Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 27th March 2019 from 11:00 AM to 1:00 PM (GMT).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Issue 20, 2015
Previous Article Next Article

Visible-light photocatalysis in Cu2Se nanowires with exposed {111} facets and charge separation between (111) and ([1 with combining macron][1 with combining macron][1 with combining macron]) polar surfaces

Author affiliations

Abstract

The search for active narrow band gap semiconductor photocatalysts that directly split water or degrade organic pollutants under solar irradiation remains an open issue. We synthesized Cu2Se nanowires with exposed {111} facets using ethanol and glycerol as morphology controlling agents. The {111} facets were found to be the active facets for decomposing organic contaminants in the entire solar spectrum. Based on the polar structure of the Cu2Se {111} facets, a charge separation model between polar (111) and ([1 with combining macron][1 with combining macron][1 with combining macron]) surfaces is proposed. The internal electric field between polar (111) and ([1 with combining macron][1 with combining macron][1 with combining macron]) surfaces created by spontaneous polarization drives charge separation. The reduction and oxidation reactions occur on the positive (111) and negative ([1 with combining macron][1 with combining macron][1 with combining macron]) polar surfaces, respectively. This suggests the surface-engineering of narrow band gap semiconductors as a strategy to fabricate photocatalysts with high reactivity in the entire solar spectrum. The charge separation model can deepen the understanding of charge transfer in other semiconductor nanocrystals with high photocatalytic activities and offer guidance to design more effective photocatalysts as well as new types of solar cells, photoelectrodes and photoelectric devices.

Graphical abstract: Visible-light photocatalysis in Cu2Se nanowires with exposed {111} facets and charge separation between (111) and ( [[1 with combining macron]]  [[1 with combining macron]]  [[1 with combining macron]] ) polar surfaces

Back to tab navigation

Supplementary files

Publication details

The article was received on 24 Jan 2015, accepted on 14 Apr 2015 and first published on 16 Apr 2015


Article type: Paper
DOI: 10.1039/C5CP00450K
Author version
available:
Download author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 13280-13289

  •   Request permissions

    Visible-light photocatalysis in Cu2Se nanowires with exposed {111} facets and charge separation between (111) and ([1 with combining macron][1 with combining macron][1 with combining macron]) polar surfaces

    B. Liu, L. Ning, H. Zhao, C. Zhang, H. Yang and S. (. Liu, Phys. Chem. Chem. Phys., 2015, 17, 13280
    DOI: 10.1039/C5CP00450K

Search articles by author

Spotlight

Advertisements