TY - JOUR
T1 - Co3O4/MnO2/Co(OH)2 on nickel foam composites electrode with excellent electrochemical performance for supercapacitor
AU - Li, Xue
AU - Miao, Rui
AU - Tao, Bairui
AU - Miao, Fengjuan
AU - Zang, Yu
AU - Chu, Paul K.
PY - 2019/9
Y1 - 2019/9
N2 - A composite electrode containing Co3O4 nanowire arrays, ultrathin MnO2 nanosheets and nano-flake-like Co(OH)2 thin films was prepared through simple hydrothermal method combined with suitable heat treatment and electro-deposition. The Co3O4 nanowire is connected to MnO2 nanosheets, and the Co(OH)2 nanosheets are coated on the MnO2 to form a complete network. The composite electrode shows a high specific capacitance of 3022.2 F/g at a current density of 10 A/g, and a satisfactory cyclic stability with 87.9% capacitance retention after 5000 cycles. An asymmetric electrode with CCo3O4/MnO2/Co(OH)2 as the anode and activated carbon as the cathode was assembled by using 1 M KOH as electrolyte. Electrochemical performance of the Co3O4/MnO2/Co(OH)2 material was measured using CV, GCD and EIS in 1 mol L−1 KOH aqueous electrolyte. After charging for 20 s, two devices in series can light emitting diodes for about 3 min. The results indicated that the Co3O4/MnO2/Co(OH)2 material exhibited excellent electrochemical performance in terms of specific capacitance, cyclic stability, and charge/discharge stability, which is an appropriate material for supercapacitor.
AB - A composite electrode containing Co3O4 nanowire arrays, ultrathin MnO2 nanosheets and nano-flake-like Co(OH)2 thin films was prepared through simple hydrothermal method combined with suitable heat treatment and electro-deposition. The Co3O4 nanowire is connected to MnO2 nanosheets, and the Co(OH)2 nanosheets are coated on the MnO2 to form a complete network. The composite electrode shows a high specific capacitance of 3022.2 F/g at a current density of 10 A/g, and a satisfactory cyclic stability with 87.9% capacitance retention after 5000 cycles. An asymmetric electrode with CCo3O4/MnO2/Co(OH)2 as the anode and activated carbon as the cathode was assembled by using 1 M KOH as electrolyte. Electrochemical performance of the Co3O4/MnO2/Co(OH)2 material was measured using CV, GCD and EIS in 1 mol L−1 KOH aqueous electrolyte. After charging for 20 s, two devices in series can light emitting diodes for about 3 min. The results indicated that the Co3O4/MnO2/Co(OH)2 material exhibited excellent electrochemical performance in terms of specific capacitance, cyclic stability, and charge/discharge stability, which is an appropriate material for supercapacitor.
KW - Supercapacitor
KW - Co3O4/MnO2/Co(OH)2
KW - Electrochemical performance
UR - http://www.scopus.com/inward/record.url?scp=85069708032&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85069708032&origin=recordpage
U2 - 10.1016/j.solidstatesciences.2019.105941
DO - 10.1016/j.solidstatesciences.2019.105941
M3 - RGC 21 - Publication in refereed journal
SN - 1293-2558
VL - 95
JO - Solid State Sciences
JF - Solid State Sciences
M1 - 105941
ER -