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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Effect of dilution ratio and drying method of resorcinol-formaldehyde carbon gels on their electrocapacitive properties in aqueous and non-aqueous electrolytes
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Effect of dilution ratio and drying method of resorcinol-formaldehyde carbon gels on their electrocapacitive properties in aqueous and non-aqueous electrolytes

机译：间苯二酚-甲醛碳凝胶的稀释比例和干燥方法对其在水性和非水性电解质中电电容性能的影响

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摘要

Carbon gels were prepared by carbonization of organic gels from a resorcinol-formaldehyde mixture in the presence of potassium carbonate and with two different dilution ratios. The organic hydrogels were dried under supercritical and subcritical conditions and by lyophilization. After carbonization, the carbon aerogels, xerogels, and cryogels were characterized by N-2 and CO2 adsorption at -196 and 0 A degrees C, respectively, and by X-ray photoelectron spectroscopy to determine their surface area, porosity, and surface oxygen content. Electrocapacitive properties were studied by cyclic voltammetry, chronopotentiometry, and electrochemical impedance spectroscopy in a two-electrode cell in acidic and non-aqueous aprotic electrolytes. Results obtained showed that the gravimetric capacitance from chronopotentiometry increased linearly for both electrolytes with an increase in the micropore volume accessible to N-2 at -196 A degrees C and in the S (BET). In both series of carbon gels, the cryogel had the lowest electrical resistance and fastest discharge time from electrochemical impedance spectroscopy, indicating that lyophilization may generate a pore texture with lesser tortuosity and greater regularity in comparison with the other drying methods.
机译：碳凝胶是通过在碳酸钾存在下，由间苯二酚-甲醛混合物以两种不同的稀释比对间苯二酚-甲醛混合物进行碳化而制得的。有机水凝胶在超临界和亚临界条件下并通过冻干干燥。碳化后，分别通过在-196和0 A摄氏度下的N-2和CO2吸附，以及通过X射线光电子能谱确定其表面积，孔隙率和表面氧含量来表征碳气凝胶，干凝胶和冰凝胶。通过循环伏安法，计时电位法和电化学阻抗谱研究了在酸性和非水非质子电解质中的两电极电池中的电电容特性。获得的结果表明，计时电位法的重量电容对于两种电解质都呈线性增加，在-196 A摄氏度下，N-2和S（BET）的微孔体积增加。在这两个系列的碳凝胶中，冷冻凝胶的电阻最低，电化学阻抗谱分析的放电时间最快，这表明与其他干燥方法相比，冻干可能会产生曲折度较小且规则性较大的孔结构。

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