Tailoring Pore Size and Catalytic Activity in Cobalt Iron Layered Double Hydroxides and Spinels by Microemulsion-Assisted pH-Controlled Co-Precipitation.

Autor: Rabe A; Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141, Essen, Germany.; Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 2, 24118, Kiel, Germany., Jaugstetter M; Faculty of Chemistry and Biochemistry, Analytical Chemistry II, Ruhr University Bochum, 44801, Bochum, Germany., Hiege F; Faculty of Chemistry and Biochemistry, Analytical Chemistry II, Ruhr University Bochum, 44801, Bochum, Germany., Cosanne N; Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 2, 24118, Kiel, Germany., Ortega KF; Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 2, 24118, Kiel, Germany., Linnemann J; Faculty of Chemistry and Biochemistry, Analytical Chemistry II, Ruhr University Bochum, 44801, Bochum, Germany., Tschulik K; Faculty of Chemistry and Biochemistry, Analytical Chemistry II, Ruhr University Bochum, 44801, Bochum, Germany., Behrens M; Faculty of Chemistry, University of Duisburg-Essen and Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstr. 7, 45141, Essen, Germany.; Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 2, 24118, Kiel, Germany.; Ertl Center for Electrochemistry and Catalysis, Gwangju Institute of Science (GIST), 123 Cheomdan-gwagiro (Oryang-dong), Buk-gu, Gwangju, 500-712, South Korea.
Jazyk: angličtina
Zdroj: ChemSusChem [ChemSusChem] 2023 May 19; Vol. 16 (10), pp. e202202015. Date of Electronic Publication: 2023 Mar 29.
DOI: 10.1002/cssc.202202015
Abstrakt: Cobalt iron containing layered double hydroxides (LDHs) and spinels are promising catalysts for the electrochemical oxygen evolution reaction (OER). Towards development of better performing catalysts, the precise tuning of mesostructural features such as pore size is desirable, but often hard to achieve. Herein, a computer-controlled microemulsion-assisted co-precipitation (MACP) method at constant pH is established and compared to conventional co-precipitation. With MACP, the particle growth is limited and through variation of the constant pH during synthesis the pore size of the as-prepared catalysts is controlled, generating materials for the systematic investigation of confinement effects during OER. At a threshold pore size, overpotential increased significantly. Electrochemical impedance spectroscopy (EIS) indicated a change in OER mechanism, involving the oxygen release step. It is assumed that in smaller pores the critical radius for gas bubble formation is not met and therefore a smaller charge-transfer resistance is observed for medium frequencies.
(© 2023 The Authors. ChemSusChem published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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