Imperial College London
Portrait Picture

ProfessorBaptisteGault

Faculty of Engineering, Department of Materials

Professor of Atomic-Scale Characterization
 
 
 
//

Contact

 

b.gault

 
 
//

Location

 

Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Kasian:2020:10.1149/ma2020-01371557mtgabs,
author = {Kasian, O and Schweinar, K and Li, T and Mayrhofer, KJJ and Gault, B},
doi = {10.1149/ma2020-01371557mtgabs},
journal = {ECS Meeting Abstracts},
pages = {1557--1557},
title = {Tuning Fundamental Properties of Ir-Based Materials to Enhance Their Electrocatalytic Performance in the Oxygen Evolution Reaction},
url = {http://dx.doi.org/10.1149/ma2020-01371557mtgabs},
volume = {MA2020-01},
year = {2020}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - <jats:p>  The oxygen evolution reaction (OER) underpins electrochemical technologies for hydrogen generation [1]. The sluggish kinetics of the OER and the instability of most of the anode materials hinder widespread application of proton exchange membrane water electrolyzers (PEMWE). Up to now, only iridium-based catalysts meet the necessary requirements and are currently employed in PEMWE [2]. Despite the scarcity and high cost of iridium, its relatively high reactivity and superior stability make it irreplaceable to optimize the durability of the electrolyzer. Understanding what governs the electrocatalytic activity as well as the long-term stability of iridium is crucial for the development of novel catalysts that will enable efficient energy conversion and storage technologies. Gaining this knowledge requires establishing the correlation between the atomic-scale structure of the catalysts, their electronic properties and the mechanisms of the OER and other side reactions that lead to the material’s degradation.</jats:p>               <jats:p>In this presentation, I give an overview of our recent results, with a special focus on the mechanisms of the reactions ongoing at the surface of an array of iridium-based anodes during the OER [2-4]. The mechanistic insights are obtained from combination of X-ray photoelectron spectroscopy, online electrochemical mass spectrometry, electron microscopy and atom probe tomography. During the presentation, specific structural and compositional features that we recently revealed are responsible for high reactivity and/or instability of catalytic systems will be discussed in detail [4]. In addition several approaches to improve both the reactivity and the stability will be proposed, and can serve as guiding principles for the development of materials with superior electrocatalytic performance towards the OER.</jats:p>               <jats:p>[1] V. R. Stamenkovic, D. Strmcnik, P. P. Lopes and N.
AU  - Kasian,O
AU  - Schweinar,K
AU  - Li,T
AU  - Mayrhofer,KJJ
AU  - Gault,B
DO  - 10.1149/ma2020-01371557mtgabs
EP  - 1557
PY  - 2020///
SP  - 1557
TI  - Tuning Fundamental Properties of Ir-Based Materials to Enhance Their Electrocatalytic Performance in the Oxygen Evolution Reaction
T2  - ECS Meeting Abstracts
UR  - http://dx.doi.org/10.1149/ma2020-01371557mtgabs
VL  - MA2020-01
ER  -
Download