Supercapacitive carbon nanotube-cobalt molybdate nanocomposites prepared via solvent-free microwave synthesis

Abstract

Cobalt molybdate (CoMoO 4 ) nanoplatelets with a crystalline-amorphous core-shell structure anchored via multiwalled carbon nanotubes were prepared by a solvent-free microwave synthesis method. The entire procedure took only 15 min. The nanocomposite shows a promising capacitance of 170 F g 21 with a potential window of 0.8 V, degrading by only 6.8% after 1000 cycles.

Role of polymeric surfactant in the synthesis of cobalt molybdate nanospheres for hybrid capacitor applications

“…These nanowires were reported to have larger surface area and defects that promoted good electron transport and efficient electrochemical reactions [1]. A CoMoO 4 nanoplate exhibiting a capacitance of 170 F g -1 over 1000 cycles has been also reported [16]. In another work, CoMoO 4 nanoplates synthesised via hydrothermal route has shown specific capacitance of 1.26 F cm -2 .…”

“…ESR value for modified electrode is almost 2 Ω cm -2 whereas the pure sample value is 29 Ω cm -2 . The lower value indicates faster chargedischarge ability of modified electrode than that of pure sample [16]. …”

“…Due to these specifications, a lot of efforts have been made to study the possibility of using metal molybdates in energy storage devices [6][7][8][9], [16][17][18][19][20]. Among various molybdate materials, MnMoO 4 /CoMoO 4 heterostructured nanowires showed specific capacitance of 187 F g -1 at current density of 1 A g -1 with an excellent reversibility after 1000 cycles.…”

Facile and large scale combustion synthesis of α-CoMoO4: Mimics the redox behavior of a battery in aqueous hybrid device

“…In recent years, transition metal molybdates (MMoO 4 , M = Mn, Co, Ni, Cu and Fe) have attracted interest in the field of energy storage devices, such as Li-ion batteries [1][2] and supercapacitors [3][4][5][6][7][8]. This interest is primarily due to the electrochemical properties of the active metal ions in the chemically stable molybdate structure, and the pseudocapacitive and semiconducting nature of the material [1][2][3][4][5][6][7][8].…”

Synthesis, crystal structure and pseudocapacitor electrode properties of γ-Bi2MoO6 nanoplates

“…Recently, metal molybdate (MMoO 4 and M 2 O 3 .nMoO 3 , M = metal) based electrodes have received significant interest in Li-ion batteries and supercapacitors due to their stable crystal structure and redox behaviour of metals (Ni, Co and Mn) in aqueous alkali electrolytes [5][6][7][8][9][10][11][12][13][14][15]. Especially, heterostructured MnMoO 4 /CoMoO 4 nanowires showed a SC of 187.1 F g -1 and excellent cycling stability [10].…”