采用复合工艺制备二维过渡金属碳化物@碳纳米管(MXene@CNT)导电墨水与碳纳米管@聚苯胺(CNT@PANI)墨水,通过共同打印得到非对称微电容。X射线衍射仪与透射电子显微镜表征证实构建了MXene-CNT复合体系,随着碳纳米管(CNT)的引入,MXene的层间距逐渐增大,证实了CNT的引入能够有效抑制MXene片层的自堆叠。拉曼光谱与扫描电子显微镜形貌分析显示,复合组分在A4纸基材表面均匀分布。电化学测试表明,CNT的复合显著改变储能机理:CNT@PANI/MXene@CNT微电容体系的双电层电容贡献率从原始CNT@PANI/MXene微电容的33%提升至56%,证实储能过程向双电层主导机理转变。CNT质量分数为5%时,5mV/s扫描速率下CNT@PANI/MXene@CNT微电容性能最优,面积比电容达30.02mF/cm2,能量密度提升至6.2μWh/cm2,循环10000次后仍维持80.65%的初始容量,表现出良好的稳定性。3组串联微电容的工作电压可达4.2V,并驱动发光二极管实现持续2min的稳定发光。这种性能提升主要归因于CNT构建的三维导电网络有效提高了电荷传输效率,同时MXene与PANI的协同作用增强了界面电荷存储能力。
The composite process was employed to prepare 2D transition metal carbide@carbon nanotube (MXene@CNT) conductive ink and carbon nanotube@polyaniline (CNT@PANI) ink,and asymmetric microcapacitors were constructed via co-printing.XRD and TEM characterizations confirmed the successful fabrication of the MXene-CNT composite system.Notably,the interlayer spacing of MXene gradually increased with the incorporation of CNTs,demonstrating effective suppression of MXene sheet self-stacking.Raman spectroscopy and SEM morphological analysis revealed uniform distribution of the composite components on the A4 paper substrate.Electrochemical tests indicated that the CNT composite significantly altered the energy storage mechanism:the electric double-layer capacitance contribution of the CNT@PANI/MXene@CNT (CNT@PANI/MXene@CNT) microcapacitor system increased from 33% (baseline CNT@PANI/MXene) to 56%,confirming a transition toward an electric double-layer-dominated mechanism.When the CNT content was 5%,the C1P1/MXC-5 system exhibited optimal performance at 5mV/s,achieving an areal specific capacitance of 30.02mF/cm2 and an enhanced energy density of 6.2μWh/cm2.Remarkably,the device retained 80.65% of its initial capacity after 10000 cycles,demonstrating excellent stability.Upon series connection of three microcapacitors,the working voltage reached 4.2V,successfully powering a light-emitting diode (LED) for 2 minutes.This performance enhancement primarily stemmed from the three-dimensional conductive network formed by CNTs,which significantly improved charge transfer efficiency,while the synergistic effect between MXene and PANI enhanced interfacial charge storage capability.
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基金资助
国家自然科学基金(51302109)
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