Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeOxHy

C. Roy; Béla Sebok; B. Scott; E.M. Fiordaliso; J.E. Sørensen; A. Bodin; D.B. Trimarco; C.D. Damsgaard; P.C.K. Vesborg; O. Hansen; I.E.L. Stephens; J. Kibsgaard; Ib Chorkendorff

doi:10.1038/s41929-018-0162-x

Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeO_xH_y

C. Roy, Béla Sebok, B. Scott, E.M. Fiordaliso, J.E. Sørensen, A. Bodin, D.B. Trimarco, C.D. Damsgaard, P.C.K. Vesborg, O. Hansen, I.E.L. Stephens, J. Kibsgaard, Ib Chorkendorff^*

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › Research › peer-review

997 Downloads (Pure)

Abstract

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.

Original language	English
Journal	Nature Catalysis
Volume	1
Issue number	11
Pages (from-to)	820-829
Number of pages	10
DOIs	https://doi.org/10.1038/s41929-018-0162-x
Publication status	Published - 2018

Access to Document

10.1038/s41929-018-0162-x

Roy2018Accepted author manuscript, 3.23 MB

OpenUrl availability

Full text

Cite this

@article{92524fdbd24c49e2bf4e83d37796f2c1,

title = "Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeOxHy",

abstract = "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.",

author = "C. Roy and B{\'e}la Sebok and B. Scott and E.M. Fiordaliso and J.E. S{\o}rensen and A. Bodin and D.B. Trimarco and C.D. Damsgaard and P.C.K. Vesborg and O. Hansen and I.E.L. Stephens and J. Kibsgaard and Ib Chorkendorff",

year = "2018",

doi = "10.1038/s41929-018-0162-x",

language = "English",

volume = "1",

pages = "820--829",

journal = "Nature Catalysis",

issn = "2520-1158",

publisher = "Macmillan Publishers",

number = "11",

}

TY - JOUR

T1 - Impact of nanoparticle size and lattice oxygen on water oxidation on NiFeOxHy

AU - Roy, C.

AU - Sebok, Béla

AU - Scott, B.

AU - Fiordaliso, E.M.

AU - Sørensen, J.E.

AU - Bodin, A.

AU - Trimarco, D.B.

AU - Damsgaard, C.D.

AU - Vesborg, P.C.K.

AU - Hansen, O.

AU - Stephens, I.E.L.

AU - Kibsgaard, J.

AU - Chorkendorff, Ib

PY - 2018

Y1 - 2018

N2 - 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.

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.

U2 - 10.1038/s41929-018-0162-x

DO - 10.1038/s41929-018-0162-x

M3 - Journal article

SN - 2520-1158

VL - 1

SP - 820

EP - 829

JO - Nature Catalysis

JF - Nature Catalysis

IS - 11

ER -