Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Synthesis and Oxidation Behavior of Pd-Ir@CeO2 Core-shell Nanoparticles for Hydrogen Gas Sensor

  • Gi-Seung Shin (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Dong-Seog Kim (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Tuong Van Tran (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Geun-Jae Oh (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University) ;
  • Seok-Yong Hong (ALLIX, Inc.) ;
  • Ho-Geun Song (Ogam technology Co.) ;
  • Yeon-Tae Yu (Division of Advanced Materials Engineering, Research Center for Advanced Materials Development, Jeonbuk National University)
  • Received : 2024.08.20
  • Accepted : 2024.09.16
  • Published : 2024.09.30
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Abstract

Currently, numerous studies are being conducted on metal oxide semiconductor (MOS) gas sensors for hydrogen detection, using Palladium (Pd) and Pd-based alloy nanoparticles (NPs) owing to their hydrogen absorption ability. Furthermore, several studies have reported that Pd-Iridium (Ir) alloys possess high hydrogen absorption capabilities in their bulk state. However, Ir growth is limited to above 2 nm and it does not mix extensively with other metals. Furthermore, as the hydrogen absorption capacity decreases with the reduction in particle size, it is necessary to synthesize nanoparticles of an appropriate size. Therefore, the synthesis of Pd-Ir alloy NPs larger than 10 nm is challenging. In this study, we report the synthesis of Pd-Ir NPs with an average diameter of 19 nm using a hydrothermal technique for the first time and fabricated Pd-Ir alloy NPs through calcination at 500℃ in Ar and air. To confirm alloy formation and oxidation behavior, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were performed. In addition, we synthesized Pd-Ir@CeO2 core-shell nanoparticles (CSNPs) as hydrogen gas-sensing materials. The Pd-Ir core was partially oxidized during heat treatment at 500℃ in air, and Pd-Ir@CeO2 CSNPs were finally changed into Pd-Ir(alloy)/PdO-IrO2@CeO2 CSNPs, which exhibited higher sensitivity and selectivity toward H2 gas compared to totally oxidized PdO-IrO2@CeO2 CSNPs and pure CeO2 NPs. The enhanced gas-sensing performance was attributed to the hydrogen absorption effect of the Pd-Ir(alloy) NPs.

Keywords

Acknowledgement

This work was supported by 1) BK21-FOUR programs of the Ministry of Education and Human-Resource Development, South Korea; 2) National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (2021R1A2C2008447); 3) "Regional Innovation Strategy (RIS)" through the National Research Foundation of Korea(NRF) funded by the Ministry of Education (MOE) (2023RIS-008).

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