Single-site cocatalysts engineered on supports offer a cost-efficient pathway to utilize precious metals, yet improving the performance further with minimal catalyst loading is still highly desirable. Here we have conducted a photochemical reaction to stabilize ultralow Pt co-catalysts (0.26 wt%) onto the basal plane of hexagonal ZnIn2S4 nanosheets (PtSS-ZIS) to form a Pt-S3 protrusion tetrahedron coordination structure. Compared with the traditional defect-trapped Pt single-site counterparts, the protruding Pt single-sites on h-ZIS photocatalyst enhance the H2 evolution yield rate by a factor of 2.2, which could reach 17.5 mmol g−1 h−1 under visible light irradiation. Importantly, through simple drop-casting, a thin PtSS-ZIS film is prepared, and large amount of observable H2 bubbles are generated, providing great potential for practical solar-light-driven H2 production. The protruding single Pt atoms in PtSS-ZIS could inhibit the recombination of electron-hole pairs and cause a tip effect to optimize the adsorption/desorption behavior of H through effective proton mass transfer, which synergistically promote reaction thermodynamics and kinetics.
in Wiley Online Library (wileyonlinelibrary.com).An nc-TiO 2 /SnO 2 inverse opal composite membrane was fabricated, the photo-activity of which was significantly enhanced by utilizing both slow photons and stop-band reflection of the photonic crystal layer. The materials of the photonic crystal layer must be transparent in the area of adsorption edge of the nc-TiO 2 , so that SnO 2 , having much greater electronic band gap than TiO 2 , was used for the materials of the photonic crystal layer. The photonic band-gap of the SnO 2 photonic crystal was designed at the semiconductor band gap of TiO 2 to harvest slow photons in the interface between the SnO 2 layer and the TiO 2 layer. The two layer structure makes it possible to couple the stop-band reflectivity of the photonic layer to the photocatalyst. Composite membranes can improve solar energy harvesting and substantially improve photocatalysts for photolysis and photochemical degradation of environmental pollutants. V V C 2011 American Institute of Chemical Engineers AIChE J, 58: [568][569][570][571][572] 2012
We always pursue improved energetic performances such as high formation enthalpies, moderate sensitivities and stabilities for all energetic compounds. 1,3,5‐trinitroperhydro‐1,3,5‐triazine (RDX) is a very classic high‐energy explosive which has been applied in both military and civilian fields broadly, whose combustion properties can be enhanced by introducing hydrogen‐storage compounds such as Lithium amidoborane (LAB). Here we apply CPMD method to study how LAB affects a traditional nitramine explosive (RDX) in a simulated detonation. The theoretical results show there are abundant exothermic reactions caused by the introduction of LAB, which suggests hydrogen‐storage material is a prospective assistant ingredient for composite explosives.
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