Cobalt Oxide Aerogels of Ideal Supercapacitive Properties Prepared with an Epoxide Synthetic Route

Abstract

Figure S1. The TG analysis of the as-prepared aerogel. The weight loss below 200 o C was attributed to the removal of the physisorbed water and solvent, and the weight loss above 200 o C was caused by the conversion reaction to Co 3 O 4 .

Hierarchically Porous Carbon with Manganese Oxides as Highly Efficient Electrode for Asymmetric Supercapacitors

“…[1][2][3][4][5] Differently from LIBs, which can provide large energy density, ECs offer transient, but ultrahigh power, long cycle life, and short charge/discharge duration, while providing a relatively low energy supply for the time-dependent needs of systems. To improve this drawback, transition-metal oxides, including ruthenium oxides (RuO 2 ), [6] cobalt oxides (CoO x ), [7][8][9] nickel oxides (NiO x ), [10,11] vanadium oxides (V 2 O 5 , VO x ), [12,13] and manganese oxides (MnO 2 , Mn 3 O 4 ) [14] have been employed as alternatives to replace activated carbons because these materials can provide not only double-layer capacitances, but also high pseudocapacitances derived from highly reversible surface Faradic reactions. [8,12,[15][16][17][18][19] Among the transition-metal oxides adopted, manganese oxides have been considered as promising materials for ECs because of their low cost, high theoretical capacitance, ideal capacitive response, and environmental friendliness.…”

“…To improve this drawback, transition-metal oxides, including ruthenium oxides (RuO 2 ), [6] cobalt oxides (CoO x ), [7][8][9] nickel oxides (NiO x ), [10,11] vanadium oxides (V 2 O 5 , VO x ), [12,13] and manganese oxides (MnO 2 , Mn 3 O 4 ) [14] have been employed as alternatives to replace activated carbons because these materials can provide not only double-layer capacitances, but also high pseudocapacitances derived from highly reversible surface Faradic reactions. [8,12,[15][16][17][18][19] Among the transition-metal oxides adopted, manganese oxides have been considered as promising materials for ECs because of their low cost, high theoretical capacitance, ideal capacitive response, and environmental friendliness. [20][21][22][23] A previous study showed that a ultrathin layer of manganese oxide (5 mg) onto a Pt electrode could provide the theoretical specific capacitance of 1380 F g À1 .…”

The specific capacitance of sol–gel synthesised spinel MnCo2O4 in an alkaline electrolyte

“…Among metal oxides, Co oxides are normally reported to 30 have high redox activity and good reversibility, but specific capaci-31 tance is relatively low [4]. Some Co-based oxides or Co hydroxides 32 have been reported to exhibit high specific capacitance [5][6][7]. How-33 ever, carbon nanotube or nanofiber seems to be one important 34 reason in improving their specific capacitance.…”

Electrochemically Fabricated Nanostructures in Energy Storage and Conversion Applications

“…Specifically, one-dimensional (1D) nanostructured materials, e.g., nanotubes (NTs) or nanowires (NWs), fabricated directly on to a substrate may eliminate the use of ancillary materials and increase the active surface area as well as the energy capacity of the electrodes. In recent years, there has been extensive research in developing alternative pseudocapacitor electrode materials, such as cobalt oxide [6], manganese oxide [7,8], nickel hydroxide [9] and nickel oxide [10][11][12][13], either as porous and/or one-dimensional (1D) nanostructures. Due to its low cost, high specific capacitance, and good capacity retention, NiO is one of the most promising materials [4].…”