Skip to content

Research at St Andrews

Exsolution of catalytically active iridium nanoparticles from strontium titanate

Research output: Contribution to journalArticle


Open Access Status

  • Embargoed (until 23/07/21)


Eleonora Calì, Gwilherm Kerherve, Faris Naufal, Kalliopi Kousi, Dragos Neagu, Evangelos I. Papaioannou, Melonie P. Thomas, Beth S. Guiton, Ian S. Metcalfe, John T.S. Irvine, David J. Payne

School/Research organisations


The search for new functional materials that combine high stability and efficiency with reasonable cost and ease of synthesis is critical for their use in renewable energy applications. Specifically in catalysis, nanoparticles, with their high surface-to-volume ratio, can overcome the cost implications associated with otherwise having to use large amounts of noble metals. However, commercialized materials, that is, catalytic nanoparticles deposited on oxide supports, often suffer from loss of activity because of coarsening and carbon deposition during operation. Exsolution has proven to be an interesting strategy to overcome such issues. Here, the controlled emergence, or exsolution, of faceted iridium nanoparticles from a doped SrTiO3 perovskite is reported and their growth preliminary probed by in situ electron microscopy. Upon reduction of SrIr0.005Ti0.995O3, the generated nanoparticles show embedding into the oxide support, therefore preventing agglomeration and subsequent catalyst degradation. The advantages of this approach are the extremely low noble metal amount employed (∼0.5% weight) and the catalytic activity reported during CO oxidation tests, where the performance of the exsolved SrIr0.005Ti0.995O3 is compared to the activity of a commercial catalyst with 1% loading (1% Ir/Al2O3). The high activity obtained with such low doping shows the possibility of scaling up this new catalyst, reducing the high cost associated with iridium-based materials.


Original languageEnglish
Pages (from-to)37444-37453
Number of pages10
JournalACS Applied Materials & Interfaces
Issue number33
Early online date23 Jul 2020
Publication statusPublished - 19 Aug 2020

    Research areas

  • Catalysis, Exsolution, in situ TEM, Iridium, Nanoparticles

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Microwave irradiation synthesis to obtain La0.7-xPrxCa0.3MnO3 perovskites: electrical and electrochemical performance

    Ferrel-Alvarez, A. C., Domínguez-Crespo, M. A., Cong, H., Torres-Huerta, A. M., Palma-Ramírez, D. & Irvine, J. T. S., 31 Aug 2020, In : Journal of Alloys and Compounds. 851, 156882.

    Research output: Contribution to journalArticle

  2. Graphitic-C3N4 coated floating glass beads for photocatalytic destruction of synthetic and natural organic compounds in water under UV light

    Hui, J., Pestana, C. J., Caux, M., Gunaratne, H. Q. N., Edwards, C., Robertson, P. K. J., Lawton, L. A. & Irvine, J. T. S., 28 Sep 2020, In : Journal of Photochemistry and Photobiology A: Chemistry. 405, 112935.

    Research output: Contribution to journalArticle

  3. Activation of anion redox in P3 structure cobalt-doped sodium manganese oxide via introduction of transition metal vacancies

    Kim, E. J., Mofredj, K., Pickup, D., Chadwick, A., Irvine, J. T. S. & Armstrong, R., 20 Oct 2020, In : Journal of Power Sources. 481, 229010.

    Research output: Contribution to journalArticle

  4. Photocatalytic removal of the cyanobacterium Microcystis aeruginosa PCC7813 and four microcystins by TiO2 coated porous glass beads with UV-LED irradiation

    Pestana, C. J., Portela Noronha, J., Hui, J., Edwards, C., Gunaratne, H. Q. N., Irvine, J. T. S., Robertson, P. K. J., Capelo-Neto, J. & Lawton, L. A., 22 Jul 2020, In : Science of the Total Environment. 745, 141154.

    Research output: Contribution to journalArticle

  5. A novel electrode with multifunction and regeneration for highly efficient and stable symmetrical solid oxide cell

    Tian, Y., Liu, Y., Jia, L., Naden, A., Chen, J., Chi, B., Pu, J., Irvine, J. T. S. & Li, J., 16 Aug 2020, In : Journal of Power Sources. 475, 228620.

    Research output: Contribution to journalArticle

Related by journal

  1. A highly efficient coordination polymer for selective trapping and sensing of perrhenate/pertechnetate

    Li, C-P., Zhou, H., Chen, J., Wang, J-J., Du, M. & Zhou, W., 1 Apr 2020, In : ACS Applied Materials & Interfaces. 12, 13, p. 15246-15254

    Research output: Contribution to journalArticle

  2. Tetrapodal diazatriptycene enforces orthogonal orientation in self-assembled monolayers

    Benneckendorf, F. S., Rohnacher, V., Sauter, E., Hillebrandt, S., Muench, M., Wang, C., Casalini, S., Ihrig, K., Beck, S., Jaensch, D., Freudenberg, J., Jaegermann, W., Samori, P., Pucci, A., Bunz, U. H. F., Zharnikov, M. & Muellen, K., 5 Feb 2020, In : ACS Applied Materials & Interfaces. 12, 5, p. 6565-6572 8 p.

    Research output: Contribution to journalArticle

  3. A Luminescent Amine-Functionalized Metal-Organic Framework Conjugated with Folic Acid as a Targeted Biocompatible pH-Responsive Nanocarrier for Apoptosis Induction in Breast Cancer Cells

    Abazari, R., Ataei, F., Morsali, A., Slawin, A. M. Z. & Carpenter-Warren, C. L., 11 Dec 2019, In : ACS Applied Materials & Interfaces. 11, 49, p. 45442-45454 13 p.

    Research output: Contribution to journalArticle

  4. Mechanism–property correlation in coordination polymer crystals toward design of a superior sorbent

    Li, C-P., Zhou, H., Wang, J-J., Liu, B-L., Wang, S., Yang, X., Wang, Z-L., Liu, C-S., Du, M. & Zhou, W., 13 Nov 2019, In : ACS Applied Materials & Interfaces. 11, 45, p. 42375-42384 10 p.

    Research output: Contribution to journalArticle

ID: 269925558