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Conductivity enhancement of CO_2 activated high surface area carbon aerogel using high temperature treatment

机译：使用高温处理的CO_2活性高表面积碳气凝胶的电导率提高

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High specific surface area carbon aerogels are being studied for various electrochemical applications. Their utility in these applications is limited due to moderate electrical conductivity. The current manuscript briefs about the effect of high temperature (HT) treatment (-1400°C) on the conductivity and surface properties of resorcinol-formaldehyde (R-F) based carbon aerogels. Aqueous medium based carbon aerogel with high specific surface area (1796 m~2/g) was synthesized by R-F gelation, ambient drying followed by CO_2 activation treatment. The samples of carbon aerogel with HT treatment (CA-HT) were characterized for textural properties, conductivity, X-ray diffraction and specific capacitance. The specific surface area of CA-HT (1742 m~2/g) showed only marginal decrease after HT treatment mainly due to partial collapse of micropores. The bulk electrical conductivity of CA-HT showed ～35% improvement over the untreated CA with respective values of 165 S/m and 115 S/m. The specific capacitance for both CA and CA-HT were evaluated nearly ～112 F/g at scan rate of 10 mV/s. For higher scan rate 100 mV/s, the CA showed drastic decrease in specific capacitance to 74 F/g, however, for CA-HT the value decreased only to 92 F/g. Equivalent series resistance (ESR), a crucial electrochemical parameter, improved to 0.5 n after HT treatment. The higher specific capacitance at faster scan rates and lower ESR for CA-HT is attributed to improvement in bulk conductivity which makes it a better choice for supercapacitor application.
机译：正在研究高比表面积碳气凝胶，用于各种电化学应用。它们在这些应用中的实用性由于中等电导率而受到限制。目前的稿件关于高温（HT）处理（-1400°C）对甲醛（R-F）碳气凝胶的电导率和表面性能的影响。通过R-F凝胶化合成具有高比表面积（1796m〜2 / g）的含水介质碳气凝胶，随后通过CO_2活化处理，环境干燥。具有HT治疗（CA-HT）的碳气凝胶的样品用于纹理性质，电导率，X射线衍射和特定电容。 Ca-HT（1742m〜2 / g）的比表面积仅在HT治疗后仅由于微孔部分塌陷而下降。 CA-HT的大量电导率显示出在未处理的Ca上改善〜35％，相应的值为165 s / m和115 s / m。在10mV / s的扫描速率下评估Ca和Ca-HT的比电容。对于较高的扫描速率100mV / s，CA显示出特定电容的急剧下降至74f / g，但对于CA-HT，该值仅降低至92 f / g。等效串联电阻（ESR），一个关键的电化学参数，在HT处理后改善为0.5n。对于CA-HT的更快扫描速率和更低的ESR处的较高的特定电容归因于散装电导率的提高，这使得超级电容器应用更好。

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