Ru oxide/carbon nanotube composites for supercapacitors prepared by spontaneous reduction of Ru(VI) and Ru(VII)

Electrochemical capacitive behavior of RuO2/graphene composites prepared under various precipitation conditions

“…(2) are 289.2, 215.5, 528.5, and 358.2 F g À1 , respectively. In agreement with the largest CV area, RG-3 (Ru content: 16.9 atm%) using NaOH as the precipitant achieved the maximum specific capacitance, which is comparable to that of previously reported RuO 2 /graphene composites fabricated through the liquid method [12,14] and better than those of the RuO 2 /CNT composites [30,31]. The relationship of specific capacitance versus discharging current density is shown in Fig.…”

Ruthenium nanoparticles-modified reduced graphene prepared by a green method for high-performance supercapacitor application in neutral electrolyte

“…There are several works related to the preparation of RuO 2 over various carbon materials such as mesoporous carbon, 12 activated carbon, 5 graphene 10,13-17 or carbon nanotubes. 18 However, extra improvement is still required because almost all of the previous RuO 2 -based carbon supercapacitors are limited to operate in either highly acidic or basic electrolytes. This is in order to harvest the benets of the high capacitance value of RuO 2 in spite of the fact that such electrolytes are not targets for the next generation of supercapacitors due to environmental issues.…”

Syntheses of Carbon Nanotube-Metal Oxides Composites; Adsorption and Photo-degradation

“…Various approaches are used to synthesize CNT/MOs composites. This includes hot pressing of composite powder, pressureless sintering technique, direct in-situ growth, in situ CVD synthesis route, high-intensity ultrasonic radiation method, assembling presynthesized metal oxide nanoparticels as building blocks on CNTs, spontaneous formation of metal oxide nanoparticels on CNTs, thermal decomposition of metal oxides precursor directly onto the surface of carbon nanotube, hydrothermal crystallization, sol-gel followed by spark plasma sintering process, surfactant wrapping sol-gel method, chemical precipitation and controlled heteroaggregation method (Liu et al, 2009;Zhang et al, 2010;Keshri et al, 2010;Datye et al, 2010;Zhen et al, 2007;Flahaut et al, 2000;Lupo et al, 2004;Zhang et al, 2006;Gao et al, 2008;Chan et al, 2005;Yang et al, 2009;Estili and Kawasaki, 2008). Over all, the methods based on what is called wet chemistry are perhaps the most widely utilized methods in everyday chemistry.…”