Luo Peihui, Guan Xiangfeng, Yu Yunlong, Li Xiaoyan, Yan Fengpo
Organic Optoelectronics Engineering Research Center of Fujian's Universities, College of Electronics and Information Science, Fujian Jiangxia University, Fuzhou 350108, China.
Nanomaterials (Basel). 2019 Feb 4;9(2):201. doi: 10.3390/nano9020201.
Incorporation of new functional components into a three-dimensional graphene (3DG) framework improves the performance of supercapacitors based on 3DG as electrodes by tailoring the framework's structure and properties. In this work, graphene quantum dots (GQDs) were incorporated into 3DG via one-step hydrothermal treatment of GQDs and graphene oxide (GO). By simply adjusting the GQDs/GO feeding ratio by weight, various GQDs/3DG composites were formed. The maximum feeding ratio was 80%, and the prepared composites possessed saturated GQDs loading on the 3DG framework, whereas composites obtained with a GQDs/GO feeding ratio of 40% as electrodes exhibited optimal specific capacitance of 242 F·g for supercapacitors, an increase of 22% compared with that of pure 3DG electrodes (198 F·g). This improved performance was mainly due to better electrical conductivity and larger surface area for GQDs/3DG composites with moderate GQDs content. The fabricated GQDs/3DG composites as electrodes for supercapacitors revealed high electrochemical stability. Their capacitance kept 93% of the initial value after 10,000 charge-discharge cycles.
将新的功能组件融入三维石墨烯（3DG）框架中，通过调整框架的结构和性能，可提高以3DG为电极的超级电容器的性能。在这项工作中，通过对石墨烯量子点（GQDs）和氧化石墨烯（GO）进行一步水热处理，将GQDs融入3DG中。通过简单地按重量调整GQDs/GO进料比，形成了各种GQDs/3DG复合材料。最大进料比为80%，制备的复合材料在3DG框架上具有饱和的GQDs负载量，而以40%的GQDs/GO进料比获得的复合材料作为电极，超级电容器的最佳比电容为242 F·g，比纯3DG电极（198 F·g）提高了22%。这种性能的提高主要归因于具有适度GQDs含量的GQDs/3DG复合材料具有更好的导电性和更大的表面积。制备的GQDs/3DG复合材料作为超级电容器的电极表现出高电化学稳定性。在10000次充放电循环后，其电容保持初始值的93%。
