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Growth of Lattice Coherent Co 9 S 8 /Co 3 O 4 Nano‐Heterostructure for Maximizing the Catalysis of Co‐Based Composites
Author(s) -
Peng Dongdong,
Zhang Bowei,
Wu Junsheng,
Huang Kang,
Cao Xun,
Lu Yu,
Zhang Yong,
Li Chaojiang,
Huang Yizhong
Publication year - 2020
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.202000044
Subject(s) - overpotential , tafel equation , materials science , microstructure , oxygen evolution , heterojunction , annealing (glass) , hydroxide , catalysis , water splitting , chemical engineering , electrocatalyst , ion , electrode , nanotechnology , inorganic chemistry , composite material , electrochemistry , chemistry , photocatalysis , optoelectronics , biochemistry , organic chemistry , engineering
Gas purging during electrodeposition has significant influence on microstructures and compositions of materials. Co−Mn LDH was electrodeposited on Ni foam without gas purging. In contrast, the product grown by electrodeposition with N 2 purging changes to Co 9 S 8 /Co 3 O 4 heterostructure with the assistance of annealing. This remarkable distinction is mainly due to the decrease of concentration of hydroxide ions (produced by the reduction of NO 3 − ) near electrode surface where the ion transport is remarkably enhanced by N 2 purging. The heterostructure has shown superior performance for water splitting, especially for oxygen evolution reaction (OER). The 250 mV overpotential (@ 10 mA ⋅ cm −2 ) and 73.54 mV ⋅ dec −1 Tafel slope required for OER are lower than that of the state‐of‐the‐art Co‐based composites. It has also demonstrated excellent durability in alkaline media indicating its promising potential for practical application in industry.