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 SM ISO690:2012VERNICKAITE, E., BERSIROVA, Oksana, CESIULIS, Henrikas, TSYNTSARU, Natalia. Design of highly active electrodes for hydrogen evolution reaction based on mo-rich alloys electrodeposited from ammonium acetate bath. In: Coatings, 2019, vol. 9, p. 0. ISSN 2079-6412. DOI: https://doi.org/10.3390/COATINGS9020085 |
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| Volumul 9 / 2019 / ISSN 2079-6412 | ||||||
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| DOI:https://doi.org/10.3390/COATINGS9020085 | ||||||
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The given research was driven by prospects to design Mo-rich coatings with iron group metals electrodeposited from a highly saturated ammonium acetate bath. The obtained coatings could be employed as prominent electrodes for the hydrogen evolution reaction (HER). It was found that the Mo content in Ni-Mo alloys can be tuned from 30 to 78 at.% by decreasing the molar ratio [Ni(II)]:[Mo(VI)] in the electrolyte from 1.0 to 0.25 and increasing the cathodic current density from 30 to 100 mA/cm2. However, dense cracks and pits are formed due to hydrogen evolution at high current densities and that diminishes the catalytic activity of the coating for HER. Accordingly, smoother and crack-free Ni-54 at.% Mo, Co-52 at.% Mo and Fe-54 at.% Mo alloys have been prepared at 30 mA/cm2. Their catalytic behavior for HER has been investigated in a 30 wt.% NaOH solution at temperatures ranging from 25 to 65 °C. A significant improvement of electrocatalytic activity with increasing bath temperature was noticed. The results showed that the sequence of electrocatalytic activity in alkaline media decreases in the following order: Co-52 at.% Mo > Ni-54 at.% Mo > Fe-54 at.% Mo. These peculiarities might be linked with different catalytic behavior of formed intermetallics (and active sites) in electrodeposited alloys. The designed electrodeposited Mo-rich alloys have a higher catalytic activity than Mo and Pt cast metals. |
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| Cuvinte-cheie Co-Mo, Electrocatalysis, Electrodeposition, Fe-Mo alloys, Hydrogen evolution reaction, Ni-Mo |
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<?xml version='1.0' encoding='utf-8'?> <oai_dc:dc xmlns:dc='http://purl.org/dc/elements/1.1/' xmlns:oai_dc='http://www.openarchives.org/OAI/2.0/oai_dc/' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd'> <dc:creator>Vernickaite, E.</dc:creator> <dc:creator>Bersirova, O.L.</dc:creator> <dc:creator>Cesiulis, H.</dc:creator> <dc:creator>Ţînţaru, N.I.</dc:creator> <dc:date>2019-02-11</dc:date> <dc:description xml:lang='en'><p>The given research was driven by prospects to design Mo-rich coatings with iron group metals electrodeposited from a highly saturated ammonium acetate bath. The obtained coatings could be employed as prominent electrodes for the hydrogen evolution reaction (HER). It was found that the Mo content in Ni-Mo alloys can be tuned from 30 to 78 at.% by decreasing the molar ratio [Ni(II)]:[Mo(VI)] in the electrolyte from 1.0 to 0.25 and increasing the cathodic current density from 30 to 100 mA/cm<sup>2</sup>. However, dense cracks and pits are formed due to hydrogen evolution at high current densities and that diminishes the catalytic activity of the coating for HER. Accordingly, smoother and crack-free Ni-54 at.% Mo, Co-52 at.% Mo and Fe-54 at.% Mo alloys have been prepared at 30 mA/cm<sup>2</sup>. Their catalytic behavior for HER has been investigated in a 30 wt.% NaOH solution at temperatures ranging from 25 to 65 °C. A significant improvement of electrocatalytic activity with increasing bath temperature was noticed. The results showed that the sequence of electrocatalytic activity in alkaline media decreases in the following order: Co-52 at.% Mo > Ni-54 at.% Mo > Fe-54 at.% Mo. These peculiarities might be linked with different catalytic behavior of formed intermetallics (and active sites) in electrodeposited alloys. The designed electrodeposited Mo-rich alloys have a higher catalytic activity than Mo and Pt cast metals.</p></dc:description> <dc:identifier>10.3390/COATINGS9020085</dc:identifier> <dc:source>Coatings () 0-0</dc:source> <dc:subject>Co-Mo</dc:subject> <dc:subject>Electrocatalysis</dc:subject> <dc:subject>Electrodeposition</dc:subject> <dc:subject>Fe-Mo alloys</dc:subject> <dc:subject>Hydrogen evolution reaction</dc:subject> <dc:subject>Ni-Mo</dc:subject> <dc:title>Design of highly active electrodes for hydrogen evolution reaction based on mo-rich alloys electrodeposited from ammonium acetate bath</dc:title> <dc:type>info:eu-repo/semantics/article</dc:type> </oai_dc:dc>
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