<i>In Situ</i> TEM Technique Revealing the Deactivation Mechanism of Bimetallic Pd-Ag Nanoparticles in Hydrogen Sensors.
basic_science · Level V
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- Record sourced from PubMed, PMID 35191710.
- Also identified by DOI 10.1021/acs.nanolett.1c05018.
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Abstract
Bimetallic Pd-Ag alloy nanoparticles exhibit satisfactory H<sub>2</sub>-sensing improvements and show application potential for H<sub>2</sub> sensor construction. However, the long-term stability of the H<sub>2</sub> sensor with Pd-Ag nanoparticles as the catalyst is found to dramatically decrease during operation. Herein, gas-cell <i>in situ</i> transmission electron microscopy (TEM) is used to investigate the failure mechanisms of Pd-Ag nanoparticles under operation conditions. Based on the <i>in situ</i> TEM results, the Pd-Ag nanoparticles have two failure mechanisms: particles coalescence at 300 °C and phase segregation at 500 °C. Guided by the failure mechanisms, the H<sub>2</sub> sensor is comprehensively optimized based on the working temperature and the amount of Pd-Ag alloy nanoparticles. The optimized sensor exhibits satisfactory H<sub>2</sub>-sensing properties, and the response decline of the sensor after 1 month is negligible. The revealing of the failure mechanisms with <i>in situ</i> TEM technology provides a valuable route for developing gas sensors with high long-term stability.