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DS: Fachverband Dünne Schichten
DS 9: Focus Session: 2D Transition Metal Carbides, Nitrides and Carbonitrides I (joint session DS/MM/O)
DS 9.5: Talk
Wednesday, March 20, 2024, 16:30–16:45, A 053
MXenes as support for transition metal oxides electrocatalysts for water splitting application — •Axel Zuber1, Zdeněk Sofer2, and Michelle Browne1 — 1CE-NESD, Helmholtz Zentrum Berlin für Materialien und Energie, Berlin (Federal Republic of Germany) — 2Department of Inorganic Chemistry, University of Chemistry and Technology, Prague (Czeck Republic)
To reduce the cost of energy conversion and tend towards a greener energy production, research has been trying to use first-row transition metal-based catalysts for water splitting. Despite their good activity for the oxygen evolution reaction, transition metal oxides (TMOs) performance is hindered by their low conductivity and instability under potential. To improve it, recent works have successfully combined them chemically with conductive 2D transition metal carbides and nitrides (MXenes). The rich chemistry, large surface area and conductivity of MXenes make them excellent candidates as electrocatalyst supports, but they are also keen to oxidize in water which induces a loss of these properties. In this study, different MXenes were combined with transition metal oxides and tested as electrodes for the oxygen evolution reaction. The stability of the MXene structure as well as the resulting compound performance for the oxygen evolution reaction were investigated. The electrode materials remained stable and allowed to improve the oxygen evolution reaction overpotential of the transition metal oxide.
Keywords: MXene; stability; electrocatalysis; water splitting; transition metal oxides