Jump to main content
Jump to site search


The role of a metallic copper interlayer during visible photocatalytic hydrogen generation over a Cu/Cu2O/Cu/TiO2 catalyst

Author affiliations

Abstract

The role of metallic copper as a co-catalyst is still uncertain, which is an interesting problem in photocatalytic hydrogen evolution. There is debate over the role of Cu+, Cu2+ and metallic Cu during photocatalytic hydrogen generation. Herein, we identified that the metallic copper interlayer between Cu2O and TiO2 played a key role in the hydrogen evolution process. By fabricating the metallic Cu interlayer via in situ reduction of Cu2O/TiO2, efficient charge transfer took place over the Cu/Cu2O/Cu/TiO2 catalyst, while a retarded electron transfer was found over the Cu/TiO2 catalyst. This interlayer structure provides a bridge for photoelectron transfer from th`e conduction band of TiO2 to Cu2O, significantly prolonging the life-time of electron transfer. In addition, the ratio of metallic Cu and Cu2O could be easily adjusted by the loading amount of Cu2O on TiO2, and that the ratio affects the photocatalytic hydrogen evolution activity. A high transient photocurrent and long fluorescence lifetime (0.365 ns) were achieved over the Cu/Cu2O/Cu/TiO2 catalyst when the molar ratio of the interlayer metallic Cu to Cu2O was 0.99. Under the same reaction conditions, the photocatalytic hydrogen generation activity of the Cu/Cu2O/Cu/TiO2 catalyst was three times than that observed with the Cu/TiO2 catalyst with good stability.

Graphical abstract: The role of a metallic copper interlayer during visible photocatalytic hydrogen generation over a Cu/Cu2O/Cu/TiO2 catalyst

Back to tab navigation

Publication details

The article was received on 17 Jul 2017, accepted on 01 Oct 2017 and first published on 02 Oct 2017


Article type: Paper
DOI: 10.1039/C7CY01432E
Citation: Catal. Sci. Technol., 2017, Advance Article
  •   Request permissions

    The role of a metallic copper interlayer during visible photocatalytic hydrogen generation over a Cu/Cu2O/Cu/TiO2 catalyst

    W. Zhen, W. Jiao, Y. Wu, H. Jing and G. Lu, Catal. Sci. Technol., 2017, Advance Article , DOI: 10.1039/C7CY01432E

Search articles by author

Spotlight

Advertisements