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Selective CO2 reduction into formate using Ln-Ta oxynitrides combined with a binuclear Ru(II) complex under visible light

Abstract : Hybrid materials constructed from a visible-light-absorbing semiconductor and a functional metal complex have attracted attention as efficient photocatalysts for CO2 reduction with high selectivity to a desired product. In this work, defect fluorite-type Ln-Ta oxynitrides LnTaOxNy (Ln = Nd, Sm, Gd, Tb, Dy and Ho) were examined as the semiconductor component in a hybrid photocatalyst system combined with known Ag nanoparticle promoter and binuclear ruthenium(II) complex (RuRu'). Among the LnTaOxNy examined, TbTaOxNy gave the highest performance for CO2 reduction under visible light (λ > 400 nm), with a RuRu'-based turnover number of 18 and high selectivity to formate (>99%). Physicochemical analyses indicated that high crystallinity and more negative conduction band potential of LnTaOxNy with the absence of Ln-4f states in the band gap structure contributed to higher activity of the hybrid photocatalyst.
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Submitted on : Thursday, July 9, 2020 - 3:57:52 PM
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Kanemichi Muraoka, Miharu Eguchi, Osamu Ishitani, François Cheviré, Kazuhiko Maeda. Selective CO2 reduction into formate using Ln-Ta oxynitrides combined with a binuclear Ru(II) complex under visible light. Journal of Energy Chemistry, Elsevier, 2021, 55, pp.176-182. ⟨10.1016/j.jechem.2020.06.064⟩. ⟨hal-02895318⟩

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