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首页> 外文期刊>Journal of power sources >Effect of pore size and surface area of carbide derived carbons on specific capacitance
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Effect of pore size and surface area of carbide derived carbons on specific capacitance

机译：碳化物衍生碳的孔径和表面积对比电容的影响

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This work presents a systematic study on how pore size and specific surface area (SSA) of carbon effect specific capacitance and frequency response behavior. Carbide derived carbons (CDC) produced by leaching metals from TiC and ZrC at temperatures from 600 to 1200 deg C have highly tailorable microstructure and porosity, allowing them to serve as excellent model systems for porous carbons in general. BET SSA and average pore size increased with synthesis temperature and was 600-2000 m~2 g~(-1) and 0.7-1.85 nm, respectively. Maximum specific capacitance in 1 M H_2SO_4 was found to occur at an intermediate synthesis temperature, 800 deg C, for both ZrC and TiC derived carbons and was 190 and 150 F g~(-1), respectively. Volumetric capacitance for TiC and ZrC derived carbons was maximum at 140 and 110 F cm~(-3). These results contradict an oft-reported axiom that increasing pore size and SSA, all other tilings being held constant, increases specific capacitance. A correlation between specific capacitance and SSA of micropores (less than 2 nm in diameter) has been shown. As expected, increasing pore size was found to improve the frequency response. However, CDCs with similar pore size distributions but obtained from different starting materials showed noticeable differences in impedance behavior. This highlights the importance of not only the pore size and specific surface area measured using gas sorption techniques, but also the pore shape or tortuousity, which is non-trivial to characterize, on energy storage.
机译：这项工作提出了关于碳的孔径和比表面积（SSA）如何影响比电容和频率响应行为的系统研究。通过在600至1200摄氏度的温度下从TiC和ZrC浸出金属而生成的碳化物衍生碳（CDC）具有高度可定制的微观结构和孔隙率，因此，它们通常可以用作多孔碳的出色模型系统。 BET SSA和平均孔径随合成温度的增加而增加，分别为600-2000 m〜2 g〜（-1）和0.7-1.85 nm。发现ZrC和TiC衍生的碳在1 M H_2SO_4中的最大比电容出现在中间合成温度800摄氏度时，分别为190和150 F g〜（-1）。 TiC和ZrC衍生碳的体积电容在140和110 F cm〜（-3）时最大。这些结果与经常报道的公理相矛盾，公理是增加孔径和SSA（所有其他平铺保持恒定）会增加比电容。已经显示出比电容和微孔的SSA（直径小于2 nm）之间的相关性。如预期的那样，发现增加孔径可以改善频率响应。但是，具有相似孔径分布但从不同起始材料获得的CDC在阻抗行为方面显示出明显差异。这凸显了不仅重要的是使用气体吸附技术测得的孔径和比表面积，而且对于储能而言，孔的形状或曲折的重要性也非同小可。

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