# Effect of Silver Promoter on the H2 Gasochromic Recovery Behavior of Pt-Decorated WO3 Nanowires

## TL;DR

This paper shows how adding silver to platinum-decorated tungsten trioxide nanowires improves the speed of hydrogen detection recovery, making it more practical for real-world use.

## Contribution

The novel contribution is the use of silver as a promoter to significantly enhance the recovery kinetics of H2 gasochromic materials.

## Key findings

- Pt-Ag/WO3 nanowires achieved 50% recovery in 52 seconds.
- The recovery time was reduced to one fifth compared to Pt/WO3.
- Ag accelerated oxygen adsorption and dissociation, enabling rapid recovery.

## Abstract

The hydrogen gasochromic phenomenon offers a new strategy for real-time sensing technologies for hydrogen leakage to ensure hydrogen safety. However, the limited recovery kinetics impede the cycling and further practical applications. Herein, we designed a series of PtAg-decorated WO3 nanowires via the chemical reduction deposition method, which could exhibit obvious and reversible color changes for H2 detection. With the assistance of Ag, the oxygen adsorption and dissociation were accelerated; then, the sample could exhibit a constant rapid recovery rate. The crystalline Pt-Ag/WO3 nanowires could attain a 50% recovery degree within 52 s, and the recovery time of the Pt-Ag/WO3 sample was reduced to one fifth that of Pt/WO3. This study provides a fundamental solution to the challenge of slow recovery kinetics in H2 gasochromic crystalline materials.