Electronic Supplementary Material (ESI) for Dalton Transactions This journal is © The Royal Society of Chemistry 2014
Electronic Supplementary Information Ag2S/g-C3N4 Composite Photocatalysts for Efficient Pt-free Hydrogen Production. The Co-catalyst Function of Ag/Ag2S Formed by Simultaneous Photodeposition Deli Jiang,* Linlin Chen, Jimin Xie, and Min Chen* School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China * Corresponding author: E-mail address:
[email protected],
[email protected].
Electronic Supplementary Material (ESI) for Dalton Transactions This journal is © The Royal Society of Chemistry 2014
(a)
1.4
(ah)1/2(eV)1/2
1.2 1.0 0.8 0.6 0.4 2.69 eV
0.2 0.0 2.4
2.5
2.6
2.7
2.8
2.9
3.0
3.1
3.2
3.3
3.4
h (eV)
(b)
7 6
(ah)2(eV)2
5 4 3 2 0.97 eV 1 0 0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
h (eV)
Fig. S1. (a) Plot of (αhν)1/2 versus energy (hν) for the band gap energy of g-C3N4 and (b) the plot of (αhν)2 versus energy (hν) for the band gap energy of Ag2S.
Electronic Supplementary Material (ESI) for Dalton Transactions This journal is © The Royal Society of Chemistry 2014
10
H2 production ( mol h-1)
g-C3N4 1 % Ag2S/g-C3N4
8
2 % Ag2S/g-C3N4 5 % Ag2S/g-C3N4
6
10 % Ag2S/g-C3N4 Ag2S
4 2 0 0
1
2 Time (h)
3
4
Fig. S2. Time course of H2 evolution from 25% methanol aqueous solution (20 mL methanol + 60 mL distilled water) over Ag2S/g-C3N4 composites as well as pure g-C3N4 and Ag2S samples.
200
a
b
180 160
Intensity (a.u.)
140 120 100 Ag (111)
80
Ag (200)
60 40 20 0 10
20
30
40
50
60
70
80
2 Theta (degree)
Fig. S3. (a) TEM image and (b) XRD pattern of Ag/g-C3N4 composite. Synthesis of Ag/g-C3N4 composite: Ag/g-C3N4 composite photocatalysts were prepared by photoreduction method. Typically, 0.05 g of g-C3N4 powders and 0.05 g of AgNO3 were dispersed in 50 mL water. The solution was then irradiated under
Electronic Supplementary Material (ESI) for Dalton Transactions This journal is © The Royal Society of Chemistry 2014
Xenon lamp (300 W) for 5 h. The product was collected by centrifugation, washed with distilled water and absolute ethanol, and dried in an oven at 60 °C for 12h.
Table S1. Measured N2 sorption parameters for the different samples Sample g-C3N4 1 % Ag2S/g-C3N4 2 % Ag2S/g-C3N4 5 % Ag2S/g-C3N4 10 % Ag2S/g-C3N4
Surface area Pore volume (m2·g-1) (cm3·g-1) 17.2296 0.01456 13.2470 0.01500 17.2487 0.01209 13.0188 0.01577 12.7641 0.01512