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首页> 外文期刊>RSC Advances >Enhancing capacitance of supercapacitor with both organic electrolyte and ionic liquid electrolyte on a biomass-derived carbon
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Enhancing capacitance of supercapacitor with both organic electrolyte and ionic liquid electrolyte on a biomass-derived carbon

机译：在生物质来源的碳上同时使用有机电解质和离子液体电解质增强超级电容器的电容

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Supercapacitor (SC) with organic electrolyte or ionic liquid (IL) electrolyte can generally store/release higher energy than that with an aqueous electrolyte, due to a larger operating voltage window of a non-aqueous electrolytes. A carbon is synthesized by a facile impregnate-activation method from renewable woody biomass, which has twice of the specific surface area and pore volume than the sample synthesized by conventional KOH activation. Biomass-derived carbons with high ion accessible surface area and highly integrated micropores and mesopores provide superior capacitance, excellent rate capability and good stability in both organic electrolyte and IL electrolytes. Significant enhancement in the capacitance and rate capability were obtained by the generation of micropores similar to the ion size and better pore network through removal of impurities in the biomass. High specific capacitances of 146 F g?1 in the organic electrolyte and 224 F g?1 in the IL electrolyte at current density of 0.1 A g?1 are achieved. Highly integrated micro- and mesoporous structure leads to a good rate capability of 100% capacitance retention at current density up to 10 A g?1 in the organic electrolyte and 67% capacitance retention at current density up to 7 A g?1 in the IL. With the large voltage offered by the non-aqueous electrolyte, the material can store/release high maximum energy of 26 W h kg?1 and 92 W h kg?1 in the organic electrolyte and IL electrolyte, respectively. It reveals that the biomass derived carbon is a promising and cost effective candidate for electrodes in high performance SCs.
机译：由于非水电解质的工作电压窗口较大，因此具有有机电解质或离子液体（IL）电解质的超级电容器（SC）通常可以存储/释放比具有水性电解质的超级电容器更高的能量。碳是通过一种容易的浸渍活化方法由可再生的木质生物质合成的，其比表面积和孔体积是通过常规KOH活化合成的样品的两倍。具有高离子可及表面积和高度集成的微孔和中孔的生物质碳在有机电解质和IL电解质中均具有出色的电容，出色的倍率能力和良好的稳定性。通过产生与离子大小相似的微孔以及通过去除生物质中的杂质获得更好的孔网络，可以显着提高电容和速率能力。高比电容在有机电解质中为146 F g ？1 在IL中为224 F g ？1 获得了电流密度为0.1 A g ？1 的电解液。高度集成的微孔和中孔结构导致良好的倍率能力，在有机电解质中电流密度高达10 A g ？1 时电容保持率达100％，电容率达67％ IL中电流密度高达7 A g ？1 时的保持力。在非水电解质提供的高电压下，该材料可以存储/释放高达26 W h kg ？1 和92 W h kg 的高最大能量。 ？1 分别在有机电解质和IL电解质中。它揭示了生物质衍生的碳是高性能SC中电极的一种有前途且具有成本效益的候选材料。

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