کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
185964 459605 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Highly photoactive Ti-doped α-Fe2O3 nanorod arrays photoanode prepared by a hydrothermal method for photoelectrochemical water splitting
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Highly photoactive Ti-doped α-Fe2O3 nanorod arrays photoanode prepared by a hydrothermal method for photoelectrochemical water splitting
چکیده انگلیسی


• Ti-doped α-Fe2O3 nanorod arrays were prepared by hydrothermal method.
• The effect of Ti ions on Ti-doped α-Fe2O3 was studied by electrochemistry techniques.
• Ti-doped α-Fe2O3 exhibits a photocurrent density of 0.72 mA/cm2 at 0.23 V vs. Ag/AgCl.

In this work, we report the Ti-doped α-Fe2O3 nanorod arrays prepared by a facile approach as well as their implementation as photoanodes for photoelectrochemical water splitting. Impedance measurements show that the Ti dopant serves as electron donor and increases the donor density of Ti-doped α-Fe2O3 nanorod arrays to 2.4 × 1019 cm−3, which is approximately 4 times higher than that of undoped α-Fe2O3 nanorod arrays. Photoelectrochemical impedance spectroscopy shows that photogenerated holes could be transferred from valence band of hematite to electrolyte more efficiently in Ti-doped α-Fe2O3 nanorod arrays. With the optimal Ti/Fe atomic ratio, Ti-doped α-Fe2O3 nanorod arrays exhibit a remarkable photocurrent density of 0.72 mA/cm2 at 0.23 V vs. Ag/AgCl, which is 2 order of magnitude higher than that of undoped α-Fe2O3 nanorod arrays. The enhancive photoelectrochemical activity of Ti-doped α-Fe2O3 nanorod arrays is attributed to the improved donor density and reduced recombination of the electron-hole pairs.

Ti-doped α-Fe2O3 nanorod arrays were prepared for photoelectrochemical water splitting by a facile hydrothermal method. With the optimal Ti/Fe atomic ratio, the Ti-doped α-Fe2O3 nanorod arrays show a remarkable photocurrent density, which is 2 order of magnitude higher than that of undoped α-Fe2O3 nanorod arrays.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 129, 20 May 2014, Pages 358–363
نویسندگان
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