Enhanced electrochemical behavior of C@CdS Core-Shell heterostructures

Abstract

The current work presents hydrothermally synthesized carbon@cadmium sulfide core–shell nanostructures with varying carbon nanosphere concentrations. The series is prepared to investigate the shell thickness depending on the concentration of precursors and consequently impacting the optical and electrochemical properties of the core–shell structures. XRD analysis reveals enhanced crystallinity with reduced carbon. SEM & TEM confirm uniform spherical core–shell structures, with optimal uniformity at lower carbon levels. UV–vis spectroscopy demonstrates visible range absorption and reduced band gap with decreased carbon. Electrochemical analysis exhibits diffusion-controlled behavior and Warburg impedance, making the low-carbon sample most suitable for solar cells. Core-shell structures outperform pure carbon samples in absorbance and impedance spectroscopy, showcasing potential for solar cell applications.