TY - JOUR
T1 - Asymmetrical supercapacitor composed of thin Co(OH)2 nanoflakes on three-dimensional Ni/Si microchannel plates with superior electrochemical performance
AU - Li, Mai
AU - Xu, Shaohui
AU - Cherry, Christopher
AU - Zhu, Yiping
AU - Huang, Rong
AU - Qi, Ruijuan
AU - Yang, Pingxiong
AU - Wang, Lianwei
AU - Chu, Paul K.
N1 - Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2014/12/10
Y1 - 2014/12/10
N2 - Nanoscale cobalt hydroxide (Co(OH)2) particles are fabricated by electrodeposition on three-dimensional nickel/silicon microchannel plates (Ni/Si-MCPs) as the active electrode materials on the surface and sidewall of the Ni/Si-MCPs for miniature supercapacitors. The relationship among the electrodeposition time, morphology, formation mechanism of Co(OH)2 nanostructure, and capacitor performance is studied. Using an optimal electrodeposition time of 6 min, the Co(OH)2 supercapacitor has a capacitance of 697.56 F g-1 (5.72 F cm-2) at 2 mA cm-2 and the retention ratio is 91.20% after 2500 cycles. The large areal capacitance and excellent rate capability can be attributed to the unique 3D ordered porous architecture which facilitates electron and ion transport, enlarges the liquid-solid interfacial area, and enhances the utilization efficiency of the active materials. Meanwhile, the weight and size of the device are reduced. By using the Co(OH)2/Ni/Si-MCPs electrode as the positive electrode and CNTs/nickel foam (CNTs/NF) as the negative electrode, the device assembled with CR2025 batteries exhibits high energy density (38.39 Wh kg-1), high power density (5400 W kg-1 at 9.67 Wh kg-1), and stable power characteristic (2000 times with 80.63% retention). After charging each supercapacitor for 10 s, the device can power a 5 mm diameter light-emitting diode (LED) with different colors efficiently, for example, a blue LED for 20 min.
AB - Nanoscale cobalt hydroxide (Co(OH)2) particles are fabricated by electrodeposition on three-dimensional nickel/silicon microchannel plates (Ni/Si-MCPs) as the active electrode materials on the surface and sidewall of the Ni/Si-MCPs for miniature supercapacitors. The relationship among the electrodeposition time, morphology, formation mechanism of Co(OH)2 nanostructure, and capacitor performance is studied. Using an optimal electrodeposition time of 6 min, the Co(OH)2 supercapacitor has a capacitance of 697.56 F g-1 (5.72 F cm-2) at 2 mA cm-2 and the retention ratio is 91.20% after 2500 cycles. The large areal capacitance and excellent rate capability can be attributed to the unique 3D ordered porous architecture which facilitates electron and ion transport, enlarges the liquid-solid interfacial area, and enhances the utilization efficiency of the active materials. Meanwhile, the weight and size of the device are reduced. By using the Co(OH)2/Ni/Si-MCPs electrode as the positive electrode and CNTs/nickel foam (CNTs/NF) as the negative electrode, the device assembled with CR2025 batteries exhibits high energy density (38.39 Wh kg-1), high power density (5400 W kg-1 at 9.67 Wh kg-1), and stable power characteristic (2000 times with 80.63% retention). After charging each supercapacitor for 10 s, the device can power a 5 mm diameter light-emitting diode (LED) with different colors efficiently, for example, a blue LED for 20 min.
KW - Ultrathin cobalt hydroxide
KW - cobalt hydroxide
KW - silicon microchannel plates
KW - supercapacitors
UR - https://www.scopus.com/pages/publications/84908419280
U2 - 10.1016/j.electacta.2014.10.091
DO - 10.1016/j.electacta.2014.10.091
M3 - 文章
AN - SCOPUS:84908419280
SN - 0013-4686
VL - 149
SP - 18
EP - 27
JO - Electrochimica Acta
JF - Electrochimica Acta
ER -