4.7 Article

Dual pore-former method to prepare nitrogen-doped hierarchical porous carbons for supercapacitors

Journal

JOURNAL OF ALLOYS AND COMPOUNDS
Volume 895, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162587

Keywords

Hierarchical porous carbons; Zinc acetate; Potassium citrate; Chitosan hydrogel; Supercapacitor

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A simple dual pore-former method was proposed to prepare nitrogen-doped hierarchical porous carbons (CHC-ZnK), which exhibited high specific capacitance and excellent rate performance.
Nitrogen-doped hierarchical porous carbons are an ideal electrode material for achieving high-performance supercapacitors. However, the design and control of hierarchical porous structure generally requires complicated synthesis steps and expensive pore-former, which greatly limits its development. A simple dual pore-former method with one-step carbonization is proposed to prepare nitrogen-doped hierarchical porous carbons (CHC-ZnK). The dual pore-former of zinc acetate and potassium citrate can not only prepare pores of different sizes through a variety of mechanisms, but also have a great complementary effect on the control of the carbon material structure. CHC-ZnK with the hierarchical porosity and the large surface area delivers high specific capacitance of 408.9 F g(-1) and excellent rate performance. The assembled symmetric supercapacitor exhibits high energy density and can ensure that the light-emitting diode run normally. (C) 2021 Elsevier B.V. All rights reserved.

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