Issue 24, 2023

Enlarging the porosity of metal–organic framework-derived carbons for supercapacitor applications by a template-free ethylene glycol etching method

Abstract

In this work, hierarchically porous bimetallic zeolitic imidazolate framework (ZIF) particles (etched Zn33Co67-ZIF) exhibiting both micropores and mesopores have been designed and prepared through an ethylene glycol-assisted aqueous etching method. The etching process effectively increases the pore size, surface area, and pore volume of the bimetallic ZIF particles. After the thermal treatment, the etched Zn33Co67-ZIF particles are transformed into cobalt and nitrogen co-doped hierarchically porous carbon (i.e., etched Zn33Co67–C). Etched Zn33Co67–C has an increased mesoporosity, leading to an approximately 45% increase in its specific capacitance compared to the unetched one. In addition, etched Zn33Co67–C displays a higher capacitance retention (67%) than unetched Zn33Co67–C (41%) over a range of scan rates from 1 to 100 mV s−1. The presented ethylene glycol-assisted aqueous etching process provides a facile template-free strategy to enlarge the porosity of MOFs and their corresponding porous carbons for improving their energy storage performance.

Graphical abstract: Enlarging the porosity of metal–organic framework-derived carbons for supercapacitor applications by a template-free ethylene glycol etching method

Supplementary files

Article information

Article type
Paper
Submitted
09 8月 2022
Accepted
01 11月 2022
First published
02 11月 2022

J. Mater. Chem. A, 2023,11, 12759-12769

Enlarging the porosity of metal–organic framework-derived carbons for supercapacitor applications by a template-free ethylene glycol etching method

R. Xin, M. Kim, P. Cheng, A. Ashok, S. Chowdhury, T. Park, A. Alowasheeir, Md. S. Hossain, J. Tang, J. W. Yi, Y. Yamauchi, Y. V. Kaneti and J. Na, J. Mater. Chem. A, 2023, 11, 12759 DOI: 10.1039/D2TA06307G

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