Nanocomposites of polypyrrole/graphene nanoplatelets/single walled carbon nanotubes for flexible solid-state symmetric supercapacitor
Nanocomposites of polypyrrole/graphene nanoplatelets/single walled carbon nanotubes for flexible solid-state symmetric supercapacitor
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DOI：
10.1016/j.eurpolymj.2019.08.030
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发表时间：
2019-11-01
影响因子：
6
通讯作者：
Malik, Sudip
中科院分区：
文献类型：
--
作者：
Dhibar, Saptarshi;Roy, Arkapal;Malik, Sudip
随着化石燃料的迅速枯竭和能源消耗的不断增加，可再生和可持续能源的发展已成为储能领域面临的首要挑战之一。在此，利用碳质部分的电化学双层电容和导电聚合物的赝电容，采用低成本且简单的制备过程来制造基于石墨烯纳米片（GP）、单壁碳纳米管（SWNT）和聚吡咯（PPy）[GP/SWNTs/PPy]的纳米复合材料，作为优异的超级电容器电极材料。光谱技术表明 GP 和 SWNT 均与 PPy 存在相互作用。从形态分析中观察到，GP 被 PPy 均匀覆盖，并且覆盖的 GP 被 PPy 涂覆的 SWNT 包裹，具有独特的形态。该纳米复合材料在电流密度0.5 A/g下的比电容最高为1224 F/g，实现了更好的能量和功率密度。此外，还制备了基于GP/SWNTs/PPy的全固态柔性超级电容器器件，其在电流密度0.5 A/g下的比电容为324 F/g，能量密度为28.8 Wh/kg，功率密度为1975.22 W/kg。除了这些电化学特性外，这些纳米复合材料还表现出非线性电流-电压特性，表明了半导体行为。考虑到优异的电化学性能，这些纳米复合材料应用作制造硬币型超级电容器的优质电极材料。
With the rapid depletion of fossil fuels and rising energy consumption, the development of renewable as well as sustainable energy source has become one of the foremost challenges in energy storage. Herein, a low-cost and easy preparation procedure has been employed for the fabrication of nanocomposites based on graphene nanoplatelets (GP), single-walled carbon nanotubes (SWNTs) and polypyrrole (PPy) [GP/SWNTs/PPy] for the superior supercapacitor electrode materials by taking advantage of electrochemical double layer capacitance of carbonaceous moieties and pseduocapacitance of conducting polymer. Spectroscopic techniques have suggested the interactions of both GP and SWNTs with PPy. GPs are homogeneously covered by PPy and the covered GPs are wrapped by PPy coated SWNTs to have a unique morphology, observed from morphological analysis. Highest specific capacitance of 1224 F/g at current density 0.5 A/g, better energy and power density have been achieved for the nanocomposite. Further, GP/SWNTs/PPy based all-solid state flexible supercapacitor device has been fabricated and it has showed the specific capacitance of 324 F/g at current density 0.5 A/g, energy density of 28.8 Wh/kg and power density of 1975.22 W/kg. Apart from these electrochemical characteristics, these nanocomposites have exhibited nonlinear current-voltage characteristic, indicating the semiconducting behavior. Considering the excellent electrochemical properties, these nanocomposites should be used for the superior electrode materials for the fabrication of coin-type supercapacitor.