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Photo-electrochemical activity and selectivity of nanocrystalline BaTiO3 electrodes in water oxidation

  1. 1.
    0533063 - ÚFCH JH 2022 RIV DE eng J - Článek v odborném periodiku
    Klusáčková, Monika - Nebel, Roman - Krtil, Petr - Krýsová, Hana - Pittkowski, Rebecca - Minhová Macounová, Kateřina
    Photo-electrochemical activity and selectivity of nanocrystalline BaTiO3 electrodes in water oxidation.
    Electrochemical Science Advances. Roč. 1, č. 2 (2021), č. článku e2000005. ISSN 2698-5977
    Grant CEP: GA ČR(CZ) GA17-12800S; GA MŠMT(CZ) LM2018124; GA MŠMT(CZ) EF16_013/0001821
    GRANT EU: European Commission(XE) 722614 - ELCOREL
    Grant ostatní: GA MŠk(CZ) CZ.02.1.01/0.0/0.0/16_013/0001821; Akademie věd - GA AV ČR(CZ) L200402001
    Institucionální podpora: RVO:61388955
    Klíčová slova: barium titanate * photo-electrochemistry * water oxidation
    Obor OECD: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
    Způsob publikování: Open access

    Nanocrystalline BaTiO3 photocatalysts were prepared by spray-freeze/freezedrying
    procedure in presence of structure directing gelatin. The synthetic
    approach yields materials with particle sizes ranging between 20 and 60 nm
    conforming to cubic perovskite structure. Regardless of the structural differences,
    the materials show particle size independent bandgap energy of ca.
    3.27 eV. All prepared materials are photo-electrochemically active in water oxidation
    with intrinsic activity decreasing with decreasing particle size. The photoelectrochemical
    activity of BaTiO3 in water oxidation is pH dependent with the
    hole charge transfer processes being significantly suppressed in alkaline media.
    Such a behavior can be ascribed to deprotonation of surface OH groups encountered
    in alkaline media that promotes surface state catalyzed electron transfer
    reactions at the illuminated BaTiO3 surface. The barium titanate shows the ability
    to oxidize water with formation of oxygen and ozone. The ozone formation is
    pronounced on large nanocrystals particularly in acid media. No ozone formation
    was observed in alkaline solutions.
    Trvalý link: http://hdl.handle.net/11104/0311558

     
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