Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 44, Pages 19654-19658Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202006756
Keywords
active sites; electrocatalysis; iridium; oxygen evolution reaction; porous materials
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Funding
- National Key R&D Program of China [2017YFA0207800]
- National Natural Science Foundation of China (NSFC) [21771079, 21922507]
- Fok Ying Tung Education Foundation [161011]
- NSFC [21901083, 21621001]
- 111 Project [B17020]
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Reducing the amount of iridium in oxygen evolution electrocatalysts without compromising their catalytic performances is one of the major requirements in proton-exchange-membrane water electrolyzers. Herein, with the help of theoretical studies, we show that anatase-type TiO2-IrO(2)solid solutions possess more active iridium catalytic sites for the oxygen evolution reaction (OER) than IrO2, the benchmark OER catalyst. Note that the same is not observed for their rutile-type counterparts. However, owing to their thermodynamic metastability, anatase-type TiO2-IrO(2)solid solutions are generally hard to synthesize. Our theoretical studies demonstrate that such catalytically active anatase-type solid-solution phases can be created in situ on the surfaces of readily available SrTiO3-SrIrO(3)solid solutions during electrocatalysis in acidic solution as the solution can etch away Sr atoms. We experimentally show this with porous SrTiO3-SrIrO(3)solid-solution nanotubes synthesized by a facile synthetic route that contain 56 % less iridium than IrO(2)yet show an order of magnitude higher apparent catalytic activity for OER in acidic solution.
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