Electrochemical capacitive performance of free-standing polyindole film and effect of introducing alkyl chain connecting two indoles
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Polyindole (PIn), combining the good properties of polypyrrole and poly(para-phenylene), has been gained significant attention. But the capacitive performances of PIn and its derivatives electropsynthesized in boron trifluoride diethyl etherate (BFEE) were unknown so far. So we first prepared the free-standing PIn film in BFEE and studied its capacitive property. The specific capacitance value of PIn could achieve 270.2 F g−1 at high current density of 10 A g−1. And the capacitance retained of PIn 84.06% after 3000 cycles. For further studying the effect of introducing alkyl chains on the electrochemical properties of PIn, poly1,3-di(1H-indol-1-yl)propane (P(IP-3)), poly1,6-di(1H-indol-1-yl)hexane (P(IH-6)), and poly1,12-di(1H-indol-1-yl)dodecane (P(ID-12)) bridged by alkyl chains with different lengths were electrosynthesized in BFEE. Through a series of experiments, we found that the specific capacitance performances of P(IP-3), P(IH-6), and P(ID-12) were poorer than PIn, indicating the introduction of alkyl chains altered the electrochemical properties of the π-conjugated backbone of PIn and lowered its the properties, which could be proved by scanning electron microscope.
We are grateful to the Innovation Driven “5511” Project of Jiangxi Province (Grant No. 20165BCB18016), the Natural Science Foundation of Jiangxi Province (Grant No. 20181BAB216011), Project of Jiangxi Educational Committee (Grant No. GJJ180633), Scientific Research Foundation for Doctors in Jiangxi Science and Technology Normal University (Grant No. 2017BSQD006) and Projects for Postgraduate Innovation in Jiangxi (Grant No. YC2018-X30).