# Investigation of Hydrogen Gas Sensing Properties of WSe2, Ag2Se, WSe2/Ag2Se Nanostructured Electrodes Synthesized by Electrochemical Methods

## TL;DR

Researchers developed a new hybrid nanostructure sensor that detects hydrogen gas efficiently at low temperatures.

## Contribution

A novel WSe2/Ag2Se hybrid nanostructure was electrochemically synthesized for enhanced hydrogen sensing performance.

## Key findings

- The hybrid electrode showed a current response of 7.89 mA cm–2 at 5000 ppm H2.
- The hybrid structure demonstrated stable and reversible sensing behavior across 1000–5000 ppm H2.
- SEM, Raman, and UV–Vis analyses confirmed improved surface area and electronic coupling in the hybrid structure.

## Abstract

In this study, WSe2, Ag2Se, and
WSe2/Ag2Se nanostructured electrodes were synthesized
via
an electrochemical deposition method, and their hydrogen gas sensing
performances were systematically investigated. The synergistic interaction
between WSe2 nanosheets and Ag2Se nanoparticles
significantly enhanced charge transport and catalytic activity in
the hybrid electrode. Compared to the pristine WSe2 and
Ag2Se electrodes, the hybrid electrode exhibited a remarkably
higher current response of 7.89 mA cm–2 at 5000
ppm of H2 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 WSe2/Ag2Se 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.