CAJ | 학술논문

以间苯二酚和甲醛为前驱体,原位合成的Mg(OH)_2为模板剂,KOH作为催化剂、沉淀剂、活化剂,一步法合成具有小/中/大孔的分级多孔炭.使用扫描电镜、透射电镜、氮气吸附、X射线衍射对样品的结构进行表征.通过恒流充放电、循环伏安、电化学阻抗谱,测试样品在1 mol/L的(C_2H_5)_4NBF_4/碳酸丙烯酯(Propylene carbonate PC)电解液中的电化学性能.结果表明,随着KOH对间苯二酚用量的增加,材料的比表面积和孔容先增大后减小,其最大值分别为1 300 m~2/g和0.89 cm~3/g.该材料具有良好的容量性能和功率性能,在电流密度0.1 A/g时,最高质量比电容可以达到116 F/g;当电流密度增大到5 A/g时,电容保持率为78%.
이간분이분화갑철위전구체,원위합성적Mg(OH)_2위모판제,KOH작위최화제、침정제、활화제,일보법합성구유소/중/대공적분급다공탄.사용소묘전경、투사전경、담기흡부、X사선연사대양품적결구진행표정.통과항류충방전、순배복안、전화학조항보,측시양품재1 mol/L적(C_2H_5)_4NBF_4/탄산병희지(Propylene carbonate PC)전해액중적전화학성능.결과표명,수착KOH대간분이분용량적증가,재료적비표면적화공용선증대후감소,기최대치분별위1 300 m~2/g화0.89 cm~3/g.해재료구유량호적용량성능화공솔성능,재전류밀도0.1 A/g시,최고질량비전용가이체도116 F/g;당전류밀도증대도5 A/g시,전용보지솔위78%.
Hierarchical porous carbons with micro/meso/macropores were prepared by a one-step route with resorcinol and formaldehyde as precursors, in-situ synthesized Mg(OH)_2 as a template and KOH as reaction catalyst , precipitating agent and activation agent. The structures of the hierarchical porous carbons were characterized by scanning electron microscopy, transmission electron microscopy, nitrogen adsorption and X-ray diffraction measurements. The electrochemical behavior of the samples was tested by galvanostatic charge-discharge, cyclic voltammetry and electrochemical impedance spectroscopy using 1 mol/L (C_2H_5) _4NBF_4/ Propylene carbonate (PC) as electrolyte. The results show that the specific surface area and the pore volume of the carbons increase first and then decrease with an increase of mass ratio of KOH to resorcinol. The highest values, 1 300 m~2/g and 0.89 cm~3/g, were achieved, respectively. Moreover, the resultant carbon exhibits excellent capacitance and power performance when was used as the electrode material for electric double-layer capacitor. The highest specific capacitance up to 116 F/g was obtained at a current density 0.1 A/g and the ratio of retained capacitance of the sample was 78% at a current density 5 A/g.