물분해용 Fe2O3 / Na2Ti6O13 / FTO 박막 제조 및 특성평가
Fabrication and (Photo)Electrochemical Properties of Fe2O3 / Na2Ti6O13 / FTO Films for Water Splitting Process
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One dimensional(1D) Na2Ti6O13 nanorods with 70 nm in diameter was synthesized by a molten salt method. Using the synthesized nanorods, about 750 nm thick Na2Ti6O13 film was coated on Fluorine-doped tin oxide(FTO)glasss substrate by the Layer-by-layer self-assembly(LBL-SA) method in which a repetitive self-assembling of ions containing an opposite electric charge in an aqueous solution was utilized. Using the Kubelka-Munk function, the band gap energy of the 1D-Na2Ti6O13 nanorods was nalyzed to be 3.5eV. On the other hand, the band gap energy of the Na2Ti6O13 film coated on FTO was found to be a reduced value of 2.9 eV, resulting from the nano-scale and high porosity of the film processed by LBL-SA method,which was favorable for the photo absorption capability. A significant improvement of photocurrent and onset voltage was observed with the Na2Ti6O13 film incorporated into the conventional Fe2O3 photoelectrode: the photocurrent increased from 0.25 to 0.82 mA/cm2, the onset voltage decreased from 0.95 to 0.78 V.
Abstract
One dimensional(1D) Na2Ti6O13 nanorods with 70 nm in diameter was synthesized by a molten salt method. Using the synthesized nanorods, about 750 nm thick Na2Ti6O13 film was coated on Fluorine-doped tin oxide(FTO)glasss substrate by the Layer-by-layer self-assembly(LBL-SA) method in which a repetitive self-assembling of ions containing an opposite electric charge in an aqueous solution was utilized. Using the Kubelka-Munk function, the band gap energy of the 1D-Na2Ti6O13 nanorods was nalyzed to be 3.5eV. On the other hand, the band gap energy of the Na2Ti6O13 film coated on FTO was found to be a reduced value of 2.9 eV, resulting from the nano-scale and high porosity of the film processed by LBL-SA method,which was favorable for the photo absorption capability. A significant improvement of photocurrent and onset voltage was observed with the Na2Ti6O13 film incorporated into the conventional Fe2O3 photoelectrode: the photocurrent increased from 0.25 to 0.82 mA/cm2, the onset voltage decreased from 0.95 to 0.78 V.
참고문헌 (9)
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