期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 17, 期 30, 页码 19885-19894出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5cp02710a
关键词
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资金
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20110201130005]
- Program for New Century Excellent Talents in University [NCET-11-0433]
- National Natural Science Foundation of China [21274115]
- Natural Science Foundation of Shaanxi Province [2014JM6231]
- 111 Project [B14040]
Polypyrrole is a promising candidate for supercapacitor electrode materials due to its high capacitance and low cost. However, the major bottlenecks restricting its application are its poor rate capability and cycling stability. Herein, we control the morphology of polypyrrole-graphene composites by adjusting the graphene content, causing the typical cauliflower'' morphology of polypyrrole to gradually turn into the homogeneous nano-sheet morphology of these composites. The composites consequently exhibit good thermal stability, high protonation level (37.4%), high electronic conductivity (625.3 S m(-1)), and fast relaxation time (0.22 s). These remarkable characteristics afford a high capacitance of 255.7 F g(-1) at 0.2 A g(-1), still retaining a capacitance of 199.6 F g(-1) at 25.6 A g(-1). In addition, high capacitance retention of up to 93% is observed after 1000 cycles testing at different current densities of 0.2, 1.6, 6.4, 12.8 and 25.6 A g(-1), indicating high stability. The composite's excellent electrochemical performance is mainly attributed to its nano-sheet structure and high electronic conductivity, providing unobstructed pathways for the fast diffusion and exchange of ions/electrons.
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