Hydrogen desorption property of mechanically prepared nanostructured graphite
Hydrogen desorption property of mechanically prepared nanostructured graphite
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DOI：
10.1063/1.1385362
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发表时间：
2001-08-01
影响因子：
3.2
通讯作者：
Majer, G
中科院分区：
文献类型：
--
作者：
Orimo, S;Matsushima, T;Majer, G
在氢气气氛下机械球磨80 h的纳米结构石墨的热脱附质谱中观察到氢分子（质量数=2）的两个脱附峰，分别在约600和950 K处开始。从热解吸质谱和热重分析的组合分析得出，在第一解吸峰处，近似6质量%的氢（对应于氢总量的80%）作为纯氢和烃的混合物被解吸。在第二解吸峰的温度以下，在该温度下发生与再结晶相关的解吸，纳米结构化石墨预计将保留其特定的缺陷结构，主要具有作为用于储氢的合适捕获位点的碳悬挂键。根据拉曼光谱的轮廓，讨论了氢气氛下球磨过程中纳米结构的形成过程。(C)2001年美国物理学会。
Two desorption peaks of hydrogen molecule (mass number=2), starting at about 600 and 950 K, respectively, are observed in thermal desorption mass spectroscopy of nanostructured graphite mechanically milled for 80 h under hydrogen atmosphere. It follows from a combined analysis of thermal desorption mass spectroscopy and thermogravimetry, that similar to6 mass % of hydrogen (corresponding to 80% of the total amount of hydrogen) is desorbed at the first desorption peak as a mixture of pure hydrogen and hydrocarbons. Below the temperature of the second desorption peak, at which recrystallization related desorption occurs, nanostructured graphite is expected to retain its specific defective structures mainly with carbon dangling bonds as suitable trapping sites for hydrogen storage. The formation process of the nanostructures during milling under hydrogen atmosphere is also discussed on the basis of the profile of Raman spectroscopy. (C) 2001 American Institute of Physics.