不同尺寸聚吡咯纳米球的制备及其电容性质研究  

Preparation of polypyrrole nanospheres with different sizes and their capacitive properties

作　　者：文华 程泓康 任莉君 窦树梅 韩银凤 WEN Hua;CHENG Hong-kang;REN Li-jun;DOU Shu-mei;HAN Yin-feng(Engineering Research Center for Titanium-Based Functional Materials and Devices in Universities of Shaanxi Province,College of Chemistry and Chemical Engineering,Baoji University of Arts and Sciences,Baoji 721013,Shaanxi,China)

机构地区：[1]宝鸡文理学院化学化工学院,钛基功能材料与器件陕西省高校工程研究中心,陕西宝鸡721013

出　　处：《宝鸡文理学院学报(自然科学版)》2024年第4期31-36,共6页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：陕西省科技厅自然科学基础研究计划项目(2023-JC-YB-120);陕西省大学生创新创业训练计划项目(S202310721095)。

摘　　要：目的研究电极材料的粒径尺寸变化对其电容性质的影响,为超级电容器性能的改善提供实验依据。方法以不同质量分数的聚乙烯醇(PVA)为稳定分散剂,FeCl_(3)·6H_(2)O为氧化剂,采用原位聚合法制备不同尺寸聚吡咯(PPy)纳米球。研究PVA质量分数对制备PPy粒径尺寸和质量比电容的影响,筛选出质量比电容优异的PPy-PVA-2.4电极材料进行倍率性能和循环稳定性研究。结果调控PVA的质量分数可获得尺寸分布范围为50~110 nm的PPy纳米球,随着PPy纳米球尺寸减小,PPy纳米球电极质量比电容增大。相较于PPy-PVA-0电极,PPy纳米球电极的质量比电容可增加18%~27%。当电流密度从0.5 A/g增至10 A/g时,PPy-PVA-2.4纳米球电极质量比电容从315 F/g减小至196 F/g,电容保持率为62%。PPy-PVA-2.4纳米球电极在电流密度为10 A/g循环1000圈后的质量比电容保持率为83%。结论PVA的质量分数是影响PPy纳米球粒径尺寸的重要因素,PPy电极材料粒径尺寸减小有利于其电容性质的充分发挥。Purposes—To provide experimental basis for improving the performance of supercapacitors by investigating the effects of electrode materials’particle size changes on the capacitive properties.Methods—With polyvinyl alcohol(PVA)as dispersion stabilizer and FeCl_(3)·6H_(2)O as oxidizing agent,polypyrrole(PPy)nanospheres with different sizes were prepared with in-situ polymerization method.The effects of PVA mass fraction on the particle size and specific capacitance of PPy were studied.Furthermore,the PPy-PVA-2.4 electrode material with excellent specific capacitance was selected to study its rate performance and cycle stability.Results—The PPy nanospheres with size distribution ranging from 50 to 110 nm were obtained by regulating the mass fraction of PVA.The specific capacitances of PPy nanosphere electrodes increased with the decrease in the size of PPy nanosphere.Compared with the PPy-PVA-0 electrode,the specific capacitances of the PPy nanosphere electrodes were increased by 18%~27%.The specific capacitance of the PPy-PVA-2.4 electrode decreased from 196 F/g to 315 F/g when the current density increased to 10 A/g from 0.5 A/g,and its capacitance retention was 62%.Moreover,the specific capacitance retention of the PPy-PVA-2.4 nanosphere electrode was 83%after 1000 cycles at a current density of 10 A/g.Conclusions—The mass fraction of PVA is an important factor to affect the particle size of PPy nanospheres,and the reduction of PPy electrode material's particle size is benefit to making good use of its capacitive properties.

关 键 词：聚乙烯醇 聚吡咯 电极材料 电容性质 

分 类 号：O646.5[理学—物理化学]