Volume 3 Issue 1
March  2024
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Jonathan Ruiz Esquius, Alec P LaGrow, Haiyan Jin, Zhipeng Yu, Ana Araujo, Rita Marques, Adlio Mendes, Lifeng Liu. Mixed iridium-nickel oxides supported on antimony-doped tin oxide as highly efficient and stable acidic oxygen evolution catalysts[J]. Materials Futures, 2024, 3(1): 015102. doi: 10.1088/2752-5724/ad16d2
Citation: Jonathan Ruiz Esquius, Alec P LaGrow, Haiyan Jin, Zhipeng Yu, Ana Araujo, Rita Marques, Adlio Mendes, Lifeng Liu. Mixed iridium-nickel oxides supported on antimony-doped tin oxide as highly efficient and stable acidic oxygen evolution catalysts[J]. Materials Futures, 2024, 3(1): 015102. doi: 10.1088/2752-5724/ad16d2
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Mixed iridium-nickel oxides supported on antimony-doped tin oxide as highly efficient and stable acidic oxygen evolution catalysts

© 2024 The Author(s). Published by IOP Publishing Ltd on behalf of the Songshan Lake Materials Laboratory
Materials Futures, Volume 3, Number 1
  • Received Date: 2023-11-01
  • Accepted Date: 2023-12-18
  • Rev Recd Date: 2023-12-12
  • Publish Date: 2024-01-04
doi: 10.1088/2752-5724/ad16d2
  • 1.

    Clean Energy Cluster, International Iberian Nanotechnology Laboratory, Av. Mestre Jos Veiga, Braga 4715-330, Portugal

  • 2.

    Carbon Science and Technology Institute, INCAR-CSIC, Francisco Pintado Fe 26, Oviedo 33011, Spain

  • 3.

    Scientific Imaging Section, Okinawa Institute of Science and Technology Graduate University, Kunigami-gun, Okinawa 904-0412, Japan

  • 4.

    Songshan Lake Materials Laboratory, Dongguan 523808, People’s Republic of China

  • 5.

    Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, Porto 4200-465, Portugal

  • 6.

    Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr Roberto Frias, Porto 4200-465, Portugal

  • Author’s contribution

    J R E was responsible for project management, catalyst synthesis, characterisation, testing and manuscript writing. A P L performed STEM characterisation. H J, Z P Y and A A contributed equally and helped in acquiring the XAS data, and they also ensured the smooth operation of the electrochemical test station, and the laboratory in general including the maintenance of working, counter and reference electrodes. R M and A M were responsible of MEA preparation and testing. L L proposed the concept, secured funding, supervised the research, and wrote the final version of the manuscript.

    Author to whom any correspondence should be addressed.

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    Abstract
  • Proton exchange membrane (PEM) water electrolysis represents a promising technology for green hydrogen production, but its widespread deployment is greatly hindered by the indispensable usage of platinum group metal catalysts, especially iridium (Ir) based materials for the energy-demanding oxygen evolution reaction (OER). Herein, we report a new sequential precipitation approach to the synthesis of mixed Ir-nickel (Ni) oxy-hydroxide supported on antimony-doped tin oxide (ATO) nanoparticles (IrNiyOx/ATO, 20 wt.% (Ir + Ni), y = 0, 1, 2, and 3), aiming to reduce the utilisation of scarce and precious Ir while maintaining its good acidic OER performance. When tested in strongly acidic electrolyte (0.1 M HClO4), the optimised IrNi1Ox/ATO shows a mass activity of 1.0 mA gIr-1 and a large turnover frequency of 123 s-1 at an overpotential of 350 mV, as well as a comparatively small Tafel slope of 50 mV dec-1, better than the IrOx/ATO control, particularly with a markedly reduced Ir loading of only 19.7 gIr cm-2. Importantly, IrNi1Ox/ATO also exhibits substantially better catalytic stability than other reference catalysts, able to continuously catalyse acidic OER at 10 mA cm-2 for 15 h without obvious degradation. Our in-situ synchrotron-based x-ray absorption spectroscopy confirmed that the Ir3+/Ir4+ species are the active sites for the acidic OER. Furthermore, the performance of IrNi1Ox/ATO was also preliminarily evaluated in a membrane electrode assembly, which shows better activity and stability than other reference catalysts. The IrNi1Ox/ATO reported in this work is a promising alternative to commercial IrO2 based catalysts for PEM electrolysis.
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