通过烃在Ni-Li/SiO₂上分解制备的多壁碳纳米管的储氢性能

Hydrogen storage of multi-walled carbon nanotubes obtained by decomposition of hydrocarbon over Ni-Li/SiO2.

作者信息

Ishihara Tatsumi, Kamimura Mitsuhiro, Yasuda Isamu, Nishiguchi Hiroyasu, Takita Yusaku

机构信息

Department of Applied Chemistry, Faculty of Engineering, Oita University, Dannoharu, Oita, Japan.

出版信息

J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(10):2627-39. doi: 10.1081/ese-200027018.

DOI:10.1081/ese-200027018

PMID:15509013

Abstract

Hydrogen storage into multi-walled carbon nanotubes obtained by the decomposition of hydrocarbons using Ni-Li/SiO2 was investigated. The optimized reaction conditions for the synthesis of carbon nanotubes were 873K and W/F=40 g-cat.h/mol, and carbon nanotubes obtained by C2H6 decomposition were found to exhibit fairly large H2 storage capacity of 1 wt% at room temperature. The storage capacity increased with decreasing temperature and a capacity of 5 wt% was achieved at 77K, with 66% of adsorbed hydrogen being desorbable. Hydrogen adsorption by pi orbital in C-C bond coordination is proposed, observing both weakened Raman adsorption C-C peaks and the thermal release of CH4 after H2 storage.

摘要

研究了使用Ni-Li/SiO₂通过烃类分解获得的多壁碳纳米管中的储氢情况。合成碳纳米管的优化反应条件为873K和W/F = 40 g-cat.h/mol，发现通过C₂H₆分解获得的碳纳米管在室温下表现出相当大的1 wt%的H₂储存容量。储存容量随温度降低而增加，在77K时达到5 wt%的容量，其中66%的吸附氢可解吸。提出了通过C-C键配位中的π轨道进行氢吸附，观察到拉曼吸附C-C峰减弱以及储氢后CH₄的热释放。