Engineering of nickel‐cobalt oxide nanostructures based on biomass material for high performance supercapacitor and catalytic water splitting

Abstract

The purpose of the present study is to report the synthesis of a porous composite constructed from chicken feathers (CF) and nickel and cobalt salts and its application as a new material for modification of positive electrode surface used in supercapacitor as well as hydrogen and oxygen evolution. In this regard, we used waste CF as a biomass precursor and nitrate salts of nickel and cobalt to synthesize a highly porous composite through a solvothermal reaction. After characterization of nanocomposite using different physical and electrochemical techniques, it was used in fabrication of an electrochemical supercapacitor as well as hydrogen and oxygen evolution. The composite demonstrated remarkable electrochemical properties such as fast electrochemical reactions, high conductivity, and high reversibility. In addition, the prepared nanocomposite showed high-specific capacitance of 2000 F g −1 (with current density of 0.5 mA cm −2 or 1 A g −1 ) as a supercapacitor. It also shows high

High‐performance activated carbons for supercapacitor: Effects of porous structures, heteroatom doping, and morphology

“…[3][4][5] SCs can be classified generally into two categories: pseudo-capacitors involving rapid reversible redox reaction 6,7 and electrical double layer capacitors (EDLCs). 8 The former, which is usually based on transition metal oxide [9][10][11][12] or conductive polymer, 13,14 likely provide considerable capacitance, while the low conductivity and poor long-term cyclability limit their applications. The latter, which stores electric energy in electrical double layer, is generally based on activated carbons (ACs), which possess high surface area, porous structure, good conductivity, and excellent electrochemical stability.…”

Hierarchical NiCo / NiO / NiCo 2 O 4 composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

“…18 Among the various candidates, nickel cobaltite (NiCo 2 O 4 ) have received great attention due to their high electrochemical stability, enhanced electrical/ionic conductivity, huge theoretical capacitance, and improved catalytic activity. 19,20 Cobalt and nickel are plentiful earth-abundant materials that seem to be a promising prospect for NiCo 2 O 4 to be an extensively industrialized electrode material owing to its low cost and ecofriendliness. NiCo 2 O 4 is a p-type semiconductor with a bandgap of 2.1 eV, and it has various redox levels and improved electrical conductivity.…”

Synergistic integration of three‐dimensional architecture composed of two‐dimensional nanostructure ternary metal oxide for high‐performance hybrid supercapacitors

“…The high rate capacitance and facile charge storage kinetics of hierarchically structured NCMO microflower were further investigated, measuring the Nyquist plots (Figure 4F). The hierarchically structured NCMO electrode achieves steeper line and smaller charge‐transfer resistance at the low‐ and high‐frequency regions than those of other electrodes 27,48,49 …”

“…The hierarchically structured NCMO electrode achieves steeper line and smaller charge-transfer resistance at the low-and high-frequency regions than those of other electrodes. 27,48,49 On a basis of the CVs at diverse scan rates, the charge storage kinetics is analyzed using the power law relationship 38,42,50 :…”