Ultraporous nitrogen-rich carbon nanosheets derived from the synergy of eutectic liquid and zeolitic imidazolate for energy applications

JOURNAL OF POWER SOURCES

卷:434

Article

Wang, Yuan¹  Chen, Xitong²  Zhai, Quan-Guo²  Guo, Jian²  Feng, Pingyun^1,2 

[1] Univ Calif Riverside, Mat Sci & Engn Program, 900 Univ Ave, Riverside, CA 92521 USA

[2] Univ Calif Riverside, Dept Chem, 900 Univ Ave, Riverside, CA 92521 USA

关键词: Ultraporous carbon material;    ZIF derivative;    Carbon dioxide capture;    Oxygen reduction reaction;   

DOI  :  10.1016/j.jpowsour.2019.05.084

来源: Elsevier

【 摘 要 】

Reported here is a unique and novel synthetic method for the preparation of highly porous nitrogen-rich carbon nanosheets from ZIF-8 (ZIF, zeolitic imidazolate framework) with the assistance of eutectic liquid. Due to the low melting temperature, a mixture of eutectic salts can provide a special atmosphere for the carbonization process and function as the template to support the ZIF-8 framework. The formation of the ultraporous nanosheets can be ascribed to the excellent miscibility between the eutectic salts and ZIF-8 framework, thus helping convert the ordered calcined intermediate species into extended carbon sheets at high temperature while inheriting the microporous structure from the prototypical ZIF-8. By controlling the ratio of eutectic liquid to ZIF-8 framework, the BET surface area of carbon nanosheets can be systematically tuned, with the highest BET surface area up to 2960 m(2)g(-1). In addition to this impressive high surface area, the pore size distribution follows well with the pristine ZIF-8. The nitrogen content varies from 9.9 wt % to 13.4 wt %. These characteristics contribute to the excellent performance of CO2 adsorption (5.45 mmol g(-1) at 1 atm and 273K) and oxygen reduction reaction (ORR) catalysis due to the large numbers of accessible active sites.

【 授权许可】

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