10.1021/am505371g.s001
Jie Zhang
Jie
Zhang
Ping Wang
Ping
Wang
Jian Sun
Jian
Sun
Yongdong Jin
Yongdong
Jin
High-Efficiency Plasmon-Enhanced and Graphene-Supported
Semiconductor/Metal Core–Satellite Hetero-Nanocrystal Photocatalysts
for Visible-Light Dye Photodegradation and H<sub>2</sub> Production
from Water
American Chemical Society
2014
H 2 evolution rate
electron
generation
enhancement
semiconductor
photocatalytic reaction
quantum efficiency
photocatalytic efficiency
H 2 Production
photocatalyst
sample
450 nm
graphene nanosheets
metal nanoparticles
QE
2014-11-26 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/High_Efficiency_Plasmon_Enhanced_and_Graphene_Supported_Semiconductor_Metal_Core_Satellite_Hetero_Nanocrystal_Photocatalysts_for_Visible_Light_Dye_Photodegradation_and_H_sub_2_sub_Production_from_Water/2230897
Solar-driven photocatalytic process
based on electron–hole
pair production in semiconductors is a long sought-after solution
to a green and renewable energy and has attracted a renaissance of
interest recently. The relatively low photocatalytic efficiency, however,
is a main obstacle to their practical applications. A promising attempt
to solve this problem is by combined use of metal nanoparticles, by
taking advantage of strong and localized plasmonic near-field to enhance
solar absorption and to increase the electron–hole pair generation
rate at the surface of semiconductor. Here, we report a semiconductor/metal
visible-light photocatalyst based on CdSe/CdS-Au (QD-Au) core–satellite
heteronanocrystals, and assemble them on graphene nanosheets for better
photocatalytic reaction. The as-synthesized photocatalyst exhibits
excellent plasmon-enhanced photocatalytic activities toward both photodegradation
of organic dye and visible-light H<sub>2</sub> generation from water.
The H<sub>2</sub> evolution rate achieves a maximum of 3113 μmol
h<sup>–1</sup> g<sup>–1</sup> for the heteronanocrystal-graphene
composites, which is about 155% enhancement compared to nonplasmonic
QD-G sample and 340% enhancement compared to control QD-Au-G sample,
and the apparent quantum efficiency (QE) reaches to 25.4% at wavelength
of 450 nm.