Porous carbon materials have been considered a kind of promising materials for supercapacitors due to high specific surface area and excellent electronic conductivity. Soluble portions (SPs) acquired from thermal dissolution of carbon-based raw materials have been used as the carbon source for hierarchical porous carbons (HPC). In this work, mixtures of rice straw and coal at different mass ratios were selected as the raw materials for co-thermal dissolution to obtain SP. The variation of soluble proportions and subsequent impacts on the electrochemical properties of HPC were investigated. During thermal dissolution, the addition of rice straw increased the content of nitrogen-containing compounds in SP. Therefore, the specific capacitance of HPC is 355 F/g. The specific capacitance of activated carbon material without rice straw is only 299 F/g. The relationship between the molecular characteristics of carbon source and the performance of supercapacitors has been determined. In addition to oxygen-containing compounds, the presence of nitrogen-containing compounds can also lead to a higher electrochemical property for porous carbon materials.

中文翻译：

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煤和生物质热溶解制备高性能超级电容器用多孔碳

多孔碳材料由于高比表面积和优异的电子导电性而被认为是一种有前途的超级电容器材料。通过碳基原材料的热溶解获得的可溶部分（SP）已被用作分级多孔碳（HPC）的碳源。本工作选取不同质量比的稻草与煤的混合物为原料，进行共热溶解制备SP。研究了可溶比例的变化以及对 HPC 电化学性能的影响。在热溶解过程中，稻草的添加增加了SP中含氮化合物的含量。因此，HPC的比电容为355 F/g。不含稻草的活性炭材料的比电容仅为299 F/g。确定了碳源分子特性与超级电容器性能之间的关系。除了含氧化合物外，含氮化合物的存在也可以使多孔碳材料具有更高的电化学性能。