Journal
CHINESE CHEMICAL LETTERS
Volume 34, Issue 7, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cclet.2022.107787
Keywords
Metal-organic frameworks; Bimetallic; Cobalt-nickel synergistic effect; Micro/nanostructures; Supercapacitors
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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.
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.
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