TY - JOUR
T1 - Preparation of TiO2-SiO2 aperiodic mesoporous materials with controllable formation of tetrahedrally coordinated Ti 4+ ions and their performance for photocatalytic hydrogen production
AU - Wu, Chia Ming
AU - Peng, Rui
AU - Dimitrijevic, Nada M.
AU - Rajh, Tijana
AU - Koodali, Ranjit T.
N1 - Funding Information:
This work was supported by DE-EE 0000270 , NSF-CHE 0722632 , and NSF-EPS 0903804 . Use of the Center for Nanoscale Materials was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences , under Contract No. DE-AC02-06CH11357.
PY - 2014/1/2
Y1 - 2014/1/2
N2 - The efficiency of photocatalytic water splitting for TiO2 dispersed on four SiO2 aperiodic porous supports is discussed in this work. The four TiO2-SiO2 composite materials were prepared via a sol-gel method and then subjected to supercritical drying, natural drying, rotatory vapor drying, or hydrothermal synthesis and the materials were subsequently calcined under identical conditions. These synthetic strategies result in differences in textural properties (specific surface area, pore diameter etc.) and in the amount of tetrahedrally coordinated Ti 4+ ions. The TiO2-SiO2 materials were thoroughly characterized by powder X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (DRS), nitrogen adsorption studies, FT-IR spectroscopy, transmission electron microscopic (TEM) studies, and electron paramagnetic resonance (EPR) studies. The photocatalytic activity for hydrogen production is maximum when the amount of tetrahedrally coordinated Ti4+ ions is high. Thus, this work provides guidance towards the preparation of photoactive materials for generating hydrogen from water.
AB - The efficiency of photocatalytic water splitting for TiO2 dispersed on four SiO2 aperiodic porous supports is discussed in this work. The four TiO2-SiO2 composite materials were prepared via a sol-gel method and then subjected to supercritical drying, natural drying, rotatory vapor drying, or hydrothermal synthesis and the materials were subsequently calcined under identical conditions. These synthetic strategies result in differences in textural properties (specific surface area, pore diameter etc.) and in the amount of tetrahedrally coordinated Ti 4+ ions. The TiO2-SiO2 materials were thoroughly characterized by powder X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (DRS), nitrogen adsorption studies, FT-IR spectroscopy, transmission electron microscopic (TEM) studies, and electron paramagnetic resonance (EPR) studies. The photocatalytic activity for hydrogen production is maximum when the amount of tetrahedrally coordinated Ti4+ ions is high. Thus, this work provides guidance towards the preparation of photoactive materials for generating hydrogen from water.
KW - Aperiodic mesoporous material
KW - Hydrogen production
KW - Silicon dioxide
KW - Tetrahedrally coordinated Ti ion
KW - Titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=84890435159&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84890435159&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2013.10.079
DO - 10.1016/j.ijhydene.2013.10.079
M3 - Article
AN - SCOPUS:84890435159
SN - 0360-3199
VL - 39
SP - 127
EP - 136
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 1
ER -