کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9761555 1498419 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Direct operation of solid oxide fuel cells with methane fuel
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Direct operation of solid oxide fuel cells with methane fuel
چکیده انگلیسی
The operation of Ni-YSZ anode supported SOFCs on methane fuel is described. Power densities as high as 0.52 W/cm2 at 700 °C and 1.27 W/cm2 at 800 °C were observed. Open circuit voltages (OCV) increased with increasing temperature to nearly 1.2 V, in good agreement with equilibrium calculations. Measurements of direct-methane SOFC stability showed that at lower temperatures, ≤ 700 °C, stable operation without coking occurred over a wide range of current densities. At higher temperatures, increasingly large currents were required to avoid coking and cell failure. In electrochemical impedance spectra, two electrode arcs were observed with the higher frequency arc increasing in size when the fuel was switched from hydrogen to methane. Mass spectrometer measurements showed that the expected reaction products-H2, H2O, CO, and CO2-all increased with increasing cell current density. The dominant products at 800 °C were H2 and CO, in agreement with thermodynamic predictions. Reasons for stable coke-free direct methane operation are discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 23–24, July 2005, Pages 1827-1835
نویسندگان
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