Impact of In 2 S 3 shells thickness on the electrochemical and optical properties of oriented ZnO/In 2 S 3 core/shell nanowires

Preparation of polyaniline/PbS core-shell nano/microcomposite and its application for photocatalytic H2 electrogeneration from H2O

“…The increasing in size with aniline concentrations from 0.01 M (composite I) to 0.03 M (composite II) is due to increasing of the nucleation sites that cause more coalescence of the deposited nano/microcomposite 41 . But with further increasing of the aniline concentration to 0.05 M (composite III), the particles sizes decrease due to the reduction of the Vander Waals force interactions that exist between the crystals because of disorder the particles deposition during the formation of core-shell composite 42 .…”

Self-Assembled Vertically Aligned Hetero-Epitaxial ZnO/CdS Core/Shell Array by all CBD Process: Platform for Enhanced Visible-Light-Driven PEC Performance

“…With increased coverage and shell thickness, such absorptions are higher, consistent with the observed increased visible absorption of incident photon flux (Figure ). In addition, the spatial charge separation due to staggered energy band alignment in type-II heterostructure composed of ZnO NRs and CdS QDs may efficiently suppress the radiative recombination of photoinduced carriers and quenching the luminescence from ZnO, which is the dominant contribution to the reduction in NBE peak intensity of ZnO/CdS NRs. ,,, Such a suppression of charge carrier recombination suggests the occurrence of prolonged carriers’ lifetime in ZnO/CdS NRs heterostructure, beneficial for their photoelectrochemical cell (PEC) performance.…”

“…In addition, the spatial charge separation due to staggered energy band alignment in type-II heterostructure composed of ZnO NRs and CdS QDs may efficiently suppress the radiative recombination of photoinduced carriers and quenching the luminescence from ZnO, which is the dominant contribution to the reduction in NBE peak intensity of ZnO/CdS NRs. 13,15,26,45 Such a suppression of charge carrier recombination suggests the occurrence of prolonged carriers' lifetime in ZnO/CdS NRs heterostructure, beneficial for their photoelectrochemical cell (PEC) performance. Furthermore, a weak and broad visible emission band in the wavelength range of 500−750 nm (having two shoulder peaks P1 at ∼570 nm and P2 at ∼630 nm) is observed in measured PL spectra (inset of Figure 8a).…”

“…Photoelectrochemical (PEC) cell water splitting using nanostructured semiconductor materials has been attracting great attention for production of clean and high-efficiency renewable energy. − Broad absorption region, effective charge transfer, and high photostability of semiconductor photoanodes are the prerequisite features for the improved PEC performance. − Vertically aligned one-dimensional (1D) metal oxide semiconductor nanostructure arrays (i.e., nanorods, nanowires, and nanotubes) can act as excellent material nanoarchitectures for various solar energy conversion applications such as solar cells, photocatalysis, and PEC cells. − Core/shell type aligned 1D nanostructure arrays are potentially superior photoelectrodes for generating high photocurrent, owing to their large effective junction area, increased light absorption due to light trapping effect, short diffusion length, ideal geometrical structures for fast electron transport, and less charge recombination probability. , The single crystalline vertically oriented nanorods (core) are the key to a superior electron conduction through the core of the photoanode. Vertically aligned 1D metal oxides, like ZnO or TiO 2 , based photoanodes with earth abundant constituents are emerging as the promising candidates due to their photostable, inexpensive, and environmentally friendly nature.…”

ZnO Nanosheets Decorated with Graphite-Like Carbon Nitride Quantum Dots as Photoanodes in Photoelectrochemical Water Splitting

“…To overcome this limitation, different attempts have been undertaken such as (1) modulation of the morphology, which facilitates high light absorbance and the separation of photogenerated charge carriers, (2) elemental doping, which helps to tune the band gap of ZnO, (3) development of an efficient heterostructure of ZnO with some other narrow-band-gap semiconductors such as In 2 S 3 , CdS, etc., which helps to increase the spectral absorbance as well as to separate photogenerated electron–hole pairs, (4) sensitization with plasmonic nanoparticles to increase the optical absorbance. − What is important is that semiconductor-based heterostructure formation has drawn tremendous attention in PEC water splitting recently by improving the light absorbance, and depending on the band alignment, it helps to increase the charge-carrier lifetime through proper separation. There are few reports on such heterostructure development for PEC water splitting.…”