Gamma radiation induced synthesis of Ag decorated NiMn2O4 nanoplates with enhanced electrochemical performance for asymmetric supercapacitor

Highly flexible hybrid devices enabled by Ag-decorated ZnCo2O4 electrodes

Electrode materials with excellent performance are the basis for designing supercapacitors with outstanding stability and high specific capacitance. In this work, we prepared a type of ZnCo2O4 nanosheet structure with Ag nanoparticles through a multi-step hydrothermal strategy. The as-fabricated composite presented a specific capacity of 2540 F g-1 at 1 A g-1 due to the synergetic effect of its components and structure. The three-dimensional structure enabled the material to maintain an initial specific capacitance of 92.5% after 10 000 cycles. The asymmetric supercapacitor delivered an energy density of 72.36 W h kg-1 at a power density of 10 800 W kg-1. Moreover, it demonstrated 89% capacitance retention at 5 A g-1 after 10 000 cycles even when the operating temperature decreased to 0 °C.

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

A flexible nanocomposite film based on polyvinyl alcohol (PVA), silver nanoparticles, and calcium titanate (CaTiO₃) was synthesized using gamma radiation induced-reduction. Temperature-dependent structural, optical, DC electrical conductivity, electric modulus, and dielectric properties of PVA/Ag/CaTiO₃ nanocomposite film were investigated. The XRD pattern proved the successful preparation of the nanocomposite film. Also, as the temperature increases, the average crystallite sizes of CaTiO₃ and Ag nanoparticles decrease from 19.8 to 9.7 nm and 25 to 14.8 nm, respectively. Further, the optical band gap increased from 5.75 to 5.84 eV with increasing temperature. The thermal stability is improved, and the semiconductor behavior for PVA/Ag/CaTiO₃ nanocomposite film is confirmed by thermal activation energy ΔE with values in the 0.11-0.8 eV range. Furthermore, the maximum barrier W_m value was found of 0.29 eV. PVA/Ag/CaTiO₃ nanocomposite film exhibits a semicircular arc originating from the material's grain boundary contributions for all temperatures. The optical, DC electrical conductivity, and dielectric properties of the PVA/Ag/CaTiO₃ nanocomposite film can be suitable for flexible electronic devices such as electronic chips, optoelectronics, and energy storage applications.