Zhou Tingting, Cao Zhen, Tai Xishi, Yu Lei, Ouyang Jian, Li Yunfei, Lu Jitao
College of Chemical Engineering and Environmental Chemistry, Weifang University, Weifang 261061, China.
Shenzhen Kohodo Hydrogen Energy Co., Ltd., Shenzhen 518109, China.
Polymers (Basel). 2022 Apr 8;14(8):1510. doi: 10.3390/polym14081510.
It is critical to develop efficient oxygen evolution reaction (OER) catalysts with high catalytic properties for overall water splitting. Electrocatalysts with enriched vacancies are crucial for enhancing the catalytic activity of OER through defect engineering. We demonstrated the dealloying method in a reducing alkaline solution using the CoAl alloy foil as a precursor to produce a new oxygen-vacancy-rich cobalt hydroxide (O-Co(OH)) hierarchical dendrite. The as-synthesised O-Co(OH) showed superior electrocatalytic activities toward OER when compared to pristine cobalt hydroxide (-Co(OH)), which had a low onset overpotential of only 242 mV and a small Tafel slope of 64.9 mV dec. Additionally, for the high surface area provided by the hierarchical dendrite, both -Co(OH) and O-Co(OH) showed a superior activity as compared to commercial catalysts. Furthermore, they retained good catalytic properties without remarkably decaying at an overpotential of 350 mV for 12 h. The as-made O-Co(OH) has prospective applications as an anode electrocatalyst in electrochemical water-splitting technologies with the advantages of superior OER performances, large surface area and ease of preparation.
开发具有高催化性能的高效析氧反应（OER）催化剂对于整体水分解至关重要。具有丰富空位的电催化剂对于通过缺陷工程提高OER的催化活性至关重要。我们展示了在还原碱性溶液中使用CoAl合金箔作为前驱体的脱合金方法，以制备一种新型的富含氧空位的氢氧化钴（O-Co(OH)）分级枝晶。与原始氢氧化钴（-Co(OH)）相比，合成的O-Co(OH)对OER表现出优异的电催化活性，原始氢氧化钴的起始过电位仅为242 mV，塔菲尔斜率为64.9 mV dec。此外，由于分级枝晶提供了高表面积，-Co(OH)和O-Co(OH)与商业催化剂相比都表现出优异的活性。此外，它们在350 mV的过电位下保持12小时仍具有良好的催化性能，且没有明显衰减。制备的O-Co(OH)作为阳极电催化剂在电化学水分解技术中具有潜在应用，具有优异的OER性能、大表面积和易于制备的优点。
