Li Qun, Wang Dewen, Lu Qingqing, Meng Tian, Yan Mengxia, Fan Libing, Xing Zhicai, Yang Xiurong
State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, Jilin, China.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, 230026, Anhui, China.
Small. 2020 Feb;16(7):e1906380. doi: 10.1002/smll.201906380. Epub 2020 Jan 29.
SrRuO as a rare conductive perovskite ruthenate has attracted increasing attention for application in energy conversion. Here, the electrocatalytic activity for the hydrogen evolution reaction (HER) of thermally synthesized layered SrRuO is investigated and shows a considerable activation during cathodic polarization in alkaline solution. The analysis demonstrates the electrode activation is caused by the increased hydrophilicity of SrRuO surface, revealing the influence of the surface properties on HER performance. For further improving the catalytic activity of perovskite ruthenate, the RuO /SrRuO (RSRO) heterostructure is fabricated in situ by reducing the thermal decomposition temperature of 1000 °C for SrRuO to 600 °C. The appropriate lattice parameter of SrRuO ensures a good lattice match, which results in a strong interaction between SrRuO and RuO . Hence, the RSRO substantially outperforms the corresponding single-component oxides. In addition, the increased active sites induced by the rapid improvement of hydrophilicity of RSRO surface further highlight its structural advantage for catalytic hydrogen generation. The experimental and theoretical computation results consistently validate the positive synergistic effect among SrRuO and RuO in tuning the atomic and electronic configuration.
作为一种稀有的导电钙钛矿钌酸盐，SrRuO在能量转换应用中受到了越来越多的关注。在此，对热合成的层状SrRuO析氢反应（HER）的电催化活性进行了研究，结果表明在碱性溶液中阴极极化过程中其具有显著的活化作用。分析表明电极活化是由SrRuO表面亲水性增加引起的，揭示了表面性质对HER性能的影响。为了进一步提高钙钛矿钌酸盐的催化活性，通过将SrRuO的热分解温度从1000℃降低到600℃原位制备了RuO /SrRuO（RSRO）异质结构。SrRuO合适的晶格参数确保了良好的晶格匹配，这导致SrRuO与RuO 之间有很强的相互作用。因此，RSRO的性能大大优于相应的单组分氧化物。此外，RSRO表面亲水性的快速提高所诱导的活性位点增加进一步突出了其在催化产氢方面的结构优势。实验和理论计算结果一致验证了SrRuO和RuO在调节原子和电子构型方面的正协同效应。
