期刊
ELECTROCHEMISTRY COMMUNICATIONS
卷 13, 期 6, 页码 634-637出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2011.03.032
关键词
Surface chemistry; Heterogeneous catalysis; Surface pH; Proton transport
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 front 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). (C) 2011 Elsevier B.V. All rights reserved.
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