Hydrogen evolution on plasma carburised nickel and effect of iron deposition from the electrolyte in alkaline water electrolysis
PBN-AR
Instytucja
Instytut Chemii Fizycznej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Electrochimica Acta
ISSN
0013-4686
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
61-68
Numer tomu
167
Link do pełnego tekstu
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Autorzy
Pozostali autorzy
+ 1
Słowa kluczowe
en
Water electrolysis;
Carburised nickel;
Anodic activation;
Iron deposition
Streszczenia
Język
en
Treść
Presence of carbon in electrodeposited nanocrystalline Ni-Fe-C cathodes renders a high electroactivity for hydrogen evolution reaction (HER) in hot alkaline solutions. In the present work carbon was introduced into nickel cathodes by plasma treatment in CH4 + H2 gas mixture at 470 °C. Electrochemical measurements were carried out in the solution of 25 wt.% KOH (reagent p.a.) at 80 °C. In some measurements the solution was pre-electrolysed to remove heavy metals. Carburisation resulted in a significant enhancement of catalytic activity of nickel for HER during short cathodic polarisation. Later, differences between the materials almost disappeared, evidently due to deposition of iron and of other heavy metals from the solution. Cathodes with iron deposits underwent an activation following anodic polarisation. It was proposed that the activating effect of iron can be associated with the formation of highly reactive iron during cathodic reduction of oxide species (probably Fe(OH)42−). The activating effect of prior anodic polarisation can be due to the formation of large amounts of oxide species which can undergo the reduction to reactive iron.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
636826
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