Facile preparation of porous Cu, Ni, and Cu–Ni alloy as electrodes for supercapacitor application

Alloy/Perovskite Compounds Modified by Plasma Treatment and their Role in Enhancing the Capacitance of Sustainable Graphene Supercapacitors

“…Using metal alloys in supercapacitors offer several physicochemical advantages, including: 1) High conductivity, which decreases the internal resistance in the devices and facilitates the ion diffusion/extraction in the SC electrodes, 2) redox activity: alloys contain several elements (Cu, Fe, Mn, In, Ga, Sn) that can be used as redox centers for the charge storage, 3) high structural stability, which allows a high number of charging/discharging cycles in the devices and 4) resistance to corrosion. [23,24] It has been reported some alloys with capacitive properties: NiÀ Co alloy (506 F g À 1 at 1 A g À 1 in 1 M KOH), [25] Cu 64 Ni 36 alloy (610 F g À 1 at 1 A g À 1 in 2 M KOH), [26] MnÀ Co alloy (1175 F g À 1 at 0.5 A g À 1 in 1 M KOH), [27] bimetallic Ni 0.61 Co 0.39 alloy (1523 F g À 1 at 2 A g À 1 in 2 M KOH), [28] and ternary NiMnCo alloy (2980 F g À 1 at 6 A g À 1 in 6 M KOH). [29] Despite their high capacitances, there are scarce reports about the use of magnetic alloys in solid state SCs.…”

The Use of NiFe2O4 and CoFe2O4 Nanoparticles Produced by Green Synthesis as Electrode Material for Supercapacitors

“…[31] While supercapacitor electrodes consisting of transition metal compounds have been shown to exhibit pseudocapacitance-like phenomena, chemical adsorption and desorption through redox mechanisms occur between the electrolyte and electrode system. [31,32] A new way to make carbon supercapacitor electrodes is to use waste materials from farming, like sugar cane bagasse, [33] used coffee beans, [34] corn grains, [35] banana fibers, [36] and willow catkins. [37] Electric double-layer capacitors are affected by the number of pores, the size of the carbon surface, how well electricity flows through it, and the presence of electrochemically active surface functional groups.…”

“…To improve the energy and power densities of electrochemical double‐layer capacitors, researchers have invested great effort in studying pseudocapacitive metal oxides [41] . Nickel‐based electrodes have been regarded as the most promising materials among the various transition metals because they have a greater theoretical specific capacitance, are inexpensive, ecologically acceptable, and are accessible [28,32] . Numerous metallic alloys containing nickel have recently been created and are being researched for use in supercapacitors [28] .…”

“…[41] Nickel-based electrodes have been regarded as the most promising materials among the various transition metals because they have a greater theoretical specific capacitance, are inexpensive, ecologically acceptable, and are accessible. [28,32] Numerous metallic alloys containing nickel have recently been created and are being researched for use in supercapacitors. [28] To make and study supercapacitor materials, people mostly work with Ni-Co layered double hydroxide and their composites with porous carbon, [42] porous Co-Ni layered double hydroxide nanosheets, [29] carbon coated Ni-Mn, [43] and Ni-Fe and Ni-Fe/Ni-Zn.…”

“…The electric double‐layer process for charge storage used in carbon‐based electrode supercapacitors is based on the electrostatic adsorption and desorption of ions and charges on the interface of the electrolyte and carbon electrode systems during charging and discharging, respectively [31] . While supercapacitor electrodes consisting of transition metal compounds have been shown to exhibit pseudocapacitance‐like phenomena, chemical adsorption and desorption through redox mechanisms occur between the electrolyte and electrode system [31,32] …”