Compositional Engineering of Ti<sub>3</sub>C<sub>2</sub>T<sub><i>x</i></sub> MXene-NiMoO<sub>4</sub> Hybrid Nanostructures for Enhanced Electrocatalytic Water Oxidation
A critical step in realizing the vision of green hydrogen through water splitting is to design oxygen evolution reaction (OER) catalysts that showcase a good balance of activity and stability. This work reports the compositional tuning of a NiMoO<sub>4</sub> material and then the subsequent varying of Ti<sub>3</sub>C<sub>2</sub>T <sub><i>x</i></sub> MXene with the NiMoO<sub>4</sub> hybrid nanostructures as OER catalysts in alkaline media. In this work, the optimum NiMoO<sub>4</sub> hybrid catalyst retained good stability over 24 h of chronopotentiometry on industrial relevant supports (Ni Felt) with an overpotential value of ca. 339 mV at 100 mA cm<sup>-2</sup>. Operando Raman spectroscopy revealed that catalytically active β-NiOOH species are formed during OER in NiMoO<sub>4</sub> at lower overpotentials than for pure NiO and that a higher amount of the β-NiOOH was found in the 5% MXene loading. The ICP-OES analysis showed that Mo dissolution follows a volcano trend with MXene loading (peaking at 5 wt %) before decreasing at 10 wt %. Overall, these results hold great promises for rational design strategies for MXene-supported water oxidation catalysts in alkaline electrolytes.
Authors
- Kai Steffen Exner (ORCID: https://orcid.org/0000-0003-2934-6075)
- Karuppasamy Dharmaraj (ORCID: https://orcid.org/0000-0001-6743-3503)
- Saeed Sajjadi (ORCID: https://orcid.org/0000-0002-4308-4916)
- Thorsten Schultz (ORCID: https://orcid.org/0000-0002-0344-6302)
- Nigel A. Marks (ORCID: https://orcid.org/0000-0003-2372-1284)
- Danielle Douglas-Henry (ORCID: https://orcid.org/0000-0003-1552-2197)
- Valeria Nicolosi (ORCID: https://orcid.org/0000-0002-7637-4813)
- Aline Alencar Emerenciano (ORCID: https://orcid.org/0000-0002-8082-8988)
- Michelle Phillippa Browne (ORCID: https://orcid.org/0000-0002-3574-9113)
- Norbert Koch (ORCID: https://orcid.org/0000-0002-6042-6447)
- C. Kaplan (ORCID: https://orcid.org/0009-0006-0041-8919)
Institutions
- Trinity College Dublin (IE)
- Helmholtz-Zentrum Berlin für Materialien und Energie (DE)
- Humboldt-Universität zu Berlin (DE)
- Advanced Materials and BioEngineering Research (IE)
- Trencianska Univerzita Alexandra Dubceka V Trencine (SK)
- Institut für Technische und Angewandte Physik (Germany) (DE)
- University of Duisburg-Essen (DE)
Publication Details
- Journal
- ACS Applied Energy Materials
- Published
- 2025-07-25
- DOI
- https://doi.org/10.1021/acsaem.5c01467
- Citations
- 2
- Primary Topic
- MXene and MAX Phase Materials
- Type
- article
- Field-Weighted Citation Impact
- 1.04
Funders
- Science Foundation Ireland
- Deutscher Akademischer Austauschdienst
- Deutsche Forschungsgemeinschaft
- Bundesministerium für Bildung und Forschung
- Helmholtz Association
- Horizon 2020 Framework Programme
- European Research Council