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Layered Double Hydroxide Nanosheets with Multiple Vacancies Obtained by Dry Exfoliation as Highly Efficient Oxygen Evolution Electrocatalysts
Author(s) -
Wang Yanyong,
Zhang Yiqiong,
Liu Zhijuan,
Xie Chao,
Feng Shi,
Liu Dongdong,
Shao Mingfei,
Wang Shuangyin
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701477
Subject(s) - layered double hydroxides , exfoliation joint , monolayer , hydroxide , materials science , oxygen evolution , lamellar structure , catalysis , chemical engineering , oxygen , nanotechnology , graphene , chemistry , metallurgy , organic chemistry , electrochemistry , electrode , engineering
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).