Ag3PO4/Ag2CO3 p-n heterojunction composites with enhanced photocatalytic activity under visible light

doi:10.1016/S1872-2067(15)61004-X

Abstract

Abstract:

Formation of a p-n heterojunction rather than p-type or n-type semiconductors can enhance the separation of photogenerated electrons and holes and increase the quantum efficiency of photocatalytic reactions owing to the difference of the electric potential in the inner electric field near the junction, pointing from n toward p. n-Ag₃PO₄/p-Ag₂CO₃ p-n heterojunction composites are prepared through a facile coprecipitation process. The obtained Ag₃PO₄/Ag₂CO₃ p-n heterojunctions exhibit excellent photocatalytic performance in the removal of rhodamine B (RhB) compared with Ag₃PO₄ and Ag₂CO₃. The 40%-Ag₃PO₄/Ag₂CO₃ composite photocatalyst (40 mol% Ag₃PO₄and 60 mol% Ag₂CO₃) exhibits the best photocatalytic activity under visible light, demonstrating the ability to completely degrade RhB within 15 min. Transient photovoltage characterization and an active species trapping experiment further indicate that the formation of a p-n heterojunction structure can greatly enhance the separation efficiency of photogenerated carriers and produce more free h⁺ active species, which is the predominant contributor for RhB removal.

Key words: Silver phosphate, Silver carbonate, Composite catalyst, p-n heterojunction, Visible light, Transient photovoltage

Wenjun Fa, Ping Wang, Bing Yue, Fengling Yang, Dapeng Li, Zhi Zheng . Ag₃PO₄/Ag₂CO₃ p-n heterojunction composites with enhanced photocatalytic activity under visible light[J]. Chinese Journal of Catalysis, 2015, 36(12): 2186-2193.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61004-X

https://www.cjcatal.com/EN/Y2015/V36/I12/2186

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Ag₃PO₄/Ag₂CO₃ p-n heterojunction composites with enhanced photocatalytic activity under visible light

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