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Impact of nitrogen functionalization and porosity on the electrosorption of Ionic Liquids on templated porous carbons
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.electacta.2025.145751
Zehui Guo, Marius Hermesdorf, Yongchao Chen, Ping Feng, Yan Lu, Martin Oschatz, Desirée Leistenschneider

This study systematically investigates the influence of nitrogen functionalities and content in nitrogen-rich carbon materials, specifically carbon/carbon nitride nanohybrids, on their performance as electrode materials in electric double-layer capacitors operated with ionic liquid electrolyte (1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide). The loading amounts of cyanamide as carbon nitride precursor as well as the condensation temperature are varied over a wide range to obtain materials with significantly different porosity, nitrogen contents, and chemical nitrogen species. Thermogravimetric analysis, combustion elemental analysis, gas physisorption, and X-ray photoelectron spectroscopy measurements show that the nitrogen loss from carbon nitride starts to become significant between 500 and 600°C and that different nitrogen species are created shifting from more pyridinic forms to graphitic and oxidized nitrogen. For the EDLC application, it is found that the mass-specific capacitance is dictated by the specific surface area whereas the capacitance normalized to the specific surface area determined by gas physisorption can be slightly enhanced by the presence of pyridinic nitrogen species. In addition, lowering of the total pore volume leads to higher areal active material loadings and lower dead volume which needs to be filled with electrolyte.

中文翻译:


氮功能化和孔隙率对离子液体在模板多孔碳上电吸附的影响



本研究系统研究了富氮碳材料(特别是碳/氮化碳纳米杂化物)中氮的功能和含量对它们在离子液体电解质(1-乙基-3-甲基咪唑鎓双(三氟甲基磺酰基)酰亚胺)工作中的双电层电容器中作为电极材料的性能的影响。氰胺作为氮化碳前驱体的负载量以及缩合温度在很宽的范围内变化,以获得孔隙率、氮含量和化学氮种类明显不同的材料。热重分析、燃烧元素分析、气体物理吸附和 X 射线光电子能谱测量表明,氮化碳产生的氮损失在 500°C 至 600°C 之间开始变得显着,并且会产生不同的氮种类,从更多的吡啶形式转变为石墨和氧化氮。对于 EDLC 应用,发现质量比电容由比表面积决定,而归一化为由气体物理吸附确定的比表面积的电容可以通过吡啶氮的存在而略微增强。此外,降低总孔体积会导致更高的区域活性材料负载和更低的死体积,这需要填充电解质。
更新日期:2025-01-24
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