Superior performance of flexible solid-state supercapacitors enabled by ultrafine graphene quantum dot-decorated porous carbon spheres,New Journal of Chemistry

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Superior performance of flexible solid-state supercapacitors enabled by ultrafine graphene quantum dot-decorated porous carbon spheres
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-07-15 , DOI: 10.1039/d0nj03163a
Yalei Deng _{1,

2,

3,

4} , Yajun Ji _{1,

2,

3,

4} , Fei Chen _{1,

2,

3,

4} , Fuyong Ren _{1,

2,

3,

4} , Shufen Tan _{1,

2,

3,

4}

Affiliation

Graphene quantum dot-decorated porous carbon spheres were synthesized via a facile and green route in this study. The presence of graphene quantum dots modified the conductivity of the resultant materials. Moreover, the obtained self-doped heteroatom carbon material demonstrated a high specific surface area of up to 1393.9 m² g⁻¹. Based on the above merits, the obtained composites reveal superior electrochemical performance for energy storage. The specific capacitance of the composite-based single electrode and assembled flexible solid-state supercapacitors was found to be 237.3 F g⁻¹ and 244.5 mF cm⁻², respectively. Meanwhile, the device's energy density can reach 21.7 μW h cm⁻² at a power density of 674.5 μW cm⁻². Impressively, despite the device's power density of 8000 μW cm⁻², the energy density still remains at 18.8 μW h cm⁻². In addition, the assembled device delivers outstanding flexibility. Even after the device is bent at 154.4°, the energy density maintains a value of 13.7 μW h cm⁻². In brief, a feasible reference for the preparation of functional carbon materials for high-performance energy storage devices was presented via a high efficiency, low cost, and green route.

中文翻译：

超细石墨烯量子点修饰的多孔碳球可实现柔性固态超级电容器的卓越性能

在这项研究中，石墨烯量子点修饰的多孔碳球是通过一种简便且绿色的途径合成的。石墨烯量子点的存在改变了所得材料的电导率。此外，所获得的自掺杂杂原子碳材料显示出高达1393.9m ² g ^-1的高比表面积。基于以上优点，所获得的复合材料显示出优异的电化学性能以用于能量存储。发现基于复合材料的单电极和组装的柔性固态超级电容器的比电容分别为237.3 F g ^-1和244.5 mF cm ^-2。同时，设备的能量密度可以达到21.7μWh cm ^-2在674.5μWcm ^-2的功率密度下。令人印象深刻的是，尽管该设备的功率密度为8000μWcm ^-2，但能量密度仍保持在18.8μWh cm ^-2。此外，组装后的设备具有出色的灵活性。即使在将设备弯曲成154.4°之后，能量密度仍保持在13.7μWh cm ^-2的值。简而言之，通过高效，低成本和绿色途径，提出了用于高性能储能装置的功能性碳材料制备的可行参考。

更新日期：2020-08-17

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