CAJ | 학술논문

热解柠檬酸镁或柠檬酸钡,制备了两种介孔炭(MgC或BaC),并将其用作双电层电容器电极材料.采用氮气吸附、扫描电子显微镜和傅里叶红外光谱对所制介孔炭进行表征.结果表明:所制介孔炭孔结构与柠檬酸盐所含金属阳离子有关.其中,BaC呈典型的双峰孔径分布,最可几孔径分别为3. 8nm和15nm;而MgC的孔道主要是小尺寸的介孔或微孔.通过循环伏安、恒流充放电法测试所制介孔炭作为电化学电容器电极材料时的电化学性质.测试表明,在离子液体中MgC和BaC都具有很高的比电容值,分别达到180F·g-1和171F·g-1.其中,BaC的倍率性能良好,能量密度可达到53. 3Wh·kg-1,最大功率密度为20kW·kg-1.BaC优良的电容特性主要归因于其孔径双峰分布的孔结构和亲水性表面化学性质.
열해저몽산미혹저몽산패,제비료량충개공탄(MgC혹BaC),병장기용작쌍전층전용기전겁재료.채용담기흡부、소묘전자현미경화부리협홍외광보대소제개공탄진행표정.결과표명:소제개공탄공결구여저몽산염소함금속양리자유관.기중,BaC정전형적쌍봉공경분포,최가궤공경분별위3. 8nm화15nm;이MgC적공도주요시소척촌적개공혹미공.통과순배복안、항류충방전법측시소제개공탄작위전화학전용기전겁재료시적전화학성질.측시표명,재리자액체중MgC화BaC도구유흔고적비전용치,분별체도180F·g-1화171F·g-1.기중,BaC적배솔성능량호,능량밀도가체도53. 3Wh·kg-1,최대공솔밀도위20kW·kg-1.BaC우량적전용특성주요귀인우기공경쌍봉분포적공결구화친수성표면화학성질.
Two mesoporous carbons were prepared by simple pyrolysis of commercial magnesium or barium citrate and tested as electrode materials for electrochemical double-layer capacitors (EDLCs), denoted MgC and BaC, respectively. The as-prepared carbon materials were characterized by N2 adsorption, scanning electron microscopy and Fourier transform infrared spectrometry. Nitrogen adsorption measurements demonstrated that the porosity of the prepared carbons was related to the type of metal cation. BaC possesses a typical bimodal pore size distribution (PSD) at 3.8 and about 15nm, while MgC was between small-size mesoporous and microporous. The carbons were tested as electrode materials using different electrochemical means such as cyclic voltammetry and constant current charge-discharge. Very high specific capacitance (180F·g-1 for MgC and 171F·g-1 for BaC) was achieved in an ionic liquid electrolyte. BaC proved to be an excellent electrode material with a high rate performance for EDLC application and exhibited an energy density up to 53.3Wh·kg-1 and a high maximum specific power density of 20kW·kg-1 in IL electrolyte. The good capacitive performance of BaC is attributed to its bimodal PSD and hydrophilic surface properties.