Volume 3 Issue 1
March  2024
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Jonathan Ruiz Esquius, Alec P LaGrow, Haiyan Jin, Zhipeng Yu, Ana Araujo, Rita Marques, Adélio 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, Adélio 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
  • Publish Date: 2024-01-04
  • 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 µgIr−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 µgIr 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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