Carbon Nanotube Based Robust and Flexible Solid-State Supercapacitor
Carbon Nanotube Based Robust and Flexible Solid-State Supercapacitor
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DOI：
10.1021/acsami.1c12551
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发表时间：
2021-12-01
影响因子：
9.5
通讯作者：
Talapatra, Saikat
中科院分区：
文献类型：
--
作者：
De Silva, Thushani;Damery, Cole;Talapatra, Saikat
全固态柔性电化学双层电容器（EDLC）对于在各种应用中提供能源选择至关重要，从可穿戴电子产品到可弯曲的微/纳米技术。在这里，我们报告的强大的EDLCs使用对齐的多壁碳纳米管（MWCNTs）直接生长在薄金属箔嵌入在聚（乙烯醇）/磷酸（PVA/H3 PO 4）聚合物凝胶的发展。保持对齐的MWCNT组件的薄金属基底提供了机械坚固性，并且PVA/H3 PO 4聚合物凝胶既用作电解质又用作隔膜，提供了足够的结构柔性，在弯曲条件下没有任何电荷存储容量的损失。这些装置的性能稳定性通过在直的和弯曲的地层下测试来验证。在这些器件中可以获得类似于14.5mF cm（-2）的高面积比电容（C-SP）值和类似于1 μ W·h·cm（-2）的能量密度。这些值显著高于（在某些情况下，数量级）几种石墨烯以及利用类似电解质的单壁纳米管基EDLC。我们进一步表明，这些器件可以承受多次（类似于2500次）机械弯曲循环，而不会失去其储能能力，并且在20至70摄氏度的温度范围内发挥作用。几种策略，用于提高电容性电荷存储，如物理堆叠（并行）的个别设备，或生产后的热退火的电极，也被证明。本文中展示的这些发现为实现坚固，可堆叠和灵活的全固态超级电容器提供了巨大的推动力。
All solid-state flexible electrochemical double-layer capacitors (EDLCs) are crucial for providing energy options in a variety of applications, ranging from wearable electronics to bendable micro/nanotechnology. Here, we report on the development of robust EDLCs using aligned multiwalled carbon nanotubes (MWCNTs) grown directly on thin metal foils embedded in a poly(vinyl alcohol)/phosphoric acid (PVA/H3PO4) polymer gel. The thin metal substrate holding the aligned MWCNT assembly provides mechanical robustness and the PVA/H3PO4 polymer gel, functioning both as the electrolyte as well as the separator, provides sufficient structural flexibility, without any loss of charge storage capacity under flexed conditions. The performance stability of these devices was verified by testing them under straight and bent formations. A high value of the areal specific capacitance (C-SP) of similar to 14.5 mF cm(-2) with an energy density of similar to 1 mu W h cm(-2) can be obtained in these devices. These values are significantly higher (in some cases, orders of magnitude) than several graphene as well as single-walled nanotube-based EDLC's utilizing similar electrolytes. We further show that these devices can withstand multiple (similar to 2500) mechanical bending cycles, without losing their energy storage capacities and are functional within the temperature range of 20 to 70 degrees C. Several strategies for enhancing the capacitive charge storage, such as physically stacking (in parallel) individual devices, or postproduction thermal annealing of electrodes, are also demonstrated. These findings demonstrated in this article provide tremendous impetus toward the realization of robust, stackable, and flexible all solid-state supercapacitors.