimental and theoretical calculation results demonstrate that the doping of Co atoms into the rutile RuO2 lattice optimizes the geometric configuration. Moreover, the lattice-matched interface between Co0.3Ru0.7O2 and TiO2 promotes interfacial electron redistribution and stabilizes active centers under oxidative conditions. This facilitates a dual-site fully parallel oxidation (DFO) pathway in which intermediates are synchronously adsorbed and desorbed at Ru and Co sites, enabling direct O–O coupling. This work highlights the synergistic effect of the Ru–Co dual sites and TiO2 support in establishing a stable, self-regulating electronic environment that drives efficient intermediate transformation via the DFO mechanism.

DOI: 10.1021/jacs.5c14137

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c14137