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Boosting Electrocatalytic Water Oxidation by Creating Defects and Lattice‐Oxygen Active Sites on Ni‐Fe Nanosheets
Author(s) -
Chen Chi,
Zhang Peili,
Wang Mei,
Zheng Dehua,
Chen Junchi,
Li Fusheng,
Wu Xiujuan,
Fan Ke,
Sun Licheng
Publication year - 2020
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202001362
Subject(s) - overpotential , oxygen evolution , catalysis , hydroxide , materials science , layered double hydroxides , oxide , nickel , water splitting , inorganic chemistry , chemical engineering , tetramethylammonium hydroxide , tetramethylammonium , ion , nanotechnology , chemistry , electrochemistry , electrode , photocatalysis , metallurgy , organic chemistry , engineering
Layered nickel‐iron oxide/hydroxide nanosheets have proven to be the most efficient catalyst for the water oxidation reaction. Introducing structural defects to the nanosheets is a particularly attractive method for increasing the number of active sites and tailoring the intrinsic electronic properties. Herein, defects were introduced on Ni−Fe nanosheets through sequentially electrodoping and dedoping the surface of the material with tetramethylammonium ions. The as‐prepared defect‐rich Ni−Fe nanosheets showed an enhanced catalytic performance for the oxygen evolution reaction (OER) compared with conventional NiFe layered double hydroxides (LDHs), exhibiting an overpotential of only 172 mV at the current density of 10 mA cm −2 . The relationship between pH and OER activity indicated that the lattice oxygens participated in the catalytic OER process as active sites. This work provides new insights into the understanding of the structure‐activity relationship of layered materials and helps to develop new methods to implement defects on such frameworks aided by organic molecules.