119th General Meeting of the KCS

Type Poster Presentation
Area 전기화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code ELEC.P-533
Subject Nickel hydroxide supercapacitors based on 3D moss-like nickel current collectors [IUPAC 포스터상]
Authors 김성욱, 장지현1,*
UNIST 화학공학과, Korea
1UNIST 친환경 에너지 공학부, Korea
Abstract We introduce a simple way to the realization of the theoretical specific capacitance and high rate capability of Ni(OH)2 supercapacitors, by utilizing a dendritic three-dimensional-nickel network current collector. A simple electrodeposition method was chosen for rapid fabrication of the dendritic 3D-nickel/copper structure. The inside residual copper moiety was selectively removed to generate the hollow dendritic 3D-nickel network current collector. After nickel hydroxide was deposited, it exhibited the highest capacitance of 3,637 F g-1 at a current density of 1A g-1, and retained 97% of capacitance at a high current density of 100 A g-1 with great cycle stability of over 80% after 10,000 cycles. When tested in a two electrode system, the energy density of 22.4 Wh kg-1 at a power density of 696.9 W kg-1 was achieved. These results offer a potential for state-of-the-art energy storage systems.
E-mail sungwook@unist.ac.kr