Research Article


2021, 14(11): 3886–3892


Carbon dots modified Ti3C2Tx-based fibrous supercapacitor with photo-enhanced capacitance

Hui Wang1,§, Jingjing Cao1,§, Yunjie Zhou1, Xiao Wang1, Hui Huang1, Yang Liu1 (✉), Mingwang Shao1, and Zhenhui Kang1,2 (✉)

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1 Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, 199 Ren’ai Road, Suzhou 215123, China
2 Macau Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa 999078, Macau SAR, China
§ Hui Wang and Jingjing Cao contributed equally to this work.

Keywords: photo-assisted charging, nitrogen-doped carbon dots, supercapacitor, energy storage
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The energy crisis has always been a widely concerned problem. It is an urgent need for green and renewable energy technologies to achieve sustainable development, and the photo-assisted charging energy storage devices provide a new way to realize the sustainable utilization of solar energy. Here, we fabricated a photo-assisted charging fibrous supercapacitor (NM2P1) with Ti3C2Tx-based hybrid fibre modified by nitrogen-doped carbon dots (NCDs). The NM2P1 fibre provides a volumetric capacitance of 1,445 F·cm−3 (630 F·g−1) at 10 A·cm−3 under photo-assisted charging, which increases by 35.9% than that of dark condition (1,063 F·cm−3/ 464 F·g−1). Furthermore, the NM2P1 fibrous supercapacitor device shows that the maximum volumetric energy density and volumetric power density are 18.75 mWh·cm−3 and 8,382 mW·cm−3. Notably, the transient photovoltage (TPV) test was used to further confirm that NCDs as a photosensitizer enhance the light absorption capacity and faster charge transfer kinetics of NM2P1 fibre. This work directly exploits solar energy to improve the overall performance of supercapacitor, which opens up opportunities for the utilization of renewable energy and the development of photosensitive energy equipment.
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Carbon dots modified Ti3C2Tx-based fibrous supercapacitor with photo-enhanced capacitance. Nano Res. 2021, 14(11): 3886–3892

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