TY - JOUR
T1 - Light-harvesting TiO2 nanotube arrays decorated with functional photo- And electrocatalysts
AU - Park, Hyunwoong
PY - 2011
Y1 - 2011
N2 - TiO2 nanotube arrays (TiNT) have received growing attentions from various research fields such as hydrogen-sensing, photoelectrochemical water splitting, solar cells, and biological applications. The synthesis of TiNT is rather simple and straightforward; DC-anodizataion of Ti foil in fluoride-based electrolytes results in highly ordered and vertically self-aligned TiNT. Since TiNT provides a unique and robust nanoporous tubular architectures, it can serve as a platform for anchoring various photo- and electrocatalyst nanomaterials. This study presents applications of TiNT as a support for iron oxide nanoparticles. Alpha-Fe2O3 (hematite) nanoparticles were electrodeposited at TiNT, which was subsequently annealed at 550 degree Celsius for 6 hours in the presence of air. For comparison, TiO2 nanoparticles (TiNP) were obtained via oxidative annealing of Ti foil. As-prepared hematite/TiNT was found to have much higher photoelectrochemical performances than hematite/TiNP under visible light (> 420 nm) whereas its performances decreased at AM 1.5 condition as compared to hematite/TiNP. Such behaviors are likely to be attributed to site-selective photocatalytic activities of TiNT. More detailed surface characterization for TiNT and TiNP without or with hematite particles via TEM, SEM, XPS, XRD, UV-vis, EDX, Raman, etc will be presented and discussed. Finally, other applications of TiNT hybrids with Co-phosphate and polyoxometalates will be presented.
AB - TiO2 nanotube arrays (TiNT) have received growing attentions from various research fields such as hydrogen-sensing, photoelectrochemical water splitting, solar cells, and biological applications. The synthesis of TiNT is rather simple and straightforward; DC-anodizataion of Ti foil in fluoride-based electrolytes results in highly ordered and vertically self-aligned TiNT. Since TiNT provides a unique and robust nanoporous tubular architectures, it can serve as a platform for anchoring various photo- and electrocatalyst nanomaterials. This study presents applications of TiNT as a support for iron oxide nanoparticles. Alpha-Fe2O3 (hematite) nanoparticles were electrodeposited at TiNT, which was subsequently annealed at 550 degree Celsius for 6 hours in the presence of air. For comparison, TiO2 nanoparticles (TiNP) were obtained via oxidative annealing of Ti foil. As-prepared hematite/TiNT was found to have much higher photoelectrochemical performances than hematite/TiNP under visible light (> 420 nm) whereas its performances decreased at AM 1.5 condition as compared to hematite/TiNP. Such behaviors are likely to be attributed to site-selective photocatalytic activities of TiNT. More detailed surface characterization for TiNT and TiNP without or with hematite particles via TEM, SEM, XPS, XRD, UV-vis, EDX, Raman, etc will be presented and discussed. Finally, other applications of TiNT hybrids with Co-phosphate and polyoxometalates will be presented.
UR - http://www.scopus.com/inward/record.url?scp=80051895481&partnerID=8YFLogxK
M3 - Conference article
AN - SCOPUS:80051895481
SN - 0065-7727
JO - ACS National Meeting Book of Abstracts
JF - ACS National Meeting Book of Abstracts
T2 - 241st ACS National Meeting and Exposition
Y2 - 27 March 2011 through 31 March 2011
ER -
