Design principles for platinum nanoparticles catalysing electrochemical hydrogen evolution and oxidation reactions: edges are much more active than facets

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Title: Design principles for platinum nanoparticles catalysing electrochemical hydrogen evolution and oxidation reactions: edges are much more active than facets
Author(s): Zalitis, C
Kucernak, ARJ
Sharman, J
Wright, E
Item Type: Journal Article
Abstract: Improving the performance of hydrogen evolution and oxidation reactions using precious metal catalysts is key in reducing the cost of electrolysers and fuel cells. By considering the performance of these reactions as a function of platinum particle size (2.1–15 nm) under high mass transport conditions in acids, we find that the activity is composed of two components which vary in a defined way with the particle size. Geometrical considerations and electrokinetic modelling suggest that these two components correspond to the response of edges/vertices and the response of facets (Pt(100) and Pt(111)). Edges and vertices are much more active towards the hydrogen reaction. This assignment also rationalises the poor performance of platinum in alkaline environments. We predict that “ideal” particles made up of only edges/vertices would allow fuel cells and electrolysers to operate with only 1 μgPt cm−2 – about two to three orders of magnitude lower than what is currently used.
Publication Date: 1-Nov-2017
Date of Acceptance: 1-Sep-2017
URI: http://hdl.handle.net/10044/1/50585
DOI: https://dx.doi.org/10.1039/C7TA05543A
ISSN: 2050-7496
Publisher: Royal Society of Chemistry
Start Page: 23328
End Page: 23338
Journal / Book Title: Journal of Materials Chemistry A
Volume: 5
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/H500227/1
EP/J016454/1
EP/P024807/1
Copyright Statement: This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Chemistry
Materials Science
OXYGEN REDUCTION REACTION
SINGLE-CRYSTAL SURFACES
HIGH-MASS TRANSPORT
ROTATING-DISK ELECTRODE
FUEL-CELL REACTIONS
PARTICLE-SIZE
ALKALINE ELECTROLYTES
MICROBALANCE ANALYSIS
REACTION-KINETICS
SULFURIC-ACID
Publication Status: Published
Appears in Collections:Chemistry
Faculty of Natural Sciences



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