Szczegóły publikacji

Opis bibliograficzny

Autorzy (5)

• Fukumoto Michihisa
• Takahashi Hiroki
• AGHKutyła Dawid
• AGHWojnicki Marek
• AGHŻabiński Piotr

Słowa kluczowe

Dane bibliometryczne

ID BaDAP	150978
Data dodania do BaDAP	2024-01-05
Tekst źródłowy	URL
DOI	10.1016/j.ijhydene.2023.09.077
Rok publikacji	2024
Typ publikacji	artykuł w czasopiśmie
Otwarty dostęp
Czasopismo/seria	International Journal of Hydrogen Energy

Abstract

A two-step electrolytic deposition of Ni and Pt from aqueous solutions formed a porous Ni–Pt alloy surface. A nickel sample with a thin layer of platinum covered by a nickel electrode coating was used in the electrolysis of aluminium from molten salts at 900°. The molten salt was a mixture of 48.25 mol% NaCl, 48.25 mol% KCl and 3.5 mol% AlF3. Deposition of Al on Ni and Pt samples was carried out at a potential of −1.8 V, respectively. Al and the resulting intermetallic phases were dissolved at −0.5 V to produce porous Ni–Pt alloy foams. It was found that a porous Ni–Pt alloy layer is formed due to an intense reaction between liquid Al and solid Ni, which propagates deep into the solid material. The high temperature of the molten salts allows the metallic Pt to penetrate deep into the porous structure. It makes it possible to obtain a uniform Pt distribution in the electrode volume. The fabricated porous Ni–Pt alloy was tested in cathodic and anodic polarisation measurements in an aqueous solution of 10 wt% KOH to assess their electrocatalytic activity. During constant-voltage electrolysis, a solid-electrolyte hydrogen sensor was coupled to the experimental system and allowed the in-situ hydrogen production efficiency to be measured. The promising electrochemical performance of porous Ni–Pt alloys as electrode materials for hydrogen and oxygen release in alkaline solutions was confirmed by measuring the partial pressure of hydrogen in electrolysis at constant voltage. Due to the large amount of highly active surface area, the porous Ni–Pt alloys showed a significantly higher current density than untreated samples in hydrogen evolution reactions. Based on cyclic voltammetry measurements, it was demonstrated that the electrochemically active surface area was highest for the modified Ni–Pt electrode. The Pt-modified sample with Al deposition at −1.8 V and a molten salt temperature of 900 °C generated the highest amount of hydrogen (9.38 mL). © 2023 Hydrogen Energy Publications LLC

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