Effect of cation substitution on the pseudocapacitive performance of spinel cobaltite MCo₂O₄ (M = Mn, Ni, Cu, and Co)

Abstract

Cation substitution is a promising strategy for modulating the structural properties and optimizing the electrochemical performance of spinel cobalt oxide (Co3O4); however, the underlying mechanism of this action induced by different cation substitutions has not yet been clearly addressed.

Metal‐Organic‐Framework‐Derived MCo2O4 (M=Mn and Zn) Nanosheet Arrays on Carbon Cloth as Integrated Anodes for Energy Storage Applications

“…No second phases, such as Mn 3 O 4 were observed, suggesting that the materials prepared are pure Co‐based spinel metal oxides. This is in consistent with the results of previous reports . Figures d–e depicted the TEM image of a single MnCo 2 O 4 nanosheet, composed of many interconnected nanoparticles with diameters of ≈10 nm.…”

“…This is in consistent with the results of previous reports. [26][27][28] can be clearly observed. Together with the XRD pattern, HRTEM image and EDS spectra, the results confirmed the formation of pure MnCo 2 O 4 nanosheets after calcinating the MnÀ CoÀ MOF@CC nanosheet arrays at 350°C.…”

Nickel hydroxide/chemical vapor deposition-grown graphene/nickel hydroxide/nickel foam hybrid electrode for high performance supercapacitors

“…In order to obtain the optimized electrochemical performance, the mass ratio of the positive to negative materials is set to 0.21 in the assembled Ni(OH) 2 /G/Ni(OH) 2 /NF//AC/NF hybrid device according to the specific capacitance calculated from their CV curves (Fig. 5b) by using the charge balance theory [56]. Fig.…”

In Situ Growth of Zeolitic Imidazolate Framework‐67‐derived Nanoporous Carbon@K0.5Mn2O4 for High‐Performance 2.4 V Aqueous Asymmetric Supercapacitors

“…[4] At present, supercapacitors (SCs) are regarded as promising candidates to fulfill the market requirements because of their long cycle lifetimes( > 10 5 ), fast charge-discharge processes (within seconds) and high power density;t he only drawback of SCs is their low energy density. [6] For aqueous electrolytes, the potentialw indow of symmetric supercapacitors is only approximately 1.0 V, and even asymmetric supercapacitors can only achieveavoltage of 2.0 V. [7][8][9][10][11] This is owing to the theoretical decomposition voltage of water (1.23 V). According to the energy density equation E = 1/2 CV 2 ,t he low energy density (E)o fs upercapacitors can be improved by increasinge ither the specific capacitance( C)o rc ell voltage (V).…”

“…According to the energy density equation E = 1/2 CV 2 ,t he low energy density (E)o fs upercapacitors can be improved by increasinge ither the specific capacitance( C)o rc ell voltage (V). [6] For aqueous electrolytes, the potentialw indow of symmetric supercapacitors is only approximately 1.0 V, and even asymmetric supercapacitors can only achieveavoltage of 2.0 V. [7][8][9][10][11] This is owing to the theoretical decomposition voltage of water (1.23 V). [12] Further broadening of the potential window of supercapacitors in aqueous electrolytes beyond 2.0 Vi ss till as ignificant challenge.…”