Three-Dimensional Graphene/Polyaniline Composite Hydrogel as Supercapacitor Electrode
Three-Dimensional Graphene/Polyaniline Composite Hydrogel as Supercapacitor Electrode
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DOI：
10.1149/2.058210jes
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发表时间：
2012
影响因子：
3.9
通讯作者：
Zhixin Tai;Xingbin Yan;Q. Xue
中科院分区：
文献类型：
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作者：
Zhixin Tai;Xingbin Yan;Q. Xue
本工作采用自组装法制备了三维石墨烯/聚苯胺(GNS/PANI)复合水凝胶，并对其进行了原位聚合。用X射线衍射仪、傅里叶变换红外光谱仪和拉曼光谱对材料的化学结构进行了表征。PANI纳米纤维均匀分布在GNSS表面或GNSS之间，形成了一种轻质的3D复合水凝胶。由于PANI的增强作用，加入PANI后，纯GNS水凝胶的电容性能显著提高。GNS/PANI复合水凝胶的比电容最大，为334Fg−1，比纯GNS水凝胶提高约150%。此外，还进一步研究了样品在高、低工作温度(60℃和−5℃)下的电化学性质。由于PANI的热不稳定性，GNS/PANI复合水凝胶的比电容和循环稳定性对操作温度有很强的依赖性，尤其是在高温下。因此，基于上述研究，这种GNS/PANI复合水凝胶有望成为在温暖环境下使用的高性能电容器电极的潜在候选者。
In this work, a three-dimensional (3D) graphene/polyaniline (GNS/PANi) composite hydrogel was prepared via a self-assembled method followed by in situ polymerization of aniline. The chemical structure of the materials was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and Raman. The PANi nanofibers homogeneously distribute on the surfaces of the GNSs or among the GNSs, forming a light-weight and 3D composite hydrogel. Due to the reinforcing effects coming from PANi, the capacitive performance of pure GNS hydrogel is significantly improved after adding PANi. The GNS/PANi composite hydrogel exhibits the largest specific capacitance of 334 F g −1 , which is about 150% higher than that of pure GNS hydrogel. In addition, the electrochemical properties of the samples are further studied at the high and low operating temperatures (60 and −5°C). Due to the thermal-instability of PANi, the specific capacitance and the cycle-stability of the GNS/PANi composite hydrogel show strong dependent on the operating temperature, especially at high temperature. Therefore, based on the above investigations, such GNS/PANi composite hydrogel would be a potential candidate for high-performance capacitor electrodes using at warm environment.