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Controlled Growth of BiOCl with Large {010} Facets for Dye Self-Photosensitization Photocatalytic Fuel Cells Application
journal contribution
posted on 2017-04-19, 00:00 authored by Lei Zhang, Cheng-Gang Niu, Geng-Xin Xie, Xiao-Ju Wen, Xue-Gang Zhang, Guang-Ming ZengBiOCl
with {010} facets could be a promising material for photodegradation
and energy conversion devices such as dye self-photosensitization
photocatalytic fuel cells (DSPFCs). However, the {010} facets usually
diminish rapidly during the growth process as the result of its high
surface energies. In this work, we reported a simple and efficient
method to prepare BiOCl with tunable exposed {010} facets. It was
found that the solvent used in the synthesis process had important
roles in the formation of ultrathin construction and the growth of
{010} facets by controlling the [H+]. For decreasing the
surface energy and promoting the growth of high-active {010} facets,
the thickness of BiOCl and the areas of {001} were reduced in its
forming process. We had demonstrated that the enhancement of visible
light-harvesting and photosensitization activity of BiOCl was primarily
attributed to the decrease of thickness and the growth of {010} facets
which could provide large surface areas and more active sites for
dye absorption and photoelectron transfer. The BiOCl samples with
tunable exposed {010} areas were evaluated as photoanode materials
in DSPFCs. As expected, owing to its strong dye absorption capability
and high transfer efficiency of charge carriers, the DSPFC with optimal
performance was obtained by employing RhB as fuel when BiOCl possessed
the larger areas of {010} facets and became a thinner nanosheet structure.
Also, the Jsc and Voc of DSPFC were measured to be 0.0058 mA/cm2 and
0.689 V, respectively. Meanwhile, approximately 67% color removal
was achieved on BiOCl{010}-Pt cell by treating 40 mL of 5 mg/L RhB
under visible light for 240 min, which was much higher than that of
P25-Pt (4%).
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photoanode materialsBiOCl samplessurface areassynthesis processphotoelectron transfercharge carriers240 mindye absorptionnanosheet structureultrathin construction0.689 Venergy conversion devicesDSPFCtransfer efficiencyfacet40 mLgrowth processdye absorption capabilityV ocControlled Growthphotosensitization activitysurface energyJ scdye self-photosensitization photocatalytic fuel cellssurface energiesDye Self-Photosensitization Photocatalytic Fuel Cells Application BiOCl
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