Journal article
Kinetic Isotope Effects Quantify pH-Sensitive Water Dynamics at the Pt Electrode Interface
The journal of physical chemistry letters, v 11(6), pp 2308-2313
19 Mar 2020
PMID: 32125855
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
The pH-dependent kinetics of the hydrogen oxidation and evolution reactions (HERs and HORs) remain a fundamental conundrum in modern electrochemistry. Recent efforts have focused on the impact of the interfacial water network on the reaction kinetics. In this work, we quantify the importance of interfacial water dynamics on the overall hydrogen reaction kinetics with kinetic isotope effect (KIE) voltammetry experiments on single-crystal Pt(111) and Pt(110). Our results find a surface-sensitive KIE for both the HER and the HOR that is measurable in base but not in acid. Remarkably, the HOR in KOD on Pt(111) yields a KIE of up to 3.4 at moderate overpotentials, greater than any expected secondary KIE values, yet the HOR in DClO4 yields no measurable KIE. These results provide direct evidence that solvent dynamics play a crucial role in the alkaline but not in the acidic hydrogen reactions, thus reinforcing the importance of "beyond adsorption" phenomena in modern electrocatalysis.
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Details
- Title
- Kinetic Isotope Effects Quantify pH-Sensitive Water Dynamics at the Pt Electrode Interface
- Creators
- Luis Rebollar - Drexel UniversitySaad Intikhab - Drexel UniversityJoshua D. Snyder - Drexel UniversityMaureen H. Tang - Drexel University
- Publication Details
- The journal of physical chemistry letters, v 11(6), pp 2308-2313
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 6
- Grant note
- NSF-1602886 / National Science Foundation; National Science Foundation (NSF)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000526339000047
- Scopus ID
- 2-s2.0-85081674160
- Other Identifier
- 991019169556504721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Atomic, Molecular & Chemical