Controllable preparation and capacitance performance of bimetal Co/Ni-MOF

• Published in: Synthetic metals 2021-06, Vol.276, p.116761, Article 116761
• Main Authors: Chen, Hui-ya, Huo, Yu-qiu, Cai, Kui-zhe, Teng, Ying
• Format: Article
• Language: English
• Subjects: Asymmetry; Bimetal MOF; Bimetals; Capacitance; Capacitance performance; Co/Ni; Electrochemical analysis; Electrode materials; Flux density; Metal-organic frameworks; Nickel; Stability; Supercapacitors
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2021.116761

In this paper, bimetal Co/Ni organic framework material (Co/Ni-MOF) is prepared by one-step solvothermal method. By adjusting the concentration of the inserted metal Ni, the electrochemical performance of bimetal MOF is controlled. As cobalt to nickel ratio is 1:2, its largest specific capacitance value is 2608 F g−1 at 1 A g−1 and it remains 88% after 5000 charging-discharging cycles. As well as its ion transfer time is the shortest among those of the other bimetal MOF. After assembled into supercapacitors with biochar, it delivers an energy density of 47.3 Wh kg−1 at 780 W kg−1 and 85% of its initial specific capacitance is obtained after 5000 cycles. These results confirm its potential application as electrode material of supercapacitor devices. [Display omitted] •A bimetal Co/Ni-MOF is prepared by one-step solvothermal method.•Its largest specific capacitance value is 2608 F g−1 at 1 A g−1.•The capacitance retention rate is 88% after 5000 charging-discharging cycles.•The energy density of Co/Ni-MOF//BC is 47.3 Wh kg−1 at 780 W kg−1.