期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 44, 页码 52034-52043出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c09107
关键词
nanoarchitecture; ZIF-8; hollow carbon; hierarchically porous; supercapacitor; capacitive deionization; KOH activation
资金
- Korea Institute of Materials Science (KIMS) [PNK7330]
- National Research Council of Science & Technology (NST), Republic of Korea [PNK7330] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [4199990414483] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The synergistic effects of hollow nano-architecture and high specific surface area of hollow activated carbons (HACs) were reported to significantly enhance the performance of supercapacitors (SC) and capacitive deionization (CDI). By optimizing nanopore distribution and designing large macropores, significant improvements in capacitance and desalination performance can be achieved.
Herein, the synergistic effects of hollow nano-architecture 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.
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