Biomimetic [AV-Er2O3-doped δ-Bi2O3]-stacked nanoplates: an efficient electrocatalyst for OER/HER and electrode material for supercapacitor application

Current investigation explores the role of the phyto-metabolites of the Amaranthus viridis for development of the energy-active nanocomplex. The green route adopted for synthesis of doped nanocomplexes signifies economic viability and ecological convivial. Biomimetically prepared nanoparticles synthesized in different doping concentrations exhibited bandgap in the range of 2.5 to 3.2 eV. Average crystallite sizes of 13.97, 19.64, 16.11, and 11.16 nm were determined through XRD for the doped concentrations of 2.5, 5, 7.5, and 10%, respectively. Synthesized doped nanoparticles exhibit porous sheet-like morphology. The synthesized material was then explored for HER and OER potential through linear sweep voltammetry and electrochemical impedance spectroscopy studies. Overpotential value of 154 mV was obtained for hydrogen evolution reaction and 445 mV for oxygen evolution reaction. Furthermore, highest capacitance of 287 F/g was obtained at 2 mV/s through cyclic voltammetry.

Automated summary

The study investigates the role of phyto-metabolites of Amaranthus viridis in the development of energy-active nanocomplex. The synthesis of doped nanocomplexes using a green route shows economic viability and ecological friendliness. The biomimetically prepared nanoparticles with different doping concentrations exhibit a bandgap range of 2.5 to 3.2 eV. XRD analysis reveals average crystallite sizes of 13.97, 19.64, 16.11, and 11.16 nm for doping concentrations of 2.5, 5, 7.5, and 10%, respectively. The synthesized doped nanoparticles have a porous sheet-like morphology. The material shows promising potential for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with overpotential values of 154 mV and 445 mV, respectively. Cyclic voltammetry demonstrates the highest capacitance of 287 F/g at 2 mV/s.