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Designing a Copper‐ and Silver‐Sulfide Composite with Co 3 O 4 for High‐Performance Electrochemical Supercapacitors
Author(s) -
Pawar Sachin A.,
Patil Dipali S.,
Shin Jae Cheol
Publication year - 2019
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201801207
Subject(s) - pseudocapacitor , supercapacitor , materials science , copper sulfide , sulfide , electrochemistry , composite number , electrode , capacitance , cobalt sulfide , oxide , copper , chemical engineering , copper oxide , nanotechnology , composite material , chemistry , metallurgy , engineering
Electronic devices have driven modern lifestyle demands for efficient and environmentally friendly energy storage appliances. This paper reports the simple design of an efficient, cost‐effective pseudocapacitor electrode based on copper sulfide (Cu 2 S) and silver sulfide (Ag 2 S) composites with cobalt oxide (Co 3 O 4 ) for high‐performance energy storage devices. A simple one‐pot approach was used to synthesize hexagonal sheets of Co 3 O 4 and a successive ionic layer adsorption and reaction method was exploited to coat these sheets with nanostructures of Cu 2 S and Ag 2 S. The resulting three‐dimensional (3D) Co 3 O 4 /Cu 2 S and Co 3 O 4 /Ag 2 S composite electrode contained a high loading of Cu 2 S and Ag 2 S nanoparticles (metal sulfides) on the hexagonal sheets of Co 3 O 4 (metal oxide), which offers a highly conductive network assisting in rapid charge‐transfer reactions and reduces the internal resistance of the electrode. A symmetrical supercapacitor based on Co 3 O 4 /Cu 2 S//Co 3 O 4 /Cu 2 S showed a high areal capacitance of 1080 mF cm −2 , which was significantly higher than that of the Co 3 O 4 /Ag 2 S//Co 3 O 4 /Ag 2 S symmetric supercapacitor (645 mF cm −2 ). These results show that the Co 3 O 4 /Cu 2 S composite heterostructure is a promising electrode architecture for high performance pseudocapacitors.