Abstract
Carbon materials from zeolitic imidazolate framework (ZIF) present poor electrochemical performance as electrode materials for supercapacitors. In this work, well-intergrown ZIF nanocystals are strung on MWCNTs to form necklace architecture. After carbonization and chemical etching, porous carbons with necklace architecture and proper hierarchical micro-mesoporous structure were obtained. It exhibits excellent electrochemical performance as electrode material for supercapacitor in 1 M H2SO4 solution such as high specific capacitance up to 326 F·g−1 at 1 A·g−1, good rate capability and excellent cycling stability of 99.7% capacitance retention after 10000 cycles. The main reasons are due to the increased surface area, the improved electrical conductivity, and the combination of micro- and meso-porous structure. This provides another promising way to design porous carbons from ZIF materials for supercapacitors.
Original language | English |
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Pages (from-to) | 260-269 |
Number of pages | 10 |
Journal | Electrochimica Acta |
Volume | 213 |
DOIs | |
State | Published - 20 Sep 2016 |
Keywords
- ZIF-8
- porous carbon
- supercapacitor
- zeolitic imidazolate framework