TY - JOUR
T1 - Cobalt oxide/reduced graphene oxide composite with enhanced electrochemical supercapacitance performance
AU - Sengottaiyan, Chinnasamy
AU - Jayavel, Ramasamy
AU - Bairi, Partha
AU - Shrestha, Rekha Goswami
AU - Ariga, Katsuhiko
AU - Shrestha, Lok Kumar
N1 - Funding Information:
This study was partially supported by JSPS KAKENHI Grant Number JP 16H06518 (Coordination Asymmetry) and CREST JST Grant Number JPMJCR1665. CS thanks National Institute for Materials Science (NIMS) for the NIMS internship award.
PY - 2017
Y1 - 2017
N2 - Supercapacitors (SC) represent a superior storage system as they exhibit higher specific capacitance, higher power density, faster charge/discharge time, and longer charge/discharge cycle lifes. Specifically, hybrid SC comprising both electric double layer capacitors and pseudo-capacitive materials have received attention due to better energy storage capacity. Cobalt oxide (Co3O4), in particular, has received much research attention as pseudocapacitive material due to its favorable capacitive characteristics and environmentally friendliness. Binary nanocomposite materials comprised of Co3O4 nanocrystals embedded in reduced graphene oxide (RGO) sheet were synthesized using one-pot hydrothermal synthetic route without using any structure guiding surfactant. A 1/8 corner of a cubic shape Co3O4 crystal was observed under TEM. Shape and size of Co3O4 crystals varied from particle-type, octahedral, and aggregates of particles, with increase in concentration of Co3O4 in the Co3O4/RGO composite. Cyclic voltammetry and charge/discharge measurements in aqueous KOH electrolyte revealed that the Co3O4/RGO composite material exhibits electrochemical supercapacitive performance giving specific capacitance of 487 F/ at scan rate of 5 mV/s along with outstanding cyclic stability sustaining 96.6% of capacitance after 2000 cycles.
AB - Supercapacitors (SC) represent a superior storage system as they exhibit higher specific capacitance, higher power density, faster charge/discharge time, and longer charge/discharge cycle lifes. Specifically, hybrid SC comprising both electric double layer capacitors and pseudo-capacitive materials have received attention due to better energy storage capacity. Cobalt oxide (Co3O4), in particular, has received much research attention as pseudocapacitive material due to its favorable capacitive characteristics and environmentally friendliness. Binary nanocomposite materials comprised of Co3O4 nanocrystals embedded in reduced graphene oxide (RGO) sheet were synthesized using one-pot hydrothermal synthetic route without using any structure guiding surfactant. A 1/8 corner of a cubic shape Co3O4 crystal was observed under TEM. Shape and size of Co3O4 crystals varied from particle-type, octahedral, and aggregates of particles, with increase in concentration of Co3O4 in the Co3O4/RGO composite. Cyclic voltammetry and charge/discharge measurements in aqueous KOH electrolyte revealed that the Co3O4/RGO composite material exhibits electrochemical supercapacitive performance giving specific capacitance of 487 F/ at scan rate of 5 mV/s along with outstanding cyclic stability sustaining 96.6% of capacitance after 2000 cycles.
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U2 - 10.1246/bcsj.20170092
DO - 10.1246/bcsj.20170092
M3 - Article
AN - SCOPUS:85026769173
SN - 0009-2673
VL - 90
SP - 955
EP - 962
JO - Bulletin of the Chemical Society of Japan
JF - Bulletin of the Chemical Society of Japan
IS - 8
ER -