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Oxygen-evolution reaction by nickel/nickel oxide interface in the presence of ferrate(VI).


ABSTRACT: In this study, we investigate the effect of K2FeO4, as a new and soluble Fe salt at alkaline conditions, on oxygen-evolution reaction (OER) of Ni oxide. Both oxidation and reduction peaks for Ni in the presence and absence of Fe are linearly changed by (scan rate)1/2. Immediately after the interaction of [FeO4]2- with the surface of the electrode, a significant increase in OER is observed. This could be indicative of the fact that either the [FeO4]2- on the surface of Ni oxide is directly involved in OER, or, it is important to activate Ni oxide toward OER. Due to the change in the Ni(II)/(III) peak, it is hypothesized that Fe impurity in KOH or electrochemical cell has different effects at the potential range. At low potential, [FeO4]2- is reduced on the surface of the electrode, and thus, is significantly adsorbed on the electrode. Finally, oxygen-evolution measurements of K2FeO4 and Ni2O3 are investigated under chemical conditions. K2FeO4 is not stable in the presence of Ni(II) oxide, and OER is observed in a KOH solution (pH???13).

SUBMITTER: Ali Akbari MS 

PROVIDER: S-EPMC7260238 | biostudies-literature | 2020 May

REPOSITORIES: biostudies-literature

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Oxygen-evolution reaction by nickel/nickel oxide interface in the presence of ferrate(VI).

Ali Akbari Mohammad Saleh MS   Bagheri Robabeh R   Song Zhenlun Z   Najafpour Mohammad Mahdi MM  

Scientific reports 20200529 1


In this study, we investigate the effect of K<sub>2</sub>FeO<sub>4</sub>, as a new and soluble Fe salt at alkaline conditions, on oxygen-evolution reaction (OER) of Ni oxide. Both oxidation and reduction peaks for Ni in the presence and absence of Fe are linearly changed by (scan rate)<sup>1/2</sup>. Immediately after the interaction of [FeO<sub>4</sub>]<sup>2-</sup> with the surface of the electrode, a significant increase in OER is observed. This could be indicative of the fact that either the  ...[more]

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