New Insights into the Structure of Nanoporous Carbons from NMR, Raman, and Pair Distribution Function Analysis
New Insights into the Structure of Nanoporous Carbons from NMR, Raman, and Pair Distribution Function Analysis
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DOI：
10.1021/acs.chemmater.5b03216
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发表时间：
2015-10
影响因子：
8.6
通讯作者：
Alexander C. Forse;Céline Merlet;P. Allan;E. Humphreys;J. Griffin;M. Aslan;M. Zeiger;V. Presser;Y. Gogotsi;C. Grey
中科院分区：
文献类型：
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作者：
Alexander C. Forse;Céline Merlet;P. Allan;E. Humphreys;J. Griffin;M. Aslan;M. Zeiger;V. Presser;Y. Gogotsi;C. Grey
纳米多孔碳的结构表征是一项具有挑战性的任务，因为它们通常缺乏长程有序并且可以表现出不同的局部结构。这种表征是理解和改善多孔碳的性质和功能的重要一步，然而很少有实验技术为此目的而开发。在这里，我们展示了核磁共振（NMR）光谱和对分布函数（PDF）分析作为探测多孔碳局部结构的新工具的应用，以及更传统的拉曼光谱。pdf和拉曼光谱结合在一起，可以探测到局部化学键，在高温下合成的碳化物衍生碳（cdc）的化学键变得更加有序。核磁共振实验中产生的环电流（以及由此观察到的被吸附物质的核磁共振化学位移）强烈依赖于芳香碳畴的大小。我们利用这个性质，并使用…
The structural characterization of nanoporous carbons is a challenging task as they generally lack long-range order and can exhibit diverse local structures. Such characterization represents an important step toward understanding and improving the properties and functionality of porous carbons, yet few experimental techniques have been developed for this purpose. Here we demonstrate the application of nuclear magnetic resonance (NMR) spectroscopy and pair distribution function (PDF) analysis as new tools to probe the local structures of porous carbons, alongside more conventional Raman spectroscopy. Together, the PDFs and the Raman spectra allow the local chemical bonding to be probed, with the bonding becoming more ordered for carbide-derived carbons (CDCs) synthesized at higher temperatures. The ring currents induced in the NMR experiment (and thus the observed NMR chemical shifts for adsorbed species) are strongly dependent on the size of the aromatic carbon domains. We exploit this property and use co...