Visible-Light-Responsive CuLi1/3Ti2/3O2 Powders Prepared by a Molten CuCl Treatment of Li2TiO3 for Photocatalytic H2 Evolution and Z-Schematic Water Splitting

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• 作者：Katsuya Iwashina ; Akihide Iwase ; Shunsuke Nozawa ; Shin-ichi Adachi ; Akihiko Kudo
• 刊名：Chemistry of Materials
• 出版年：2016
• 出版时间：July 12, 2016
• 年：2016
• 卷：28
• 期：13
• 页码：4677-4685
• 全文大小：563K
• 年卷期：0
• ISSN：1520-5002

文摘

CuLi_1/3Ti_2/3O₂ powders with hexagonal- and trigonal-delafossite structures were prepared by treating cubic-Li₂TiO₃ and monoclinic-Li₂TiO₃ with molten CuCl, respectively. It was confirmed that Li⁺ at the interlayer of Li₂TiO₃ was replaced with Cu(I). Both hexagonal- and trigonal-CuLi_1/3Ti_2/3O₂ showed photocatalytic activities for sacrificial H₂ evolution using visible light up to 600 nm which corresponds to their absorption edges (BG 2.1 eV), when Ru- and Pt-cocatalysts were loaded. The activity of the hexagonal-CuLi_1/3Ti_2/3O₂ was higher than that of the trigonal-CuLi_1/3Ti_2/3O₂. The apparent quantum yield of the sacrificial H₂ evolution from an aqueous K₂SO₃ + Na₂S solution over the hexagonal-CuLi_1/3Ti_2/3O₂ loaded with Ru-cocatalyst was 3.3% at 420 nm. Moreover, Z-schematic water splitting was achieved when hexagonal- and trigonal-CuLi_1/3Ti_2/3O₂ with a Pt-cocatalyst as H₂-evolving photocatalysts were combined with a reduced graphene oxide (RGO)-TiO₂ composite as an O₂-evolving photocatalyst.