CdS/TiO2 Heterojunction Semiconductor Photocatalyst

Taylor Marino, Nicole Moore, William Neer

Overview• Applications• Type II Heterojunction Semiconductor• CdS/TiO2 Nanocomposite• Method of Synthesis• Methods of Characterization

Applications

• Reduction of CO2

• Charge Collection

• Production of Biofuels Assistance

Marschall, R. Semiconductor Composites: Strategies for Enhancing Charge Carrier Separation to Improve Photocatalytic Activity. Adv. Funct. Mater. [Online] 2014, 24, 2421–2440.

Applications

Water Splitting

Marschall, R. Semiconductor Composites: Strategies for Enhancing Charge Carrier Separation to Improve Photocatalytic Activity. Adv. Funct. Mater. [Online] 2014, 24, 2421–2440.

Type II Heterojunction

TiO2

H2OH+, OH

e-

CdS

h+

CB

VB

CB

VB

Identity and Structure-- -- 1 00 nm

- ---- -- 1 00 nm- --

-- -- 1 00 nm- --

TiO2

O2O2

-

Red.

H2OH+, OH

e-

CdS

h+

VBH3

VBH

CH2BH2

VBH2

Light

-- -- 1 00 nm- ---- -- 1 00 nm

- ---- -- 1 00 nm

- --

Synthesis MethodStep one: Synthesis of CdS NWs

Stirring 1h

Drying in oven

Solvothermal

180 C 24h

C5H10NNaS2-3H2O

CdCl2-2.5H2O Cd(S2CNEt2)2CdSNWs

Step two: Synthesis of 1D CdS@TiO2CSNs

Stirring

2h

Solvothermal

180 C 15h

CdS NWs and TBOTdispweaws in ethanol

TiO2

CdS NWs1D CdS@TiO2CSNs

Synthesis MethodStep one: Synthesis of CdS NWs

Stirring 1h

Drying in oven

Solvothermal

180 C 24h

C5H10NNaS2-3H2O

CdCl2-2.5H2O Cd(S2CNEt2)2CdSNWs

Step two: Synthesis of 1D CdS@TiO2CSNs

Stirring

2h

Solvothermal

180 C 15h

CdS NWs and TBOTdispweaws in ethanol

TiO2

CdS NWs1D CdS@TiO2CSNs

Characterization XPS

Qin, N.; Liu, Y.; Wu, W.; Shen, L.; Chen, X.; Li, Z.; Wu, L. One-Dimensional CdS/TiO2 Nanofiber Composites as Efficient Visible-Light-Driven Photocatalysts for Selective Organic Transformation: Synthesis, Characterization, and Performance. Langmuir [Online] 2015, 31, 1203-1209.

Characterization XRD

Liu, S.; Zhang, N.; Tang, Z.; Xu, Y. Synthesis of One-Dimensional CdS@TiO2 Core-Shell Nanocomposites Photocatalyst for Selective Redox: The Dual Role of TiO2 Shell. ACS Applied Materials & Interfaces [Online] 2012, 4, 6378-6385.

Characterization SEM

Liu, S.; Zhang, N.; Tang, Z.; Xu, Y. Synthesis of One-Dimensional CdS@TiO2 Core-Shell Nanocomposites Photocatalyst for Selective Redox: The Dual Role of TiO2 Shell. ACS Applied Materials & Interfaces [Online] 2012, 4, 6378-6385.

Characterization UV/Vis

Liu, S.; Zhang, N.; Tang, Z.; Xu, Y. Synthesis of One-Dimensional CdS@TiO2 Core-Shell Nanocomposites Photocatalyst for Selective Redox: The Dual Role of TiO2 Shell. ACS Applied Materials & Interfaces [Online] 2012, 4, 6378-6385.

Summary• Applications• Type II Heterojunction Semiconductor• CdS/TiO2 Nanocomposite• Method of Synthesis• Methods of Characterization