Titel
Low-Temperature controlled synthesis of nanocast mixed metal oxide spinels for enhanced OER activity
Autor*in
Prathamesh Patil
CEST Centre of Electrochemical and Surface Technology
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Abstract
The controlled cation substitution is an effective strategy for optimizing the density of states and enhancing the electrocatalytic activity of transition metal oxide catalysts for water splitting. However, achieving tailored mesoporosity while maintaining elemental homogeneity and phase purity remains a significant challenge, especially when aiming for complex multi-metal oxides. In this study, we utilized a one-step impregnation nanocasting method for synthesizing mesoporous Mn-, Fe-, and Ni-substituted cobalt spinel oxide (Mn0.1Fe0.1Ni0.3Co2.5O4, MFNCO) and demonstrate the benefits of low-temperature calcination within a semi-sealed container at 150–200 °C. The comprehensive discussion of calcination temperature effects on porosity, particle size, surface chemistry and catalytic performance for the alkaline oxygen evolution reaction (OER) highlights the importance of humidity, which was modulated by a pre-drying step. The catalyst calcined at 170 °C exhibited the lowest overpotential (335 mV at 10 mA cm−2), highest current density (433 mA cm−2 at 1.7 V vs. RHE, reversible hydrogen electrode) and further displayed excellent stability over 22 h (at 10 mA cm−2). Furthermore, we successfully adapted this method to utilize cheap, commercially available silica gel as a hard template, yielding comparable OER performance. Our results represent a significant progress in the cost-efficient large-scale preparation of complex multi-metal oxides for catalytic applications.
Stichwort
Water electrolysisOxygen evolution reactionMixed metal oxidesSpinelNanocastingLow-energy ion scatteringElectrochemical stability
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:2082517
Erschienen in
Titel
Journal of Colloid and Interface Science
Band
661
ISSN
0021-9797
Erscheinungsdatum
2024
Seitenanfang
574
Seitenende
587
Publication
Elsevier BV
Fördergeber
Europäische Union (alle Programme) — 542638
Erscheinungsdatum
2024
Zugänglichkeit
Rechte
Rechteangabe
© 2024 The Author(s)
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