Imperial College London
Alternate

ProfessorAnthonyKucernak

Faculty of Natural Sciences, Department of Chemistry

Professor of Physical Chemistry
 
 
 
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Contact

 

+44 (0)20 7594 5831anthony Website

 
 
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Location

 

G22BMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Citation

BibTex format

@article{Mehmood:2022:10.1038/s41929-022-00772-9,
author = {Mehmood, A and Gong, M and jaouen, F and roy, A and zitolo, A and khan, A and sougrati, M-T and primbs, M and martinez, bonastre A and fongalland, D and drazic, G and strasser, P and Kucernak, A},
doi = {10.1038/s41929-022-00772-9},
journal = {Nature Materials},
pages = {311--323},
title = {High loading of single atomic iron sites in Fe-NC oxygen reduction catalysts for proton exchange membrane fuel cells},
url = {http://dx.doi.org/10.1038/s41929-022-00772-9},
volume = {5},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Non-precious iron-based catalysts (Fe-NCs) require high active site density (SD) to meet the performance targets as cathode catalysts in proton exchange membrane fuel cells (PEMFCs). SD is generally limited to that achieved at 1-3 wt%(Fe) loading due to the  undesired formation of iron-containing nanoparticles at higher loadings. Here we show that by pre-forming a carbon-nitrogen matrix using a sacrificial metal (Zn) in the initial synthesis step and then exchanging iron into this preformed matrix we achieve 7 wt% iron coordinated solely as single atom Fe-N4 sites as identified by 57Fe cryo Mössbauer spectroscopy and X-ray absorption spectroscopy. SD values measured by in situ nitrite stripping and ex situ CO chemisorption methods are 4.7x1019 and 7.8x1019 sitesg-1, with a turnover frequency of 5.4 electronssites-1s-1 at 0.80 V in 0.5M H2SO4 electrolyte. The catalyst delivers excellent PEMFC performance with current densities of 41.3 mAcm-2 at 0.90 ViR-free using H2-O2 (10.6 Ag-1) and 145 mA cm-2 at 0.80 V (199 mAcm-2 at 0.80 ViR-free) using H2-air.
AU  - Mehmood,A
AU  - Gong,M
AU  - jaouen,F
AU  - roy,A
AU  - zitolo,A
AU  - khan,A
AU  - sougrati,M-T
AU  - primbs,M
AU  - martinez,bonastre A
AU  - fongalland,D
AU  - drazic,G
AU  - strasser,P
AU  - Kucernak,A
DO  - 10.1038/s41929-022-00772-9
EP  - 323
PY  - 2022///
SN  - 1476-1122
SP  - 311
TI  - High loading of single atomic iron sites in Fe-NC oxygen reduction catalysts for proton exchange membrane fuel cells
T2  - Nature Materials
UR  - http://dx.doi.org/10.1038/s41929-022-00772-9
UR  - https://www.nature.com/articles/s41929-022-00772-9
UR  - http://hdl.handle.net/10044/1/95481
VL  - 5
ER  -
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