Electrochemical aspects of sol-gel synthesized MgCoO2 for aqueous supercapacitor and alkaline HER electrocatalyst applications

WITHDRAWN: Twofold ion effect to develop PANI@MgCoO2 nanocomposites for magnesium batteries

“…1. The diffraction pattern of MgCoO 2 displayed sharp Bragg re exions (111), (200), (220) (311) and (222) that are indexed to a cubic structure with a well-established Fm 3m space group, in agreement with previous reports in the literature [21,22]. From the XRD peak positions, we have calculated the lattice parameters as a = b = c = 4.2369 (1) Å, and α = β = γ = 90º.…”

“…The MgCoO 2 material has been scarcely used for battery storage applications, so far. It found applicability in aqueous Li-and Na-ion supercapacitor, alkaline HER electrocatalyst and generation of bioelectricity [21,22]. Its divalent charge character allows achieving a theoretical capacity of 465 mA h g − 1 .…”

Fabrication of High‐Performance MgCoO2/PEDOT:PSS@Nickel Foam Anode for Bioelectricity Generation by Microbial Fuel Cells

“…In Figure 1(a), peaks at 1120, 1360, and 1630 cm −1 are ascribed to the presence of sulfonic acid group of PSS, C-C, and C=C bonds of the thiophene ring, respectively. Characteristic IR band of MgO bond vibration was observed at 510 cm −1 , while O-H due to surface water molecules and CoO in polymer matrix showed bands at 3429 and 421 cm −1 , respectively [19,32,33] (Figure 1(a)). XRD spectra were further used to characterize the synthesised PEDOT:PSS, MgCoO 2 , and MgCoO 2 /PEDOT:PSS nanocomposite samples (Figures 2(a)-2(c)).…”

“…Synthesis of magnesium cobalt oxide (MgCoO 2 ) was carried out in a cost-effective manner by a sol-gel synthesis process as described by Maitra et al [19]. Briefly, 0.5 M MgO and 0.12 M Co(NO 3 ) 2 •6H 2 O were used to prepare 50 mL of the reaction mixture to which triethanolamine (C 6 H 15 NO 3 ) was added dropwise as a chelating agent until the solution turned to pale pink.…”

“…One promising method is to improve the anode's surface properties, and also prepare nanomaterials with complex structures and use them as anodes [16]. Synthesis of modified and doped forms of carbon materials [17], metal/metal oxides, and conducting polymers either in individual or composite forms have been put forward by various researchers to improve the power density, stability, surface area, microbial adhesion, electron transport, biocompatibility, conductivity, corrosion resistance, and electrochemical performance [18] along with cost-effectiveness [4,19,20]. Beside this, recently 3D-nickel (Ni) foam has drawn attention in the construction of anode by being base substratum.…”