NDLI: Catalytic impact of alloyed Al on the corrosion behavior of Co50Ni23Ga26Al1.0 magnetic shape memory alloy and catalysis applications for efficient electrochemical H2 generation

Content Provider	Royal Society of Chemistry (RSC)
Author	Wysocka, Joanna Amin, Mohammed. A. Ryl, Jacek El-Bagoury, Nader Mahmoud, M. H. H. Hessien, M. M. El-Rehim, Sayed S. Abd
Copyright Year	2017
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 a lower amount of gallium oxides and Cl− adsorption in the 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 the 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 the 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%, and 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 24 h 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.
Starting Page	3635
Ending Page	3649
Page Count	15
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	7
Issue Number	7
Journal	RSC Advances
DOI	10.1039/c6ra25384a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Gallium Hydrogen Aluminium RHE Composite material Faraday efficiency Exchange current density Pitting corrosion Corrosion Magnetic shape-memory alloy Adsorption Electrolysis Electrochemistry Partial current Electrical impedance
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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