کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5376320 | 1504319 | 2007 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Surface grooved visible light active carbon modified (CM)-n-TiO2 thin films for efficient photoelectrochemical splitting of water
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Carbon modified n-type titanium oxide (CM-n-TiO2) photoelectrodes were synthesized by thermal flame oxidation of grooved and non-grooved Ti metal sheet at several flame temperatures for different lengths of time. The photoresponse of CM-n-TiO2 was evaluated by measuring the rate of water splitting to hydrogen and oxygen, which is proportional to observed photocurrent density. The optimized grooved CM-n-TiO2 photoelectrodes generated photocurrent density of 11.45Â mAÂ cmâ2 at applied potential of 0.242Â V at illumination intensity of 100Â mWÂ cmâ2 from a 150Â W xenon lamp. However, under the same illumination condition the non-grooved sample generated photocurrent density of 9.17Â mAÂ cmâ2 at applied potential of 0.24Â V. The maximum photoconversion efficiencies obtained from wavelength dependent monochromatic photocurrents were found to be 11.16% and 8.86% for grooved and non-grooved samples, respectively, under the same illumination intensity from the xenon lamp. Importantly, for optimized grooved CM-n-TiO2 sample, at an applied potential of 0.242Â V the total conversion efficiency of 9.5% and the maximum photoconversion efficiency of 7.62% for water splitting under global air mass of 1.5 (AM 1.5) sunlight (1 sun) illuminations were observed. The carbon contents in optimized grooved and non-grooved CM-n-TiO2 samples were found to be 19.38Â at.% and 17.60Â at.%, respectively, from energy dispersive analysis by X-ray (EDAX) though both samples showed same band gap energy of 2.65Â eV and a mid-gap band of 1.4Â eV above the valence band. The UV-Vis spectra, X-ray diffraction (XRD) spectra and scanning electron micrograms (SEM) of these samples were also given.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Physics - Volume 339, Issues 1â3, 15 October 2007, Pages 73-85
Journal: Chemical Physics - Volume 339, Issues 1â3, 15 October 2007, Pages 73-85
نویسندگان
Yasser A. Shaban, Shahed U.M. Khan,