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Conical islands of TiO2 nanotube arrays in the photoelectrode of dye-sensitized solar cells.

Kim WR, Park H, Choi WY - Nanoscale Res Lett (2015)

Bottom Line: The resulting conical island structures were anodized in ethylene glycol solution containing 0.25 wt% NH4F and 2 vol% H2O, and conical islands composed of TiO2 nanotubes were successfully formed on the Ti foils.The conical island structure was very effective at improving performances of DSCs based on TiO2 nanotubes.DSCs based on the conical islands of TiO2 nanotube arrays have the potential to achieve higher efficiency levels compared to DSCs based on normal TiO2 nanotubes and TiO2 nanoparticles because the conical islands of TiO2 nanotube arrays enlarge the surface area for dye adsorption.

View Article: PubMed Central - PubMed

Affiliation: Department of Metal and Materials Engineering, Gangneung-wonju National University, Gangneung, 210-720 South Korea.

ABSTRACT
Ti conical island structures were fabricated using photolithography and the reactive ion etching method. The resulting conical island structures were anodized in ethylene glycol solution containing 0.25 wt% NH4F and 2 vol% H2O, and conical islands composed of TiO2 nanotubes were successfully formed on the Ti foils. The conical islands composed of TiO2 nanotubes were employed in photoelectrodes for dye-sensitized solar cells (DSCs). DSC photoelectrodes based on planar Ti structures covered with TiO2 nanotubes were also fabricated as a reference. The short-circuit current (J sc) and efficiency of DSCs based on the conical island structures were higher than those of the reference samples. The efficiency of DSCs based on the conical island structures reached up to 1.866%. From electrochemical impedance spectroscopy and open-circuit voltage (V oc) decay measurements, DSCs based on the conical island structures exhibited a lower charge transfer resistance at the counter cathode and a longer electron lifetime at the interface of the photoelectrode and electrolyte compared to the reference samples. The conical island structure was very effective at improving performances of DSCs based on TiO2 nanotubes. Graphical AbstractConical islands of TiO2 nanotube arrays are fabricated by an anodizing process with Ti protruding dots which have a conical shape. The conical islands are applied for use in DSC photoelectrodes. DSCs based on the conical islands of TiO2 nanotube arrays have the potential to achieve higher efficiency levels compared to DSCs based on normal TiO2 nanotubes and TiO2 nanoparticles because the conical islands of TiO2 nanotube arrays enlarge the surface area for dye adsorption.

No MeSH data available.


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Schematic diagram of the anodic oxidation system.
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Fig1: Schematic diagram of the anodic oxidation system.

Mentions: Before the anodizing process, the Ti foils patterned with conical islands were successively ultrasonicated with acetone, ethanol, and deionized (DI) water to remove any residues on the surface of the Ti foils. Conical islands composed of TiO2 nanotubes were fabricated by anodic oxidation of the patterned Ti foils in ethylene glycol solution. The schematic diagram of the anodic oxidation system is shown in Figure 1.Figure 1


Conical islands of TiO2 nanotube arrays in the photoelectrode of dye-sensitized solar cells.

Kim WR, Park H, Choi WY - Nanoscale Res Lett (2015)

Schematic diagram of the anodic oxidation system.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384997&req=5

Fig1: Schematic diagram of the anodic oxidation system.
Mentions: Before the anodizing process, the Ti foils patterned with conical islands were successively ultrasonicated with acetone, ethanol, and deionized (DI) water to remove any residues on the surface of the Ti foils. Conical islands composed of TiO2 nanotubes were fabricated by anodic oxidation of the patterned Ti foils in ethylene glycol solution. The schematic diagram of the anodic oxidation system is shown in Figure 1.Figure 1

Bottom Line: The resulting conical island structures were anodized in ethylene glycol solution containing 0.25 wt% NH4F and 2 vol% H2O, and conical islands composed of TiO2 nanotubes were successfully formed on the Ti foils.The conical island structure was very effective at improving performances of DSCs based on TiO2 nanotubes.DSCs based on the conical islands of TiO2 nanotube arrays have the potential to achieve higher efficiency levels compared to DSCs based on normal TiO2 nanotubes and TiO2 nanoparticles because the conical islands of TiO2 nanotube arrays enlarge the surface area for dye adsorption.

View Article: PubMed Central - PubMed

Affiliation: Department of Metal and Materials Engineering, Gangneung-wonju National University, Gangneung, 210-720 South Korea.

ABSTRACT
Ti conical island structures were fabricated using photolithography and the reactive ion etching method. The resulting conical island structures were anodized in ethylene glycol solution containing 0.25 wt% NH4F and 2 vol% H2O, and conical islands composed of TiO2 nanotubes were successfully formed on the Ti foils. The conical islands composed of TiO2 nanotubes were employed in photoelectrodes for dye-sensitized solar cells (DSCs). DSC photoelectrodes based on planar Ti structures covered with TiO2 nanotubes were also fabricated as a reference. The short-circuit current (J sc) and efficiency of DSCs based on the conical island structures were higher than those of the reference samples. The efficiency of DSCs based on the conical island structures reached up to 1.866%. From electrochemical impedance spectroscopy and open-circuit voltage (V oc) decay measurements, DSCs based on the conical island structures exhibited a lower charge transfer resistance at the counter cathode and a longer electron lifetime at the interface of the photoelectrode and electrolyte compared to the reference samples. The conical island structure was very effective at improving performances of DSCs based on TiO2 nanotubes. Graphical AbstractConical islands of TiO2 nanotube arrays are fabricated by an anodizing process with Ti protruding dots which have a conical shape. The conical islands are applied for use in DSC photoelectrodes. DSCs based on the conical islands of TiO2 nanotube arrays have the potential to achieve higher efficiency levels compared to DSCs based on normal TiO2 nanotubes and TiO2 nanoparticles because the conical islands of TiO2 nanotube arrays enlarge the surface area for dye adsorption.

No MeSH data available.


Related in: MedlinePlus