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Monitoring the hydrothermal growth of cobalt spinel water oxidation catalysts - from preparative history to catalytic activity
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Reith, Lukas, Lienau, Karla, Cook, Daniel Sean, Moré, René, Walton, Richard I. and Patzke, Greta Ricarda (2018) Monitoring the hydrothermal growth of cobalt spinel water oxidation catalysts - from preparative history to catalytic activity. Chemistry - A European Journal, 24 (69). pp. 18424-18435. doi:10.1002/chem.201801565 ISSN 1521-3765.
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Official URL: https://doi.org/10.1002/chem.201801565
Abstract
The hydrothermal growth of cobalt oxide spinel (Co₃O₄) nanocrystals from cobalt acetate precursors was monitored with in situ powder X‐ray diffraction (PXRD) in combination with ex situ electron microscopy and vibrational spectroscopy. Kinetic data from in situ PXRD monitoring were analyzed using Sharp‐Hancock and Gualtieri approaches, which both clearly indicate a change of the growth mechanism for reaction temperatures above 185°C. This mechanistic transition goes hand in hand with morphology changes that notably influence the photocatalytic oxygen evolution activity. Complementary quenching investigations of conventional hydrothermal Co₃O₄ growth demonstrate that these insights derived from in situ PXRD data provide valuable synthetic guidelines for water oxidation catalyst production. Furthermore, the ex situ analyses of hydrothermal quenching experiments were essential to assess the influence of amorphous cobalt‐containing phases arising from the acetate precursor on the catalytic activity. Thereby, we illustrate how the efficient combination of a single in situ technique with ex situ analyses paves the way to optimize parameter‐sensitive hydrothermal production processes of key energy materials.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QD Chemistry Q Science > QE Geology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | |||||||||
| SWORD Depositor: | Library Publications Router | |||||||||
| Library of Congress Subject Headings (LCSH): | Hydrothermal alteration, Cobalt compounds, Spinel | |||||||||
| Journal or Publication Title: | Chemistry - A European Journal | |||||||||
| Publisher: | Wiley - V C H Verlag GmbH & Co. KGaA | |||||||||
| ISSN: | 1521-3765 | |||||||||
| Official Date: | 10 December 2018 | |||||||||
| Dates: |
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| Volume: | 24 | |||||||||
| Number: | 69 | |||||||||
| Page Range: | pp. 18424-18435 | |||||||||
| DOI: | 10.1002/chem.201801565 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||
| Date of first compliant deposit: | 1 June 2018 | |||||||||
| Date of first compliant Open Access: | 23 May 2019 | |||||||||
| RIOXX Funder/Project Grant: |
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