In the present work, we reported the exploration of photoanodes based on mesoporous WO3 nanobelts through a foaming‐assisted electrospinning strategy. The introduced polyvinylpyrrolidone in the raw solutions played a determining role on the formation of the nanobelts, enabling their fabrication in a controlled manner. The as‐fabricated mesoporous WO3 nanobelts exhibited a photocurrent density of 311 μA cm−2 and incident photon‐to‐current efficiency of 6.5 % at 350 nm and 1.2 V vs. Ag/AgCl under simulated sunlight illumination, which are 2.3 times to that of cylindrical nanofibers. Furthermore, our discovery confirmed that, in comparison to the conventionally cylindrical nanofibers, the nanobelts with a rectangular cross section could be a better candidate for constructing photoanodes with enhanced photoelectrochemical efficiency and stability.
Hexagonal phase NaYF4:Yb3+,Er3+ nanoclusters were prepared using a facile solvothermal method. The structures and morphologies of the products were investigated using an X-ray powder diffractometer and a transmission electron microscope. Modified by the capping agent of poly(acrylic acid), the as-prepared NaYF4 NCs show excellent water solubility. Under 980-nm excitation, the aqueous solution of the sample displayed a bright green upconversion (UC) fluorescence. The luminescence dynamics were further studied based on the UC excitation pathways and the emission processes. Such water soluble UC samples may find application in the field of biological imaging.
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