Imperial College London
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Prof. Ifan E. L. Stephens

Faculty of Engineering, Department of Materials

Professor in Electrochemistry
 
 
 
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Contact

 

+44 (0)20 7594 9523i.stephens Website

 
 
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Location

 

Molecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Favero:2022:10.1149/ma2022-01351471mtgabs,
author = {Favero, S and Stephens, IEL and Titirici, M},
doi = {10.1149/ma2022-01351471mtgabs},
journal = {ECS Meeting Abstracts},
pages = {1471--1471},
title = {Deconvoluting Transport and Kinetics on Ionic Liquid-Modified Fe Catalysts for Oxygen Reduction},
url = {http://dx.doi.org/10.1149/ma2022-01351471mtgabs},
volume = {MA2022-01},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - <jats:p>                    <jats:bold>Introduction</jats:bold>               </jats:p>               <jats:p>Hydrogen fuel cells could play a key role in the decarbonization of the energy sector. However, their commercialization is hindered by the sluggish kinetics of the oxygen reduction reaction (ORR) and by the requirement of platinum, which is expensive and unsustainable. Alternative catalysts based on transition metals have proven promising, but their activity and durability is still far from that of platinum.</jats:p>               <jats:p>Recently, thin layers of ionic liquids have been successfully used to improve both the durability and activity of noble-metal free ORR catalysts<jats:uri xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#_ftn1" xlink:type="simple">[1]</jats:uri>. As shown in Figure 1, the presence of the ionic liquid layer can influence the reaction kinetics through multiple effects: (i) O<jats:sub>2</jats:sub> transport, (ii) water transport (iii) proton transport and (iv) binding to the reaction intermediate.</jats:p>               <jats:p>These competing effects are generally convoluted. To that end, we have recently developed models to quantify the effect of the ionic liquid on both oxygen transport and reaction kinetics.</jats:p>               <jats:p>                  <jats:bold>Effect of Ionic liquids on reaction kinetics</jats:bold>               </jats:p>               <jats:p>The ionic liquids tested for oxygen reduction are hydrophobic and their degree of water uptake is largely controlled by the cation. By decreasing the concentration of water at the active sites, they can cause the dehydration of the OH intermediate, ultimately weakening the OH bond<jats:uri xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="#_ftn2" xlink:type="simple">[2
AU  - Favero,S
AU  - Stephens,IEL
AU  - Titirici,M
DO  - 10.1149/ma2022-01351471mtgabs
EP  - 1471
PY  - 2022///
SP  - 1471
TI  - Deconvoluting Transport and Kinetics on Ionic Liquid-Modified Fe Catalysts for Oxygen Reduction
T2  - ECS Meeting Abstracts
UR  - http://dx.doi.org/10.1149/ma2022-01351471mtgabs
VL  - MA2022-01
ER  -
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