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Enhanced photocatalytic efficiency of C3N4/BiFeO3 heterojunctions: synergistical effects of band alignment and ferroelectricity

Abstract

As one of the most promising photocatalysts, graphitic carbon nitride (g-C3N4) shows visible light response and great chemical stability. However, its relative low photocatalytic efficiency is a main obstacle to actual applications. Here an effective and feasible method to dramatically increase the visible light photocatalytic efficiency by forming C3N4/BiFeO3 ferroelectric heterojunction is reported, wherein the band alignment and piezo-/ferroelectricity have synergistically positive effects to accelerate the separation of photogenerated carriers. At the optimum composition of 10wt.% BiFeO3, the heterojunction shows 1.4 times improved photocatalytic efficiency than that of pure C3N4. Most importantly, mechanically pressing and electrically poling can also improve the photocatalytic efficiency by 1.3 times and 1.8 times, respectively. The optimized photocatalytic efficiency is even comparable with some noble metal based compounds. These results not only prove the improved photocatalytic activity of C3N4-ferroelectrics heterojunction, but also provide a new approach to design high-performance photocatalyst by taking advantage of ferroelectricity.

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Publication details

The article was received on 13 Sep 2017, accepted on 02 Jan 2018 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP06274E
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Enhanced photocatalytic efficiency of C3N4/BiFeO3 heterojunctions: synergistical effects of band alignment and ferroelectricity

    X. Deng, C. Song, Y. Tong, G. yuan, F. Gao, D. Liu and S. Zhang, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP06274E

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