Hydrogen sensing and mechanism of M-doped SnO2 (M = Cr, Cu and Pd) nanocomposite |
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| Authors: | Wen Zeng Tianmo Liu DeJun Liu ErJing Han[Author vitae] |
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| Affiliation: | aCollege of Materials Science and Engineering, Chongqing University, Chongqing 400030, China;bNational Engineering Research Center for Magnesium Alloys, Chongqing 400030, China |
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| Abstract: | The microstructure of M-doped SnO2 (M = Cr3+, Cu2+ and Pd2+) prepared by the sol–gel method and their gas-sensing performance were investigated. In particular, we focus on the effects of metallic ions on the hydrogen sensing behavior of the SnO2-based sensor. It is found that hydrogen gas response of SnO2 can be enhanced evidently by adding Pd2+, while such effect from Cr3+ and Cu2+ exhibits somewhat slight. A theoretical study based on first principles calculation shows that SnO2–Pd (1 1 0) surface enable adsorb more H2 gas and receive larger electrons from adsorbed H2 molecule, thereby holding the potential for the improvement of gas response to hydrogen. |
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| Keywords: | SnO2 Hydrogen sensing First principles |
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