Effective light scattering and charge separation in nanodiamond@g-C3N4 for enhanced visible-light hydrogen evolution
Effective light scattering and charge separation in nanodiamond@g-C3N4 for enhanced visible-light hydrogen evolution
复制标题
nanodiamond@g-C3N4 中的有效光散射和电荷分离可增强可见光析氢
DOI：
10.1016/j.carbon.2018.06.048
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发表时间：
2018-11
期刊：
影响因子：
10.9
通讯作者：
Chong-Xin Shan
中科院分区：
文献类型：
--
作者：
Li-Xia Su;Qun-Zeng Huan;Qing Lou;Zhi-Yu Liu;Jun-Lu Sun;Zong-Tao Zhang;Shi-Rong Qin;Xing Li;Jin-Hao Zang;Lin Dong;Chong-Xin Shan
开发能促进半导体材料电荷分离的异质结构光催化剂是实现高效光催化析氢的关键。本文采用简单的一步热解方法合成了纳米金刚石（ND）@石墨氮化碳（g-C3N4）纳米片异质结构。与原始g-C3N4相比，ND@g-C3N4heterostructures对水裂解析氢的光催化活性增强。负载ND含量为10 wt%的最优异质结构在可见光下表现出最好的光催化析氢性能，比原始g-C3N4高出5.6倍以上。结合实验结果和时域有限差分模拟表明，NDs散射引起的光捕获增加促进了更多局域载流子的产生。同时，由于能级匹配，在ND@g-C3N4interface处的有效电荷分离可以协同诱导g-C3N4的光催化活性增强。
Development of heterostructured photocatalysts that promotes charge separation of semiconductor materials is crucial towards efficient photocatalytic hydrogen evolution. Here nanodiamond (ND)@graphitic carbon nitride (g-C3N4) nanosheet heterostructures were synthesized via a facile one-step pyrolysis approach. The ND@g-C3N4heterostructures exhibit enhanced photocatalytic activity for hydrogen evolution from water splitting as compared with pristine g-C3N4. The optimal heterostructures with 10 wt% ND loading content show the best performance in photocatalytic H2evolution under visible light irradiation, which is more than 5.6 times higher than that of the pristine g-C3N4. The increased light-trapping induced by the scattering of the NDs promotes more localized charge carriers generation, which is clarified by the combined experimental results and finite difference time domain simulations. Meanwhile, the effective charge separation at the ND@g-C3N4interface due to the energy level matching can synergistically induce the enhanced photocatalytic activity of g-C3N4.
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