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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >NMR studies of hydrogen motion in nanostructured hydrogen-graphite systems
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NMR studies of hydrogen motion in nanostructured hydrogen-graphite systems

机译：纳米氢石墨系统中氢运动的NMR研究

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摘要

Nanostructured hydrogen-graphite systems, C~(nano)H_x (x = 0.24, 0.31, 0.96), have been characterized by first nuclear magnetic resonance (NMR) measurements. The NMR spectrum of C~(nano)H_(0.96) is well represented by the sum of a Lorentzian and a Gaussian line, indicating two types of hydrogen coordinations, These two components may be ascribed to hydrogen in graphite interlayers and hydrogen chemisorbed at dangling bonds. Information on the hydrogen hopping frequencies is provided by the spin-lattice relaxation rate GAMMA_1. The temperature dependence of GAMMA_1 yields high hydrogen diffusivities and low activation energies of E_a approx= 0.1 eV A change in the GAMMA_1 data of C~(nano)H_x with x = 0.24 and 0.31 occurred after the samples had been heated to about 400-430 K. This suggests that in this temperature range hydrogen atoms start to occupy sites with different site energies, resulting in a distribution of the activation energies for hydrogen motion.
机译：纳米结构的氢-石墨系统C〜（nano）H_x（x = 0.24，0.31，0.96）已通过首次核磁共振（NMR）测量进行了表征。 C〜（n）H_（0.96）的NMR谱图由洛伦兹线和高斯线的总和很好地表示，表示两种类型的氢配位，这两个成分可能归因于石墨夹层中的氢和悬空时化学吸附的氢债券。自旋晶格弛豫率GAMMA_1提供了有关氢跳跃频率的信息。 GAMMA_1的温度依赖性产生较高的氢扩散率，E_a的活化能较低，大约为0.1 eV。样品被加热到约400-430后，C〜（nano）H_x的GAMMA_1数据发生了x = 0.24和0.31的变化。 K。这表明在此温度范围内，氢原子开始占据具有不同位点能量的位点，从而导致氢运动的活化能分布。

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