Oxygen-deficient photostable Cu2O for enhanced visible light photocatalytic activity

Date

2018

Authors

Bhargava, Suresh Kumar
Bansal, Vipul
Singh, Mandeep
Jampaiah, Deshetti
Kandjani, Ahmad E
Sabri, Ylias M
Della Gaspera, Enrico
Reineck, Philipp
Cox, Nicholas
van Embden, Joel

Journal Title

Journal ISSN

Volume Title

Publisher

Royal Society of Chemistry

Abstract

Oxygen vacancies in inorganic semiconductors play an important role in reducing electron-hole recombination, which may have important implications in photocatalysis. Cuprous oxide (Cu2O), a visible light active p-type semiconductor, is a promising photocatalyst. However, the synthesis of photostable Cu2O enriched with oxygen defects remains a challenge. We report a simple method for the gram-scale synthesis of highly photostable Cu2O nanoparticles by the hydrolysis of a Cu(i)-triethylamine [Cu(i)-TEA] complex at low temperature. The oxygen vacancies in these Cu2O nanoparticles led to a significant increase in the lifetimes of photogenerated charge carriers upon excitation with visible light. This, in combination with a suitable energy band structure, allowed Cu2O nanoparticles to exhibit outstanding photoactivity in visible light through the generation of electron-mediated hydroxyl (OH) radicals. This study highlights the significance of oxygen defects in enhancing the photocatalytic performance of promising semiconductor photocatalysts.

Description

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Citation

Source

Nanoscale

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

CC BY-NC

DOI

10.1039/c7nr08388b

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