g-C3N4 Composite

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Ag2S/g-C3N4 Composite Photocatalysts for Efficient Pt-free. Hydrogen Production. The Co-catalyst Function of Ag/Ag2S ... methanol + 60 mL distilled water) over Ag2S/g-C3N4 composites as well as pure. g-C3N4 and Ag2S samples. Fig. S3.
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