School of Materials Science and Engineering, Anhui University, 111 Jiulong Road, Hefei 230601, China.
School of Chemistry and Chemical Engineering, Anhui University, 111 Jiulong Road, Hefei 230601, China.
Molecules. 2023 Jan 5;28(2):541. doi: 10.3390/molecules28020541.
Carbon materials with pseudocapacitive performance have attracted emerging interest in the energy storage and conversion field. Reduced graphene oxide (r-GO) with superior conductivity and electrochemical stability has been extensively investigated as an efficient capacitive electrode material. In this study, three-dimensional carbon dots (CDs)@r-GO hydrogel electrode was successfully in situ prepared by the one-pot method, where the CDs play a critical role in serving as both reduction agent and electrochemical active sites. With prolonged reaction time, the oxygen content of the CDs@r-GO nanocomposite material could be effectively reduced to ensure better electric conductivity, and the nitrogen content, which provides pseudocapacitance, was gradually increased. The representative two pairs of fast and reversible current peaks appeared in cyclic voltammetry curves, with around three times higher specific capacitance of CDs@r-GO hydrogel electrode (290 F g at the current density of 1 A g in 1 M HSO electrolyte). This simple and mild approach is promising and it is believed it will shed more light on the preparation of high-efficiency and high-performance energy storage materials based on functional reductive CDs.
具有赝电容性能的碳材料在储能和转换领域引起了人们的关注。具有优异导电性和电化学稳定性的还原氧化石墨烯(r-GO)已被广泛研究作为一种有效的电容电极材料。在这项研究中，通过一步法成功原位制备了三维碳点(CDs)@r-GO 水凝胶电极，其中 CDs 起着作为还原剂和电化学活性位点的关键作用。随着反应时间的延长，CDs@r-GO 纳米复合材料的氧含量可以有效地降低，以确保更好的导电性，而提供赝电容的氮含量则逐渐增加。在循环伏安曲线中出现了两对代表性的快速和可逆电流峰，CDs@r-GO 水凝胶电极的比电容高约 3 倍(在 1 M HSO 电解质中 1 A g 的电流密度下为 290 F g)。这种简单温和的方法很有前途，相信它将为基于功能性还原 CDs 的高效、高性能储能材料的制备提供更多的启示。
