Long-term reliable wireless H2 gas sensor via repeatable thermal refreshing of palladium nanowire

Ki-Hoon Kim, Min-Seung Jo, Sung-Ho Kim, Bokyeong Kim, Joonhee Kang (), Jun-Bo Yoon () and Min-Ho Seo ()
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Ki-Hoon Kim: Pusan National University
Min-Seung Jo: Korea Advanced Institute of Science and Technology (KAIST)
Sung-Ho Kim: Korea Advanced Institute of Science and Technology (KAIST)
Bokyeong Kim: Pusan National University
Joonhee Kang: Pusan National University
Jun-Bo Yoon: Korea Advanced Institute of Science and Technology (KAIST)
Min-Ho Seo: Pusan National University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract The increasing significance of hydrogen (H2) gas as a clean energy source has prompted the development of high-performance H2 gas sensors. Palladium (Pd)-based sensors, with their advantages of selectivity, scalability, and cost-effectiveness, have shown promise in this regard. However, the long-term stability and reliability of Pd-based sensors remain a challenge. This study not only identifies the exact cause for performance degradation in palladium (Pd) nanowire H2 sensors, but also implements and optimizes a cost-effective recovery method. The results from density functional theory (DFT) calculations and material analysis confirm the presence of C = O bonds, indicating performance degradation due to carbon dioxide (CO2) accumulation on the Pd surface. Based on the molecular behavior calculation in high temperatures, we optimized the thermal treatment method of 200 °C for 10 minutes to remove the C = O contaminants, resulting in nearly 100% recovery of the sensor’s initial performance even after 2 months of contamination.

Date: 2024
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DOI: 10.1038/s41467-024-53080-0

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