Influence of sample cell physisorption on measurements of hydrogen storage of carbon materials using a Sieverts apparatus

被引：18

作者：

Chen, Yuanzhen ^{[1
]}

Liu, Qing ^{[1
]}

Yan, Yisheng ^{[1
]}

Cheng, Xiaohua ^{[1
]}

Liu, Yongning ^{[1
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

来源：

CARBON | 2010年 / 48卷 / 03期

关键词：

GRAPHITE NANOFIBERS; ROOM-TEMPERATURE; BWR EQUATION; NANOTUBES; CAPACITY; NANOSTRUCTURES; ADSORPTION; PRESSURE;

D O I：

10.1016/j.carbon.2009.10.016

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In recent years, large fluctuations have been reported for measurements of the hydrogen storage of carbon materials using a Sieverts apparatus. To investigate this problem, helium gas adsorption was selected for comparison with the adsorption of hydrogen, and the results show that hydrogen but not helium was adsorbed onto the wall of the sample cell at ambient temperature. The adsorption capacity of the sample cell at 77 K is higher than that at ambient temperature. A series of adsorption tests was conducted with a LaNi5 alloy to prove the influence of the physisorption, and the results show that an increase in the hydrogen storage capacity was resulted in when sample loading decreases. After correction for this hydrogen physisorption, the capacity was restricted between 1.38 and 1.41 wt.%. Multi-walled carbon nanotubes (MWCNTs), activated carbon (AC), single-walled carbon nanotubes (SWCNTs), graphite nanofibers (GNFs), and graphite oxide (GO) were also measured and corrected through this method. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：714 / 720

页数：7

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