Tenkayala Navya Kumari, Maity Chandan Kumar, Moniruzzaman Md, Devaraju Subramani
Department of Chemistry, Vignan Foundation for Science, Technology and Research (Deemed to be University), Guntur, 522213, India.
Department of Chemistry, Mallareddy college of Engineering and Technology, Maisammaguda, Dhulapally, Secundrabad, Telangana, 500100, India.
Beilstein J Nanotechnol. 2025 Jun 24;16:933-943. doi: 10.3762/bjnano.16.71. eCollection 2025.
Herein, biowaste- (from leaves) derived carbon dots (CDs) have been utilized as a mediator for the production of silver nanoparticles (PG-CDs-AgNPs) as a superior supercapacitor electrode. The methodology presented here is inexpensive and environmentally friendly as CDs play a role as capping, reducing, and stabilizing agent without addition of any chemicals. PG-CDs-AgNPs showed a particle size of 10 nm having excellent fluorescence emission in the blue region, and it has been explored as an electrode material for supercapacitor applications. The as-synthesized PG-CDs-AgNPs electrode exhibited the maximum specific capacitance of 540 F/g in a three-electrode study. The asymmetric supercapacitor (ASC) device with PG-CDs-AgNPs as the positive electrode reached the maximum specific capacitance of 200 F/g having a superior energy density of 71 W·h/kg at 1.5 A/g. Even at a high current density of 4 A/g, the ASC device reached a specific capacitance of 175 F/g, reinforcing its capability. The method described here provides a straightforward green approach towards biowaste-derived CD-mediated synthesis of AgNPs to produce efficient supercapacitor electrodes for energy storing.
在此，利用源自生物废料（树叶）的碳点（CDs）作为媒介来制备银纳米颗粒（PG-CDs-AgNPs），将其作为一种优异的超级电容器电极。此处介绍的方法既经济又环保，因为碳点在不添加任何化学物质的情况下起到了封端、还原和稳定剂的作用。PG-CDs-AgNPs的粒径为10纳米，在蓝色区域具有出色的荧光发射，并且已被探索用作超级电容器应用的电极材料。在三电极研究中，合成的PG-CDs-AgNPs电极表现出540 F/g的最大比电容。以PG-CDs-AgNPs作为正极的不对称超级电容器（ASC）装置在1.5 A/g时达到了200 F/g的最大比电容，具有71 W·h/kg的优异能量密度。即使在4 A/g的高电流密度下，ASC装置的比电容也达到了175 F/g，增强了其性能。本文所述方法为生物废料衍生的碳点介导合成银纳米颗粒以生产用于能量存储的高效超级电容器电极提供了一种直接的绿色方法。
