Degradation-induced capacitance: a new insight into the superior capacitive performance of polyaniline/graphene composites,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Degradation-induced capacitance: a new insight into the superior capacitive performance of polyaniline/graphene composites
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2017-09-13 00:00:00 , DOI: 10.1039/c7ee02018j
Qin’e Zhang _{1,

2,

3,

4} , An’an Zhou _{1,

2,

3,

4} , Jingjing Wang _{1,

2,

3,

4} , Jifeng Wu _{1,

2,

3,

4} , Hua Bai _{1,

2,

3,

4,

5}

Affiliation

Polyaniline/graphene (PANI/graphene) composites are the most investigated electrode materials for supercapacitors, owing to their high specific capacitance and excellent rate performance. However, a specific capacitance larger than the theoretical limit of the composite has been frequently reported for PANI/graphene composites, and the reason for this over-high capacitance has not been understood. In this work, after systematically investigating the evolution of the electrochemical and spectral properties of PANI/graphene, we prove that the hydroxyl- or amino-terminated oligoanilines generated from degradation of PANI possess a large specific capacitance (>1000 F g⁻¹), and they significantly increase the total specific capacitance of the composite electrode. Graphene in the composite serves as a conductive matrix for electron transport between the low-conductivity hydroxyl or amino-terminated oligoanilines and the current collector. Based on the above results, we put forward a suggestion for simultaneously improving the specific capacitance and cycling stability of the PANI/graphene composites. A PANI/reduced graphene oxide composite material with a specific capacitance of 719 F g⁻¹ at 1.4 A g⁻¹ and 91.3% capacitance retention after 10 000 cycles is obtained.

中文翻译：

降解引起的电容：对聚苯胺/石墨烯复合材料优异电容性能的新见解

聚苯胺/石墨烯（PANI /石墨烯）复合材料因其高的比电容和出色的倍率性能而成为超级电容器研究最多的电极材料。然而，对于PANI /石墨烯复合物，经常报道比电容大于复合物的理论极限，并且尚未理解这种过高电容的原因。在这项工作中，在系统地研究了PANI /石墨烯的电化学和光谱性质的演变之后，我们证明了由PANI降解产生的羟基或氨基末端的低聚苯胺具有较大的比电容（> 1000 F g ^-1），并且它们显着增加了复合电极的总比电容。复合材料中的石墨烯用作低电导率的羟基或氨基端基低聚苯胺与集电器之间电子传输的导电基质。基于以上结果，我们提出了同时改善PANI /石墨烯复合材料的比电容和循环稳定性的建议。获得了在1.4 A g ^-1下具有719 F g ^-1的比电容和10000次循环后91.3％的电容保持率的PANI /还原氧化石墨烯复合材料。

更新日期：2017-11-08

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11