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No Access Submitted: 23 February 2015 Accepted: 14 June 2015 Published Online: 16 July 2015

  • Fast and sensitive method for detecting volatile species in liquids

Review of Scientific Instruments 86, 075006 (2015); https://doi.org/10.1063/1.4923453
Daniel B. Trimarco1, Thomas Pedersen2, Ole Hansen2, Ib Chorkendorff1, and Peter C. K. Vesborg1, a)
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  • Daniel B. Trimarco
  • Thomas Pedersen
  • Ole Hansen
  • Ib Chorkendorff
  • Peter C. K. Vesborg
ABSTRACT
This paper presents a novel apparatus for extracting volatile species from liquids using a “sniffer-chip.” By ultrafast transfer of the volatile species through a perforated and hydrophobic membrane into an inert carrier gas stream, the sniffer-chip is able to transport the species directly to a mass spectrometer through a narrow capillary without the use of differential pumping. This method inherits features from differential electrochemical mass spectrometry (DEMS) and membrane inlet mass spectrometry (MIMS), but brings the best of both worlds, i.e., the fast time-response of a DEMS system and the high sensitivity of a MIMS system. In this paper, the concept of the sniffer-chip is thoroughly explained and it is shown how it can be used to quantify hydrogen and oxygen evolution on a polycrystalline platinum thin film in situ at absolute faradaic currents down to ∼30 nA. To benchmark the capabilities of this method, a CO-stripping experiment is performed on a polycrystalline platinum thin film, illustrating how the sniffer-chip system is capable of making a quantitative in situ measurement of <1 % of a monolayer of surface adsorbed CO being electrochemically stripped off an electrode at a potential scan-rate of 50 mV s−1.

Acknowledgments

Center for Individual Nanoparticle Functionality (CINF) is sponsored by The Danish National Research Foundation (No. DNRF 54).

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