Anodic composite deposition of RuO2/reduced graphene oxide/carbon nanotube for advanced supercapacitors. (18th June 2015)

• Record Type: Journal Article
• Authors: Hu, Chi-Chang; Wang, Chia-Wei; Chang, Kuo-Hsin; Chen, Ming-Guan
• Is Part Of: Nanotechnology. Volume 26:Number 27(2015)
• Publication Date: 2015-06-18
• Subjects: ruthenium dioxide -- reduced graphene oxide -- carbon nanotube -- anodic composite deposition -- supercapacitor; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/0957-4484/26/27/274004
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Anodic composite deposition is demonstrated to be a unique method for fabricating a ternary ruthenium dioxide/reduced graphene oxide/carbon nanotube (RuO2 · x H2 O/rGO/CNT, denoted as RGC) nanocomposite onto Ti as an advanced electrode material for supercapacitors. The rGO/CNT composite in RGCs acts as a conductive backbone to facilitate the electron transport between current collector and RuO2 · x H2 O nanoparticles (NPs), revealed by the high total specific capacitance ( C S, T = 808 F g −1 ) of RGC without annealing. The contact resistance among RuO2 · x H2 O NPs is improved by low-temperature annealing at 150 °C (RGC-150), which renders slight sintering and enhances the specific capacitance of RuO2 · x H2 O to achieve 1200 F g −1 . The desirable nanocomposite microstructure of RGC-150 builds up the smooth pathways of both protons and electrons to access the active oxy-ruthenium species. This nanocomposite exhibits an extremely high C S, T of 973 F g −1 at 25 mV s −1 (much higher than 435 F g −1 of an annealed RuO2 · x H2 O deposit) and good capacitance retention (60.5% with scan rate varying from 5 to 500 mV s −1 ), revealing an advanced electrode material for high-performance supercapacitors.