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Heterostructured Ceramic Powders for Photocatalytic Hydrogen Production: Nanostructured TiO 2 Shells Surrounding Microcrystalline ( Ba , Sr ) TiO 3 Cores
Author(s) -
Li Li,
Rohrer Gregory S.,
Salvador Paul A.
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05076.x
Subject(s) - photocatalysis , microcrystalline , materials science , nanocrystalline material , nanoporous , crystallinity , chemical engineering , hydrogen production , catalysis , nanotechnology , chemistry , crystallography , composite material , biochemistry , engineering
Heterostructured photocatalysts were prepared to have nanostructured ( ns ) TiO 2 shells surrounding microcrystalline ( mc ) cores of ( Ba , Sr ) TiO 3 . The as‐prepared heterostructures were annealed between 400°C and 600°C to improve crystallinity and core‐shell interfacial bonding. X‐ray diffraction, electron microscopy, and gas adsorption measurements demonstrated that 50 nm thick shells composed of nanocrystalline and nanoporous TiO 2 surrounded mc ‐cores such that the heterostructured particles had surface areas of 50–100 m 2 /g. The mc ‐( Ba , Sr ) TiO 3 / ns ‐ TiO 2 core‐shell photocatalysts annealed at 600°C had slightly reduced surface areas, but had the highest rates of photochemical hydrogen production from water/methanol solutions, rates much greater than those for ns ‐ TiO 2 or mc ‐( Ba , Sr ) TiO 3 alone. Such heterostructured powders represent a new strategy for the design of efficient photocatalysts and the use of nanostructured catalytic coatings.