کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7935286 | 1513052 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Hydrogen production under visible illumination on the spinel NiMn2O4 prepared by sol gel
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی های تجدید پذیر، توسعه پایدار و محیط زیست
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چکیده انگلیسی
The spinel NiMn2O4 prepared by sol-gel is applied for the hydrogen liberation upon visible light. The oxide crystallizes in a cubic symmetry with a crystallite dimension of 63â¯nm, smaller than that obtained by transmission electron microscopy (TEM; 470â¯nm), indicating crystallites agglomeration. p-type conductivity is demonstrated by the positive thermo power (+130â¯ÂµV at 300â¯K), with a hole mobility of 2.09â¯Ãâ¯10â4â¯cm2â¯Vâ1â¯sâ1 and an activation energies of 70â¯meV. The optical gap (1.13â¯eV), attributed to 3d orbital splitting, is determined from the diffuse reflectance and is appropriately matched to the sun spectrum. The physical and chemical characterizations are correlated to show the feasibility of NiMn2O4 for the hydrogen formation. The capacitance measurement gives a flat band potential of â0.20 VSCE and a hole density of 0.29â¯Ãâ¯1016â¯cmâ3. The potential of the conduction band (â1.26 VSCE) is below that of H2O/H2 level (â¼â0.40 VSCE), allowing H2-liberation upon visible irradiation. The NiMn2O4 mass, pH and concentration of the hole scavenger S2O32â are optimized. Under optimized conditions, the H2volume liberation reaches 77â¯Âµmol with rate of 0.024â¯Âµmolâ¯mgâ1â¯minâ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy - Volume 166, 15 May 2018, Pages 220-225
Journal: Solar Energy - Volume 166, 15 May 2018, Pages 220-225
نویسندگان
G. Rekhila, Y. Gabes, Y. Bessekhouad, M. Trari,