Cu2O/TiO2nanotubes heterojunctions were fabricated by electrochemical deposition of cuprous oxide on TiO2nanotubes arrays grown by anodizing. X-ray diffraction and Raman Spectroscopy analysis allows for identification of Cu2O, whose morphological features were studied by Scanning Electron Microscopy as a function of the charge circulated during the electrodeposition step. Photoelectrochemical measurements in aqueous solutions evidenced a red shift of the light absorption threshold of TiO2nanotubes due to the presence of cuprous oxide even for very low circulated charges, while electrochemical impedance measurements proved a significant reduction of the electrode impedance due the presence of Cu2O. Photoelectrochemical measurements in non aqueous solutions allow to reduce reverse bias across the junction and to measure stationary cathodic photocurrent, thus confirming the formation of p-type Cu2O inside the nanotubes.
Santamaria, M., Conigliaro, G., Di Franco, F., Di Quarto, F. (2014). Photoelectrochemical Evidence of Cu2O/TiO2Nanotubes Hetero-Junctions formation and their Physicochemical Characterization. ELECTROCHIMICA ACTA, 144(144), 315-323.
Photoelectrochemical Evidence of Cu2O/TiO2Nanotubes Hetero-Junctions formation and their Physicochemical Characterization
SANTAMARIA, Monica;DI FRANCO, Francesco;DI QUARTO, Francesco
2014-01-01
Abstract
Cu2O/TiO2nanotubes heterojunctions were fabricated by electrochemical deposition of cuprous oxide on TiO2nanotubes arrays grown by anodizing. X-ray diffraction and Raman Spectroscopy analysis allows for identification of Cu2O, whose morphological features were studied by Scanning Electron Microscopy as a function of the charge circulated during the electrodeposition step. Photoelectrochemical measurements in aqueous solutions evidenced a red shift of the light absorption threshold of TiO2nanotubes due to the presence of cuprous oxide even for very low circulated charges, while electrochemical impedance measurements proved a significant reduction of the electrode impedance due the presence of Cu2O. Photoelectrochemical measurements in non aqueous solutions allow to reduce reverse bias across the junction and to measure stationary cathodic photocurrent, thus confirming the formation of p-type Cu2O inside the nanotubes.File | Dimensione | Formato | |
---|---|---|---|
Cu2OTiO2NTs.pdf
Solo gestori archvio
Dimensione
3.6 MB
Formato
Adobe PDF
|
3.6 MB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.