Journal article
Adsorbed Hydroxide Does Not Participate in the Volmer Step of Alkaline Hydrogen Electrocatalysis
ACS catalysis, v 7(12), pp 8314-8319
01 Dec 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The sluggish kinetics of the alkaline hydrogen electrode have been attributed to the need to adsorb both H and OH optimally. In this work, single-crystal voltammetry and microkinetic modeling show that an OH-mediated mechanism is not viable on Pt(110). Only a direct Volmer step can explain observed kinetic trends with OH adsorption strength in KOH and LiOH electrolytes. Instead, OH behaves as a rapidly equilibrated spectator species that decreases available surface sites and slows hydrogen kinetics. These results identify kinetic barriers from interfacial water structure, not adsorption energies, as key to explaining changes in hydrogen kinetics with pH.
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Details
- Title
- Adsorbed Hydroxide Does Not Participate in the Volmer Step of Alkaline Hydrogen Electrocatalysis
- Creators
- Saad Intikhab - Drexel UniversityJoshua D. Snyder - Drexel UniversityMaureen H. Tang - Drexel University
- Publication Details
- ACS catalysis, v 7(12), pp 8314-8319
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 6
- Grant note
- 1602886 / National Science Foundation through Catalysis Program in the Division of Chemical, Biological, Environmental and Transport Systems
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000417230500032
- Scopus ID
- 2-s2.0-85036654369
- Other Identifier
- 991019169671104721
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- Web of Science research areas
- Chemistry, Physical