利用激光制备多层石墨烯设计的对称超级电容器器件的电化学性能

Electrochemical performance of a symmetric supercapacitor device designed using laser-produced multilayer graphene

  • 摘要: 本研究报告了一种经济高效的激光诱导石墨烯(LIG)制备方法,该方法可提高LIG在超级电容器中的电化学性能。以聚酰亚胺聚合物为原料,在环境条件下用CO2激光照射可合成LIG。通过拉曼光谱和傅里叶变换红外光谱对制备的LIG样品进行了表征,验证了含有sp2杂化C=C键的多层石墨烯的形成。FE-SEM展示出LIG的三维(3D)片状结构,HR-TEM图像显示了晶面间距约为0.33 nm的晶格平面,对应于石墨烯的(002)平面。LIG的电化学性能显示,在1 mA cm−2(3.3 A g−1)的电流下,在1 mol L−1 KOH作为水性电解质的三电极配置中,其面积比电容(CA)为51 mF cm−3(170 F g−2)。LIG电极有3.5 Wh cm−2能量密度、350 W cm−2的功率密度等显著的储能能力。它们还具有优异的循环稳定性,在1 mA cm−2下循环3 000次后仍保持87%的比电容。使用LIG电极和1 mol L−1 KOH电解质制造的对称超级电容器的比电容为23 mF cm−2,在10 000次循环后表现出优异的保留率,显示了LIG在超级电容器中的应用潜力。

     

    Abstract: We report an economical approach for the fabrication of laser-produced graphene (LPG) electrodes, which results in an improved electrochemical performance. Polyimide polymer was used as the starting material for LPG synthesis and was irradiated under ambient conditions with a CO2 laser. The prepared LPG samples were characterized by Raman spectroscopy and FTIR, which validated the formation of multilayer graphene containing sp2 hybridized C=C bonds. FE-SEM revealed three-dimensional (3D) sheet-like structures, while HR-TEM images showed lattice planes with an interplanar spacing of approximately 0.33 nm, corresponding to the (002) plane of graphene. Their electrochemical performance showed a remarkable areal specific capacitance (CA) of 51 mF cm2 (170 F g1) at 1 mA cm2 (3.3 A g1) in a three-electrode configuration with 1 mol L1 KOH as the aqueous electrolyte. The LPG electrodes produced an energy density of ~3.5 µWh cm2 and a power density of ~350 µW cm2, demonstrating significant energy storage ability. They also had an excellent cycling stability, retaining 87% of their specific capacitance after 3 000 cycles at 1 mA/cm2. A symmetric supercapacitor fabricated with LPG electrodes and the 1 mol L1 KOH electrolyte had a specific capacitance of 23 mF cm2 and showed excellent retention after 10 000 cycles, showing LPG’s potential for use in supercapacitors.

     

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