Hydrogen Production from Water Splitting Using Photo-Semiconductor Catalysts

A Heterojunction Design of Single Layer Hole Tunneling ZnO Passivation Wrapping around TiO2Nanowires for Superior Photocatalytic Performance

“…Among all nano-architectures, the most typical ones that offer high surface area are nanoparticles, nanotubes and nanowires. Although among all of them nanoparticles offer the highest surface area, nanotubes and nanowires show higher PCA mainly due to better charge separation and photocurrent response 64 . It was demonstrated that photoconversion efficiency of TiO 2 nanowires is higher than that of spherical nanoparticles 65 66 .…”

From Nanorods to Nanowires of CdS Synthesized by a Solvothermal Method: Influence of the Morphology on the Photoactivity for Hydrogen Evolution from Water

“…The changes in the photocatalytic activity of CdS samples (Figure 8) should be a consequence of their changes in the crystallinity, morphology and size because these parameters affect the generation, separation and migration of the photogenerated charge carriers (e − /h + ) responsible for photoactivity [4,37,38]. With respect to photophysical characteristics of CdS samples, their UV-Vis absorption spectra (Figure 7) showed that the position of absorption edges and the band gap values of all samples (Table 1) were quite similar as a consequence of their similar composition and structure, which are the main factors that determine the band gap of the CdS photocatalyst.…”

“…The conversion of solar energy into hydrogen via the water splitting process assisted by photosemiconductors is one of the most interesting ways to achieve a clean and renewable energy system [1,2]. Cadmium sulfide (CdS) nanostructures have been widely applied for solar driven H 2 production due to its suitable band gap (2.4 eV) and band gap energy [3,4,5,6,7,8,9,10,11]. The photoactivity of CdS nanostructures depends on their crystalline phase, structure, morphology, defects and size.…”

“…The photoactivity of CdS nanostructures depends on their crystalline phase, structure, morphology, defects and size. In the nano regime, the photoactivity of CdS was improved in samples with wurtzite structure, good crystallinity and short bulk-to-surface diffusion distance for photogenerated electrons and holes [4]. Taking into account the effects of these factors on the photoactivity of CdS nanostructures, much effort has been made to control the synthesis of CdS at the nanometric scale [4,9,12].…”

“…In the nano regime, the photoactivity of CdS was improved in samples with wurtzite structure, good crystallinity and short bulk-to-surface diffusion distance for photogenerated electrons and holes [4]. Taking into account the effects of these factors on the photoactivity of CdS nanostructures, much effort has been made to control the synthesis of CdS at the nanometric scale [4,9,12]. In particular, zero-dimensional (0D) quantum dots and one-dimensional (1D) CdS nanostructures such as nanorods, nanowires and nanoribbons have received considerable attention in the last years due to their potential to enhance photoactivity with respect to bulk CdS [13,14,15,16].…”