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Carbon-Dot-Based Heterojunction for Engineering Band-Edge Position and Photocatalytic Performance
作者:Shengliang Hu, Huiqi Wang, et al.
关键字:CDs,Photocatalytic,Heterojunction
论文来源:期刊
具体来源:Small
发表时间:2018年

A photocatalytic reaction is always governed by energy band configuration

of the catalyst, but its modulation is challenging. Here, the adjustment of

band-edge positions of Ag3PO4  through fluorescent carbon dots is reported

for the first time. Both Ag3PO4  and carbon dots which keep the similar sizes

constitute a heterojunction. Such heterostructure not only promotes visible

light absorption, photogenerated charge separation, and transfer, but it also

transforms photocatalytic activity of Ag3PO4  from photooxidation to photo-

reduction due to the huge changes of band-edge positions. In addition, the

heterojunction structure of carbon dots and Ag3PO4  exhibits unique temper-

ature-responsive photocatalytic activities and higher photocatalytic stability

than the pure Ag3PO4 . According to the contrast experiments and related

characterizations, the possible mechanism of photocatalytic reaction is

proposed. Therefore, this work offers an alternative route for adjusting energy

band positions or tuning photocatalytic performance as well as for preparing

novel carbon-dot-based heterostructure.