Sun Wen, Fang Ying, Sun Gaoming, Dai Congfu, Liu Yana, Zhang Jiguang, Zhu Yunfeng, Wang Jun
College of Materials Science and Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, P. R. China.
Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 211816, P. R. China.
Chem Asian J. 2023 Aug 15;18(16):e202300440. doi: 10.1002/asia.202300440. Epub 2023 Jul 10.
Proton exchange membrane water electrolysers and alkaline exchange membrane water electrolysers for hydrogen production suffer from sluggish kinetics and the limited durability of the electrocatalyst toward oxygen evolution reaction (OER). Herein, a rutile Ru Mn O solid solution oxide featured with a hierarchical porous structure has been developed as an efficient OER electrocatalyst in both acidic and alkaline electrolyte. Specifically, compared with commercial RuO , the catalyst displays a superior reaction kinetics with small Tafel slope of 54.6 mV dec in 0.5 M H SO , thus allowing a low overpotential of 237 and 327 mV to achieve the current density of 10 and 100 mA cm , respectively, which is attributed to the enhanced electrochemically active surface area from the porous structure and the increased intrinsic activity owing to the regulated Ru proportion with Mn incorporation. Additionally, the sacrificial dissolution of Mn relieves the leaching of active Ru species, leading to the extended OER durability. Besides, the Ru Mn O catalyst also shows a highly improved OER performance in alkaline electrolyte, rendering it a versatile catalyst for water splitting.
用于制氢的质子交换膜水电解槽和碱性交换膜水电解槽存在动力学迟缓以及电催化剂对析氧反应（OER）耐久性有限的问题。在此，一种具有分级多孔结构的金红石型RuMnO固溶体氧化物已被开发为酸性和碱性电解质中高效的OER电催化剂。具体而言，与商业RuO相比，该催化剂在0.5 M H₂SO₄中具有54.6 mV dec⁻¹的小塔菲尔斜率，显示出优异的反应动力学，因此分别实现10和100 mA cm⁻²电流密度时的过电位低至237和327 mV，这归因于多孔结构使电化学活性表面积增加以及由于Mn掺入调节Ru比例导致本征活性提高。此外，Mn的牺牲性溶解减轻了活性Ru物种的浸出，从而延长了OER耐久性。此外，RuMnO催化剂在碱性电解质中也表现出高度改善的OER性能，使其成为用于水分解的通用催化剂。
