Boosting the oxygen evolution reaction performance of Ni‐Fe‐electrodes by tailored conditioning

Gohlke, Clara ; Gallenberger, Julia ; Niederprüm, Nico ; Ingendae, Hannah ; Kautz, Johann ; Hofmann, Jan P. ; Mechler, Anna K. (2024)
Boosting the oxygen evolution reaction performance of Ni‐Fe‐electrodes by tailored conditioning.
In: ChemElectroChem, 11 (18)
doi: 10.1002/celc.202400318
Artikel, Bibliographie

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Kurzbeschreibung (Abstract)

To meet the rising demand for green hydrogen, efficient alkaline water electrolysis demands highly active and low‐cost electrocatalysts for the oxygen evolution reaction (OER). We address this issue by focusing our work on optimizing the conditioning of promising Ni‐(Fe)‐based electrodes to improve their electrocatalytic performances. Systematic parameter variation for cyclic voltammetry conditioning revealed that a large potential window, low scan rate, and a high number of cycles result in improved activation. If the conditioning time is fixed, a high scan rate was found beneficial. A remarkable 47±6 mV potential drop at 10 mA cm⁻² was achieved for Ni₇₀Fe₃₀ when conditioning between −0.35–1.6 V at 100 mV s⁻¹ for just 30 min. We could demonstrate that this activation persisted over 100 h at 100 mA cm⁻², underscoring its enduring efficacy. We suggest that this activation effect results from the growth of a hydrous hydroxide layer, which is supported by energy dispersive X‐ray spectroscopy and X‐ray photoelectron spectroscopy. Fe incorporation or dissolution played only a minor role in the differences in electrode activation, as demonstrated by variation of the Fe content in the electrolyte. Our work stresses the importance of conditioning in enhancing OER performance and explores how to improve the catalysts′ effectiveness by tailoring oxides.

Typ des Eintrags:

Artikel

Erschienen:

2024

Autor(en):

Gohlke, Clara ; Gallenberger, Julia ; Niederprüm, Nico ; Ingendae, Hannah ; Kautz, Johann ; Hofmann, Jan P. ; Mechler, Anna K.

Art des Eintrags:

Bibliographie

Titel:

Boosting the oxygen evolution reaction performance of Ni‐Fe‐electrodes by tailored conditioning

Sprache:

Englisch

Publikationsjahr:

16 September 2024

Ort:

Weinheim

Verlag:

Wiley-VCH

Titel der Zeitschrift, Zeitung oder Schriftenreihe:

ChemElectroChem

Jahrgang/Volume einer Zeitschrift:

(Heft-)Nummer:

Kollation:

11 Seiten

DOI:

10.1002/celc.202400318

Zugehörige Links:

Kurzbeschreibung (Abstract):

Alternatives oder übersetztes Abstract:

Alternatives Abstract

Sprache

Cost-efficient, active, and stable electrodes for the alkaline oxygen evolution reaction remain a challenge. Herein, electrochemical conditioning of Ni−Fe-based electrodes is introduced as a promising design method. Conditioning was optimized regarding scan rate, potential limits, hold times, and treatment time. After 100 h operation at 100 mA cm⁻², the overpotential was 320 mV lower than that of an unconditioned electrode.

Englisch

Freie Schlagworte:

alkaline water electrolysis, electrocatalyst preparation, in-situ electrode conditioning, electrode activation, online dissolution

ID-Nummer:

Artikel-ID: e202400318

Sachgruppe der Dewey Dezimalklassifikatin (DDC):

500 Naturwissenschaften und Mathematik > 540 Chemie
600 Technik, Medizin, angewandte Wissenschaften > 660 Technische Chemie

Fachbereich(e)/-gebiet(e):

11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Oberflächenforschung

Hinterlegungsdatum:

06 Nov 2024 09:30

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