Projects per year
Abstract
For efficient catalysis and electrocatalysis well‐designed, high‐surface‐area support architectures covered with highly dispersed metal nanoparticles with good catalyst‐support interactions are required. In situ grown Ni nanoparticles on perovskites have been recently reported to enhance catalytic activities in high‐temperature systems such as solid oxide cells (SOCs). However, the micrometer‐scale primary particles prepared by conventional solid‐state reactions have limited surface area and tend to retain much of the active catalytic element within the bulk, limiting efficacy of such exsolution processes in low‐temperature systems. Here, a new, highly efficient, solvothermal route is demonstrated to exsolution from smaller scale primary particles. Furthermore, unlike previous reports of B‐site exsolution, it seems that the metal nanoparticles are exsolved from the A‐site of these perovskites. The catalysts show large active site areas and strong metal‐support interaction (SMSI), leading to ≈26% higher geometric activity (25 times higher mass activity with 1.4 V of Eon‐set) and stability for oxygen‐evolution reaction (OER) with only 0.72 µg base metal contents compared to typical 20 wt% Ni/C and even commercial 20 wt% Ir/C. The findings obtained here demonstrate the potential design and development of heterogeneous catalysts in various low‐temperature electrochemical systems including alkaline fuel cells and metal–air batteries.
Original language | English |
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Article number | 1903693 |
Number of pages | 6 |
Journal | Advanced Energy Materials |
Volume | 10 |
Issue number | 10 |
Early online date | 30 Jan 2020 |
DOIs | |
Publication status | Published - 10 Mar 2020 |
Keywords
- Perovskite
- Exsolution
- Hydration
- Electrocatalysis
- Oxygen evolution reaction
Fingerprint
Dive into the research topics of 'Replacement of Ca by Ni in a perovskite titanate to yield a novel perovskite exsolution architecture for oxygen-evolution reactions'. Together they form a unique fingerprint.Projects
- 4 Finished
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Critical Mass: Emergrent Nanomaterials (Critcal Mass Proposal)
Irvine, J. T. S. (PI), Connor, P. A. (CoI) & Savaniu, C. D. (CoI)
1/06/18 → 31/01/23
Project: Standard
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Electon Microscopy: Electon Microscopy for the characterisation and manipulation of advanced function materials and their interfaces at the nanoscale
Irvine, J. T. S. (PI), Baker, R. (CoI) & Zhou, W. (CoI)
1/04/18 → 2/09/20
Project: Standard
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Multiscale tuning of interfaces: Multiscale tuning of interfaces and surfaces for energy applications
Irvine, J. T. S. (PI), Cassidy, M. (CoI) & Savaniu, C. D. (CoI)
1/01/17 → 30/06/21
Project: Standard
Datasets
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Replacement of Ca by Ni in a Perovskite Titanate to Yield a Novel Perovskite Exsolution Architecture for Oxygen-Evolution Reactions (dataset)
Lee, J. (Creator), Myung, J.-H. (Contributor), Naden, A. B. (Contributor), Jeon, O. S. (Contributor), Shul, Y. G. (Contributor) & Irvine, J. T. S. (Owner), University of St Andrews, 30 Jan 2020
DOI: 10.17630/736ee412-dd08-4148-8357-707643dbeb0d, https://doi.org/10.1002/aenm.201903693
Dataset
File