Electro‐oxidation and reduction of H2 on platinum studied by scanning electrochemical microscopy for the purpose of local detection of H2 evolution |
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| Authors: | Sina S Jamali Simon E Moulton Dennis E Tallman Jan Weber Gordon G Wallace |
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| Institution: | 1. ARC Centre of Excellence for Electromaterials Sciences, University of Wollongong, Wollongong, NSW, Australia;2. ARC Research Hub for Australian Steel Manufacturing, Faculty of Engineering & Information Sciences, University of Wollongong, Wollongong, NSW, Australia;3. Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, Victoria, Australia;4. Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, USA;5. Boston Scientific, Maastricht, The Netherlands |
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| Abstract: | Electrochemical detection of H2 using scanning electrochemical microscopy (SECM) has shown to hold great promise as a sensitive characterization method with high spatial resolution for active surfaces generating H2. Herein, the factors contributing to the current that is measured by SECM in generation/collection mode for H2 detection are studied. In particular, the concentration gradient of H2 at the substrate, the H2/H+ recycling between the SECM tip and substrate and hemispherical profile of H2 diffusion has been discussed. It was postulated that H2/H+ recycling plays a dominant role in the oxidative current measured in generation/collection mode of SECM when the microelectrode is positioned in close vicinity of substrate. Copyright © 2015 John Wiley & Sons, Ltd. |
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| Keywords: | scanning electrochemical microscopy H2 detection H2 electro‐oxidation H2 electro‐reduction H2/H+ redox recycling |
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