Hydrogen evolution and corrosion products on iron cathodes in hot alkaline solution
PBN-AR
Instytucja
Instytut Chemii Fizycznej Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
ISSN
0360-3199
EISSN
Wydawca
PERGAMON-ELSEVIER SCIENCE LTD
DOI
URL
Rok publikacji
2014
Numer zeszytu
8
Strony od-do
3597-3605
Numer tomu
39
Identyfikator DOI
Liczba arkuszy
Autorzy
(liczba autorów: 2)
Słowa kluczowe
en
water electrolysis
hot caustic
iron cathode
hydrogen entry.
Streszczenia
Język
en
Treść
To better understand the reactivation of nickel cathodes by iron, the study was performed on iron membranes in 25% KOH at 80oC. Membranes were cathodically treated and anodically polarised, and simultaneously hydrogen permeation was measured with the electrochemical technique. During cathodic potential sweeps, three peaks of current and of hydrogen permeation occurred. The peaks at about -0.80 V and -1.30 V vs. SHE were ascribed to reduction of Fe3O4 to HFeO2- and H+, and of HFeO2- to Fe, respectively. Electric charge of anodic oxidation of cathodically pretreated membranes was by over two orders of magnitude higher than the charge of desorbing hydrogen, and it increased with the pretreatment time. This was ascribed mainly to the oxidation of iron and its corrosion products. It was proposed that the reactivating effect of iron on Ni cathodes can be associated with the enhanced reactivity of iron freshly deposited by reduction of HFeO2-.
Cechy publikacji
ORIGINAL_ARTICLE
Inne
System-identifier
610264
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