TY - JOUR
T1 - Free-standing carbon nanotube-titania photoactive sheets
AU - Koo, Youngmi
AU - Malik, Rachit
AU - Alvarez, Noe
AU - Shanov, Vesselin N.
AU - Schulz, Mark
AU - Sankar, Jagannathan
AU - Yun, Yeo Heung
PY - 2015/6/5
Y1 - 2015/6/5
N2 - We report on the development of a new photoactive material via titania (TiO2) nanoparticle deposition on free-standing aligned carbon nanotube (CNT) sheets. Controlling homogeneous dispersion of negatively charged TiO2 nanoparticles, achieved by adjusting pH higher than the point of zero charge (PZC), influenced electrochemical deposition of TiO2 on CNT sheets substrate. Varying deposition time with constant voltage, 5V allowed different thickness of TiO2 to be deposited layer on the CNT sheets. The thickness and morphology of CNT-TiO2 sheets was verified by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical experiments show that diffusion coefficient of Fe(CN)63- was 5.56×10-6cm2s-1 at pristine CNT sheets and 2.19×10-6cm2s-1 at the CNT-TiO2 sheets. Photocatalytic activity for CNT-TiO2 sheets exhibits high photocurrent density (when deposition time=30min, 4.3μAcm-2 in N2, 13.4μAcm-2 in CO2). This paper proved a possibility to use CNT-TiO2 sheets based on highly-aligned CNT sheets substrate as new photoactive material.
AB - We report on the development of a new photoactive material via titania (TiO2) nanoparticle deposition on free-standing aligned carbon nanotube (CNT) sheets. Controlling homogeneous dispersion of negatively charged TiO2 nanoparticles, achieved by adjusting pH higher than the point of zero charge (PZC), influenced electrochemical deposition of TiO2 on CNT sheets substrate. Varying deposition time with constant voltage, 5V allowed different thickness of TiO2 to be deposited layer on the CNT sheets. The thickness and morphology of CNT-TiO2 sheets was verified by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). Electrochemical experiments show that diffusion coefficient of Fe(CN)63- was 5.56×10-6cm2s-1 at pristine CNT sheets and 2.19×10-6cm2s-1 at the CNT-TiO2 sheets. Photocatalytic activity for CNT-TiO2 sheets exhibits high photocurrent density (when deposition time=30min, 4.3μAcm-2 in N2, 13.4μAcm-2 in CO2). This paper proved a possibility to use CNT-TiO2 sheets based on highly-aligned CNT sheets substrate as new photoactive material.
KW - A. Carbon nanotube sheets
KW - B. Titanium oxide
KW - C. Electrochemical deposition
KW - D. Carbon support
KW - E. Electrocatalysis
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U2 - 10.1016/j.jcis.2015.02.022
DO - 10.1016/j.jcis.2015.02.022
M3 - Article
SN - 0021-9797
VL - 448
SP - 148
EP - 155
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
IS - 0
ER -