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Low-Temperature controlled synthesis of nanocast mixed metal oxide spinels for enhanced OER activity

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Title
Low-Temperature controlled synthesis of nanocast mixed metal oxide spinels for enhanced OER activity
Author(s)
Guggenberger, Patrick; Priamushko, Tatiana; Patil, Prathamesh; Florek, Justyna; Garstenauer, Daniel; Mautner, Andreas; Jae Won Shin; Ryoo, Ryong; Pichler, Christian M.; Kleitz, Freddy
Publication Date
2024-05
Journal
Journal of Colloid and Interface Science, v.661, pp.574 - 587
Publisher
Academic Press
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. © 2024 The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/14892
DOI
10.1016/j.jcis.2024.01.056
ISSN
0021-9797
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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