Electro‐oxidation and reduction of H2 on platinum studied by scanning electrochemical microscopy for the purpose of local detection of H2 evolution. (December 2015)

• Record Type: Journal Article
• Authors: Jamali, Sina S.; Moulton, Simon E.; Tallman, Dennis E.; Weber, Jan; Wallace, Gordon G.
• Is Part Of: Surface and interface analysis. Volume 47:Number 13(2015)
• Page Start: 1187
• Page End: 1191
• Publication Date: 2015-12
• Subjects: scanning electrochemical microscopy -- H2 detection -- H2 electro‐oxidation -- H2 electro‐reduction -- H2/H+ redox recycling; Surfaces (Physics) -- Periodicals; Surface chemistry -- Periodicals; Thin films -- Periodicals; 541.33
• DOI: 10.1002/sia.5874
• Languages: English
• ISSNs: 0142-2421

Abstract

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.