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Modulating the photoelectrons of g-C3N4 via coupling MgTi2O5 as appropriate platform for visible-light-driven photocatalytic solar energy conversion
Ist Teil von
Nano research, 2019-08, Vol.12 (8), p.1931-1936
Ort / Verlag
Beijing: Tsinghua University Press
Erscheinungsjahr
2019
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
Graphitic carbon nitride (g-C
3
N
4
) has become an attractive visible-light-responsive photocatalyst because of its semiconductor polymer compositions and easy-modulated band structure. However, the bulk g-C
3
N
4
photocatalyst has the low separation efficiency of photogenerated carriers and unsatisfied surface catalytic performance, which leads to poor photocatalytic performance. As for this, MgTi
2
O
5
with high chemical stability, wide band gap and negative conduction band was used as a suitable platform for coupling with g-C
3
N
4
to enhance charge separation and promoted the photoactivity. Different from common approaches, here, we propose an innovative method to construct g-C
3
N
4
/MgTi
2
O
5
nanocomposites featuring “0 + 1 > 1” magnification effect to improve g-C
3
N
4
photocatalytic performance under visible light irradiation. Additionally, compositing metal oxides of MgTi
2
O
5
with g-C
3
N
4
has proven to be a proper strategy to accelerate surface catalytic reactions in g-C
3
N
4
, and the photoinduced carriers were modulated to maintain thermodynamic equilibrium, which convincingly promotes the photocatalytic activity. The photocatalytic performance of the nanocomposites was measured by hydrogen production and CO
2
reduction under visible light. The developed g-C
3
N
4
/MgTi
2
O
5
nanocomposites with a 5 wt.% MgTi
2
O
5
exhibits the highest H
2
and CO yield under visible light and excellent stability compare to the other MgTi
2
O
5
contents in composites. According to surface photo-voltage spectra, electrochemical CO
2
reduction, photoluminescence, etc. The superior performance can be related to an enhanced electron lifetime, the promoted charge transfer and the increased electronic separation property of g-C
3
N
4
. Our work provides an approach to overcome the defect of pure g-C
3
N
4
, which accesses to composite with the second component matched well.