Abstract: In this study， cobalt- based metal organic frameworks （Co- BTC MOFs） materials were synthesized based on Co（NO₃）₂ ·6H₂O as the central ion and 1，3，5-Benzenetricarboxylicacid （BTC） as the organic ligand and it was used as the electrode material for the supercapacitor. The electrochemical properties of them were studied by cyclic voltammetry and galvanostatic charge- discharge. The Co- BTC MOFs materials with 5 kinds of different molar ratio of reactants were prepared using the control variable method，and then the morphology and structure of them were characterized by scanning electron microscopy （SEM） and X- ray diffraction （XRD）. The results indicated that Co- BTC MOFs exhibited a high galvanostatic charge- discharge specific capacitance of 289. 3 F/g at the current density of 0. 5 A/g while the molar ratio of Co（NO₃）₂ ·6H₂O to BTC was 1∶7 and the reaction temperature was 140 ℃. The specific capacitance retained 87. 59 % of its initial discharge capacitance after 1 000 cycles at a current density of 10 A/g，which illustrated it had a high cyclic stability.

Key words: 1，3，5- Benzenetricarboxylicaci, Co- based MOFs materials, super capacitor, specific capacitance, molar ratio