Understanding the chemical structure of carbon edge sites by using deuterium-labeled temperature-programmed desorption technique
Understanding the chemical structure of carbon edge sites by using deuterium-labeled temperature-programmed desorption technique
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DOI：
10.1016/j.carbon.2020.01.079
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发表时间：
2020-05-01
期刊：
影响因子：
10.9
通讯作者：
Ozaki, Jun-ichi
中科院分区：
文献类型：
--
作者：
Ishii, Takafumi;Ozaki, Jun-ichi
发展了一种氘标记程序升温脱附（TPD）技术，用于准确表征碳基材料表面的官能团。氘取代活性炭上的质子氢后，TPD分析显示氘化合物（D2 O，DHO，D-2，DH）脱附。根据这些氘化合物的预测脱附机制估计了官能团，可以根据官能团及其周围的化学结构进行区分。因此，这项技术不仅提供了官能团类型的信息，还提供了它们周围广泛的化学结构的信息。对活性炭表面形成的酚基、醚基和边氢分别进行了定量分析，并根据其附近的化学结构将活性炭表面形成的官能团分为12类。与红外光谱的比较表明，氘标记的TPD给出了定性合理的结果。该技术有助于更深入地了解碳基材料的表面化学结构。(C)2020爱思唯尔有限公司保留所有权利。
A deuterium-labeled temperature-programmed desorption (TPD) technique was developed to accurately characterize functional groups on the surface of carbon-based materials. After the protic hydrogen of the functional groups on activated carbons was substituted by deuterium, TPD analysis revealed the desorption of deuterium compounds (D2O, DHO, D-2, DH). The functional groups were estimated from the predicted desorption mechanisms of these deuterium compounds, which can be distinguished according to the functional groups and their surrounding chemical structures. Thus, this technique provides information on not only the type of functional groups but also the extensive chemical structure around them. The phenolic group, ether, and edge hydrogen formed on the activated carbons were separately quantified, and the functional groups were further classified into 12 types by the nearby chemical structures. Comparison with IR spectra indicated that the deuterium-labeled TPD gave qualitatively reasonable results. This technique is useful for obtaining a deeper understanding of the surface chemical structure of carbon-based materials. (C) 2020 Elsevier Ltd. All rights reserved.