期刊
ELECTROCHIMICA ACTA
卷 422, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.140560
关键词
Supercapacitors; MOF; Binder-free; CQD; Hybrid supercapacitor
资金
- Fundamental Research Program of Shanxi Province [20210302123067, 20210302124643, 202103021224181]
- Program for the Outstanding Innovative Teams of Higher Learning Institutions of Shanxi
Carbon quantum dot (CQD)/NiMOF composites were successfully synthesized in this study. The CQDs effectively enhanced the electrical conductivity of NiMOF and regulated its morphology to expose abundant active sites, leading to improved electrochemical performance. The CQD@MOF composite showed outstanding cycling stability and the hybrid supercapacitors exhibited a high energy density.
Rational design of metal-organic framework (MOF) materials with rich active sites and high conductivity is very important for their applications in the energy storage devices, but it is still a great challenge. Herein, carbon quantum dot (CQD)/NiMOF composites are synthesized via a one-pot hydrothermal method. The experimental results show that CQDs can effectively enhance the electrical conductivity of NiMOF and regulate its morphology to expose abundant active sites, which are beneficial for electrochemical performance. The as-prepared CQD@MOF composite delivers a specific capacitance of 2457.9 F g-1 at 1 A g-1, and the outstanding cycling stability with the capacitance retention of 84.5% after 5000 charge/discharge cycles. Moreover, the hybrid supercapacitors with activated carbon (AC) as the negative electrode and CQD@MOF as the positive electrode exhibits a wide voltage window of 1.7 V and a high energy density of 67.1 Wh kg- 1 at a power density of 5.1 kW kg- 1. The results can effectively boost the electrochemical performance of MOF and promote its application in supercapacitor electrode materials.
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