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基于各向同性褶皱碳纳米管薄膜的全方位可拉伸高性能超级电容器。

Omnidirectionally Stretchable High-Performance Supercapacitor Based on Isotropic Buckled Carbon Nanotube Films.

机构信息

School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, P.R. China.

Suzhou Institute of Nano-Tech and Nano-Bionics , Suzhou 215123, P. R. China.

出版信息

ACS Nano. 2016 May 24;10(5):5204-11. doi: 10.1021/acsnano.6b00752. Epub 2016 Apr 26.

Abstract

The emergence of stretchable electronic devices has attracted intensive attention. However, most of the existing stretchable electronic devices can generally be stretched only in one specific direction and show limited specific capacitance and energy density. Here, we report a stretchable isotropic buckled carbon nanotube (CNT) film, which is used as electrodes for supercapacitors with low sheet resistance, high omnidirectional stretchability, and electro-mechanical stability under repeated stretching. After acid treatment of the CNT film followed by electrochemical deposition of polyaniline (PANI), the resulting isotropic buckled acid treated CNT@PANI electrode exhibits high specific capacitance of 1147.12 mF cm(-2) at 10 mV s(-1). The supercapacitor possesses high energy density from 31.56 to 50.98 μWh cm(-2) and corresponding power density changing from 2.294 to 28.404 mW cm(-2) at the scan rate from 10 to 200 mV s(-1). Also, the supercapacitor can sustain an omnidirectional strain of 200%, which is twice the maximum strain of biaxially stretchable supercapacitors based on CNT assemblies reported in the literature. Moreover, the capacitive performance is even enhanced to 1160.43-1230.61 mF cm(-2) during uniaxial, biaxial, and omnidirectional elongations.

摘要

可拉伸电子设备的出现引起了人们的广泛关注。然而,现有的大多数可拉伸电子设备通常只能在一个特定的方向上拉伸,并且表现出有限的比电容和能量密度。在这里,我们报告了一种各向同性褶皱的碳纳米管(CNT)薄膜,它可用作超级电容器的电极,具有低面电阻、各向同性拉伸性以及在反复拉伸下的机电稳定性。在 CNT 薄膜经过酸处理后,通过电化学沉积聚苯胺(PANI),得到的各向同性褶皱酸处理 CNT@PANI 电极在 10 mV s(-1)时表现出 1147.12 mF cm(-2)的高比电容。该超级电容器的能量密度从 31.56 到 50.98 μWh cm(-2),相应的功率密度从 2.294 到 28.404 mW cm(-2),扫描速率从 10 到 200 mV s(-1)。此外,超级电容器可以承受 200%的各向同性应变,这是文献中报道的基于 CNT 组装体的双轴可拉伸超级电容器的最大应变的两倍。此外,在单向、双向和各向同性伸长过程中,电容性能甚至增强到 1160.43-1230.61 mF cm(-2)。

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