CAJ | 학술논문

电化学电容器已经成为极具潜力的可满足高功率需求的储能系统器件.多孔炭具有大比表面积、高导电性、化学惰性、廉价及可调孔结构等优势,因此成为电化学电容器最为常用的电极材料.本文报道由微孔棒状羟基磷灰石为模板及蔗糖为碳源合成的新型具有层次孔道结构的孔炭材料的电化学电容器的性能.采用X射线衍射分析仪、扫描电子显微镜、透射电子显微镜、X射线光电子能谱及BET表面分析仪表征了合成的多孔炭的形貌及表面特性.采用循环伏安法、交流阻抗图谱分析及恒流充放电评价多孔炭材料在1 mol·L-1硫酸中的电化学电容性能.多孔炭具有高的比表面积(719.7 m2·g-1)和大的孔容(1.32 cm3·g-1),其无序的孔道由任意分布的微孔、坍塌的中孔及类模板形状的相互交织的棒状中孔组成.随着炭化温度的增加,微孔及棒状中孔的密度随之降低,在炭化温度高达900°C 时,孔径分布图上出现了三个峰.正是由于这些特殊的结构特征,由900°C炭化得到的多孔炭制成的电极展示出很好的电化学电容性能.
전화학전용기이경성위겁구잠력적가만족고공솔수구적저능계통기건.다공탄구유대비표면적、고도전성、화학타성、렴개급가조공결구등우세,인차성위전화학전용기최위상용적전겁재료.본문보도유미공봉상간기린회석위모판급자당위탄원합성적신형구유층차공도결구적공탄재료적전화학전용기적성능.채용X사선연사분석의、소묘전자현미경、투사전자현미경、X사선광전자능보급BET표면분석의표정료합성적다공탄적형모급표면특성.채용순배복안법、교류조항도보분석급항류충방전평개다공탄재료재1 mol·L-1류산중적전화학전용성능.다공탄구유고적비표면적(719.7 m2·g-1)화대적공용(1.32 cm3·g-1),기무서적공도유임의분포적미공、담탑적중공급류모판형상적상호교직적봉상중공조성.수착탄화온도적증가,미공급봉상중공적밀도수지강저,재탄화온도고체900°C 시,공경분포도상출현료삼개봉.정시유우저사특수적결구특정,유900°C탄화득도적다공탄제성적전겁전시출흔호적전화학전용성능.
Electrochemical capacitors (ECs) are attractive energy storage systems for applications with high power requirements. Porous carbons are the materials that are most frequently used for the electrodes in ECs, because of their large surface area, high conductivity, chemical inertness, low cost, and tunable pore structure. Here, novel hierarchical y micro-meso-structured porous carbons were synthesized, using microporous rod-like hydroxyapatite nanoparticles as a template and sucrose as a carbon source. The morphology and surface properties of the as-prepared porous carbons were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Tel er surface analysis. The electrochemical capacitive performances were evaluated in an aqueous solution of 1 mol·L-1 H2SO4 using cyclic voltammetry, electrochemical impedance spectroscopy, and constant current charge/discharge tests. The resultant carbons showed a high surface area of more than 719.7 m2·g-1, large pore volumes of more than 1.32 cm3·g-1, and a disordered pore structure composed of randomly distributed micropores, col apsed mesopores, and interweaving rod-like mesopores that took the shape of the template. As the carbonization temperature was increased, the density of micropores and rod-like mesopores decreased, and a tri-modal pore size distribution appeared for the carbon sample carbonized at 900 ° C. Because of these unique characteristics, the electrode material originated from the porous carbon carbonized at 900 °C exhibited good electrochemical capacitive performances.