Zhao Tao, Du Runxin, Fang Qiang, Hao Genyan, Liu Guang, Zhong Dazhong, Li Jinping, Zhao Qiang
College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, P. R. China.
Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Taiyuan, Shanxi, 030024, P. R. China.
Small. 2025 Jul;21(29):e2410311. doi: 10.1002/smll.202410311. Epub 2024 Dec 23.
Ruthenium oxide (RuO) is considered one of the most promising catalysts for replacing iridium oxide (IrO) in the acidic oxygen evolution reaction (OER). Nevertheless, the performance of RuO remains unacceptable due to the dissolution of Ru and the lack of *OH in acidic environments. This paper reports a grain boundary (GB)-rich porous RuO electrocatalyst for the efficient and stable acidic OER. The involvement of GB regulates the valence state of Ru and weakens the interaction between Ru and O, effectively facilitating *OH adsorption and *OOH formation. Notably, achieved a record-high catalytic activity (145 mV at 10 mA cm) with a low Tafel slope (40.9 mV dec) and a remarkable mass activity of 332 mA mg at 1.5 V versus reversible hydrogen electrode is achieved. Additionally, the porous RuO exhibits superb stability with an ultra-low degradation rate of 26 µV h over a 50-day durability test. This study opens a viable pathway for the development of efficient and robust Ru-based acidic OER electrocatalysts.
氧化钌（RuO）被认为是在酸性析氧反应（OER）中替代氧化铱（IrO）最有前景的催化剂之一。然而，由于Ru的溶解以及在酸性环境中缺乏OH，RuO的性能仍然难以令人接受。本文报道了一种富含晶界（GB）的多孔RuO电催化剂，用于高效稳定的酸性OER。晶界的参与调节了Ru的价态，削弱了Ru与O之间的相互作用，有效地促进了OH吸附和*OOH形成。值得注意的是，在相对于可逆氢电极1.5 V时，实现了创纪录的高催化活性（在10 mA cm时为145 mV），具有低塔菲尔斜率（40.9 mV dec）和332 mA mg的显著质量活性。此外，在50天的耐久性测试中，多孔RuO表现出极好的稳定性，超低降解速率为26 μV h。这项研究为开发高效且耐用的Ru基酸性OER电催化剂开辟了一条可行的途径。
