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High ion adsorption densities of site-selective nitrogen doped carbon sheets prepared from natural lignin

机译：从天然木质素制备的位点选择性氮掺杂碳板的高离子吸附密度

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Carbon fibers and sheets were prepared from jet-milled natural chitin and cellulose samples, and from natural lignin sample using ice-templating technique, respectively. Nitrogen doping treatments using melamine were also performed for the carbon fibers and sheets. Electric double layer capacitor (EDLC) electrode properties of the prepared carbon fibers and sheets including the nitrogen doped samples were investigated with aqueous (sulfuric acid) and organic (tetraethylammonium tetrafluoroborate in propylene carbonate) electrolytes. It was found that the nitrogen doped lignin carbon sheets having very small specific surface area of 66 m(2) g(-1) show very high EDLC capacitances of 227 F g(-1) and 80 F g(-1) determined by charge-discharge measurements at current density of 50 mA g(-1) for aqueous and organic electrolytes, respectively. X-ray photoelectron spectroscopy (XPS) measurements revealed that nitrogen atoms of the nitrogen doped lignin carbon sheets exist dominantly in pyridinic sites unlike other chitin and cellulose carbon fibers. We discussed that this site-selective nitrogen doping gives exceptionally high ion adsorption density per unit surface area of the nitrogen doped lignin carbon sheets.
机译：碳纤维和片材由喷射的天然丁蛋白和纤维素样品制备，并使用冰模板技术从天然木质素样品中制备。还对碳纤维和片材进行了使用三聚氰胺的氮掺杂处理。用水性（硫酸）和有机（碳酸亚丙酯中的四乙基四氟硼酸盐），研究制备的碳纤维和包括氮掺杂样品的片材的电双层电容器（EDLC）电极性质。发现具有非常小的比表面积为66m（2）g（-1）的氮掺杂木质素碳片显示出由227f g（-1）和80 f g（-1）的非常高的EDLC电容。用于水性和有机电解质的电流密度为50mA g（-1）的充电放电测量。 X射线光电子能谱（XPS）测量显示，与其他几丁质和纤维素碳纤维不同，氮掺杂木质素碳板的氮原子呈显着存在于吡啶菌位点。我们讨论了该位点选择性氮掺杂，给出了氮掺杂木质素碳片的每单位表面积的高离子吸附密度。

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    《RSC Advances》 |2019年第72期|共7页
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  • 正文语种 eng
  • 中图分类 化学;
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