Synthesis, chemical polymerization and electrochemical properties of low band gap conducting polymers for use in supercapacitors
作者:Patrick Soudan、Philippe Lucas、Hoang Ang Ho、Donald Jobin、Livain Breau、Daniel Bélanger
DOI:10.1039/b006577n
日期:——
A set of nine monomers derived from diaryl-cyanovinylene, -carboxyvinylene
and -cyanobutadiene were synthesized as were the corresponding polymers resulting
from the chemical polymerization of the monomers in the presence of an almost
quantitative amount of FeCl3 in chloroform. The aim of this work
was to investigate the effect of the chemical structure of the polymers on
their charge capacitance and stability upon galvanostatic charge/discharge
cycling. The electrochemical performances of composite electrodes based on
polymer, acetylene black and PTFE have been investigated in acetonitrile containing
1 M Et4NBF4 using cyclic voltammetry and galvanostatic
charge/discharge cycling experiments. The best performances in terms of
charge capacitance for both the p- and n-doping processes were demonstrated
with poly(7)
(2E,4E)-2,5-di-2-thienylpenta-2,4-dienenitrile
and poly(9)
(2E)-3-(2,2′-bithienyl-5-yl)-2-(2-thienyl)prop-2-enenitrile
since values as high as 245 C g−1 were obtained
with poly(7) in its n-doped
state and 325 C g−1 with p-doped poly(9). The energy density (68 Wh kg−1)
and power density (24 kW kg−1) delivered
by a poly(9) capacitor
are in good agreement with those expected from cyclic voltammetry and galvanostatic
charge/discharge experiments performed with single electrodes. Unfortunately,
a capacitance loss was observed upon cycling and was ascribed exclusively
to the n-doping process occurring at the negative electrode since the capacitance
of the positive electrode remained almost unchanged during these experiments.
一组来自二芳基氰烯烃、氰基乙烯和氰基丁二烯的九种单体被合成,相应的聚合物也在氯仿中几乎定量的FeCl3存在下进行化学聚合。此次研究的目的是探讨聚合物化学结构对其电荷电容和在恒电流充放电循环中的稳定性的影响。基于聚合物、乙炔黑和聚四氟乙烯的复合电极在含有1 M Et4NBF4的乙腈中进行了循环伏安法和恒电流充放电循环实验。无论是在p掺杂还是n掺杂过程中,聚(7) (2E,4E)-2,5-二(2-噻吩基)戊-2,4-二烯腈和聚(9) (2E)-3-(2,2'-二噻吩基-5-基)-2-(2-噻吩基)丙-2-烯腈在电荷电容方面表现出最佳性能,其中聚(7)在其n掺杂状态下获得高达245 C g−1的值,而p掺杂的聚(9)则达到325 C g−1。聚(9)电容器提供的能量密度(68 Wh kg−1)和功率密度(24 kW kg−1)与在单电极上进行的循环伏安法和恒电流充放电实验所预期的结果良好吻合。不幸的是,在充放电循环中观察到电容损失,这被完全归因于在负极发生的n掺杂过程,因为在这些实验中正极的电容几乎保持不变。