Cobalt monoxide-doped porous graphitic carbon microspheres for supercapacitor application

Abstract

A novel design and facile synthesis process for carbon based hybrid materials, i.e., cobalt monoxide (CoO)-doped graphitic porous carbon microspheres (Co-GPCMs), have been developed. With the synthesis strategy, the mixture of cobalt gluconate, α-cyclodextrin and poly (ethylene oxide)106-poly (propylene oxide)70-poly (ethylene oxide)106 is treated hydrothermally, followed by pyrolysis in argon. The resultant Co-GPCMs exhibits a porous carbon matrix with localized graphitic structure while CoO nanodots are embedded in the carbon frame. Thus, the Co-GPCMs effectively combine the electric double-layer capacitance and pseudo-capacitance when used as the electrode in supercapacitor, which lead to a higher operation voltage (1.6 V) and give rise to a significantly higher energy density. This study provides a new research strategy for electrode materials in high energy density supercapacitors.

Molecular-based design and emerging applications of nanoporous carbon spheres

“…Catalytic graphitization is gaining particular attention because of its industrial feasibility. So far, a variety of Fe-, Co-, Ni-and Mn-containing species have been used as graphitization catalysts for the synthesis of graphitic carbons (Table 1) 72,73 . For instance, micrometre-sized uniform hollow spheres with graphitized carbon shells were prepared by carbonization of polymer spheres through lysine-catalysed polymerization of dihydroxybenzoic acid and formaldehyde in ethanol in the presence of iron species 72 .…”

Hydrothermal Self-assembly of Manganese Dioxide/Manganese Carbonate/Reduced Graphene Oxide Aerogel for Asymmetric Supercapacitors

“…Nowadays, one promising strategy to enhance the specific capacitance is to combine carbon materials (such as active carbon, CNTs and graphene) with transition metal oxides (such as RuO 2 , NiO, Co 3 O 4 , and MnO 2 ) [6][7][8][9][10][11]. Graphene, as an individual two dimensional carbon material, has become one of the hottest materials for supercapacitor applications in the past few years, owing to its high electrical conductivity, large surface area and good chemical stability [12,13].…”

One-pot synthesis of composite NiO/graphitic carbon flakes with contact glow discharge electrolysis for electrochemical supercapacitors

“…0.20 V potential range, the CVs show a wide separation between the positive and negative current responses, manifesting in a quasi-rectangular shape characteristic for double-layer capacitance and originating from the graphitic material. This implies that our material combines both the electric double-layer capacitive behavior of carbon and faradic response of NiO [20]. The average mass specific capacitance, calculated from the CV curves as c ¼ ∫I V ð ÞdV mνΔV , with the numerical integration of the current being over the half-cycle potential window 0-0.5 V, m the mass of the deposited material, and ν the potential scan rate, is plotted in Figure 5(c) with respect to the voltage scan rate.…”

“…This leads to both high capacitance values and larger range for the operating cell voltage [3]. The alternative is to form composite materials of pseudocapacitive transition metal oxides with conductive carbonaceous additives [20][21][22][23]. As a result, dissipation of excess energy with charge/discharge cycles into Joule heating may make the electrochemical device unstable.…”

“…As a result, dissipation of excess energy with charge/discharge cycles into Joule heating may make the electrochemical device unstable. The alternative is to form composite materials of pseudocapacitive transition metal oxides with conductive carbonaceous additives [20][21][22][23].…”