Preparation and electrochemical performance of carbon aerogels dried at ambient pressure
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摘要: 以间苯二酚-甲醛为前驱体，通过加入P123以增强有机气骨架的方法，采用常压干燥技术制备碳气凝胶电极材料，有机凝胶在干燥过程中收缩率极大降低。通过二氧化碳活化法对常压干燥获得的碳气凝胶孔结构进行了调控。研究了不同温度对其结构的影响，获得了最高比表面积达3544 m2/g的碳气凝胶。6 mol/L的KOH电解液中测试表明，常压干燥碳气凝胶具有稳定的充放电性能，随着活化温度的升高，比容量逐渐增加，最高比电容可达261 F/g。常压干燥技术制备的碳气凝胶电极材料在降低生产成本的同时，仍具有理想的电化学性能。Abstract: Carbon aerogels dried at ambient pressure are synthesized by using resorcinol-formaldehyde as carbon precursor and adding P123 to strengthen their skeletons. CO2 activation is used to improve surface areas and adjust pore size distribution. Carbon aerogels are characterized by BET surface measurement, constant-current charge/discharge and cyclic voltammetry (CV). It is found that a specific capacitance of 261 F/g is obtained in 6 mol/L KOH electrolytes. With a decreasing production cost, carbon aerogels dried at ambient pressure have an ideal electrochemical performance and potential application as electrode materials.
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Key words:
- supercapacitor /
- dried at ambient pressure /
- carbon aerogels /
- CO2 activation
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