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Issue 43, 2020, Issue in Progress
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Ni foam electrode solution impregnated with Ni-FeX(OH)Y catalysts for efficient oxygen evolution reaction in alkaline electrolyzers

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Abstract

Oxygen evolution reaction (OER) is a demanding step within the water splitting process for its requirement of a high overpotential. Thus, to overcome this unfavourable kinetics, an efficient catalyst is required to expedite the process. In this context, we report on Ni foam functionalised with low cost iron (Fe) and iron hydroxide (Fe(OH)X), wet chemically synthesized as OER catalysts. The prepared catalyst based on iron hydroxide precipitate shows a promising performance, exhibiting an overpotential of 270 mV (at a current density of 10 mA cm−2 in 1 M KOH solution), an efficient Tafel slope of ∼50 mV dec−1 and stable chronopotentiometry. The promising performance of the anode was further reproduced in the overall water splitting reaction with a two electrode cell. The overall reaction requires a lower potential of 1.508 V to afford 10 mA cm−2, corresponding to 81.5% electrical to fuel efficiency.

Graphical abstract: Ni foam electrode solution impregnated with Ni-FeX(OH)Y catalysts for efficient oxygen evolution reaction in alkaline electrolyzers

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Supplementary files

Article information


Submitted
29 Apr 2020
Accepted
28 Jun 2020
First published
03 Jul 2020

This article is Open Access

RSC Adv., 2020,10, 25426-25434
Article type
Paper

Ni foam electrode solution impregnated with Ni-FeX(OH)Y catalysts for efficient oxygen evolution reaction in alkaline electrolyzers

D. Sengupta, S. M. S. Privitera, R. G. Milazzo, C. Bongiorno, S. Scalese and S. Lombardo, RSC Adv., 2020, 10, 25426
DOI: 10.1039/D0RA03856C

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