期刊
CARBON
卷 183, 期 -, 页码 176-186出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.06.072
关键词
Porous carbon nanosheets; Potassium citrate; Intrinsic defects; Supercapacitors; Microwave absorption
资金
- National Natural Science Foundation of China [21908245, 21776308, 52022109]
- Science Foundation of China University of Petroleum, Beijing [2462018YJRC009, 2462020YXZZ016]
- Beijing Municipal Natural Science Foundation [2202047]
A simple and effective strategy was proposed to fabricate porous carbon nanosheets rich in intrinsic defects in a sealed tube, with rationally organized pore structures and uniformly distributed defects.
Rationally introducing intrinsic defects in porous carbon framework is highly desired for extending the utilizing scope of carbon materials, but it remains a challenge. Herein, a simple yet effective strategy has been proposed to fabricate intrinsic defects-rich porous carbon nanosheets in a sealed tube (S-PCN) by using potassium citrate as the only raw material. The interior pressure in the sealed tube induces the formation of intrinsic defects, and the density of defects can be regulated by the volume of sealed tube. The obtained S-PCNs give rationally organized pore structures with uniformly distributed intrinsic defects. Benefitting from the redistributed surface charges, enhanced wettability, and electrochemical surface area, the supercapacitors with optimal S-PCN as the electrodes perform much higher specific capacitances and excellent rate capability, and deliver a high energy density of 5.54 Wh kg(-1) at ultrahigh power density of 50 kW kg(-1). In addition, the high density intrinsic defects can also bring strong polarization loss and balance the impedance matching. As a result, even with an ultralow filler loading of 5 wt%, the optimal S-PCN as electromagnetic waves absorbers exhibits a maximum reflection loss as strong as similar to 58.2 dB, meaning that nearly all the incident microwaves can be effectively consumed. (C) 2021 Elsevier Ltd. All rights reserved.
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