KOH-Activated Hollow ZIF-8 Derived Porous Carbon: Nanoarchitectured Control for Upgraded Capacitive Deionization and Supercapacitor

Minjun Kim, Xingtao Xu, Ruijing Xin, Jacob Earnshaw, Aditya Ashok, Jeonghun Kim, Teahoon Park, Ashok Kumar Nanjundan, Waleed A. El-Said, Jin Woo Yi, Jongbeom Na, Yusuke Yamauchi

Research output: Contribution to journalArticlepeer-review

153 Citations (Scopus)

Abstract

Herein, the synergistic effects of hollow nanoarchitecture and high specific surface area of hollow activated carbons (HACs) are reported with the superior supercapacitor (SC) and capacitive deionization (CDI) performance. The center of zeolite imidazolate framework-8 (ZIF-8) is selectively etched to create a hollow cavity as a macropore, and the resulting hollow ZIF-8 (HZIF-8) is carbonized to obtain hollow carbon (HC). The distribution of nanopores is, subsequently, optimized by KOH activation to create more nanopores and significantly increase specific surface area. Indeed, as-prepared hollow activated carbons (HACs) show significant improvement not only in the maximum specific capacitance and desalination capacity but also capacitance retention and mean desalination rates in SC and CDI, respectively. As a result, it is confirmed that well-designed nanoarchitecture and porosity are required to allow efficient diffusion and maximum electrosorption of electrolyte ions.

Original languageEnglish
Pages (from-to)52034-52043
Number of pages10
JournalACS Applied Materials and Interfaces
Volume13
Issue number44
DOIs
Publication statusPublished - 2021 Nov 10

Bibliographical note

Publisher Copyright:
© 2021 American Chemical Society.

All Science Journal Classification (ASJC) codes

  • General Materials Science

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