Carbon-Dot-Based Heterojunction for Engineering Band-Edge Position and Photocatalytic Performance
writer：Shengliang Hu, Huiqi Wang, et al.
keywords：CDs，Photocatalytic，Heterojunction
source：期刊
specific source：Small
Issue time：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.