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Corrosion Resistanc...
Corrosion Resistance and Catalytic Activity toward the Oxygen Reduction Reaction of CoCrFexNi (0 ≤ x ≤ 0.7) Thin Films
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- Linder, Clara (author)
- Linköpings universitet,RISE,Metodik för produktframtagning,Linköping University, Sweden,Nanostrukturerade material,Tekniska fakulteten,RISE, Sweden
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- Gangaprasad Rao, Smita, 1992- (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Boyd, Robert, 1972- (author)
- Linköpings universitet,Nanostrukturerade material,Tekniska fakulteten,Plasma och ytbeläggningsfysik
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- Le Febvrier, Arnaud, 1986- (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Eklund, Per, Associate Professor, 1977- (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Munktell, S. (author)
- Swerim AB, Sweden
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- Björk, Emma, 1981- (author)
- Linköpings universitet,Nanostrukturerade material,Tekniska fakulteten
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(creator_code:org_t)
- 2022-08-25
- 2022
- English.
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In: ACS Applied Energy Materials. - : American Chemical Society. - 2574-0962. ; 5:9, s. 10838-10848
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Abstract
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- Corrosion resistance and catalytic activity toward the oxygen reduction reaction (ORR) in an alkaline environment are two key properties for water recombination applications. In this work, CoCrFexNi (0 ≤ x ≤ 0.7) thin films were deposited by magnetron sputtering on polished steel substrates. The native passive layer was 2-4 nm thick and coherent to the columnar grains determined by transmission electron microscopy. The effect of Fe on the corrosion properties in 0.1 M NaCl and 1 M KOH and the catalytic activity of the films toward ORR were investigated. Electrochemical impedance spectroscopy and potentiodynamic polarization measurements indicate that CoCrFe0.7Ni and CoCrFe0.3Ni have the highest corrosion resistance of the studied films in NaCl and KOH, respectively. The high corrosion resistance of the CoCrFe0.7Ni film in NaCl was attributed to the smaller overall grain size, which leads to a more homogeneous film with a stronger passive layer. For CoCrFe0.3Ni in KOH, it was attributed to a lower Fe dissolution into the electrolyte and the build-up of a thick and protective hydroxide layer. Scanning Kelvin probe force microscopy showed no potential differences globally in any of the films, but locally, a potential gradient between the top of the columns and grain boundaries was observed. Corrosion of the films was likely initiated at the top of the columns where the potential was lowest. It was concluded that Fe is essential for the electrochemical activation of the surfaces and the catalytic activity toward ORR in an alkaline medium. The highest catalytic activity was recorded for high Fe-content films (x ≥ 0.5) and was attributed to the formation of platelet-like oxide particles on the film surface upon anodization. The study showed that the combination of corrosion resistance and catalytic activity toward ORR is possible for CoCrFexNi, making this material system a suitable candidate for water recombination in an alkaline environment.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik -- Korrosionsteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering -- Corrosion Engineering (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Keyword
- corrosion
- electrocatalysis
- magnetron sputtering
- multicomponent thin film
- ORR
- water recombination
- Catalyst activity
- Corrosion resistance
- Corrosive effects
- Electrochemical corrosion
- Electrochemical impedance spectroscopy
- Electrolytes
- Electrolytic reduction
- Grain boundaries
- High resolution transmission electron microscopy
- Iron
- Iron alloys
- Oxygen
- Potassium hydroxide
- Sodium chloride
- Ternary alloys
- Thin films
- Alkaline environment
- Columnar grain
- Magnetron-sputtering
- Multicomponent thin films
- Oxygen reduction reaction
- Passive layer
- Property
- Steel substrate
- Thin-films
Publication and Content Type
- ref (subject category)
- art (subject category)
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Linder, Clara
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Gangaprasad Rao, ...
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Boyd, Robert, 19 ...
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Le Febvrier, Arn ...
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Eklund, Per, Ass ...
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Munktell, S.
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Björk, Emma, 198 ...
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ENGINEERING AND ...
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and Chemical Enginee ...
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and Corrosion Engine ...
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NATURAL SCIENCES
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ACS Applied Ener ...
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RISE
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Linköping University