Enhanced photocatalytic efficiency of C3N4/BiFeO3 heterojunctions: the synergistic effects of band alignment and ferroelectricity†,Physical Chemistry Chemical Physics

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Enhanced photocatalytic efficiency of C3N4/BiFeO3 heterojunctions: the synergistic effects of band alignment and ferroelectricity†
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2018-01-02 00:00:00 , DOI: 10.1039/c7cp06274e
Xian-Zhu Deng _{1,

2,

3,

4,

5} , Chuang Song _{1,

2,

3,

4,

5} , Yin-Lin Tong _{1,

2,

3,

4,

5} , Guoliang Yuan _{6,

7,

8,

9} , Feng Gao _{1,

2,

3,

4,

5} , Dan-Qing Liu _{5,

10,

11,

12} , Shan-Tao Zhang _{1,

2,

3,

4,

5}

Affiliation

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

中文翻译：

C ₃ N ₄ / BiFeO ₃异质结的增强的光催化效率：能带排列和铁电的协同效应†

作为最有前途的光催化剂之一，石墨氮化碳（gC ₃ N ₄）显示出可见光响应和良好的化学稳定性。但是，其相对较低的光催化效率是实际应用的主要障碍。本文报道了通过形成C ₃ N ₄ / BiFeO ₃铁电异质结来显着提高可见光光催化效率的有效可行的方法，其中能带排列和压电/铁电在加速光生载流子分离方面具有协同的积极作用。在10 wt％BiFeO ₃的最佳组成下，异质结显示出的光催化效率是纯C ₃ N _4的1.4倍。最重要的是，机械压制和电极化也可以分别将光催化效率提高1.3倍和1.8倍。优化的光催化效率甚至可以与某些基于贵金属的化合物相媲美。这些结果不仅证明了C ₃ N _4-铁电异质结的提高的光催化活性，而且为利用铁电设计高性能光催化剂提供了一种新方法。

更新日期：2018-01-02

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