Lin Gaoxin, Wang Yuandong, Hong Jinhua, Suenaga Kazu, Liu Lijia, Chang Lo-Yueh, Pao Chih-Wen, Zhang Tao, Zhao Wei, Huang Fuqiang, Yang Minghui, Sun Yi-Yang, Wang Jiacheng
State Key Lab of High Performance Ceramics and Superfine microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
University of Chinese Academy of Sciences, 100049, Beijing, China.
ChemSusChem. 2020 May 22;13(10):2739-2744. doi: 10.1002/cssc.202000213. Epub 2020 Apr 8.
Electrocatalytic water splitting, as one of the most promising methods to store renewable energy generated by intermittent sources, such as solar and wind energy, has attracted tremendous attention in recent years. Developing efficient, robust, and green catalysts for the hydrogen and oxygen evolution reactions (HER and OER) is of great interest. This study concerns a facile and green approach for producing RuNi/RuNi oxide nanoheterostructures by controllable partial oxidation of RuNi nanoalloy, which is characterized and confirmed by various techniques, including high-resolution transmission electron microscopy and synchrotron-based X-ray absorption spectroscopy. This nanoheterostructure demonstrates outstanding bifunctional activities for catalyzing the HER and OER with overpotentials that are both among the lowest reported values. In a practical alkali-water-splitting electrolyzer, it also achieves a record-low cell voltage of 1.42 V at 10 mA cm , which is significantly superior to the commercial RuO //Pt/C couple and other reported bifunctional water-splitting electrocatalysts. Density functional theory calculations are employed to elaborate the effect of Ni incorporation. This simple catalyst preparation approach is expected to be transferrable to other electrocatalytic reactions.
电催化水分解作为存储由间歇性能源（如太阳能和风能）产生的可再生能源的最有前景的方法之一，近年来受到了极大的关注。开发用于析氢反应（HER）和析氧反应（OER）的高效、稳健且绿色的催化剂备受关注。本研究涉及一种通过对RuNi纳米合金进行可控部分氧化来制备RuNi/RuNi氧化物纳米异质结构的简便绿色方法，该方法通过包括高分辨率透射电子显微镜和基于同步加速器的X射线吸收光谱在内的各种技术进行表征和确认。这种纳米异质结构在催化HER和OER方面表现出出色的双功能活性，其过电位均处于报道的最低值之列。在实际的碱性水分解电解槽中，它在10 mA cm时还实现了创纪录的低电池电压1.42 V，明显优于商业RuO//Pt/C电极对和其他报道的双功能水分解电催化剂。采用密度泛函理论计算来阐述镍掺入的影响。这种简单的催化剂制备方法有望推广到其他电催化反应中。
