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Updated: Jul 11, 2025
Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
Selective Detection of CO Using Proton-Conducting Graphene Oxide Membranes with Pt-Doped SnO2 Electrocatalysts:
Kosuke Sonda1, Taiga Kodama1, Maria Drira Wea Siga1
1Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan.
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To reduce the risk of carbon monoxide (CO) poisoning, there is a strong need for small, compact gas sensors to detect and monitor CO at ppm concentrations. In this study, we focused on detecting CO with electrochemical sensors based on proton-conducting graphene oxide (GO) nanosheets at room temperature. We found that a Ce-doped GO nanosheet membrane fitted with the sensing electrode composed of Pt (10 wt %)-doped SnO2 nanocrystals exhibits an excellent sensor response to CO at 25 °C. Pt doping of SnO2 nanocrystals has made it possible to detect CO more selectively than H2 and ethanol. The CO detection mechanism is analyzed by operando diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), Fourier transform infrared gas cell measurements, and comprehensive density functional theory-based calculations. The results revealed that adsorption of CO occurs predominantly on Pt sites, and the adsorbed CO is anodically oxidized at the interface between the sensing electrode and proton-conducting membrane, generating the selective sensor response. The strong adsorption of CO was realized with Pt (10 wt %)-doped SnO2 nanocrystals, as revealed by the DRIFTS analysis and temperature-programed desorption technique.
