The introduction of cobalt element into nickel-organic framework for enhanced supercapacitive performance

Metal-organic frameworks (MOFs) as promising electrodes for supercapacitors are attracting increasing research interest. Herein, we report an effective strategy to improve the electrochemical performance of Ni-MOF for supercapacitor by introducing a secondary Co ion. The Co substitution of Ni in Ni-MOF can improve the intrinsic reactivity and stability. As a result, the bimetallic Co/Ni-MOF-1:15 with an optimal Co/Ni ratio delivers high specific capacitance (359 F/g at 0.5 A/g), good rate performance (81.5% retention at 5 A/g) and cycling stability (81% retention after 50 0 0 cycles). These results demonstrate that the bimetallic synergistic strategy is an effective way to improve the pseudocapacitive performance of MOFs. & COPY; 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.

Automated summary

In this study, an effective strategy to enhance the electrochemical performance of Ni-MOF for supercapacitors was reported by introducing a secondary Co ion. The substitution of Co for Ni in Ni-MOF improved its reactivity and stability, resulting in the bimetallic Co/Ni-MOF-1:15 with high specific capacitance (359 F/g at 0.5 A/g), good rate performance (81.5% retention at 5 A/g), and cycling stability (81% retention after 500 cycles). These results highlight the effectiveness of the bimetallic synergistic strategy in enhancing the pseudocapacitive performance of MOFs.