Constructing Atomic Heterometallic Sites in Ultrathin Nickel-Incorporated Cobalt Phosphide Nanosheets via a Boron-Assisted Strategy for Highly Efficient Water Splitting

• Published in: Nano letters 2021-01, Vol.21 (1), p.823-832
• Main Authors: Zhao, Yufei, Zhang, Jinqiang, Xie, Yuhan, Sun, Bing, Jiang, Junjie, Jiang, Wen-Jie, Xi, Shibo, Yang, Hui Ying, Yan, Kang, Wang, Shijian, Guo, Xin, Li, Peng, Han, Zhaojun, Lu, Xunyu, Liu, Hao, Wang, Guoxiu
• Format: Article
• Language: English
• ISSN: 1530-6984; 1530-6992
• DOI: 10.1021/acs.nanolett.0c04569

Identification of active sites for highly efficient catalysts at the atomic scale for water splitting is still a great challenge. Herein, we fabricate ultrathin nickel-incorporated cobalt phosphide porous nanosheets (Ni-CoP) featuring an atomic heterometallic site (NiCo P ) via a boron-assisted method. The presence of boron induces a release-and-oxidation mechanism, resulting in the gradual exfoliation of hydroxide nanosheets. After a subsequent phosphorization process, the resultant Ni-CoP nanosheets are implanted with unsaturated atomic heterometallic NiCo P sites (with Co vacancies) for alkaline hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). The optimized Ni-CoP exhibits a low overpotential of 88 and 290 mV at 10 mA cm for alkaline HER and OER, respectively. This can be attributed to reduced free energy barriers, owing to the direct influence of center Ni atoms to the adjacent Co/P atoms in NiCo P sites. These provide fundamental insights on the correlation between atomic structures and catalytic activity.