海藻酸钠的浓度对聚苯胺/海藻酸钠电化学性能的影响

以海藻酸钠(SA)为软模板,采用原位氧化聚合法制备了聚苯胺/海藻酸钠(PANI/SA)电极材料,研究了SA的浓度对其结构、形貌及电化学性能的影响。利用傅里叶变换红外光谱(FTIR)和扫描电镜(SEM)对所制PANI/SA的结构和形貌进行了表征。在1 mol/L H2SO4溶液中,通过循环伏安法(CV)、恒电流充放电(CD)和交流阻抗法(EIS)测试了电极材料的电化学性能。结果表明:PANI/SA的比电容随聚合体系中SA质量分数的增大先升高后降低,w(SA)=0.01%时,PANI/SA为由纳米纤维相互交织缠绕的网状结构,其比电容最高(459.7F/g),较纯PANI提高了20.8%。

Effect of Sodium Alginate Concentration on the Electrochemical Performance of Polyaniline/Sodium Alginate

Polyaniline/sodium alginate(PANI/SA) was successfully synthesized by oxidative polymerization of aniline using sodium alginate (SA) as soft template. The structure and morphology of the products were characterized by Fourier transform infrared spectrum (FTIR) and scanning electron microscopy (SEM). The electrochemical properties of the as-prepared PANI/SA were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge (CD) test and electrochemical impedance spectroscopy (EIS) in 1 mol/L H2SO4 aqueous electrolyte. The results showed that the specific capacitance of the prepared PANI/SA increased firstly but decreased then with the increasing of the concentration of SA. The PANI/SA appeared as a network morphology intertwined with the nanofibers and showed a higher specific capacitance of 459.7 F/g with the SA mass fraction of 0.01%, which was an improvement over that of pure PANI(20.8%).