SCHEDULED MAINTENANCE
Intercalation of titanium oxide in layered H2Ti4O9 and H4Nb6O17 and photocatalytic water cleavage with H2Ti4O9/(TiO2, Pt) and H4Nb6O17/(TiO2, Pt) nanocomposites
Abstract
Titanium oxide and platinum have been intercalated into
H
2
Ti
4
O
9
and
H
4
Nb
6
O
17
by the successive
reactions of H
2
Ti
4
O
9
and
H
4
Nb
6
O
17
with
[Pt(NH
3
)
4
]Cl
2
,
n-C
3
H
7
NH
2
and
acidic TiO
2
colloid solutions followed by UV
light irradiation. The thicknesses of titanium oxide and
platinum were less than 0.7 nm. The band gap energy of the
titanium oxide incorporated was less than 3.4 eV. The rate
constants for the charge injection from excited
TiO
2
into the conduction band of
H
2
Ti
4
O
9
and
H
4
Nb
6
O
17
were determined to
be 0.11×10
9
and 0.12×10
9
s
-1
, respectively, by measuring the
TiO
2
emission lifetimes in TiO
2
incorporatednanocomposites.
H
2
Ti
4
O
9
/(TiO
2
,
Pt) and
H
4
Nb
6
O
17
/(TiO
2
,Pt) nanocomposites (intercalated with both TiO
2
and Pt) werecapable of water cleavage into hydrogen and
oxygen without a hole scavenger, at 0.088–0.104 mmol
h
-1
, following irradiation from a 450 W Hg lamp,
although no noticeable gas was evolved in the presence of
H
2
Ti
4
O
9
/TiO
2
,
H
4
Nb
6
O
17
/TiO
2
,
H
2
Ti
4
O
9
/Pt,
H
4
Nb
6
O
17
/Pt and unsupported
TiO
2
/Pt. The hydrogen and oxygen evolution was
linear with time and the niobate system was fairly
efficient.
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