A trimetallic organometallic precursor for efficient water oxidation

Title
A trimetallic organometallic precursor for efficient water oxidation
Authors
채근화Sepideh MadadkhaniReza Babadi AghakhanpourJitendra Pal SinghRobabeh BagheriZhenlun SongMohammad Mahdi Najafpour
Keywords
iron/nickel/zinc mixed oxide; electrochemical water oxidation; catalyst
Issue Date
2019-03
Publisher
Scientific Reports
Citation
VOL 9-3734-8
Abstract
Herein, we report an iron/nickel/zinc mixed oxide as a catalyst for the electrochemical water oxidation. This catalyst was synthesized by a straightforward method for the synthesis of an iron/nickel/zinc mixed oxide through the calcination of a Fe/Ni/Zn organometallic compound. The calcined product contains Fe and Ni as crucial ions for water oxidation, accompanied by the presence of Zn ions. The removal of Zn ions from the mixed oxide provides more active sites on the surface of the catalyst. The composition of the compound was characterized by some common methods and found to be an efficient wateroxidizing catalyst. The catalyst on FTO at pH = 13 yields a current density of 12 mA/cm2 at 1.2 V (vs. Ag│AgCl). After 5 hours at 1.1 V, the electrode not only shows no decrease in performance, but also shows an increase from 4 to 7 mA/cm2 in the water oxidation activity. Tafel plot, for the electrode at pH = 13 in KOH solution (0.1 M) showed linearity for the graph of lg j vs. V with both relatively low (220.4 mV per decade) and high overpotentials (903.7 mV per decade).
URI
http://pubs.kist.re.kr/handle/201004/70147
ISSN
2045-2322
Appears in Collections:
KIST Publication > Article
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