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Effect of the agglomerated state on the photocatalytic hydrogen production with in situ agglomeration of colloidal TiO2 nanoparticles

Authors
Lakshminarasimhan, NarayananKim, WooyulChoi, Wonyong
Issue Date
Dec-2008
Publisher
American Chemical Society
Citation
Journal of Physical Chemistry C, v.112, no.51, pp 20451 - 20457
Pages
7
Journal Title
Journal of Physical Chemistry C
Volume
112
Number
51
Start Page
20451
End Page
20457
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159095
DOI
10.1021/jp808541v
ISSN
1932-7447
1932-7455
Abstract
The photocatalytic production of H2 in aqueous TiO2 colloid (with methanol as an electron donor) was greatly accelerated by the in situ agglomeration of the colloid although such an agglomeration should reduce the photocatalytic activity in most other cases because of the reduction of the surface area. The in situ agglomeration occurred after an induction period of 3 h and was ascribed to the pH increase which was resulted from the photocatalytic reduction of nitrate (incorporated from the synthetic step of TiO2 sol) to ammonia. The agglomeration occurred at pH close to the isoelectric point of colloidal TiO2 which was 6.9 as measured by the ζ-potential. It is proposed that the charge separation is facilitated by electron hopping from particle to particle when TiO2 nanoparticles are connected with each other within the agglomerates. This behavior was further supported by the photocurrent collection measurement (mediated by the methyl viologen MV /MV redox couple in the colloidal solution), which also showed a rapid increase in the photocurrent after the agglomeration of TiO 2 nanoparticles. When the colloid of TiO2 was initially coagulated at around pH 6, the production of hydrogen increased linearly with time without showing an induction period and the collected photocurrent showed an immediate increase upon ir
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