Helmut Schäfer
Electro-oxidation of Ni42 steel: A highly active bifunctional electrocatalyst
Schäfer, Helmut; Chevrier, Daniel M.; Zhang, Peng; Stangl, Johannes; Müller-Buschbaum, Klaus; Hardege, Jörg D.; Kuepper, Karsten; Wollschläger, Joachim; Krupp, Ulrich; Dühnen, Simon; Steinhart, Martin; Walder, Lorenz; Sadaf, Shamaila; Schmidt, Mercedes
Authors
Daniel M. Chevrier
Peng Zhang
Johannes Stangl
Klaus Müller-Buschbaum
Jörg D. Hardege
Karsten Kuepper
Joachim Wollschläger
Ulrich Krupp
Simon Dühnen
Martin Steinhart
Lorenz Walder
Shamaila Sadaf
Mercedes Schmidt
Abstract
Janus type water‐splitting catalysts have attracted highest attention as a tool of choice for solar to fuel conversion. AISI Ni42 steel is upon harsh anodization converted into a bifunctional electrocatalyst. Oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are highly efficiently and steadfast catalyzed at pH 7, 13, 14, 14.6 (OER) and at pH 0, 1, 13, 14, 14.6 (HER), respectively. The current density taken from long‐term OER measurements in pH 7 buffer solution upon the electro‐activated steel at 491 mV overpotential (η) is around four times higher (4 mA cm−2) in comparison with recently developed OER electrocatalysts. The very strong voltage–current behavior of the catalyst shown in OER polarization experiments at both pH 7 and at pH 13 are even superior to those known for IrO2‐RuO2. No degradation of the catalyst is detected even when conditions close to standard industrial operations are applied to the catalyst. A stable Ni‐, Fe‐oxide based passivating layer sufficiently protects the bare metal for further oxidation. Quantitative charge to oxygen (OER) and charge to hydrogen (HER) conversion are confirmed. High‐resolution XPS spectra show that most likely γ−NiO(OH) and FeO(OH) are the catalytic active OER and NiO is the catalytic active HER species.
Citation
Schäfer, H., Chevrier, D. M., Zhang, P., Stangl, J., Müller-Buschbaum, K., Hardege, J. D., Kuepper, K., Wollschläger, J., Krupp, U., Dühnen, S., Steinhart, M., Walder, L., Sadaf, S., & Schmidt, M. (2016). Electro-oxidation of Ni42 steel: A highly active bifunctional electrocatalyst. Advanced Functional Materials, 26(35), 6402-6417. https://doi.org/10.1002/adfm.201601581
Journal Article Type | Article |
---|---|
Acceptance Date | May 27, 2016 |
Online Publication Date | Jul 5, 2016 |
Publication Date | Sep 20, 2016 |
Deposit Date | Aug 6, 2018 |
Journal | Advanced Functional Materials |
Print ISSN | 1616-301X |
Publisher | Wiley |
Peer Reviewed | Peer Reviewed |
Volume | 26 |
Issue | 35 |
Pages | 6402-6417 |
DOI | https://doi.org/10.1002/adfm.201601581 |
Keywords | Electrocatalysis; Full‐water splitting; Hydrogen evolution reaction; Oxygen evolution reaction |
Public URL | https://hull-repository.worktribe.com/output/968167 |
Publisher URL | https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.201601581 |
Related Public URLs | https://arxiv.org/abs/1703.07775 |
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