화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.63, 73-83, July, 2018
DOI10.1016/j.jiec.2018.02.001  Export Citation
Rambutan-like cobalt nickel sulfide (CoNi2S4) hierarchitecture for high-performance symmetric aqueous supercapacitors
John Anthuvan Rajesh, Jeong-Hyun Park1, Vu Hong Vinh Quy, Jong Myeong Kwon, Jiyoung Chae, Soon-Hyung Kang2, Hyunsoo Kim3, †, and Kwang-Soon Ahn†
  • School of Chemical Engineering, Yeungnam University, Gyeongsan 712-749 South Korea
  • 1Department of Energy Systems Engineering, DGIST, Daegu 711-873, South Korea
  • 2Department of Chemistry Education, Chonnam National University, Gwangju 500-757, South Korea
  • 3School of Semiconductor and Chemical Engineering, Chonbuk National University, Jeonju 561-756, South Korea
E-mail:,
A novel hierarchical cobalt nickel sulfide (CoNi2S4) nanostructure resembling the rambutan fruit was obtained by a simple one-step hydrothermal method using ethylene glycol as the solvent. Scanning and transmission electron microscopic analyses revealed that the as-synthesized CoNi2S4 consists of numerous hairy nanorods grown radially on top of individual sphere-like core structures. The CoNi2S4 hierarchical material was applied as a potential electrode for supercapacitors in both three- and two- electrode systems. The hairy nanorods and spheres were highly interconnected to form hierarchical rambutan-like CoNi2S4 structure with increased active areas of the electrode, and this facilitate effective charge transport from the nanorods to the spherical core structure. When evaluated as an electrode material in a three-electrode system, CoNi2S4 with the hierarchical structure delivered a high specific capacitance of 1102.22 F g-1 at a current density of 1 A g-1 with excellent rate capability (68.55% capacitance retention as the current increases from 1 to 10 A g-1) and significant cycling stability (75% retention after 3000 cycles). The electrochemical properties of the hierarchical CoNi2S4 were also investigated in a symmetrical cell arrangement using 2 M aqueous KOH as the electrolyte. The symmetric aqueous supercapacitor exhibited a specific capacitance of 482 F g-1 at 1 A g-1 with maximum energy density of 16.74 Wh kg-1 and maximum power density of 10.2 kW kg-1. Furthermore, the symmetric supercapacitor exhibited excellent cycling stability, showing 92.85% capacitance retention even after 5000 cycles.
Keywords:Rambutan-like CoNi2S4;Hierarchitecture;Hydrothermal;Supercapacitor;Symmetrical cell
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