The
effective utilization of visible light is required for exploiting
photocatalytic reactions in indoor and outdoor environments. In this
study, Pd-supported BiVO4 microspheres (Pd–BiVO4) were prepared for visible light-induced photocatalytic reactions.
Under irradiation with a white light-emitting diode, the obtained
Pd–BiVO4 composite exhibited considerably improved
catalytic activity for the decomposition of an organic dye compared
with other BiVO4 catalysts. The Pd–BiVO4 composite was also effective for catalytic organic transformation
via the visible light-induced Suzuki–Miyaura coupling reaction.
The photogenerated electrons in the conduction band of BiVO4 flowed to the Pd nanoparticles and amplified cross-coupling reaction.
The influence of the crystal structure and grain size of BiVO4 and the role of the deposited Pd nanoparticles were fully
investigated to elucidate the visible light activity of the catalyst.
This system highlights the possibility of an indoor light source with
low energy density for sustainable organic transformations.
A BiVO4/Bi2S3 composite comprising Bi2S3 nanowires on top of a BiVO4 film was prepared
via hydrothermal reaction. Because additional Bi3+ ions
were not delivered during the reaction, BiVO4 served as
the Bi3+ ion source for the development of Bi2S3. A detailed growth mechanism of the nanowire was elucidated
by an analysis of the concentration gradient of Bi3+ and
S2– ions during the reaction. The in situ growth was followed by the etching of BiVO4 to Bi3+ and VO4
3– ions and regrowth
to Bi2S3, which resulted in the rapid evolution
of nanowires on the BiVO4 substrate. The fabricated BiVO4/Bi2S3NW composite exhibited an improved
photoelectrochemical activity compared to other Bi2S3 samples. The improved efficiency was mainly attributed to
both improved charge separation and effective adhesion obtained by
the in situ growth.
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