期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 14, 页码 16418-16426出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c02038
关键词
MOF thin film; nanocomposites; pseudocapacitor; redox hopping; supercapacitor; water-stable MOF
资金
- Ministry of Science and Technology (MOST) of Taiwan [MOST 107-2218-E-006-054-MY3]
- Yushan Young Scholar Program, under Ministry of Education (MOE), Taiwan
- Higher Education Sprout Project, MOE, Taiwan
In this study, nanocrystals of a cerium-based metal-organic framework (Ce-MOF), Ce-MOF-808, are directly grown on the surface of carboxylic acid-functionalized carbon nanotubes (CNTs) via a one-step solvothermal synthesis method. The Ce-MOF-CNT nanocomposites with different ratios are synthesized and characterized. It is found that while the pristine Ce-MOF shows electrochemical activity, its charge transport behavior is limited. The addition of redox-active Ce-MOF-808 nanocrystals significantly enhances the capacitive performance of CNTs in aqueous-based supercapacitors.
In this study, nanocrystals of a cerium-based metal-organic framework (Ce-MOF), Ce-MOF-808, are directly grown on the surface of carboxylic acid-functionalized carbon nanotubes (CNTs) by a facile one-step solvothermal synthesis method. Ce-MOF-CNT nanocomposites with various Ce-MOF-to-CNT ratios are synthesized, and their crystallinity, morphology, porosity, and electrical conductivity are examined. The redox-hopping and electrochemical behaviors of the pristine Ce-MOF in aqueous electrolytes are investigated, suggesting that the pristine Ce-MOF is electrochemically active but possesses a limited charge-transport behavior. As a demonstration, all the Ce-MOF, CNT, and nanocomposites are used as active materials for application in aqueous-based supercapacitors. The capacitive performance of the CNT can be significantly boosted with the help of redox-active Ce-MOF-808 nanocrystals.
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