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Formation of Dandelion‐Like Co 3 O 4 /CoWO 4 Heterojunctions for Enhanced Supercapacitive Performance
Author(s) -
Ding Kun,
Zhang Xiao,
Li Juping,
Yang Ping,
Cheng Xin
Publication year - 2017
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201700704
Subject(s) - hydrothermal circulation , electrochemistry , heterojunction , materials science , electrode , chemical engineering , morphology (biology) , nanoparticle , capacitance , phase (matter) , decomposition , nanotechnology , chemistry , optoelectronics , organic chemistry , biology , engineering , genetics
The dandelion‐like Co 3 O 4 /CoWO 4 heterostructure was fabricated for the first time through a two‐step hydrothermal method involving the preparation of urchin‐like Co(CO 3 ) 0.5 (OH) ⋅ 0.11H 2 O at low temperature, as well as its decomposition and an in situ growth of CoWO 4 nanoparticles at relatively high temperature. It is noted that the introduction of Na 2 WO 4 ⋅ 2H 2 O can maintain the morphology stability of precursor and promote the growth of CoWO 4 species, whilst the precursor can be decomposed into the Co 3 O 4 phase at higher hydrothermal temperature. The effects of Na 2 WO 4 ⋅ 2H 2 O on the morphology and electrochemical properties of Co 3 O 4 material were discussed. The electrochemical results showed that the Co 3 O 4 /CoWO 4 hybrid electrode exhibited enhanced specific capacitance, which was 3.4 times larger than that of the pure Co 3 O 4 electrode. The enhanced electrochemical properties were ascribed to the reasonable combination of these two types of electrochemically active materials and its unique architectural feature.