Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction.

Drevon D, Gorlin M, Chernev P, Xi L, Dau H, Aziz-Lange K (2019)
Scientific reports 9: 1532.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
In-situ X-ray absorption spectroscopy (XAS) at the oxygen K-edge was used to investigate the role of oxygen during the oxygen evolution reaction (OER) in an electrodeposited Ni-Fe(OxHy) electrocatalyst in alkaline pH. We show the rise of a pre-peak feature at 529 eV in the O K-edge spectra, correlated to the appearance of a shoulder at the Ni L3-edge and formation of oxidized Ni3+/4+-O. Then, for the first time, we track the spectral changes in a dynamic fashion in both the soft and hard X-ray regimes during cyclic voltammetry (in situ CV-XAS) to obtain a fine-tuned resolution of the potential-related changes. The pre-peak feature at the O K-edge likely signifies formation of an electron deficient oxygen site. The electrophilic oxygen species appears and disappears reversibly in correlation with the Ni2+ ↔ Ni3+/4+ process, and persists during OER catalysis as long the metal is oxidized. Our study provides new insight into OER electrocatalysis: Before onset of the O-O bond formation step, the catalytic oxyhydroxide has accumulated electron deficiencies by both, oxidation of transition metal ions and formation of partially oxidized oxygen sites.
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Scientific reports
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9
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1532
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Drevon D, Gorlin M, Chernev P, Xi L, Dau H, Aziz-Lange K. Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction. Scientific reports. 2019;9: 1532.
Drevon, D., Gorlin, M., Chernev, P., Xi, L., Dau, H., & Aziz-Lange, K. (2019). Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction. Scientific reports, 9, 1532. doi:10.1038/s41598-018-37307-x
Drevon, D., Gorlin, M., Chernev, P., Xi, L., Dau, H., and Aziz-Lange, K. (2019). Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction. Scientific reports 9:1532.
Drevon, D., et al., 2019. Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction. Scientific reports, 9: 1532.
D. Drevon, et al., “Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction.”, Scientific reports, vol. 9, 2019, : 1532.
Drevon, D., Gorlin, M., Chernev, P., Xi, L., Dau, H., Aziz-Lange, K.: Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction. Scientific reports. 9, : 1532 (2019).
Drevon, Dorian, Gorlin, Mikaela, Chernev, Petko, Xi, Lifei, Dau, Holger, and Aziz-Lange, Kathrin. “Uncovering The Role of Oxygen in Ni-Fe(OxHy) Electrocatalysts using In situ Soft X-ray Absorption Spectroscopy during the Oxygen Evolution Reaction.”. Scientific reports 9 (2019): 1532.

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