Large-scale multirole Zn(II) programmed synthesis of ultrathin hierarchically porous carbon nanosheets

Ling Song Xu, Fan Cheng Meng, Xiang Feng Wei, Chang Hao Lin, Lian Xi Zheng, Jie Hua Liu

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

ZIF-derived carbon structures are considered as desired electrode materials for supercapacitors due to their high surface area, high conductivity, and porous structure. However, the most reported ratio of 2-methylimidazole and Zn(II) is 4:1 to 20:1, which limits commercial applications due to the increasing cost. In this paper, a multirole Zn(II)-assisted method is presented from Zn(II) solution, ZnO, ZnO/ZIF-8 core-shell nanostructure, to 3D hierarchical micro-meso-macroporous carbon structures with a 1:1 ratio of 2-methylimidazole and Zn(II). The hierarchically porous carbon has a high surface area of 1800 m2 g−1 due to the synergistic effect of multirole Zn(II). The unique carbon-based half-cell delivers the specific capacitances of 377 and 221 F g−1 at the current densities of 1.0 and 50 A g−1, respectively. As a 2.5 V symmetrical supercapacitor, the device reveals a high double-layer capacitance of 24.4 F g−1, a power density of 62.5 kW kg−1, and more than 85.8% capacitance can be retained over 10000 cycles at 10 A g−1. More importantly, the low-cost hierarchically porous carbon could be easily produced on a large scale and almost all chemicals can be reused in the sustainable method.

Original languageBritish English
Pages (from-to)1730-1738
Number of pages9
JournalScience China Technological Sciences
Volume63
Issue number9
DOIs
StatePublished - 1 Sep 2020

Keywords

  • carbon nanosheets
  • hierarchically porous carbon
  • multirole Zn(II)
  • N doping
  • supercapacitor

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