All-solid-state flexible supercapacitor using graphene/g-C3N4 composite capacitor electrodes

• Published in: Journal of materials science Vol. 55; no. 34; pp. 16334 - 16346
• Main Authors: Qu, Yuanduo, Zhang, Xueyu, Lü, Wei, Yang, Nianjun, Jiang, Xin
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2020; Springer Nature B.V
• Subjects: Atomic interactions; Capacitance; Carbon fibers; Carbon nitride; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Crystallography and Scattering Methods; Electrodes; Electronic devices; Energy Materials; Flux density; Graphene; Materials Science; Metal oxides; Particulate composites; Polymer Sciences; Solid Mechanics; Solid state; Supercapacitors
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-020-05156-7

Flexible supercapacitors using graphene have been intensively investigated due to their potential applications for wearable and smart devices. In order to avoid stacking between graphene layers, spacers such as carbon fibers and metal oxide particles are often introduced. Such composites enhance effectively the specific surface area of the electrodes and eventually supercapacitor performance. In present work, the graphene/g-C 3 N 4 composite is fabricated and further employed as the supercapacitor electrode. The atomic interaction between C and N of g-C 3 N 4 and O of graphene oxide during the post-reduction in graphene oxide is found to affect device performance. The devices fabricated using the graphene/g-C 3 N 4 composite electrode exhibit a specific area capacitance of 1500 mF cm −2 , and 95% of initial capacitance after 5000 cycles and a maximum energy density of 0.075 mWh cm −2 . These all-solid-state flexible supercapacitors are thus promising for miniaturized electronics.