Facile hydrothermal synthesis of flowerlike ZnCo 2 O 4 microspheres as binder-free electrodes for supercapacitors

Fabrication of porous nanosheet-based Co 3 O 4 hollow nanocubes for electrochemical capacitors with high rate capability

“…While pseudocapacitors obtain their great specific capacitances from the fast reversible faradic redox reactions between electrolyte ions and electroactive materials, including transition metal oxides (e.g. NiO, Co 3 O 4 , NiCo 2 O 4 , ZnCo 2 O 4 , Fe 2 O 3 , and MnO 2 ) and conducting polymers [5][6][7][8][9][10][11][12]. Among various electroactive materials, Co 3 O 4 has been suggested as one of the most promising, cost-effective and easily scalable candidates for supercapacitors, due to its excellent redox activity and high theoretical specific capacitance (3560 F g -1 ).…”

Synthesis Characterization of Nanostructured ZnCo2O4 with High Sensitivity to CO Gas

“…Among the p-type semiconductors, zinc cobaltite (ZnCo 2 O 4 ) is a material with spinel-type structure, which has been mainly used as electrode for Li-ion batteries [7][8][9][10][11] and supercapacitors [12][13][14][15], due to its higher electrochemical performances and higher conductivities. To date, sensor devices based on nanostructured spinel ZnCo 2 O 4 have particularly exhibited an excellent sensitivity toward liquefied petroleum gas [16][17][18], ethanol [19,20], acetone [21], Cl 2 [22], formaldehyde [23], and Xylene [24].…”

“…Additionally, several references [18][19][20][21]25] reported its poor sensitivity to carbon monoxide (CO). On the other hand, a variety of synthesis methods have been developed on the preparation of ZnCo 2 O 4 such as combustion [7], thermal decomposition [17], co-precipitation/digestion [18], W/O microemulsion [22], hydrothermal [9,14], sol-gel [26], and surfactant-mediated method [27]. Recently, the colloidal route assisted by microwave radiation has provided an efficient and low cost synthesis method to obtain different types of nanostructured materials [28][29][30][31].…”

Synthesis, Characterization, and Sensor Applications of Spinel ZnCo2O4 Nanoparticles

“…This material has attracted the attention of several research groups due to its potential applications as an electrode for Li-ion batteries [1,2,3,4,5], as a catalyst [6,7,8,9], and in supercapacitors [10,11,12,13]. In the gas sensors field, sensor devices based on ZnCo 2 O 4 nanoparticles have displayed an excellent sensitivity to liquefied petroleum gas [14,15,16,17], H 2 S [18], ethanol [19,20], acetone [21], and formaldehyde [22,23], probably due to their high surface area.…”