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Catalytic impact of alloyed Al on the corrosion behavior of Co50Ni23Ga26Al1.0 magnetic shape memory alloy and catalysis applications for efficient electrochemical H2 generation
Abstract
The electrochemical and corrosion behaviour of Co50Ni23Ga27-xAlx (x = 0 and 1.0 wt%) magnetic shape memory alloys (MSMAs) was studied in 0.5 M NaCl solutions using various electrochemical techniques. Results showed remarkable activation of the tested MSMA toward pitting corrosion upon alloying it with Al. XPS examination confirmed the activation influence of alloyed Al. It proved that the presence of Al in the alloy's matrix weakens its passivity, as manifested by lower amount of gallium oxides and Cl- adsorption in aluminium containing MSMA sample. Alloyed Al also activated significantly the tested MSMA for the hydrogen evolution reaction (HER), as indicated by cathodic polarization, electrochemical impedance spectroscopy (EIS), and Faradaic efficiency (FE) measurements. Such measurements were performed in 0.1 M KOH solutions and showed that Co50Ni23Ga26Al1.0 alloy is much more active for the HER than Co, Ni, Co50Ni50, and Co50Ni23Ga27 electrodes. The catalytic impact of pitting corrosion, proved to be catalyzed by Al, on the HER activity of CoNiGaAl alloy was also studied. The pitted Co50Ni23Ga26Al1.0 MSMA, the best catalyst here, exhibited high HER catalytic performance with an exchange current density (jo) of 0.2 mA cm-2 and FE 96%, thus approached Pt/C (jo = 0.6 mA cm-2 and FE ~ 100%). Our best catalyst also showed good stability and durability after 3000 cycles of cathodic polarization between the corrosion potential (Ecorr) and -1.0 V vs. RHE, and 24h of electrolysis at a high cathodic current density of 100 mA cm-2. Microstructure changes made by Al, together with findings obtained from SEM/EDX mapping and XPS studies, were used to interpret its activation influence towards the HER
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Authors (7)
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Amin Mohammed Prof.
- Ain Shams University Department of Chemistry
-
Nader El-bagoury
- Central Metallurgical Research and Development Institute Casting Technology Department
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Mohamed Mahmoud
- Central Metallurgical Research and Development Institute Casting Technology Department
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Mahmoud Hessien
- Taif University Department of Chemistry
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Sayed El-rehim Prof.
- Ain Shams University Department of Chemistry
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Full text
- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.1039/C6RA25384A
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
RSC Advances
edition 7,
pages 3635 - 2649,
ISSN: 2046-2069 - Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Mohammed A., El-Bagoury N., Mahmoud M., Hessien M., El-Rehim S., Wysocka J., Ryl J.: Catalytic impact of alloyed Al on the corrosion behavior of Co50Ni23Ga26Al1.0 magnetic shape memory alloy and catalysis applications for efficient electrochemical H2 generation// RSC Advances. -, iss. 7 (2017), s.3635-2649
- DOI:
- Digital Object Identifier (open in new tab) 10.1039/c6ra25384a
- Verified by:
- Gdańsk University of Technology
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