CdS or CdSe Decorated TiO CdS or CdSe Decorated TiO 2 Nanotube CdS - - PowerPoint PPT Presentation

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CdS or CdSe Decorated TiO CdS or CdSe Decorated TiO 2 Nanotube CdS - - PowerPoint PPT Presentation

Mar 03, 2023 104 likes •227 views

KOREA-USA Nanoforum CdS or CdSe Decorated TiO CdS or CdSe Decorated TiO 2 Nanotube CdS or CdSe Decorated TiO CdS or CdSe Decorated TiO 2 Nanotube Nanotube Nanotube Arrays from Spray Arrays from Spray Pyrrolysis Pyrrolysis Deposition:

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SLIDE 1

KOREA-USA Nanoforum

CdS or CdSe Decorated TiO CdS or CdSe Decorated TiO2 Nanotube Nanotube CdS or CdSe Decorated TiO CdS or CdSe Decorated TiO2 Nanotube Nanotube Arrays from Spray Arrays from Spray Pyrrolysis Pyrrolysis Deposition: Deposition: U i Ph l h i l C ll U i Ph l h i l C ll Use in Photoelectrochemical Cells Use in Photoelectrochemical Cells

Sungkyunkwan Sungkyunkwan University University Jong Jong Hyeok Hyeok Park Park

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SLIDE 2

Solar Resource Solar Resource

165,000 TW of Sunlight hit the earth Additional Energy about 30 TW h ld b d d til 2050 should be produced until 2050

One of Possible Strategies: Solar Energy Solar Energy

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SLIDE 3

Energy Conversion Strategies Energy Conversion Strategies

Energy Conversion Strategies Energy Conversion Strategies Energy Conversion Strategies

Light Fuel Electricity

Energy Conversion Strategies

Light Fuel Electricity Electricity

Electricity Fuels

CO2 O H Electricity

Electricity Fuels

CO2 O H CO2 Sugar O2 H2 e

SC M

e

SC M

CO2 Sugar O2 H2 e

SC M

e

SC M

H2O O2 Photosynthesis Semiconductor / Liquid Photovoltaics H2O H2O O2 Photosynthesis Semiconductor / Liquid Photovoltaics H2O Photosynthesis Junctions Photovoltaics Photosynthesis Junctions Photovoltaics

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SLIDE 4

Nanostructured Nanostructured Materials Materials

Nano Lett. 6, 24 (2006).

  • Appl. Phys. Lett. 89, 163106 (2006)
  • Chem. Comm. 2867 (2008).
  • J. Mater. Chem. 20, 2247 (2010).
  • Chem. Comm. 2385 (2010).

ACS Appl. Mater. & Inter. 2, 288 (2010).

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SLIDE 5

In My Poster: In My Poster: QDs QDs Coated TiO Coated TiO2 NTs NTs

CdS or CdSe precursor solution TiO2 NT CdS or CdSe Ti foil Hot Plate (~450oC)

Spray Pyrolysis Method: 1. Simple 2. Suitable for large area coating 3. Precursor solution spray during thermal annealing of substrates

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SLIDE 6

Analysis of Mechanism: Analysis of Mechanism: High Current Density

High Current Density

⊖

  • ⊖

⊖

  • ⊖
  • 9

10 11

m2)

3μmTiO2NTs CdSe/3μm CdS/0.4μm CdSe/0 4μm

⊖

TiO2 NT Q.D

  • 5

6 7 8

rrent (mA/cm

CdSe/0.4μm

TiO NT Q.D

⊖

  • ⊖

1 2 3 4

Photocu

TiO2 NT Q

  • 1.0
  • 0.8
  • 0.6
  • 0.4
  • 0.2

0.0

Potential (V) vs Ag/AgCl

10

Aqueous solution: 0.35 M Na2SO3 + 0.24 M Na2S.

6 8

cy (%)

2 4

Efficienc

( ) [ ( )]/ ]

  • 1.2
  • 1.0
  • 0.8
  • 0.6
  • 0.4
  • 0.2

0.0 0.2

Potential (V vs. Ag/AgCl)

η(%) = [Jp × (1.23 – Eapp)]/Plight]

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SLIDE 7

Length= 600nm Length=1500nm

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SLIDE 8

CdS NPs coupled TiO CdS NPs coupled TiO2 NRs NRs -

  • SPD

SPD

0.1M CdCl2 0.1M thiourea

CdS nanoparticle TiO2 nanorod Hot plate(450℃) FTO glass

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SLIDE 9

CdS NPs coupled TiO CdS NPs coupled TiO2 NRs NRs -

  • SPD

SPD

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SLIDE 10

Unassisted Water Splitting Unassisted Water Splitting

N-type SC Pt Dye-coated TiO2 N type SC e- h+ I- I3

  • e-

e- Dye h+ e- I TiO2 e- e- Ti-foil or SUS foil

2H+ + 2e- → H2

h+ N-type SC e

H2O + 2h+ → 2H+ + 1/2O2

h+

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SLIDE 11

See You at Poster Session See You at Poster Session See You at Poster Session See You at Poster Session