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Bifunctional nanostructured palladium/MoSx electrocatalyst for cathode hydrogen evolution reaction PEM water electrolysis and oxygen reduction reaction
Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, Athens, Greece.
Department of Chemistry, University of Ioannina, Ioannina, Greece.
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.
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2023 (English)In: Advanced Sustainable Systems, E-ISSN 2366-7486, Vol. 7, no 5, article id 2200518Article in journal (Refereed) Published
Abstract [en]

The creation of effective Pd-based architectures with numerous electrocatalytic active sites and efficient charge transfer is of key importance for improving the electrocatalytic performance in water electrolyzer and fuel cell applications. On the other hand, MoS2, possessing multiple electrocatalytic active sites, can act both as support and booster to Pd-based electrocatalytic structures. Herein, MoSx@Pd hybrids were successfully synthesized by using a one-pot liquid phase solvothermal strategy with stoichiometric excess of Pd. The optimized MoSx@Pd proves to be an excellent bifunctional electrocatalyst for both hydrogen evolution reaction and oxygen reduction reaction (ORR). Optimized MoSx@Pd operates the process for hydrogen evolution at the same potential as Pt/C and achieves a low overpotential of 76 mV at −10 mA cm−2 due to improved reaction kinetics and charge transfer processes between Pd and MoS2. On top of that, MoSx@Pd exhibits excellent performance and stability as cathode electrocatalyst in a polymer electrolyte membrane water electrolyzer. Simultaneously, the bifunctional electrocatalyst shows enhanced electrocatalytic ORR activity and stability by maintaining 93% of its initial activity outperforming commercial Pt/C. Finally, rotating ring disk electrode analysis reveals that ORR proceeds through the energy efficient 4e− pathway, with water being the main product, rendering MoSx@Pd a promising component for fuel cells.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2023. Vol. 7, no 5, article id 2200518
Keywords [en]
electrocatalyst, hydrogen evolution reaction, oxygen reduction reaction, polymer electrolyte membranes, transition metal dichalcogenides, water electrolysis
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-204762DOI: 10.1002/adsu.202200518ISI: 000921356300001Scopus ID: 2-s2.0-85147315186OAI: oai:DiVA.org:umu-204762DiVA, id: diva2:1738123
Funder
Swedish Research Council, 2018-03937The Kempe Foundations, JCK-2132The Kempe Foundations, JCK-2021Carl Tryggers foundation , CTS 21–1581Available from: 2023-02-21 Created: 2023-02-21 Last updated: 2023-06-19Bibliographically approved

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Perivoliotis, Dimitrios K.Piñeiro-García, AlexisGracia-Espino, Eduardo

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