两种质子酸掺杂聚吡咯电化学性能的比较  

Comparison of electrochemical performance between polypyrroles doped with two kinds of protonic acids

作　　者：陈泳[1] 李娟娟[1] 郝蓉蓉 CHEN Yong;LI Juan-juan;HAO Rong-rong(College of Petrochemical Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)

机构地区：[1]兰州理工大学石油化工学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2018年第5期69-74,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51503092;51663014)

摘　　要：分别以H_2SO_4和HNO_3作为聚合电解液,通过循环伏安法在不锈钢网上合成了质子酸掺杂的聚吡咯(PPy).采用傅里叶变换红外光谱(FT-IR)、X射线衍射(XRD)和场发射扫描电镜(SEM)对其结构和形貌进行表征.分别在1mol·L^(-1) HNO_3和0.5mol·L^(-1) H_2SO_4的电解液中,通过循环伏安法(CV)、恒流充放电(GCD)和交流阻抗谱法(EIS)对电极材料的电化学性能进行测试.结果表明:PPy/HNO_3电极材料具有疏松多孔的珊瑚状结构,而PPy/H_2SO_4呈现出菜花状结构;电流密度为5mA·cm-2时,在0.5mol·L^(-1) H_2SO_4电解液中,PPy/0.5mol·L^(-1) HNO_3比电容为596F·g-1,循环1 000次后比电容保持了95.9%,在1.0mol·L^(-1) HNO_3电解液中,PPy/0.1mol·L^(-1) H_2SO_4比电容为442F·g-1,循环1 000次后比电容保持了70.6%,相比之下,HNO_3掺杂后的聚吡咯电极材料表现出更优异的电化学性能.Taking H 2SO 4 and HNO 3 respectively as electrolyte for polymerization,the protonic aciddoped polypyrrole(PPy)was polymerized with cyclic voltammetry on stainless steel mesh.Its structure and morphology was characterized by means of Fourier transform infrared(FT-IR)spectrography,X-ray diffraction(XRD),and field-emission scanning electron microscopy(SEM).The electrochemical properties of electrode material were tested with cyclic voltammetry(CV),galvanostatic charge-discharge(GCD)method,and electrochemical impedance spectroscopy(EIS)in 1.0 mol·L-1 HNO 3 and 0.5 mol·L-1 H 2SO 4 electrolyte,respectively.The result showed that the electrode material PPy/HNO 3 would have a loose and porous coral-like structure while the PPy/H 2SO 4 would exhibit a cauliflower-like structure.When the current density was 5 mA·cm-2,the specific capacitance of PPy to 0.5 mol·L-1 HNO 3 would be 596 F·g-1 in 0.5 mol·L-1 H 2SO 4 electrolyte and after 1 000 cycles,the specific capacitance would remain 95.9%.Meanwhile,the specific capacitance of PPy to 0.1 mol·L-1 H 2SO 4 would be 442 F·g-1 in 1.0 mol·L-1 HNO 3 electrolyte and the specific capacitance would remain 70.6%after 1 000 cycles.In comparison with each other,the electrode material of poly-pyrrole doped with HNO 3 would possess more excellent electrochemical performance.

关 键 词：质子酸 聚吡咯 循环伏安法 比电容 

分 类 号：O646[理学—物理化学]