1 research outputs found
Defect Engineering in CuS<i><sub>x</sub></i>/COF Hybridized Heterostructures: Synergistic Facilitation of the Charge Migration for an Efficacious Photocatalytic Conversion of CO<sub>2</sub> into CO
The photocatalytic CO2 reduction reaction
(CO2RR) provides an attractive approach to tackling environmental
issues.
To actualize the optimal catalytic efficiency, one efficacious strategy
is to rationally modulate the charge migration for the adopted heterogeneous
catalysts. Herein, by virtue of a one-step hydrothermal method, Cu2S nanospheres and defect-rich Cu2S (CuSx) nanosheets are wrapped by a triazine-containing
covalent framework (TP-TA COF), resulting in CuSx/TP-TA and Cu2S/TP-TA. Owing to the heterojunction
construction that suppresses the carrier recombination, both hybridized
structures present enhanced charge migration in comparison to that
of their corresponding sulfides and COF constituents. It is worth
emphasizing that CuSx/TP-TA proffers a
significantly greater photocurrent than Cu2S/TP-TA. The
subsequent photocatalytic reduction of CO2 also exhibits
an apparently higher CO evolution rate, about 2.8 times higher than
the Cu2S/TP-TA photocatalyst. The above evident improvement
owes much to the heterostructure establishment between CuSx and TP-TA COF, as well as the synergistic effect
provided by the defect engineering for CuSx, both of which are able to enhance the separation efficiency of
photoinduced carriers. Our work sheds light on the rational construction
of heterogeneous structures between organic and inorganic photocatalysts,
which emphasizes the possible synergistic effect of defect centers
for enhancing photocatalytic performance