A Route to Complex Materials Consisting of Multiple Crystalline Phases Ir‐Ru‐IrxRu1‐xO2 as Multifunctional Electrocatalysts

Author:

Knani Sarra1,Hajjar Perla1,Lacour Marie‐Agnès2,van der Lee Arie1,Oliviero Erwan34,Petit Eddy1,Flaud Valerie3,Cambedouzou Julien15,Tingry Sophie15,Napporn Teko W.56,Cornu David15,Holade Yaovi15ORCID

Affiliation:

1. Institut Européen des Membranes, IEM, UMR 5635, Univ Montpellier, ENSCM CNRS Montpellier 34090 France

2. ChemLab École Nationale Supérieure de Chimie de Montpellier (ENSCM) Montpellier 34296 France

3. Institut Charles Gerhardt, ICGM, UMR 5253, Univ Montpellier, ENSCM CNRS Montpellier 34293 France

4. MEA Platform Université de Montpellier Montpellier 34090 France

5. French Research Network on Hydrogen (FRH2), Research Federation No. 2044 Centre national de la recherche scientifique (CNRS) Nantes 44322 France

6. Department of Chemistry IC2MP CNRS UMR 7285 Université de Poitiers Poitiers, Cedex 9 86073 France

Abstract

AbstractThe synthesis of catalytic materials containing active sites of various oxidation states (metal, oxide, etc.) for the dual use in reduction and oxidation reactions remains challenging because most of the reported methods for the metallic state are often incompatible with those for the oxide state. A new methodology is reported for the synthesis of a library of bimetallic metal‐oxide materials containing three crystalline phases Ir‐Ru‐IrxRu1‐xO2 by combining the calcination under air and the polymerization of aniline in the presence of IrCl3 and RuCl3 precursors. Morphology, structure, and surface oxidation state studies (XRD, SEM/EDX, S/TEM, XPS) confirm the hypothesis that IrCl3 evolves to Ir while RuCl3 evolves to RuO2 during the calcination under air. An Ir:Ru atomic ratio of 50:50 can be converted into a heterogeneous nanostructure composed of Ir, Ru, and IrxRu1‐xO2 to date, with remarkable catalytic activity for both hydrogen evolution reaction (HER) with a small overpotential of 40 mV and oxygen evolution reaction (OER) with a small overpotential of 290 mV at the metric current density of 10 mA cm−2 in 0.5 m H2SO4. The results can serve as a platform for the development of efficient multifunctional materials for practical use in both catalytic oxidation and reduction reactions.

Publisher

Wiley

Subject

Mechanical Engineering,Mechanics of Materials

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