Unraveling the dynamic evolution of PD species on Pd-loaded ZnO nanorods for different hydrogen sensing behaviors

Jian Gao; Baosong Wu; Chenlu Cao; Zili Zhan; Wei Ma; Xiaoxing Wang

doi:10.1021/acssuschemeng.1c00652

Unraveling the dynamic evolution of PD species on Pd-loaded ZnO nanorods for different hydrogen sensing behaviors

Jian Gao, Baosong Wu, Chenlu Cao, Zili Zhan, Wei Ma, Xiaoxing Wang

EMS Energy Institute

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Probing the dynamic evolution of active species under different sensing conditions is achieved to the rational design of sensing materials for outstanding sensing performance. In this study, a palladium (Pd)-loaded ZnO sensing material was approached via the impregnation method. The Pd-loaded ZnO₁₀₀ gas sensor has a better H₂ sensing performance than a pure ZnO gas sensor at an operating temperature of 190 to 360 °C. The in situ Raman and H₂ temperature-programmed surface reaction characterization technologies confirmed that the synergistic effect of metal Pd (Pd⁰) and Pd oxide (PdO_x) played a decisive role in improving the sensing capability for H₂ in low concentrations (less than 100 ppm). The proportion of Pd⁰ in the Pd/PdO_x dynamically increased with the elevation of operating temperature. The small size Pd/PdO_x dispersed on the ZnO surface enhanced the dissociation of H₂ by Pd⁰ and the charge transfer between PdO_x and ZnO, boosting the sensing performance of the gas sensor to H₂. With the increase of the operating temperature to more than 360 °C, H₂ was directly oxidized to gaseous H₂O on the Pd/PdO_x active sites, resulting in a relatively low H₂ sensing capacity. In addition, the change of the appropriate Pd/PdO_x ratio could effectively improve the H₂ sensing performance of the gas sensor.

Original language	English (US)
Pages (from-to)	6370-6379
Number of pages	10
Journal	ACS Sustainable Chemistry and Engineering
Volume	9
Issue number	18
DOIs	https://doi.org/10.1021/acssuschemeng.1c00652
State	Published - May 10 2021

All Science Journal Classification (ASJC) codes

General Chemistry
Environmental Chemistry
General Chemical Engineering
Renewable Energy, Sustainability and the Environment

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10.1021/acssuschemeng.1c00652

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title = "Unraveling the dynamic evolution of PD species on Pd-loaded ZnO nanorods for different hydrogen sensing behaviors",

abstract = "Probing the dynamic evolution of active species under different sensing conditions is achieved to the rational design of sensing materials for outstanding sensing performance. In this study, a palladium (Pd)-loaded ZnO sensing material was approached via the impregnation method. The Pd-loaded ZnO100 gas sensor has a better H2 sensing performance than a pure ZnO gas sensor at an operating temperature of 190 to 360 °C. The in situ Raman and H2 temperature-programmed surface reaction characterization technologies confirmed that the synergistic effect of metal Pd (Pd0) and Pd oxide (PdOx) played a decisive role in improving the sensing capability for H2 in low concentrations (less than 100 ppm). The proportion of Pd0 in the Pd/PdOx dynamically increased with the elevation of operating temperature. The small size Pd/PdOx dispersed on the ZnO surface enhanced the dissociation of H2 by Pd0 and the charge transfer between PdOx and ZnO, boosting the sensing performance of the gas sensor to H2. With the increase of the operating temperature to more than 360 °C, H2 was directly oxidized to gaseous H2O on the Pd/PdOx active sites, resulting in a relatively low H2 sensing capacity. In addition, the change of the appropriate Pd/PdOx ratio could effectively improve the H2 sensing performance of the gas sensor.",

author = "Jian Gao and Baosong Wu and Chenlu Cao and Zili Zhan and Wei Ma and Xiaoxing Wang",

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AU - Gao, Jian

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AU - Zhan, Zili

AU - Ma, Wei

AU - Wang, Xiaoxing

PY - 2021/5/10

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AB - Probing the dynamic evolution of active species under different sensing conditions is achieved to the rational design of sensing materials for outstanding sensing performance. In this study, a palladium (Pd)-loaded ZnO sensing material was approached via the impregnation method. The Pd-loaded ZnO100 gas sensor has a better H2 sensing performance than a pure ZnO gas sensor at an operating temperature of 190 to 360 °C. The in situ Raman and H2 temperature-programmed surface reaction characterization technologies confirmed that the synergistic effect of metal Pd (Pd0) and Pd oxide (PdOx) played a decisive role in improving the sensing capability for H2 in low concentrations (less than 100 ppm). The proportion of Pd0 in the Pd/PdOx dynamically increased with the elevation of operating temperature. The small size Pd/PdOx dispersed on the ZnO surface enhanced the dissociation of H2 by Pd0 and the charge transfer between PdOx and ZnO, boosting the sensing performance of the gas sensor to H2. With the increase of the operating temperature to more than 360 °C, H2 was directly oxidized to gaseous H2O on the Pd/PdOx active sites, resulting in a relatively low H2 sensing capacity. In addition, the change of the appropriate Pd/PdOx ratio could effectively improve the H2 sensing performance of the gas sensor.

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Unraveling the dynamic evolution of PD species on Pd-loaded ZnO nanorods for different hydrogen sensing behaviors

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