Katsounaros, Ioannis, Meier, Josef C., Klemm, Sebastian O., Topalov, Angel A., Biedermann, P. Ulrich, Auinger, Michael and Mayrhofer, Karl J. J. (2011) The effective surface pH during reactions at the solid–liquid interface. Electrochemistry Communications, Volume 13 (Number 6). pp. 634-637. doi:10.1016/j.elecom.2011.03.032

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Abstract

In this work the activity of protons directly at the solid–liquid interface during a heterogeneous reaction is demonstrated without introducing any pH measurement device, in non-buffered and buffered solutions. Due to a simple approach we can experimentally demonstrate the relation between reaction rate and surface pH directly from the cyclic voltammograms. Clearly, the pH at a solid–liquid interface can be quite different from the bulk in unbuffered or insufficiently buffered solutions even at moderate reaction rates, in particular in the pH range of 4 to 10. However, at the given mass-transport conditions, well controlled by a rotating disk electrode, a buffer concentration of 10− 2 M is already sufficient to pin the surface pH to the bulk value at reaction rates of up to 1 mA cm− 2.

Item Type:	Journal Article
Divisions:	Faculty of Science > WMG (Formerly the Warwick Manufacturing Group)
Journal or Publication Title:	Electrochemistry Communications
Publisher:	Elsevier Inc.
ISSN:	1388-2481
Official Date:	June 2011
Dates:	Date Event June 2011 Published 2 April 2011 Available 25 March 2011 Accepted 21 February 2011 Submitted
Volume:	Volume 13
Number:	Number 6
Page Range:	pp. 634-637
DOI:	10.1016/j.elecom.2011.03.032
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access

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