Weikai Xiang, Nating Yang, Xiaopeng Li, Julia Linnemann, Ulrich Johannes Hagemann, Olaf Rüdiger, Markus Heidelmann, Tobias Falk, Matteo Aramini, Serena DeBeer, Martin Muhler, Kristina Tschulik, Tong Li
- The three-dimensional (3D) distribution of individual atoms on the surface of catalyst nanoparticles plays a vital role in their activity and stability. Optimising the performance of electrocatalysts requires atomic-scale information, but it is difficult to obtain. Here, we use atom probe tomography to elucidate the 3D structure of 10 nm sized \(Co_{2}FeO_{4}\) and \(CoFe_{2}O_{4}\) nanoparticles during oxygen evolution reaction (OER). We reveal nanoscale spinodal decomposition in pristine \(Co_{2}FeO_{4}\). The interfaces of Co-rich and Fe-rich nanodomains of \(Co_{2}FeO_{4}\) become trapping sites for hydroxyl groups, contributing to a higher OER activity compared to that of \(CoFe_{2}O_{4}\). However, the activity of \(Co_{2}FeO_{4}\) drops considerably due to concurrent irreversible transformation towards \(Co^{IV}O_{2}\) and pronounced Fe dissolution. In contrast, there is negligible elemental redistribution for \(CoFe_{2}O_{4}\) after OER, except for surface structural transformation towards (\(Fe^{III}, Co^{III})_{2}O_{3}\). Overall, our study provides a unique 3D compositional distribution of mixed Co-Fe spinel oxides, which gives atomic-scale insights into active sites and the deactivation of electrocatalysts during OER.
MetadatenAuthor: | Weikai XiangGND, Nating YangGND, Xiaopeng LiORCiD, Julia LinnemannORCiDGND, Ulrich Johannes HagemannORCiDGND, Olaf RüdigerORCiDGND, Markus HeidelmannORCiDGND, Tobias FalkGND, Matteo AraminiGND, Serena DeBeerORCiDGND, Martin MuhlerORCiDGND, Kristina TschulikORCiDGND, Tong LiORCiDGND |
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URN: | urn:nbn:de:hbz:294-103317 |
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DOI: | https://doi.org/10.1038/s41467-021-27788-2 |
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Parent Title (English): | Nature communications |
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Publisher: | Nature Publishing Group UK |
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Place of publication: | London |
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Document Type: | Article |
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Language: | English |
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Date of Publication (online): | 2023/11/03 |
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Date of first Publication: | 2022/01/10 |
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Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
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Tag: | Open Access Fonds |
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Volume: | 13 |
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Issue: | Article 179 |
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First Page: | 179-1 |
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Last Page: | 179-14 |
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Note: | Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum. |
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Institutes/Facilities: | Institut für Werkstoffe |
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Dewey Decimal Classification: | Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften, Maschinenbau |
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open_access (DINI-Set): | open_access |
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faculties: | Fakultät für Maschinenbau |
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Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |
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