Cobalt-carbon derived from zeolitic imidazolate framework on Ni foam as high-performance supercapacitor electrode material

作者：Yang, Jinlin; Zeng, Chun; Wei, Fuxiang^*; Jiang, Jiaqiang; Chen, Keyi; Lu, Shenghai

来源：Materials and Design, 2015, 83: 552-556.

DOI：10.1016/j.matdes.2015.06.077

• Metal-organic framework
• Cobalt/carbon composites
• Well-controlled particles
• Supercapacitor

ZIF-67 (Co(MeIM)(2), MeIM = 2-methylimidazole) was selected as a precursor to synthesize the metallic cobalt/carbon composites on Ni foam directly and intimately. The results show that ZIF-67 forms a uniform membrane and densely covers the Ni foam substrate. Besides, the cobalt/carbon composites obtained are composed of cobalt nanoparticles with a diameter up to around 2.6 nm, which are anchored on carbon homogeneously. The specific capacitance of the composites material is up to 512 F g(-1) at a current density of 1 A g(-1) in 1.0 M KOH electrolyte. Furthermore, the specific capacitance loss is similar to 46.4% with increase at the current density from 1 to 20A g(-1). More significantly, the specific capacitance retention rate is 87.5% at a current density of 5 A g(-1) after 1000 cycles. These results suggest that the electrochemical performance can be greatly enhanced by the well-controlled size and distribution of the cobalt nanoparticles, which is mainly attributed to the unique structure and composition of ZIF-67.

• 单位
  中国矿业大学（北京）