期刊
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
卷 882, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2021.114993
关键词
Energy storage; Supercapacitor; Metal-organic frameworks; Multi-walled carbon nanotubes
资金
- National Key Research and Development Program of China [2017YFC0210201]
A novel manganese and nickel bimetallic metal-organic frameworks anchored on multi-walled carbon nanotubes were fabricated via a one-step solvothermal method, showing enhanced electrons transfer and structural integrity, achieving high specific capacitance and energy density. This promising strategy provides potential for high-performance electrochemical energy storage.
The metal-organic frameworks (MOF) is a promising electrode material for supercapacitor, but the traditional monometallic metal-organic frameworks are limited by poor conductivity and structural stability. In this work, a novel manganese (Mn) and nickel (Ni) bimetallic metal-organic frameworks anchored on multi-walled carbon nanotubes (Mn/ Ni-MOF@MWCNTs) were fabricated via a one-step solvothermal method. The morphologies, micro-structures and electrochemical properties of Mn/Ni-MOF@MWCNTs with different mass ratios of Mn and Ni were compared. The results indicated that multi-walled carbon nanotubes (MWCNTs) provides numerous active anchoring sites which is introduced into the architecture of the optimal Mn/Ni-MOF; these sites are responsible for enhancing the electrons transfer and structural integrity, with the small contact resistance and charge transfer resistance. As a result, a specific capacitance of 793.6 F g -1 at 1 A g -1 in 1 M LiOH aqueous solution was achieved, and the capacitance retention was retained at 74.92% after 1000 cycles at 1 A g -1. The crystal structures and valence band information of the anchored Mn/Ni-MOF were obtained by DFT calculation. Besides, Mn/Ni-MOF@MWCNTs//Mn/Ni-MOF@ MWCNTs symmetry supercapacitor showed an excellent energy density of 33.2 Wh kg-1 at a power density of 1198 W kg-1 and stabilizing capacity retention of 78.3% over 2000 cycles. These results provide a promising strategy for high-performance electrochemical energy storage.
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