期刊
MATERIALS TODAY PHYSICS
卷 23, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtphys.2022.100655
关键词
Metal organic framework; Flexible device; DFT calculations; Solution-free CuO; Supercapacitor
资金
- Hong Kong Research Grants Council [CityU 11218420]
- Deanship of Scientific Research at King Khalid University Saudi Arabia [70/43]
In this study, a pouch-type supercapacitor was developed using flexible materials, exhibiting excellent electrochemical activity, high energy density, and cycling stability, showcasing the promising potential for next-generation electrochemical energy storage devices.
Pouch-type supercapacitor was developed by employing flexible Zn-Co-metal organic framework (MOF) @CuO and porous reduced graphene oxide as active electrodes. The flexible Zn-Co-MOF@CuO was fabricated by a facile two-step strategy. In the first step, Cu mesh was oxidized to cupric oxide (CuO) by a solution-free treatment. In the second step, Zn-Co-MOF was deposited on CuO scaffold through a sol-vothermal treatment. The as-prepared integrated Zn-Co-MOF@CuO exhibited excellent flexibility at different bending angles. The flexible Zn-Co-MOF@CuO displayed excellent electrochemical activity during three-electrode testing due to the merits of high electrical conductivity and an existence of p-n heterojunction between CuO and Zn-Co-MOF. The as-fabricated pouch supercapacitor yielded a high energy density of 41 W h kg(-1) at a current density of 1 A g(-1) and an excellent cycling stability of 97% after 20,000 cycles. Structural and superior electronic properties of Zn-Co-MOF@CuO were further verified through first principles calculations based on density functional theory (DFT), which perfectly supported the experimental results. The excellent electrochemical attributes of the flexible pouch supercapacitor show immense promise for next-generation electrochemical energy storage devices. (c) 2022 Elsevier Ltd. All rights reserved.
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