A high N content cobalt-based metal organic framework with nanorod structure for supercapacitor electrode material

摘要

A high N content supercapacitor electrode material, cobalt-based metal organic framework (named as Co-MOF) with a structure of nanorod, is prepared by solvothermal method. The synthesis temperature and feed ratio are optimized (140 degrees C, 1:2 M ratio of Co to the ligand) to achieve 414.5 F g(-1) specific capacitance at a current density of 0.5 A g(-1) in 3 M KOH. The prepared electrode in two-electrode test also delivers a specific capacitance of 334.4 F g(-1) at 0.5 A g(-1) with an energy density 12.0 Wh kg(-1) at the power density of 258.1 W kg(-1). More significantly, the capacitance retention rate is up to 113% after 20,000 cycles at a current density of 10 A g(-1), which can be attributed to the electrochemical activation process.