High-Efficiency Photochemical Water Splitting of CdZnS/CdZnSe Nanostructures
| Autor: | Arun Prakash Periasamy, Zusing Yang, Chen-I Wang, Huan-Tsung Chang |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Photocurrent
Materials science Article Subject business.industry Band gap Energy conversion efficiency Photochemistry Wavelength Saturated calomel electrode Electrode lcsh:TA401-492 Optoelectronics Water splitting lcsh:Materials of engineering and construction. Mechanics of materials business Chemical bath deposition |
| Zdroj: | Journal of Materials, Vol 2013 (2013) |
| ISSN: | 2314-4874 2314-4866 |
| Popis: | We have prepared and employed TiO2/CdZnS/CdZnSe electrodes for photochemical water splitting. The TiO2/CdZnS/CdZnSe electrodes consisting of sheet-like CdZnS/CdZnSe nanostructures (8–10 μm in length and 5–8 nm in width) were prepared through chemical bath deposition on TiO2 substrates. The TiO2/CdZnS/CdZnSe electrodes have light absorption over the wavelength 400–700 nm and a band gap of 1.87 eV. Upon one sun illumination of 100 mW cm−2, the TiO2/CdZnS/CdZnSe electrodes provide a significant photocurrent density of 9.7 mA cm−2 at −0.9 V versus a saturated calomel electrode (SCE). Incident photon-to-current conversion efficiency (IPCE) spectrum of the electrodes displays a maximum IPCE value of 80% at 500 nm. Moreover, the TiO2/CdZnS/CdZnSe electrodes prepared from three different batches provide a remarkable photon-to-hydrogen efficiency of 7.3 ± 0.1% (the rate of the photocatalytically produced H2 by water splitting is about 172.8 mmol·h−1·g−1), which is the most efficient quantum-dots-based photocatalysts used in solar water splitting. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text