One-step hydrothermal growth of reduced graphene oxide/nickel hexacyanoferrate nanocomposite on Ni foam for binder-free supercapacitor electrode

The synthesis of Ni/Mn hexacyanoferrate microcubes and nanorods for high‐performance asymmetric supercapacitor in neutral electrolyte

“…Remarkably, the areal capacity of Ni/Mn‐HCF/CC decreases only 45% after the charge/discharge current is increased from 10 to 100 mA cm −2 , suggesting its excellent rate capability. It was found that the areal capacity of the electrode materials based on Ni‐HCF decreased around 80% and 95% when the charge/discharge current was increased from 10 mA cm −2 to 60 and 100 mA cm −2 , respectively 47‐49 . For Ni/Mn‐HCF/CC, the dramatic enhancement of rate capability is probably due to the combination of Ni‐HCF and Mn‐HCF.…”

“…It was found that the areal capacity of the electrode materials based on Ni-HCF decreased around 80% and 95% when the charge/ discharge current was increased from 10 mA cm À2 to 60 and 100 mA cm À2 , respectively. [47][48][49] For Ni/Mn-HCF/ CC, the dramatic enhancement of rate capability is probably due to the combination of Ni-HCF and Mn-HCF. (F)…”

“…Recently, the application of transition metal hexacyanoferrates (TM‐HCFs) as the electroactive materials of supercapacitor has also been investigated by many researchers due to their excellent redox reversibility, high ionic conductivity, superior environmental benignancy, low cost, and insolubility upon oxidation/reduction 27‐52 . TM‐HCFs and their numerous composites such as TM‐HCF/carbon‐based nano/micromaterials, 28,37,41,42,46,48 TM‐HCF/TM‐oxides, 33,44,45 TM‐HCF/polymer 35,52 and TM‐HCF/TM‐LDH 53 have been widely used as the positive electrodes of supercapacitors. Theoretically, binary TM‐HCFs such as Ni 2 CoHCF, Co 2 Fe(CN) 6 have higher specific capacitance than unary TM‐HCF because of their much richer oxidation states 35,38 .…”

“…Because of the rich valence states of transition metals (TM), the oxides, 4‐6,9‐11 sulfides, 12‐16 hydroxides 17‐26 of transition metals, and their numerous composites have been widely investigated as the supercapacitor electrode materials of faradic supercapacitor. Recently, the application of transition metal hexacyanoferrates (TM‐HCFs) as the electroactive materials of supercapacitor has also been investigated by many researchers due to their excellent redox reversibility, high ionic conductivity, superior environmental benignancy, low cost, and insolubility upon oxidation/reduction 27‐52 . TM‐HCFs and their numerous composites such as TM‐HCF/carbon‐based nano/micromaterials, 28,37,41,42,46,48 TM‐HCF/TM‐oxides, 33,44,45 TM‐HCF/polymer 35,52 and TM‐HCF/TM‐LDH 53 have been widely used as the positive electrodes of supercapacitors.…”

Nickel hexacyanoferrate/graphene thin film: a candidate for the cathode in aqueous metal-ion batteries

“…4,[13][14][15][16] The use of carbon nanostructures such as graphene or carbon nanotubes (CNTs) for preparing HCM-based nanocomposites increases both the HCM stability and conductivity, allowing a fast charge-discharge process. 15,[17][18][19] Different methodologies have been used to synthesize PB or PBA and their graphene-or carbon nanotube-based nanocomposites, such as co-precipitation, [20][21][22][23] micro-emulsion, 24 sonochemical 17,25 and electrochemical methods. 14,26 Our research group developed an innovative route based on heterogeneous electrochemical reactions between the metallic species present in CNT-or graphene-containing electrodes and soluble metal cyanides in the electrolyte solution.…”