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The present work describes a facile route for the synthesis of CdMn2O4 nanoplates. The nanoplates were synthesized by cathodic electrogeneration of base from mixed Cd/Mn nitrate solution (Cd/Mn ratio of 1:2) at a constant current density of 6 mA cm−2 and deposition time of 5 min followed by calcination at 900 °C for 45 min. X-ray powder diffraction (XRD), Fourier-transform infrared (FT-IR), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), and Brunauer-Emmett-Teller (BET) surface area analysis were used to characterize the nanoplates. The charge storage ability and cycle stability of the obtained CdMn2O4 nanostructures were investigated by means of cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS) in 1.0 M KOH. The as-prepared CdMn2O4 nanoplates exhibit high specific capacitance and good retention. The hierarchical CdMn2O4 nanoplates show the highest capacitance of 615.1 F g−1, and 98% of which can still be maintained after 5000 charge-discharge cycles. [ABSTRACT FROM AUTHOR]

A fast and facile electrochemical method called electrooxidation was used to prepare SnO2 nanoparticles. In this route, a sacrificial tin anode is dissolved in an electrolyte by applying a voltage to an electrochemical cell. We used different electrolyte environments, namely tetramethylammonium chloride and different counterions of tetrabutylammonium cation, viz. Br−, Cl−, and ClO4−. Characterization results showed that the size distribution was more uniform for the nanoparticles created with Br− and Cl− counterions. Furthermore, the particles in these samples were smaller than in the others. The amount of OH groups on the surface of the Br− and Cl− samples was higher than for the other samples, enhancing dye adsorption. Dye-sensitized solar cells (DSSCs) were fabricated from the produced SnO2 nanoparticles, and the influence of the different counterions on their performance was investigated. By varying the counterion in the electrolyte, samples with different hydrophilic nature and dye-loading ability were obtained. The dye adsorption and consequently the current density of the cell made from the Br− solution were higher than for the other samples, and the power conversion efficiency in this case reached 1.5%. [ABSTRACT FROM AUTHOR]