Polyaniline-Grafted Graphene Hybrid with Amide Groups and Its Use in Supercapacitors

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• 作者：Junwei An ; Jianhua Liu ; Yecheng Zhou ; Haifeng Zhao ; Yuxiao Ma ; Mengliu Li ; Mei Yu ; Songmei Li
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：September 20, 2012
• 年：2012
• 卷：116
• 期：37
• 页码：19699-19708
• 全文大小：669K
• 年卷期：v.116,no.37(September 20, 2012)
• ISSN：1932-7455

文摘

Unlike conventional routes for preparing graphene/polyaniline (G/PANI) composites coupled by van der Waals forces, an approach to graft polyaniline (PANI) nanofibers onto graphene to acquire a polyaniline鈥揼raphene (PANI鈥揋) hybrid connected by amide groups is described in this study. The chemical bonding between graphene and PANI is confirmed by infrared spectroscopy and X-ray photoelectron spectroscopy. The Raman spectrum of PANI鈥揋 hybrid demonstrates a close interaction between graphene and PANI. Electrochemical tests show that PANI鈥揋 hybrid has a high capacitance (623.1 F/g) at a current density of 0.3 A/g, higher than that in G/PANI composites reported previously. In addition, the retained capacitance of the PANI鈥揋 hybrid in the long term charge/discharge cycling test reached as high as 510 F/g at a current density of 50 A/g, suggesting its potential use in supercapacitors. First-principle calculations were carried out to study the electronic structures of PANI鈥揋 hybrid. The results show that the carbonyl group in the amide linkage plays a key role in the formation of 蟺-conjugated structure, facilitates charge transfer, and consequently improves capacitance and cycling ability.