Journalartikel

Autorenliste: Schäfer, H; Chevrier, DM; Zhang, P; Stangl, J; Müller-Buschbaum, K; Hardege, JD; Kuepper, K; Wollschläger, J; Krupp, U; Duhnen, S; Steinhart, M; Walder, L; Sadaf, S; Schmidt, M

Jahr der Veröffentlichung: 2016

Seiten: 6402-6417

Zeitschrift: Advanced Functional Materials

Bandnummer: 26

Heftnummer: 35

ISSN: 1616-301X

DOI Link: https://doi.org/10.1002/adfm.201601581

Verlag: Wiley

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 (eta) 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 center dot 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 gamma-NiO(OH) and FeO(OH) are the catalytic active OER and NiO is the catalytic active HER species.

Harvard-Zitierstil: Schäfer, H., Chevrier, D., Zhang, P., Stangl, J., Müller-Buschbaum, K., Hardege, J., et al. (2016) Electro-Oxidation of Ni42 Steel: A Highly Active Bifunctional Electrocatalyst, Advanced Functional Materials, 26(35), pp. 6402-6417. https://doi.org/10.1002/adfm.201601581

APA-Zitierstil: Schäfer, H., Chevrier, D., Zhang, P., Stangl, J., Müller-Buschbaum, K., Hardege, J., Kuepper, K., Wollschläger, J., Krupp, U., Duhnen, 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