Novel Synthesis and Characterization of Flexible MnO2/CNT Composites Co-deposited on Graphite Paper as Supercapacitor Electrodes
Novel Synthesis and Characterization of Flexible MnO2/CNT Composites Co-deposited on Graphite Paper as Supercapacitor Electrodes
复制标题
石墨纸上共沉积柔性 MnO2/CNT 复合材料作为超级电容器电极的新合成和表征
DOI：
10.1007/s11664-022-09575-x
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发表时间：
2022-03-31
影响因子：
2.1
通讯作者：
Li, Duosheng
中科院分区：
文献类型：
--
作者：
Li, Xueqin;Zhu, Zhixiang;Li, Duosheng
虽然MnO 2具有理论比容量高、资源丰富、易于合成和环境友好等优点，但其导电性差、利用率低，严重阻碍了其作为超级电容器电极的大规模应用。通过简单的复合刷镀方法在柔性膨胀石墨纸（EGP）上共沉积了MnO 2和碳纳米管（CNT）复合材料。复合材料中碳纳米管的三维导电网络大大提高了MnO 2电极的超电容性能和机械性能。本文主要研究了复合刷镀电压的选择和活性物质碳纳米管浓度对超级电容器性能的影响。当电流密度为20 A g（-1）时，在1.5 g L-1 CNTs滴加电解液中，工作电位为10 V的柔性CNT @ MnO 2/EGP电极的质量比电容为146 F g（-1）。CNT @ MnO 2/EGP/活性炭（AC）/碳纤维布（CFC）柔性水性非对称超级电容器（ASC）在126.2 W kg（-1）的功率密度下表现出36.3 Wh kg（-1）的能量密度和高循环稳定性，在4000次循环后具有91%的电容保持率。该研究为大规模生产柔性MnO 2超级电容器电极提供了一种简单而新颖的技术。[图形]。
Although MnO2 possesses many advantages, such as a high theoretical specific capacity, resource abundance, easy synthesis and environmental friendliness, its poor electrical conductivity and low utilization seriously hinder its large-scale application as an electrode in supercapacitors. A MnO2 and carbon nanotube (CNT) composite is co-deposited on flexible expanded graphite paper (EGP) by a facile method of composite brush plating. The three-dimensional conductive net of CNT in the composite greatly improves the supercapacitve and mechanical properties of MnO2 electrode. The paper mainly studied (i) the choice of composite brush plating voltage and (ii) the effect of the concentration of active substance CNTs deposited on the performance of supercapacitor. When the current density is 20 A g(-1), the mass specific capacitance of the flexible CNT@MnO2/EGP electrode with an operation potential of 10 V in an electrolyte of 1.5 g L-1 CNTs dropped is 146 F g(-1). The CNT@MnO2/EGP/active carbon (AC)/carbon fibre cloth (CFC) flexible aqueous asymmetric supercapacitor (ASC) exhibits an energy density of 36.3 Wh kg(-1) at a power density of 126.2 W kg(-1) and high cycling stability with 91% capacitance retention after 4000 cycles. This study paves the way to provide a simple and novel technique for the mass production of flexible MnO2 supercapacitor electrodes.[GRAPHICS].