Application of multi-active center organic quinone molecular functionalized graphene in fully pseudocapacitive asymmetric supercapacitors. (9th April 2021)

• Record Type: Journal Article
• Authors: Hou, Lijie; Kong, Chao; Hu, Zhongai; Wu, Bowan; Han, Yanxia
• Is Part Of: Nanotechnology. Volume 32:Number 26(2021)
• Publication Date: 2021-04-09
• Subjects: organic molecule electrode -- surpercapacitor -- graphene -- electrochemical reversibility -- non-covalent functionalization; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/abf075
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 5, 7, 12, 14-pentacenetetrone (PT), polycyclic quinone derivatives, are rich in carbonyl, which were investigated as a novel organic electrode material for supercapacitors. PT with a π conjugated system, is a flat molecule, generating strong π – π interactions between molecules. PT molecules were uniformly fixed on conductive reduced graphene oxide (rGO) through π – π interaction by one-step solvothermal method, forming a three-dimensional cross-linked PT@rGO hydrogel. This composite structure was conducive to reducing the charge transfer resistance and promoting the Faraday reaction of electrode, which achieved the superposition of electric double-layer capacitance and pseudocapacitance. Appropriate organic molecular loading can effectively improve electrochemical performance. The optimal PT@rGO electrode material displayed the specific capacitance of 433.2 F g −1 at 5 mV s −1 with an excellent rate capability in 1 mol l −1 H2 SO4 electrolyte. Finally, the fully pseudocapacitive asymmetric supercapacitor has been assembled by using PT@rGO as positive electrode and benz[a]anthracene-7, 12-quinone (BAQ) modified rGO(BAQ/rGO)as negative electrode, which exhibited the good energy storage performance in a cell voltage of 1.8 V.