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Journal article
Modifying Interface Solvation and Oxygen Reduction Electrocatalysis with Hydrophobic Species
Journal of physical chemistry. C, v 126(34), pp 14509-14517
01 Sep 2022
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Ionic liquid interlayers improve the oxygen reduction reaction (ORR) kinetics on bulk and nanostructured catalysts for both Pt and alloyed-Pt materials. Despite the demonstrated performance enhancement at the half-cell and membrane electrode assembly level, the mechanism of the improvement is not fully understood. In this work, we combine single-crystal experiments with microkinetic modeling to uncover the origin of the ORR kinetic improvement on Pt(111) in the presence of ionic liquids and hydrophobic cations. With the incorporation of a modified Frumkin isotherm, our model accurately simulates the disorder–order transition observed in hydroxyl and bisulfate adsorption on Pt(111) under acidic conditions. Voltametric analysis shows that ionic liquids impact solvation to break so-called scaling relations between the adsorption strength of OHad and Oad, but these effects have little impact on ORR activity. Instead, destabilized OHad reduces the overall hydroxyl (spectator) coverage, resulting in higher availability of active sites.
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Details
- Title
- Modifying Interface Solvation and Oxygen Reduction Electrocatalysis with Hydrophobic Species
- Creators
- Ramchandra Gawas - Drexel UniversityJoshua Snyder - Drexel UniversityMaureen Tang - Drexel University
- Publication Details
- Journal of physical chemistry. C, v 126(34), pp 14509-14517
- Publisher
- American Chemical Society; Washington, DC
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000849650200001
- Scopus ID
- 2-s2.0-85137408826
- Other Identifier
- 991019174893104721
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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