Layered Double Hydroxide Nanosheets with Multiple Vacancies Obtained by Dry Exfoliation as Highly Efficient Oxygen Evolution Electrocatalysts |
| |
| Authors: | Yanyong Wang Yiqiong Zhang Zhijuan Liu Chao Xie Shi Feng Dongdong Liu Prof Mingfei Shao Prof Shuangyin Wang |
| |
| Institution: | 1. State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Provincial Hunan Key Laboratory for Graphene Materials and Devices, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082 Hunan, China;2. State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China |
| |
| Abstract: | Layered double hydroxides (LDHs) with two-dimensional lamellar structures show excellent electrocatalytic properties. However, the catalytic activity of LDHs needs to be further improved as the large lateral size and thickness of the bulk material limit the number of exposed active sites. However, the development of efficient strategies to exfoliate bulk LDHs into stable monolayer LDH nanosheets with more exposed active sites is very challenging. On the other hand, the intrinsic activity of monolayer LDH nanosheets can be tuned by surface engineering. Herein, we have exfoliated bulk CoFe LDHs into ultrathin LDH nanosheets through Ar plasma etching, which also resulted in the formation of multiple vacancies (including O, Co, and Fe vacancies) in the ultrathin 2D nanosheets. Owing to their ultrathin 2D structure, the LDH nanosheets expose a greater number of active sites, and the multiple vacancies significantly improve the intrinsic activity in the oxygen evolution reaction (OER). |
| |
| Keywords: | Cobalt Doppelschichthydroxide Eisen Sauerstoffentwicklung Trockenexfoliation Ultradünne Nanoschichten |
|
|
