کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
6457468 1361709 2017 5 صفحه PDF سفارش دهید دانلود کنید
عنوان انگلیسی مقاله
Spectral hemispherical reflectivity of nonstoichiometric cerium dioxide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Spectral hemispherical reflectivity of nonstoichiometric cerium dioxide
چکیده انگلیسی


- Spectral hemispherical reflectivity measured for CeO2−δ, with δ in the range 0-0.0377.
- Spectroscopic measurements covered the wavelength range 300-2800 nm.
- Sample with interconnected μm-sized pores shows similar selectivity.
- Empirical correlation derived for the total hemispherical reflectivity.

Nonstoichiometric ceria, CeO2-δ, has emerged as a promising redox material for thermochemically splitting H2O and CO2 using concentrated solar energy. Knowledge of its radiative properties is crucial for the design of efficient solar reactors. Samples of various nonstoichiometries (0≤δ≤0.0377) were prepared by thermal reduction in a thermogravimetric analyzer at high temperatures (T≥1473 K) and under low oxygen partial pressures (pO2≤2.5·10−4 atm). The spectral hemispherical reflectivity was measured using a spectroscopic goniometry system in the spectral range 300-2800 nm. A porous ceria sample with interconnected µm-sized pores showed comparable selectivity because of its high optical thickness. The total hemispherical reflectivity was computed for emission temperatures in the range 900-6000 K relevant to solar reactors.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solar Energy Materials and Solar Cells - Volume 159, January 2017, Pages 167-171
نویسندگان
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