Electro-Oxidation of Ni42 Steel: A Highly Active Bifunctional Electrocatalyst
| Autor: | Klaus Müller-Buschbaum, Helmut Schäfer, Karsten Küpper, Peng Zhang, Jörg D. Hardege, Joachim Wollschläger, Simon Dühnen, Lorenz Walder, Ulrich Krupp, Shamaila Sadaf, Mercedes Schmidt, Johannes Stangl, Martin Steinhart, Daniel M. Chevrier |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Hydrogen Inorganic chemistry Oxide FOS: Physical sciences chemistry.chemical_element 02 engineering and technology Overpotential 010402 general chemistry Electrocatalyst 01 natural sciences 7. Clean energy Catalysis Biomaterials chemistry.chemical_compound Physics - Chemical Physics Electrochemistry Bifunctional Chemical Physics (physics.chem-ph) Oxygen evolution Buffer solution 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry 13. Climate action 0210 nano-technology |
| Zdroj: | Adv. Funct. Mater Advanced Functional Materials |
| ISSN: | 1616-301X |
| DOI: | 10.1002/adfm.201601581 |
| Popis: | Janus type Water-Splitting Catalysts have attracted highest attention as a tool of choice for solar to fuel conversion. AISI Ni 42 steel was upon harsh anodization converted in 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) respectively at pH 0, 1, 13, 14, 14.6 (HER). The current density taken from long-term OER measurements in pH 7 buffer solution upon the electro activated steel at 491 mV overpotential was around 4 times higher (4 mA/cm2) 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 were even superior to those known for IrO2-RuO2. No degradation of the catalyst was detected even when conditions close to standard industrial operations were applied to the catalyst. A stable Ni-, Fe- oxide based passivating layer sufficiently protected the bare metal for further oxidation. Quantitative charge to oxygen- (OER) and charge to hydrogen (HER) conversion was confirmed. High resolution XPS spectra showed that most likely gamma-NiO(OH) and FeO(OH) are the catalytic active OER and NiO is the catalytic active HER species. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text