Photogeneration, hydrogen

Khader MM, Hannout MM, ElDessouki MS (1996) Catalytic effects for hydrogen photogeneration due to metallic deposition on p-GaAs. Int J Hydrogen Energy, 21 547-553... 

Surface Aspects of Hydrogen Photogeneration on Titanium Oxides... 

A hydrogen-producing stoichiometric photoreaction occurs between pre-reduced SrTi03 and 0 7 Torr water vapor.(14) At these low pressures surface TI3 and hydroxyl species can be observed by photoelectron spectroscopies. Comparison of the reaction conditions required for hydrogen photogeneration from low pressure water vapor and from aqueous electrolyte allows some speculation as to the roles of hydroxyl species. 

Table I. Hydrogen Photogeneration from Stoichiometric, Initially Metal-Free, Sr KOs in Various Electrolytes (prereduced crystal 30% NaOH = 10M)...

The presence of carbon contamination on SrTi03 surfaces raises the question of whether a carbonaceous species, rather than water, is oxidized during hydrogen photogeneration on Pt-free... 

III-7. Hydrogen Photogeneration from Low-Pressure Water Vapor. Water vapor can react with oxygen vacancies of illuminated pre-reduced SrTi03 surfaces to yield hydrogen and lattice oxide.(14) Vacuum-prepared (111) surfaces of pre-reduced and stoichiometric SrTi03 were heated to 400°C in 10 Torr D2O in a UHV system equipped with a quadrupole mass spectrometer. Illumination of the pre-reduced crystal caused an increase in the D2 pressure of the system equivalent to D2 production of 3 mono-layers/hr. No such effect was seen on the stoichiometric crystal. 

Hydrogen photogenerated radicals + Oxidised nitrogen species... 

Yuan Y-J, Yu Z-T, Liu X-J, Cai J-G, Guan Z-J, Zou Z-G (2014) Hydrogen photogeneration promoted by efficient electron transfer from iridium sensitizers to colloidal M0S2 catalysts. Sci Rep 4 4045... 

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