Investigation of Hydrogen Gas Sensing Properties of WSe 2 , Ag 2 Se, WSe 2 /Ag 2 Se Nanostructured Electrodes Synthesized by Electrochemical Methods

High Resolution Image Download MS PowerPoint Slide In this study, WSe 2, Ag 2 Se, and WSe 2 /Ag 2 Se nanostructured electrodes were synthesized via an electrochemical deposition method, and their hydrogen gas sensing performances were systematically investigated. The synergistic interaction between WSe 2 nanosheets and Ag 2 Se nanoparticles significantly enhanced charge transport and catalytic activity in the hybrid electrode. Compared to the pristine WSe 2 and Ag 2 Se electrodes, the hybrid electrode exhibited a remarkably higher current response of 7.89 mA cm –2 at 5000 ppm of H 2 and demonstrated stable and reversible sensing behavior over a wide range of hydrogen concentrations (1000–5000 ppm). Analyses of SEM, Raman, and UV–Vis data revealed an increased surface area and improved electronic coupling within the hybrid structure. Furthermore, EIS and OCP measurements confirmed accelerated interfacial charge transfer and superior electrochemical stability. Overall, this study introduces a novel electrochemically synthesized WSe 2 /Ag 2 Se hybrid nanostructure exhibiting excellent sensing performance at low temperatures (25–150 °C) and provides a promising strategy for the development of low-power, highly stable hydrogen gas sensors.