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Cobalt–Nickel Oxides with Three-Dimensional Hexagon Films for High Performance Supercapacitors
Yinan Lv,Guixia Dong,Lei Li,Jingrui Kang,Weidan Han 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.3
Cobalt–nickel oxide electrode materials with three-dimensional hexagon films or flower-shaped structures have been synthesized by a chemical precipitation method at different thermal decomposition temperatures. Nickel ions enter into the lattice of Co3O4 by forming solid solution and promote primary nanoparticles partly self-assemble into three-dimensional hexagon films which interlace with each other to form a flower-like structure. Consequently, cobalt–nickel oxide with a Ni/Co mole ratio of 1:6 at 220 ℃ displays a highest capacitance of 796.16 F/g at 200 mA/g and cobalt–nickel oxide with a Ni/Co mole ratio of 1:3 at 200 ℃ exhibits a highest capacitance of 290 F/g at 10 A/g, which significantly improve the electrochemical properties of Co3O4.