Skip to content

Research at St Andrews

Step-change in high temperature steam electrolysis performance of perovskite oxide cathodes with exsolution of B-site dopants

Research output: Contribution to journalArticle



George Tsekouras, Dragos Neagu, John T. S. Irvine

School/Research organisations


B-site doped, A-site deficient perovskite oxide titanates with formula La0.4Sr0.4Mnxn+Ti1-xO3-gamma-delta (M = Fe3+ or Ni2+; x = 0.06; gamma = (4 - n)x/2) were employed as solid oxide electrolysis cell (SOEC) cathodes for hydrogen production via high temperature steam electrolysis at 900 degrees C. A-site deficiency provided additional driving force for the exsolution of a proportion of B-site dopants at the surface in the form of metallic nanoparticles under reducing SOEC cathode operating conditions. In the case of La0.4Sr0.4Fe0.06Ti0.94O2.97, this represents the first time that Fe-0 has been exsolved from a perovskite in such a way. Exsolution was due in part to the inability of the host lattice to accommodate vacancies (introduced (delta) oxygen vacancies (V-o(..)) and fixed A-site (V-Sr('')) and inherent (gamma) oxygen vacancies) beyond a certain limit. The presence of electrocatalytically active Fe-0 or Ni-0 nanoparticles and higher V-o(..) concentrations dramatically lowered the activation barrier to steam electrolysis compared to the parent material (x = 0). The use of defect chemistry to drive the exsolution of less reducible dopant cations could conceivably be extended to produce new catalytically active perovskites with unique properties.



Original languageEnglish
Pages (from-to)256-266
Number of pages11
JournalEnergy & Environmental Science
Issue number1
Publication statusPublished - Jan 2013

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., 25 Nov 2020, In : Science of the Total Environment. 745, 141154.

    Research output: Contribution to journalArticle

  5. Perovskite oxynitride solid solutions of LaTaON2-CaTaO2N with greatly enhanced photogenerated charge separation for solar-driven overall water splitting

    Wang, Y., Kang, Y., Zhu, H., Liu, G., Irvine, J. T. S. & Xu, X., 25 Nov 2020, In : Advanced Science . Early View, 8 p., 2003343.

    Research output: Contribution to journalArticle

Related by journal

  1. Morphology changes upon scaling a high-efficiency, solution-processed solar cell

    Ro, H. W., Downing, J. M., Engmann, S., Herzing, A. A., Delongchamp, D. M., Richter, L. J., Mukherjee, S., Ade, H., Abdelsamie, M., Jagadamma, L. K., Amassian, A., Liu, Y. & Yan, H., 1 Sep 2016, In : Energy and Environmental Science. 9, 9, p. 2835-2846 12 p.

    Research output: Contribution to journalArticle

  2. Role of coal characteristics in the electrochemical behaviour of hybrid direct carbon fuel cells

    Fuente Cuesta, A., Jiang, C., Arenillas, A. & Irvine, J. T. S., 1 Sep 2016, In : Energy & Environmental Science. 9, 9, p. 2868-2880 13 p.

    Research output: Contribution to journalArticle

  3. Structurally stable Mg-doped P2-Na2/3Mn1-yMgyO2 sodium-ion battery cathodes with high rate performance: insights from electrochemical, NMR and diffraction studies

    Clément, R., Billaud, J., Armstrong, R., Singh, G., Rojo, T., Bruce, P. G. & Grey, C. P., 1 Oct 2016, In : Energy & Environmental Science. 9, 10, p. 3240-3251 12 p.

    Research output: Contribution to journalArticle

  4. Na0.67Mn1-xMgxO2 (0 <= x <= 0.2): a high capacity cathode for sodium-ion batteries

    Billaud, J., Singh, G., Armstrong, A. R., Gonzalo, E., Roddatis, V., Armand, M., Rojob, T. & Bruce, P. G., Apr 2014, In : Energy & Environmental Science. 7, 4, p. 1387-1391 5 p.

    Research output: Contribution to journalArticle

ID: 43319164