Zou Xu, Li Zhenyu, Liang Qing, Liu Fuxi, Xu Tiantian, Song Kexin, Jiang Zhou, Zhang Wei, Zheng Weitao
Key Laboratory of Automobile Materials MOE, and School of Materials Science & Engineering, and Electron Microscopy Center, and International Center of Future Science, and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials, Jilin University, Changchun 130012, China.
Nano Lett. 2024 Dec 18;24(50):16151-16158. doi: 10.1021/acs.nanolett.4c05139. Epub 2024 Dec 9.
The development of highly active and stable electrocatalysts for the acid oxygen evolution reaction (OER) is both appealing and challenging. The generation of defects is an emerging strategy for improving the water oxidation efficiency. Herein, we introduced multitasking Ca ions to trigger oxygen vacancies in RuO, resulting in vacancy-rich RuO (RuO-O) nanoparticles with enhanced and sustainable OER activity. The oxygen vacancy in RuO-O breaks the symmetry of the RuO octahedron, enhancing the d-band center of Ru and reducing the level of 4d-2p hybridization in Ru-O bonds. This effectively optimizes intermediate adsorption and inhibits Ru dissolution. The RuO-O catalyst achieves a current density of 10 mA/cm with an overpotential of only 198 mV, stabilizing for over 100 h (degradation rate: 0.2 mV/h). Its mass activity is 17.9 times higher than that of commercial RuO. Our work highlights that multitasking atomic construction defect engineering effectively balances the seesaw relationship between catalytic activity and stability.
开发用于酸性析氧反应（OER）的高活性和稳定的电催化剂既具有吸引力又具有挑战性。产生缺陷是提高水氧化效率的一种新兴策略。在此，我们引入多任务Ca离子以引发RuO中的氧空位，从而产生具有增强且可持续OER活性的富空位RuO（RuO-O）纳米颗粒。RuO-O中的氧空位打破了RuO八面体的对称性，提高了Ru的d带中心并降低了Ru-O键中4d-2p杂化水平。这有效地优化了中间体吸附并抑制了Ru溶解。RuO-O催化剂在过电位仅为198 mV时实现了10 mA/cm²的电流密度，稳定超过100 h（降解速率：0.2 mV/h）。其质量活性比商业RuO高17.9倍。我们的工作突出表明，多任务原子结构缺陷工程有效地平衡了催化活性和稳定性之间的跷跷板关系。
