402
S. Datta and S. Roy
10
20
30
40
50
60
70
80
(200)
(112)
(004)
(103)
(101)
Intensity (a.u)
2 theta (degree)
KMnO 4 - TiO 2 10wt%
KMnO 4 - TiO 2 6wt%
KMnO 4 - TiO 2 2wt%
20 21 22 23 24 25 26 27 28 29 30
(101)
Intensity (a.u)
2 theta (degree)
a
b
KMnO 4 - TiO 2 10wt%
KMnO 4 - TiO 2 6wt%
KMnO 4 - TiO 2 2wt%
Fig. 3 XRD pattern of a KMnO 4 –TiO 2 (2, 6, 10 wt%) b Shifting of d-space for KMnO 4 –TiO 2 (2,
6, 10 wt%)
a
300
350
400
450
500
550
600
650
700
750
800
0.0
0.5
1.0
1.5
2.0
2.5
Absorbance (A.U.)
Wavelength (nm)
KMnO 4 - TiO 2 10wt%
KMnO 4 - TiO 2 6wt%
KMnO 4 - TiO 2 2wt%
TiO 2 pure
b
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
50
100
150
200
250
300
350
400
450
500
550
3.6 eV
1.7 eV
1.9 eV
1.45 eV
αhv
2
(eV/cm)
2
hv (eV)
KMnO 4 - TiO 2 10wt%
KMnO 4 - TiO 2 6wt%
KMnO 4 - TiO 2 2wt%
TiO 2 pure
Fig. 4 a Absorbance–wavelength plot KMnO 4 –TiO 2 (0, 2, 6, 10 wt%) b Tauc’s plot of KMnO 4 –
TiO 2 (0, 2, 6, 10 wt%)
a
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Current density (mA/cm
2
)
Voltage (V)
KMnO 4 - TiO 2 10wt%
KMnO 4 - TiO 2 6wt%
KMnO 4 - TiO 2 2wt%
TiO 2 pure
b
0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70
0.000
0.005
0.010
0.015
0.020
0.025
0.030
0.035
0.040
0.045
0.050
0.055
Power (mW)
Voltage (V)
KMnO 4 - TiO 2 10wt%
KMnO 4 - TiO 2 6wt%
KMnO 4 - TiO 2 2wt%
TiO 2 pure
Fig. 5 a J–V curve of KMnO 4 –TiO 2 (0, 2, 6, 10 wt%) b P–V curve of KMnO 4 –TiO 2 (0, 2, 6,
10 wt%) DSSC cell