双金属片
纳米颗粒
材料科学
合金
聚结(物理)
原位
透射电子显微镜
纳米技术
催化作用
氢
化学工程
金属
冶金
化学
物理
工程类
天体生物学
有机化学
生物化学
作者
Xueqing Wang,Ming Li,Pengcheng Xu,Ying Chen,Haitao Yu,Xinxin Li
出处
期刊:Nano Letters
[American Chemical Society]
日期:2022-02-22
卷期号:22 (7): 3157-3164
被引量:23
标识
DOI:10.1021/acs.nanolett.1c05018
摘要
Bimetallic Pd-Ag alloy nanoparticles exhibit satisfactory H2-sensing improvements and show application potential for H2 sensor construction. However, the long-term stability of the H2 sensor with Pd-Ag nanoparticles as the catalyst is found to dramatically decrease during operation. Herein, gas-cell in situ transmission electron microscopy (TEM) is used to investigate the failure mechanisms of Pd-Ag nanoparticles under operation conditions. Based on the in situ 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 H2 sensor is comprehensively optimized based on the working temperature and the amount of Pd-Ag alloy nanoparticles. The optimized sensor exhibits satisfactory H2-sensing properties, and the response decline of the sensor after 1 month is negligible. The revealing of the failure mechanisms with in situ TEM technology provides a valuable route for developing gas sensors with high long-term stability.
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