Journal article
Monitoring surface transformations of metal carbodiimide water oxidation catalysts by operando XAS and Raman spectroscopy.
- Müller RJ University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- Lan J University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- Lienau K University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- Moré R University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- Triana CA University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- Iannuzzi M University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- Patzke GR University of Zurich, Department of Chemistry, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland. greta.patzke@chem.uzh.ch.
- 2018-07-07
Published in:
- Dalton transactions (Cambridge, England : 2003). - 2018
English
Transition metal carbodiimides MNCN (M = Co, Ni, Co0.9Ni0.1, Mn and Cu), were studied by simultaneous operando Raman and X-ray absorption spectroscopy (XAS) with focus on surface oxide detection during electrocatalytic water oxidation. As a proof of concept, easily modifiable screen-printed electrodes were used in this unified operando synchrotron setup for a trade-off between convenience of electrochemical anodization and spectroscopic data acquisition. Monitoring of chemical and structural transformations at the electrode surface during initial anodic electrode polarization shows stability for MNCN with M = Co, Ni, Co0.9Ni0.1 and Mn. While MnNCN is inactive, CoNCN emerges as the most active representative of the series. CuNCN displays pronounced side reactions and the formation of a surface copper oxide layer leading to lower current density attributed to water oxidation, as evident from an irreversible variation of the CuNCN redox behaviour in rotating ring-disc voltammetry. Furthermore, the accompanying structural and vibrational spectroscopy properties of the different MNCN compounds were explored with complementary ex situ analytical methods.
- Language
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- English
- Open access status
- closed
- Identifiers
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- DOI 10.1039/c8dt01587b
- PMID 29978162
- Persistent URL
- https://sonar.ch/global/documents/47572
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