Photochemical hydrogen production from a water-methanol mixture with small particles of iron oxide suspensions

Journal Article · Sat Feb 01 04:00:00 EST 1986 · Mater. Res. Bull.; (United States)

DOI:https://doi.org/10.1016/0025-5408(86)90200-X· OSTI ID:5918805

Nakanishi, H; Sanchez, C; Hendewerk, M; Somoriar, G A

Photochemical hydrogen production has been detected from small particles of doped iron oxide in a methanol-water (1:1) mixture. The systems studied consisted of a pure N-type semiconductor, Fe/sub 2-x/NB/sub x/O/sub 3/ (x=0.02), a pure P-type semiconductor, La/sub 1-x/Sr/sub x/FeO/sub 3/ (x=0.25), and Mg-doped ..cap alpha..-Fe/sub 2/O/sub 3/. This system was found to be heterogeneous, consisting of both spinel and corundum phase iron oxides, and shows a much higher activity than the pure single phase systems, with either corundum (..cap alpha..-FE/sub 2/O/sub 3/) or spinel (Fe/sub 3-x/Mg/sub x/O/sub y/) structure. The efficiency of the reaction increased substantially when the powders were loaded with PT. Hydrogen production from these Mg-doped iron oxides is photo-ocatalytic and occurs mainly as a result of bandgap irradiation, but also occurs with sub-bandgap illumination in small amounts. There is a linearly increasing dependence of the H/sub 2/ production with increasing light intensity.

• Research Organization: Department of Chemistry and Materials and Molecular Research Division, Lawrence Berkeley Laboratory, University of California, Berkeley, CA
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5918805
• Journal Information: Mater. Res. Bull.; (United States), Journal Name: Mater. Res. Bull.; (United States) Vol. 21:2; ISSN MRBUA
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
080106* -- Hydrogen-- Production-- Biosynthesis & Photochemical Processes
14 SOLAR ENERGY
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
ALCOHOLS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CORUNDUM
DOPED MATERIALS
ELEMENTS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
HYDROXY COMPOUNDS
IRON COMPOUNDS
IRON OXIDES
MAGNESIUM
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MATERIALS
METALS
METHANOL
MINERALS
N-TYPE CONDUCTORS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
P-TYPE CONDUCTORS
PARTICLE SIZE
PARTICLES
PHOTOCHEMICAL REACTIONS
PLATINUM
PLATINUM METALS
POWDERS
SEMICONDUCTOR MATERIALS
SIZE
SPINELS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WATER