PPy@FeOOH/CFs纸基柔性电极的原位制备与性能研究

Study on In Situ Preparation and Performance of PPy@FeOOH/CFs Paper-based Flexible Electrode

关键词:  纸基电极  原位沉积法  羟基氧化铁  聚吡咯

Key Words:paper-based electrode  in situ deposition  FeOOH  polypyrrole

摘要:本研究以纤维素纤维（CFs）为基底，通过两步原位沉积法，先后在CFs基底上沉积了羟基氧化铁（FeOOH）和聚吡咯（PPy）制得PPy@FeOOH/CFs纸基柔性电极材料（PFC），通过扫描电子显微镜（SEM）、X射线衍射仪（XRD）、傅里叶变换红外光谱仪（FT-IR）及X射线光电子能谱仪（XPS）等对纸基柔性电极材料进行了表征，表明PFC成功制备。在0.6 mol/L的H₂SO₄中，通过循环伏安法（CV）、恒流充放电（GCD）和电化学阻抗谱（EIS）对制备的PFC电化学性能进行测试。发现相较于PPy@CFs，PFC拥有更快的电子转移和离子扩散速度以及更高的电化学储能性能。其中以添加量3 mmol的FeSO₄·7H₂O作为铁源生成的PFC-3在1.0 A/g电流密度下的质量比电容为357.8 F/g，高于同等条件下PPy@CFs的比电容219.3 F/g，具有更优异的电化学性能，此外PFC-3在电流密度为4.0 A/g时质量比电容为0.5 A/g时的47.47%，而电流密度为4.0 A/g时，PPy@CFs质量比电容仅为0.5 A/g时的29.57%，PFC-3表现出更好的倍率性能和应用潜力。

Abstract:Using cellulose fibers （CFs） as the substrate， PPy@FeOOH/CFs （PFC） flexible paper-based electrode material was prepared by two-step in situ deposition of FeOOH and polypyrrole （PPy） successively on the CFs substrate. The paper-based electrode was characterized by SEM， XRD， FT-IR and XPS， which proved PFC was successfully preparated. The electrochemical performances of the PFC paper-based electrode in 0.6 mol/L H₂SO₄ aqueous solution were measured by Cyclic voltammetry （CV）， galvanostatic charge-discharge （GCD） and electrochemical impedance spectroscopy （EIS）. The results showed that PFC had faster migration of electrons and diffusion of ions as well as higher electrochemical energy storage performance compared with PPy@CFs. When the current density was 1.0 A/g， the specific capacitance of PFC prepared with 3 mmol FeSO₄·7H₂O as the iron source was 357.8 F/g， which was higher than 219.3 F/g of PPy@CFs， indicating PFC-3 had better electrochemical performance and greater application potential in flexible energy storage devices. In addition， the mass ratio capacitance of PFC-3 at 4.0 A/g current density was 47.47% of 0.5 A/g， while PPy@CFs was only 29.57% of 0.5 A/g at 4.0 A/g current density. PFC-3 showed better electrochemilal performance and application potential.