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首页> 外文会议>Carbon Nanostructures 4 - Fullerenes to Graphene >Hydrogen-carbon Bond on the Nanostructured Graphite for Hydrogen Sensor
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Hydrogen-carbon Bond on the Nanostructured Graphite for Hydrogen Sensor

机译：氢传感器纳米结构石墨上的氢碳键

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There is a need to understand the hydrogen sorption mechanism(s). In this work, hydrogenated graphite samples were characterized by TGA-Mass Spectrometry, Raman spectros-copy and high resolution TEM. It was found that graphite milled for various times (0-40 h) had different d-spacings and CHx (x≤3) ratios. Graphite milled up to 10 h that was subsequently heated (under argon to 990 ℃) desorbed only hydrogen, while above 10 h the amount of desorbed hydrogen decreased and an increasing amount of methane was also evolved. The 10 h sample had no measurable sp3 bonding, and desorbed 5.5 wt% hydrogen when heated. While the 40 h sample had a d-spacing of 0.48 nm, both sp~2 and sp~3 bonding, and desorbed 5.1 wt% pure hydrogen. The mechanism of graphite hydrogenation is discussed in terms of hydrogen atoms being predominately trapped at the graphite edges, rather than between graphene layers.
机译：需要了解氢吸附机理。在这项工作中，氢化石墨样品通过TGA-质谱，拉曼光谱和高分辨率TEM进行了表征。发现在不同时间（0-40小时）研磨的石墨具有不同的d间距和CHx（x≤3）比。研磨至10 h的石墨随后被加热（在氩气下至990℃）仅脱氢，而10 h以上则脱氢的氢数量减少，甲烷的生成量也增加。 10 h样品没有可测量的sp3键，加热时解吸了5.5 wt％的氢。尽管40 h样品的d间距为0.48 nm，但sp〜2和sp〜3均键合，并脱附了5.1 wt％的纯氢。讨论了石墨氢化的机理，主要是将氢原子捕获在石墨边缘而不是石墨烯层之间。

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