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Clarification of Gas Adsorption Properties of Carbon Nanotubes and Their Application to Hydrogen Storage

碳纳米管气体吸附性能的阐明及其在储氢中的应用

基本信息

批准号：
13450022
负责人：
SAITO Yahachi
金额：
$ 4.29万
依托单位：
Mie University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-13450022/
关键词：
Carbon nanotube Single-wall nanotube Gas adsorption Hydrogen storage Adsorption isotherm Gravimetric method Volumetric method Thermal desorption 吸着等温泉脱離スペクトル

项目摘要

Gas adsorption properties of carbon soot containing single-wall carbon nanotubes (SWNTs) with different diameters and different concentrations were investigated by adsorption isotherms and thermal desorption mass spectrometry. Followings are the main achievement of the present study.1. Preparation of SWNTs with different diametersSWNTs were produced by carbon arc discharge in helium gas. Average diameter of SWNTs, ranging from 1.2 nm to 2.3 nm, was controlled by the concentration of sulfur additives. Yield of SWNTs in the raw product (soot) decreased from 20% to 1% with the increase of diameters.2. Isotherms of nitrogen and hydrogen measured by volumetric methodNitrogen and hydrogen isotherms of raw SWNT samples were measured in a pressure range from 0 to 400 Pa. The specific surface area of micropores changed from 90 to 53 m^2/g with the decrease of SWNT concentration in the raw soot, but the outer surface area did not change appreciably. The hydrogen uptake (0.56 to 0.50 wt%) seemingly depends on the micropore surface area, but the dependence was not prominent.3. Isotherm of hydrogen measured by gravimetric methodHydrogen isotherm of SWNTs with average diameter of 1.28 nm was measured at pressures less than 50 Torr. Hydrogen uptake at 77 K was 2.7 wt% for SWNTs with closed caps and 5 wt% for of SWNTs with broken caps. At room temperature, these values decreased to 0.3 wt% and 0.7 wt%, respectively.4. Thermal desorption mass spectrometryAfter exposing raw SWNT samples to hydrogen at 140K for 10 min, thermal desorption of hydrogen from the samples was measured at a rate of 4℃/min. A desorption peak was observed at 170 K. No desorption peak around 290 K, which was reported previously, was not observed.

采用吸附等温线和热脱附质谱研究了不同直径和不同浓度的单壁碳纳米管（SWNTs）对碳烟气体的吸附性能。本研究的主要成果如下：1.不同直径单壁碳纳米管的制备采用碳弧放电法在氦气中制备了单壁碳纳米管.单壁碳纳米管的平均直径，从1.2 nm到2.3 nm，由硫添加剂的浓度控制。单壁碳纳米管在粗产物（烟灰）中的产率随着直径的增加从20%下降到1%.在0 ~ 400 Pa的压力范围内测定了单壁碳纳米管原料样品的氮、氢等温线。随着碳烟中单壁碳纳米管浓度的降低，碳烟中微孔的比表面积从90 m^2/g变化到53 m^2/g，但外表面积变化不大。吸氢量（0.56 ~ 0.50wt%）似乎取决于催化剂的表面积，但这种依赖性并不明显.重量法测得的氢气等温线在小于50 Torr的压力下测量了平均直径为1.28 nm的单壁碳纳米管的氢气等温线。氢吸收在77 K是2.7重量%的单壁碳纳米管与封闭的帽和5重量%的单壁碳纳米管与破帽。在室温下，这些值分别降低到0.3wt%和0.7wt%。热脱附质谱在140 K下暴露10 min后，以4℃/min的速率测量样品的热脱附量，在170 K下观察到一个脱附峰。未观察到先前报道的290 K附近的解吸峰。