کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7720882 | 1497506 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Chemisorption, physisorption and hysteresis during hydrogen storage in carbon nanotubes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Chemisorption, physisorption and hysteresis during hydrogen storage in carbon nanotubes Chemisorption, physisorption and hysteresis during hydrogen storage in carbon nanotubes](/preview/png/7720882.png)
چکیده انگلیسی
The question of chemisorption versus physisorption during hydrogen storage in carbon nanotubes (CNTs) is addressed experimentally. We utilize a powerful measurement technique based on a magnetic suspension balance coupled with a residual gas analyzer, and report new data for hydrogen sorption at pressures of up to 100 bar at 25 °C. The measured sorption capacity is less than 0.2 wt.%, and there is hysteresis in the sorption isotherms when multi-walled CNTs are exposed to hydrogen after pretreatment at elevated temperatures. The cause of the hysteresis is then studied, and is shown to be due to a combination of weak sorption - physisorption - and strong sorption - chemisorption - in the CNTs. Analysis of the experimental data enables us to calculate separately the individual hydrogen physisorption and chemisorption isotherms in CNTs that, to our knowledge, are reported for the first time here. The maximum measured hydrogen physisorption and chemisorption are 0.13 wt.% and 0.058 wt.%, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 3, 16 January 2014, Pages 1390-1397
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 3, 16 January 2014, Pages 1390-1397
نویسندگان
Seyed Hamed Barghi, Theodore T. Tsotsis, Muhammad Sahimi,