کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1275423 1497456 2015 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Chitosan-based highly activated carbons for hydrogen storage
ترجمه فارسی عنوان
ذخایر هیدروژنی برای کیتوزان بسیار فعال شده است
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
چکیده انگلیسی


• Activated carbons with surface area up to 3100 m2 g−1 were prepared from chitosan.
• Pore size distributions determine the H2 storage capacity in the activated carbons.
• Pores of 0.7–1 nm define the H2 adsorption capacity at atmospheric pressure at 77 K.
• The presence of supermicropores enhances H2 adsorption at 4 MPa.
• Hydrogen adsorption capacity of 5.6 wt% at 77 K and 4 MPa was reached.

Highly microporous activated carbons (ACs) were prepared using chitosan, a low cost and abundant biopolysaccharide, as a carbon precursor. Chitosan chars were activated with KOH in different experimental conditions, yielding chitosan-based ACs with high surface areas (922–3066 m2 g−1) and pore volumes (0.40–1.38 cm3 g−1). Microporosity was the main contributor to the total pore volume for all ACs. Chitosan-based ACs were tested as hydrogen storage systems using hydrogen physisorption at atmospheric pressure and 4 MPa. The optimized ACs exhibited excellent hydrogen adsorption capacities at 77 K (2.95 wt% at 0.1 MPa, 5.61 wt% at 4 MPa). Micropores with a width of 0.7–1 nm were mainly responsible for hydrogen adsorption at atmospheric pressure, whereas larger pores did not exert any noticeable influence. Conversely, the presence of supermicropores and small mesopores also enhanced hydrogen uptake at 4 MPa. These results show a high potential for the use of chitosan-based ACs in hydrogen storage systems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 40, Issue 17, 11 May 2015, Pages 5788–5796
نویسندگان
, , ,