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

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.

SUBMITTER: Sengupta D 

PROVIDER: S-EPMC9055272 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Ni foam electrode solution impregnated with Ni-Fe <sub><i>X</i></sub> (OH) <sub><i>Y</i></sub> catalysts for efficient oxygen evolution reaction in alkaline electrolyzers.

Sengupta Dipanjan D   Privitera Stefania M S SMS   Milazzo Rachela Gabriella RG   Bongiorno Corrado C   Scalese Silvia S   Lombardo Salvatore S  

RSC advances 20200703 43

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) <sub><i>X</i></sub> ), wet chemically synthesized as OER catalysts. The prepared catalyst based on iron hydroxide precipitate shows a promising performance, ex  ...[more]

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