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Supplementary Information:
Factors Affecting Oxygen Evolution through Water Oxidation on
Polycrystalline Titanium Dioxide
Yuuya Nishimotoa, Yuichi Hasegawab, Kenta Adachia and Suzuko Yamazakia*
a Division of Environmental Science and Engineering, Graduate School of Science and
Engineering, Yamaguchi University, Yamaguchi 753-8512, Japan
b Department of Biology and Chemistry, Faculty of Science, Yamaguchi University,
Yamaguchi 753-8512, Japan
Electronic Supplementary Material (ESI) for RSC Advances.This journal is © The Royal Society of Chemistry 2016
Fig. S1 Emission spectrum of super-high-pressure Hg lamp through a U330 bandpass filter.
2 4 6 8 10 12 14
dV/ d
D(a
.u.)
Pore diameter (nm)
(a) TiO2-D
200
300
400
500
600
2 4 6 8 10 12 14
dV / d
D (a
.u.)
Pore diameter (nm)
(b) TiO2-ND
200
300
400
500
600
Fig. S2 Pore size distributions of (a) TiO2-D and (b) TiO2-ND calcined at 200–600°C for 2 hours.
-80
-60
-40
-20
0
20
40
60
0 1 2 3 4 5 6 7 8 9 10 11 12Ze
ta p
oten
tial (
mV)
pH
Fig. S3 Zeta potential of TiO2 nanocolloid as a function of pH value.
10 30 50 70 90
Inte
nsity
(a.u
.)
2θ (degree)
(a) anatase
rutile
brookite
200
300
400
500
10 30 50 70 90
Inte
nsity
(a.u
.)
2θ (degree)
(b)rutile
600
700
800
900
Fig. S4 XRD patterns of TiO2-D calcined at (a) 200–500°C and (b) 600–900°C for 2 hours.
10 30 50 70 90
Inte
nsity
(a.u
.)
2θ (degree)
(a) rutile
brookite
anatase
200
300
400
500
10 30 50 70 90
Inte
nsity
(a.u
.)
2θ (degree)
(b)
rutile
600
700
800
900
Fig. S5 XRD patterns of TiO2-ND calcined at (a) 200–500°C and (b) 600–900°C for 2 hours.
-30
-20
-10
0
10
20
80
85
90
95
100
30 230 430 630 830
Hea
t flo
w (
a.u.
)
Wei
ght (
%)
Temperature (°C)
TG
DTA
-50
-40
-30
-20
-10
0
10
80
85
90
95
100
30 230 430 630 830
Hea
t flo
w (
a.u.
)
Wei
ght (
%)
Temperature (°C)
TG
DTA
(a) (b)
Fig. S6 TG and DTA curves for (a) TiO2-D and (b) TiO2-ND calcined at 200°C for 2 hours.
0
20
40
60
80
100
120
140
160
0 30 60 90 120
Amou
nt o
f evo
lved
O2(μ
mol
)
Irradiation time (min)
0.001 [mol/L]
0.002 [mol/L]
0.003 [mol/L]
0.01 [mol/L]
Fig. S7 Time courses of O2 evolution from 0.001–0.01 mol L–1 AgNO3 solution on TiO2-ND calcined at 800°C for 2 hours under UV light irradiation.
0102030405060708090100
200 400 700 800 900Cry
stal
pha
se c
ompo
sitio
n (%
)
Calcination temperature (oC)
(a)
0102030405060708090100
200 400 700 800 900Cry
stal
pha
se c
ompo
sitio
n (%
)
Calcination temperature (oC)
(b)
Fig. S8 Crystalline phase composition of (a) TiO2-D and (b) TiO2-ND calcined 200–900°C for 10 hours. (Red: anatase, green: brookite, blue: rutile.)
0
20
40
60
80
100
0 20 40 60 80
O2ev
olut
ion
rate
(μm
olh–
1 )
Dav (nm)
TiO₂-D, 2hTiO₂-ND, 2hTiO₂-D, 10hTiO₂-ND, 10h
Fig. S9 Relationships between Dav and O2 evolution rate on TiO2-D and TiO2-ND calcined at 200–900°C for 2 or 10 hours.
