TY - JOUR
T1 - Visible-light-induced and long-lived charge separation in a transparent nanostructured semiconductor membrane modified by an adsorbed electron donor and electron acceptor
AU - Hoyle, Robert
AU - Sotomayor, Joao
AU - Will, Geoffrey
AU - Fitzmaurice, Donald
PY - 1997/12/11
Y1 - 1997/12/11
N2 - The preparation of transparent nanostructured TiO2 (anatase) membranes is described. Detailed characterization shows these membranes to be 50 μm thick nanoporous-nanocrystalline structures with associated values for porosity and surface roughness of 50% and 5000, respectively. Modification of these membranes by coadsorption of a ruthenium complex, bis[(4,4′-dicarboxy-2,2′-bipyridine)(4,4′-dimethyl-2,2′- bipyridine)-ruthenium(II)] dichloride (I), and of a viologen, 1-ethyl-1′-[(4-carboxy-3-hydroxyphenyl)methyl]-4,4′-bipyridinium perchlorate (II), is also described. Detailed studies show that visible-light-induced electron transfer by electronically excited I to the conduction band of the nanostructured TiO2 membrane is followed by membrane mediated electron transfer to coadsorbed II. Detailed studies also show that, as a consequence of the rectifying properties of the semiconducting membrane, charge separation is long-lived. The possible significance of these findings for the development of a practical water splitting device is considered.
AB - The preparation of transparent nanostructured TiO2 (anatase) membranes is described. Detailed characterization shows these membranes to be 50 μm thick nanoporous-nanocrystalline structures with associated values for porosity and surface roughness of 50% and 5000, respectively. Modification of these membranes by coadsorption of a ruthenium complex, bis[(4,4′-dicarboxy-2,2′-bipyridine)(4,4′-dimethyl-2,2′- bipyridine)-ruthenium(II)] dichloride (I), and of a viologen, 1-ethyl-1′-[(4-carboxy-3-hydroxyphenyl)methyl]-4,4′-bipyridinium perchlorate (II), is also described. Detailed studies show that visible-light-induced electron transfer by electronically excited I to the conduction band of the nanostructured TiO2 membrane is followed by membrane mediated electron transfer to coadsorbed II. Detailed studies also show that, as a consequence of the rectifying properties of the semiconducting membrane, charge separation is long-lived. The possible significance of these findings for the development of a practical water splitting device is considered.
UR - http://www.scopus.com/inward/record.url?scp=0031358122&partnerID=8YFLogxK
U2 - 10.1021/jp9711297
DO - 10.1021/jp9711297
M3 - Article
AN - SCOPUS:0031358122
SN - 1089-5647
VL - 101
SP - 10791
EP - 10800
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 50
ER -