Lin Benfeng, le Huafeng, Xu Feng, Mu Shichun
College of Materials Science and Engineering, Fuzhou University Fuzhou 350108 P. R. China
Key Laboratory of Eco-materials Advanced Technology, Fuzhou University 350108 P. R. China.
RSC Adv. 2020 Jul 22;10(46):27424-27427. doi: 10.1039/d0ra02985h. eCollection 2020 Jul 21.
The amount of active sites of a catalyst is of great importance to enhance the oxygen evolution reaction (OER) activity. Here, the sheet-on-sheet strategy is proposed to effectively increase the density of active sites of NiFe layered double hydroxide (NiFe LDH) catalyst in terms of structural engineering. As a non-precious electrocatalyst for the OER, NiFe LDH is grown directly on CuO nanosheets. As a result, the received NiFe LDH/CuO nanosheet catalyst with sheet-on-sheet structure shows an ultralow overpotential of 270 mV at 20 mA cm, much lower than that of RuO as a benchmark. The CuO nanosheets, as substrate, play the vital role in downsizing the NiFe LDH, leading to the raised active site density.
催化剂活性位点的数量对于提高析氧反应（OER）活性至关重要。在此，提出了层状生长策略，旨在通过结构工程有效地提高镍铁层状双氢氧化物（NiFe LDH）催化剂的活性位点密度。作为一种用于OER的非贵金属电催化剂，NiFe LDH直接生长在CuO纳米片上。结果，所制备的具有层状结构的NiFe LDH/CuO纳米片催化剂在20 mA cm时显示出270 mV的超低过电位，远低于作为基准的RuO。作为基底的CuO纳米片在减小NiFe LDH尺寸方面起着至关重要的作用，从而提高了活性位点密度。
