LOUPIAS, Lola; BOULÉ, Roald; MORAIS, Cláudia; MAUCHAMP, Vincent; GUIGNARD, Nadia; ROUSSEAU, Julie; PACAUD, Jérôme; CHARTIER, Patrick; GAUDON, Manuel; COUTANCEAU, Christophe; CÉLÉRIER, Stéphane; HABRIOUX, Aurélien

doi:10.1088/2053-1583/acbfcb

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LOUPIAS, Lola
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]

BOULÉ, Roald
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]

MORAIS, Cláudia
Institut de chimie des milieux et matériaux de Poitiers [UMR 7285] [IC2MP [Poitiers]]

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Ce document a été publié dans

2D Materials. 2023, vol. 10, n° 2, p. 024005

IOP Publishing

Résumé en anglais

A polyol-assisted solvothermal route is used to synthesize Ni x Fe y nanoalloys supported on a highly electron conductive 2D transition metal Mo 2 CT x MXene. Structural, morphological and chemical characteristics of the materials are determined using several physicochemical techniques. The MXene support allows not only the formation of a nanostructured metallic Ni x Fe y nanoalloys, but also favors the interfacial charge transfer for the OER. The Ni x Fe y @Mo 2 CT x material with a Ni/Fe ratio of 2.66 leads to the outstanding activity for the OER with an amazingly low Tafel slope value of 34 mV dec-1 and a current density of 10 mA.cm-2 at a potential of only 1.50 V vs. RHE. In situ Raman experiments show that β-NiOOH formed by oxidation of the nanoalloys under positive scan, likely containing a very small amount of Fe, is the active phase for the OER. This material exhibits also an excellent stability over 168 h in a 5 M KOH electrolyte. TEM-EELS analyses after 100 voltammetric cycles between 0.2 to 2 1.55 V vs. RHE evidence for the first time that the MXene support is not fully oxidized in the first cycle. Also, oxyhydroxide layer formed in the OER potential region at the surface of the Ni x Fe y nanoparticles can be reversibly reduced.< Réduire

Mots clés en anglais

MXene

nickel-iron alloy

molybdenum carbide

oxygen evolution reaction

polyol synthesis route

DOI

http://dx.doi.org/10.1088/2053-1583/acbfcb

Project ANR

Synthèse et fonctionnalisation de nouveaux carbures de métaux de transition 2D (MXENE) : application pour l'électroCATalyse de l'oxygène - ANR-18-CE08-0014
Poitiers Graduate School on physico-chemical properties of INTerfaces for AeRonautic, Energy and Environment - ANR-18-EURE-0010

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Importé de hal

Unités de recherche

Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB) - UMR 5026