Ghosh Srija, Bera Sumanta, Kapuria Arijit, Debnath Anup, Das Pratyusha, Su Yan-Kuin, Saha Shyamal K
School of Materials Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India.
Department of Physics, Pachhunga University College, Aizawl, 796001, Mizoram, India.
Nanoscale. 2025 Jul 3;17(26):15731-15748. doi: 10.1039/d4nr05037a.
Considering the huge consumption of fossil fuels and cumulative energy demands in the high-tech society, energy storage devices, particularly supercapacitors, play a pivotal role in exploring alternative sources of renewable energy. To focus on potential supercapacitor electrode materials, they should possess essential features such as a massive surface area, good conductivity, and a plentiful number of active sites. Therefore, the integration of a large surface area of two-dimensional (2D) materials with high conductivity with carbon quantum dots (CQDs) containing a large number of active sites is an elegant approach for achieving excellent electrode materials for supercapacitor applications. In the present work, we decorate highly conducting 2D TiCT MXene sheets with nitrogen (N) and sulfur (S) co-doped CQDs (NS-CQDs) as a source of numerous active sites to explore their potential as electrode materials for supercapacitor applications. We synthesize three samples exhibiting impressive specific capacitances () of 562.7 F g, 725.7 F g, and 523.4 F g, respectively, at a current density of 1 A g with excellent cycling stabilities of 95.5%, 98.3%, and 94.1%, respectively, at a current density of 10 A g over 10 000 cycles. The origin of this excellent is the electron clouds near the N- and S-doped atoms which act as active sites. Finally, these unique hybrid composite materials with high , high energy density (170.34 W h kg at a power density of 1290.98 W kg), and outstanding electrochemical stability show significant promise in the field of storage device applications.
考虑到高科技社会中化石燃料的巨大消耗和累积能源需求，储能设备，特别是超级电容器，在探索可再生能源替代来源方面发挥着关键作用。为了聚焦潜在的超级电容器电极材料，它们应具备诸如大表面积、良好导电性和大量活性位点等基本特征。因此，将具有高导电性的二维（2D）材料的大表面积与含有大量活性位点的碳量子点（CQD）相结合，是获得用于超级电容器应用的优异电极材料的一种巧妙方法。在本工作中，我们用氮（N）和硫（S）共掺杂的碳量子点（NS-CQD）修饰高导电性的二维TiCT MXene片材，作为大量活性位点的来源，以探索它们作为超级电容器应用电极材料的潜力。我们合成了三个样品，在电流密度为1 A g时，分别表现出令人印象深刻的比电容（）为562.7 F g、725.7 F g和523.4 F g，在电流密度为10 A g下经过10000次循环时，分别具有95.5%、98.3%和94.1%的优异循环稳定性。这种优异比电容的来源是N和S掺杂原子附近的电子云，它们充当活性位点。最后，这些具有高比电容、高能量密度（在功率密度为1290.98 W kg时为170.34 W h kg）和出色电化学稳定性的独特混合复合材料在储能设备应用领域显示出巨大的前景。
