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  Trends in reactivity of electrodeposited 3d transition metals on gold revealed by operando soft x-ray absorption spectroscopy during water splitting

Velasco Vélez, J., Jones, T., Pfeifer, V., Dong, C.-L., Chen, Y.-X., Chen, C.-M., et al. (2017). Trends in reactivity of electrodeposited 3d transition metals on gold revealed by operando soft x-ray absorption spectroscopy during water splitting. Journal of Physics D, 50(2): 024002. doi:10.1088/1361-6463/50/2/024002.

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Velasco Vélez, Juan1, 2, Author           
Jones, Travis1, Author           
Pfeifer, Verena1, Author           
Dong, Chung-Li3, 4, Author
Chen, Yu-Xun3, Author
Chen, Chieh-Ming3, Author
Chen, Hsin-Yu3, Author
Lu, Ying-Rui3, Author
Chen, Jin-Ming4, Author
Schlögl, Robert1, 2, Author           
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2Department of Heterogeneous Reactions, Max Planck Institute for Chemical Energy Conversion, Mülheim an der Ruhr 45470, Germany, ou_persistent22              
3Department of Physics, Tamkang University, New Taipei City 25137, Taiwan, ou_persistent22              
4National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan, ou_persistent22              

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 Abstract: We activated gold electrodes for their use as electrocatalyst for water splitting by electrodepositing Cu, Ni and Co. A combination of operando x-ray absorption spectroscopy and potentiometric control under aqueous conditions revealed the trends in reactivity yielded by these electrodes, which are directly associated with the cross- and overpotentials as well as the occupancy of the 3d orbitals. It was found that under anodic polarization the materials electrodeposited on gold suffer from a lack of stability, while under cathodic polarization they exhibit stable behavior. The observed activity is strongly related to the lack of stability shown by these composites under anodic polarization revealing a dynamic process ruled by corrosion. By operando x-ray absorption, we established that the overall enhancement of the activity for the oxygen evolution reaction is directly attributable to the cross-potential and corrosion process of the electrodeposited materials. It is associated with the high potential deposition, which is the origin of the incipient oxidation-corrosion resistance of the lattice. We conclude that the observed trends in the total current are directly associated with the loss of oxygen in the metal-oxide lattice and the subsequent dissolution of metallic ions in the electrolyte under anodic polarization.

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 Dates: 2016-10-102016-05-302016-11-142016-12-022017-01-18
 Publication Status: Issued
 Pages: 10
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 Rev. Type: Peer
 Identifiers: DOI: 10.1088/1361-6463/50/2/024002
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Title: Journal of Physics D
  Abbreviation : J. Phys. D: Appl. Phys.
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: 10 Volume / Issue: 50 (2) Sequence Number: 024002 Start / End Page: - Identifier: ISSN: 0022-3727
CoNE: https://pure.mpg.de/cone/journals/resource/0022-3727