Photocatalytic hydrogen production using TiO2–Pt aerogels

Comparative study of alcohols as sacrificial agents in H2 production by heterogeneous photocatalysis using Pt/TiO2 catalysts

“…At higher concentrations, where the predominant mechanism was direct oxidation, methanol gave the better results as it is the better hole scavenger. The largest hydrogen production attained of 1134.08 µmol⋅h -1 or 15.12 mmol⋅h -1 ⋅g -1 is one of the highest one reported in recent studies [4,31,39]. In addition, the kinetics for aqueous methanol solutions with mole fraction < 0.69 adequately fit the L-H model.…”

“…In brief, SG750 is a 73% anatase catalyst with a small surface area (15.2 m 2 ·g -1 ), as is clear from the large particle size in the image in Figure 1. As reported in [35], 55% of the Pt particles of this catalyst are between 2.01-3.00 nm in size and more than 90% are below 5 nm, which would appear to favor a higher level of activity [39]. The presence of Pt particles modifies the catalyst surface, slightly increasing its size and decreasing pore volume.…”

“…In continuous flow systems, in which a carrier gas passes continuously through the reactor during the hydrogen production process, a three-stage pattern is commonly observed in the production of hydrogen over time: [39] (i) an initial period during which the rate of hydrogen production gradually increases, (ii) a maximum period of production in which hydrogen production remains more or less stable or increases at a slower rate, and (iii) a final stage in which the fall in hydrogen production corresponds either to exhaustion of the sacrificial agent or deactivation of the catalyst.…”

Large-mesopore hierarchical tungsten trioxide hydrate with exposed high energy facets: Facile synthesis and enhanced photocatalysis

“…As is well known, surface atomic arrangement and coordination intrinsically determine the adsorption, surface transfer, and desorption; therefore, exposed facets, surface morphology, structure, and particle size have been manipulated extensively for various semiconductor photocatalysts in the literature [20][21][22][23][24][25][26]. Although different dimensional nanostructures of WO 3 have been prepared [27][28][29][30][31][32], three-dimensional layered structure is desirable when applied to photocatalysis, for it might provide much more reactive sites.…”

Fabrication of UCNPs/TiO2 aerogel photocatalyst to improve photocatalytic performance

“…The low-usage of solar irradiation restrains the efficiency of photocatalytic application. As an appropriate way to extend the absorption spectrum of TiO 2 from UV region to Visible and NIR region, several strategies, such as introduction of noble metals [2][3] and cationic substitutions [4][5] in TiO 2 , and combination with upconversion nanoparticles (UCNPs) have been studied [6][7][8], and then the absorption spectrum of TiO 2 could be expanded to visible region even NIR region; however, the efficiency of photocatalytic performance could not meet the requirement because of recombination of photogenerated electrons and holes. Thus, TiO 2 aerogel is introduced to enhance the contact surface between catalysts and reactants in the present study.…”