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Core–Shell Composite Fibers for High-Performance Flexible Supercapacitor Electrodes
ACS Applied Materials & Interfaces ( IF 9.5 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acsami.7b12997
Xiaoyan Lu 1 , Chen Shen 1 , Zeyang Zhang 1 , Elizabeth Barrios 1 , Lei Zhai 1
Affiliation  

Core–shell nanofibers containing poly(acrylic acid) (PAA) and manganese oxide nanoparticles as the core and polypyrrole (PPy) as the shell were fabricated through electrospinning the solution of PAA and manganese ions (PAA/Mn2+). The obtained nanofibers were stabilized by Fe3+ through the interaction between Fe3+ ions and carboxylate groups. Subsequent oxidation of Mn2+ by KMnO4 produced uniform manganese dioxide (MnO2) nanoparticles in the fibers. A PPy shell was created on the fibers by immersing the fibers in a pyrrole solution where the Fe3+ ions in the fiber polymerized the pyrrole on the fiber surfaces. In the MnO2@PAA/PPy core–shell composite fibers, MnO2 nanoparticles function as high-capacity materials, while the PPy shell prevents the loss of MnO2 during the charge/discharge process. Such a unique structure makes the composite fibers efficient electrode materials for supercapacitors. The gravimetric specific capacity of the MnO2@PAA/PPy core–shell composite fibers was 564 F/g based on cyclic voltammetry curves at 10 mV/s and 580 F/g based on galvanostatic charge/discharge studies at 5 A/g. The MnO2@PAA/PPy core–shell composite fibers also present stable cycling performance with 100% capacitance retention after 5000 cycles.

中文翻译:

高性能柔性超级电容器电极的核壳复合纤维

通过静电纺丝PAA和锰离子(PAA / Mn 2+)的溶液,制备了以聚丙烯酸(PAA)和锰氧化物纳米颗粒为核,聚吡咯(PPy)为壳的核-壳纳米纤维。通过Fe 3+离子与羧酸根基团的相互作用,获得的纳米纤维被Fe 3+稳定。随后用KMnO 4氧化Mn 2+可以在纤维中产生均匀的二氧化锰(MnO 2)纳米颗粒。通过将纤维浸入吡咯溶液中,在纤维上产生PPy壳,其中纤维中的Fe 3+离子使吡咯在纤维表面聚合。在MnO 2中@ PAA / PPy核-壳复合纤维,MnO 2纳米颗粒用作高容量材料,而PPy壳则可防止在充电/放电过程中MnO 2的损失。这种独特的结构使复合纤维成为超级电容器的有效电极材料。MnO 2 @ PAA / PPy核-壳复合纤维的重量比容量基于循环伏安曲线在10 mV / s时为564 F / g,基于恒电流在5 A / g下的充放电研究为580 F / g。MnO 2 @ PAA / PPy核-壳复合纤维还表现出稳定的循环性能,在5000次循环后具有100%的电容保持率。
更新日期:2018-01-16
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