کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1417578 985973 2009 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hydrogen adsorption on nitrogen-doped carbon xerogels
موضوعات مرتبط
مهندسی و علوم پایه مهندسی انرژی انرژی (عمومی)
پیش نمایش صفحه اول مقاله
Hydrogen adsorption on nitrogen-doped carbon xerogels
چکیده انگلیسی

Nitrogen-doped (1.2–4.5 wt%) carbon xerogels were synthesized from carbonization of resorcinol-formaldehyde polymer in an ammonia atmosphere at various temperatures. The textural properties and the chemical nature of nitrogen in the nitrogen-doped carbon xerogels were analyzed by Ar adsorption/desorption isotherms and X-ray photoelectron spectroscopy, respectively. The maximum hydrogen uptakes were measured to be 3.2 wt% at −196 °C and 0.28 wt% at 35 °C. Hydrogen adsorption had a stronger correlation with specific surface area than nitrogen content at the low temperature of −196 °C. At the higher temperature of 35 °C, optimal nitrogen doping enhanced hydrogen adsorption by electronic modification of carbon in agreement with previous theoretical predictions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 47, Issue 4, April 2009, Pages 1171–1180
نویسندگان
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