Understanding the structural evolution of Au/WO2.7 compounds in hydrogen atmosphere by atomic scale in situ environmental TEM

Abstract

Hydrogen energy is a resuscitated clean energy source and its sensitive detection in air is crucial due to its very low explosive limit. Metal oxide decorated with noble metal nanoparticles has been used for the enhancement of gas detection and exhibits superior sensitivity. Understanding the intrinsic mechanism of the detection and the enhancement mechanism is thus becoming a fundamental issue for the further development of novel metal/oxide compound gas-sensing materials. However, the correlation between the microstructural evolution, the charge transport and the complex sensing process has not yet been directly revealed and its atomic mechanism is still debatable. In this study, an Au/WO2.7 compound was synthesized and exhibited a strongly enhanced gas sensitivity to many reductive gases, especially H2. Aberration-corrected environmental transmission electron microscopy was used to investigate the atomic-scale microstructural evolution in situ during the reaction between H2 and Au/WO2.7 compound. Swing and sintering processes of the Au particles on the WO2.7 surface were observed under heating and gaseous environments, and no injection of hydrogen atoms was suggested. First principle calculations verified the swing and sintering processes, and they can be explained by the enhancement of H2 sensitivity.

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Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (Nos. 51988101, 91860202 and 51872008), the Beijing Natural Science Foundation (No. Z180014), the “111” project under the DB18015 grant and the Beijing Outstanding Young Scientists Projects (No. BJJWZYJH01201910005018). The authors thank Dr. Dongchang Wu from Thermofisher Scientific Shanghai Nanoport for the useful discussion and assistance with Titan-ETEM and Titan-Themis.

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Correspondence to Ang Li or Xiaodong Han.

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Hui, F., Li, C., Chen, Y. et al. Understanding the structural evolution of Au/WO2.7 compounds in hydrogen atmosphere by atomic scale in situ environmental TEM. Nano Res. 13, 3019–3024 (2020). https://doi.org/10.1007/s12274-020-2966-7

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Keywords

  • in situ environmental TEM
  • H2 sensing
  • Au/WO2.7
  • gas-solid interface