Imperial College London
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ProfessorBaptisteGault

Faculty of Engineering, Department of Materials

Professor of Atomic-Scale Characterization
 
 
 
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Contact

 

b.gault

 
 
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Location

 

Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Schweinar:2020:10.1149/ma2020-01371520mtgabs,
author = {Schweinar, K and Gault, B and Greiner, M and Raabe, D and Kasian, O},
doi = {10.1149/ma2020-01371520mtgabs},
journal = {ECS Meeting Abstracts},
pages = {1520--1520},
title = {Atomic-Scale View into the Degradation of Ir-Ru Alloys during Anodic Oxygen Evolution},
url = {http://dx.doi.org/10.1149/ma2020-01371520mtgabs},
volume = {MA2020-01},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - <jats:p>  Hydrogen is likely to play a key role as central energy carrier in the world’s transition towards a more sustainable future. Electricity from renewable sources can be used to power water electrolyzers to generate carbon-neutral hydrogen [1]. ‘Green’ hydrogen can then, for example, be used for the synthesis of carbon-neutral fuels, in the transportation sector to power H<jats:sub>2</jats:sub> fuel-cell fitted vehicles, as a carbon-neutral agent for the direct reduction of metals from ores, or to re-generate electricity in time of high demand. However, the technological upscaling of proton exchange membrane water electrolysis (PEM) devices is currently hindered by the low reactivity and instability of most catalyzing materials for the anodic oxygen evolution reaction (OER). The development of electrocatalysts with superior performance requires a detailed understanding of how their surfaces evolve during OER, ideally at the atomic scale [2,3]. The identification of the role of individual atoms in different chemical and structural environments in the near-surface region of the catalyst is crucial to understand the electrochemical performance and degradation processes.</jats:p>               <jats:p>Here, we provide atomic scale insights into the degradation mechanism of an Ir-Ru model alloy during electrochemical oxygen evolution. Ir-Ru alloys are promising candidates for PEM electrolysis combining the stability of Ir and high activity of Ru towards OER. The changes in electronic state of the catalysts induced by OER are studied by X-ray photoelectron spectroscopy (XPS), while an in-situ activity-stability analysis was performed online using an inductively coupled plasma mass spectrometer. Atom probe tomography (APT) was used to reveal the structure and composition of the first few atomic layers of the catalyst in three dimensions.</jats:p>               <jats:p>APT reveals strong compositional diffe
AU  - Schweinar,K
AU  - Gault,B
AU  - Greiner,M
AU  - Raabe,D
AU  - Kasian,O
DO  - 10.1149/ma2020-01371520mtgabs
EP  - 1520
PY  - 2020///
SP  - 1520
TI  - Atomic-Scale View into the Degradation of Ir-Ru Alloys during Anodic Oxygen Evolution
T2  - ECS Meeting Abstracts
UR  - http://dx.doi.org/10.1149/ma2020-01371520mtgabs
VL  - MA2020-01
ER  -
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