The University of Southampton
University of Southampton Institutional Repository

Scanning electrochemical microscopy (SECM): Study of the adsorption and desorption of hydrogen on platinum electrodes in Na2SO4 solution (pH=7)

Record type: Article

Hydrogen adsorption and desorption at polycrystalline platinum electrodes in a neutral Na2SO4 solution were studied with a scanning electrochemical microscope. Experiments were carried out with the tip-substrate voltammetry mode, where the faradaic current flowing to the tip is recorded while cycling the potential of the substrate, and with the tip-substrate chronoamperometry mode, where the tip faradaic current is recorded as a function of time following the application of a potential step to the substrate. The tip current was made pH sensitive by holding the tip potential in a region where a pH- dependent reaction occurs. Proton reduction was used to monitor pH decrease, whereas platinum oxide formation was selected to detect pH increase. The results showed that a transient pH decrease as high as 2.3 pH units exists during hydrogen desorption and that a great pH increase occurs during hydrogen adsorption. The mechanisms of hydrogen adsorption and desorption were analysed by comparing tip current vs. substrate potential curves, which reflect the exchange of H+ between the adsorbed layer and the solution, with substrate current vs. substrate potential curves, which reflect the exchange of electrons between the adsorbed layer and the electrode. New conclusions have been drawn.

Full text not available from this repository.

Citation

Yang, Yi-Fu and Denuault, Guy (1996) Scanning electrochemical microscopy (SECM): Study of the adsorption and desorption of hydrogen on platinum electrodes in Na2SO4 solution (pH=7) Journal of Electroanalytical Chemistry, 418, (1-2), pp. 99-107.

More information

Published date: 21 November 1996
Additional Information: WA976
Keywords: secm, scanning electrochemical microscope, hydrogen adsorption-desorption, platinum electrode single-crystal electrodes, acidic aqueous-media, polycrystalline platinum, stepped surfaces, mechanism, pt(100), behavior, polyaniline, absorption, evolution

Identifiers

Local EPrints ID: 179261
URI: http://eprints.soton.ac.uk/id/eprint/179261
ISSN: 1572-6657
PURE UUID: 4e798db6-e75f-42f2-8632-0ad5fa96adb7
ORCID for Guy Denuault: ORCID iD orcid.org/0000-0002-8630-9492

Catalogue record

Date deposited: 01 Apr 2011 09:27
Last modified: 18 Jul 2017 12:03

Export record

Contributors

Author: Yi-Fu Yang
Author: Guy Denuault ORCID iD

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×