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{Roy:2018:10.1038/s41929-018-0162-x,
author = {Roy, C and Sebok, B and Scott, SB and Fiordaliso, EM and Sørensen, JE and Bodin, A and Trimarco, DB and Damsgaard, CD and Vesborg, PCK and Hansen, O and Stephens, IEL and Kibsgaard, J and Chorkendorff, I},
doi = {10.1038/s41929-018-0162-x},
journal = {Nature Catalysis},
pages = {820--829},
title = {Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeO<inf>x</inf>H<inf>y</inf>},
url = {http://dx.doi.org/10.1038/s41929-018-0162-x},
volume = {1},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - NiFeOxHy are the most active catalysts for oxygen evolution in a base. For this reason, they are used widely in alkaline electrolysers. Several open questions remain as to the reason for their exceptionally high catalytic activity. Here we use a model system of mass-selected NiFe nanoparticles and isotope labelling experiments to show that oxygen evolution in 1 M KOH does not proceed via lattice exchange. We complement our activity measurements with electrochemistry–mass spectrometry, taken under operando conditions, and transmission electron microscopy and low-energy ion-scattering spectroscopy, taken ex situ. Together with the trends in particle size, the isotope results indicate that oxygen evolution is limited to the near-surface region. Using the surface area of the particles, we determined that the turnover frequency was 6.2 ± 1.6 s−1 at an overpotential of 0.3 V, which is, to the best of our knowledge, the highest reported for oxygen evolution in alkaline solution.
AU  - Roy,C
AU  - Sebok,B
AU  - Scott,SB
AU  - Fiordaliso,EM
AU  - Sørensen,JE
AU  - Bodin,A
AU  - Trimarco,DB
AU  - Damsgaard,CD
AU  - Vesborg,PCK
AU  - Hansen,O
AU  - Stephens,IEL
AU  - Kibsgaard,J
AU  - Chorkendorff,I
DO  - 10.1038/s41929-018-0162-x
EP  - 829
PY  - 2018///
SN  - 2520-1158
SP  - 820
TI  - Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeO<inf>x</inf>H<inf>y</inf>
T2  - Nature Catalysis
UR  - http://dx.doi.org/10.1038/s41929-018-0162-x
UR  - http://hdl.handle.net/10044/1/65473
VL  - 1
ER  -
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