Journal
SYNTHETIC METALS
Volume 252, Issue -, Pages 135-141Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.synthmet.2019.04.019
Keywords
Polypyrrole; Phosphomolybdic acid; Microspheres; Electrochemical performance
Funding
- National Natural Science Foundation of China [51603116]
- China Scholarship Council (CSC)
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Microsphere-structured polypyrrole (PPy) induced and doped by phosphomolybdic acid with high redox activity is synthesized by a facile in situ polymerization method. The diameter of the microsphere can be controlled in the range of 100(similar to)120 nm by the introduction of p-toluene sulfonic acid (TSA), which can also be used as codopant for PPy. The electrochemical performances the resulted PPy microspheres have been greatly improved. When the molar ratio of TSA:pyrrole is 0.5:1, PPy microsphere can provide the highest specific capacitance of 400 F/g, which is more than 3 times as much as that of pristine PPy. In this study, phosphomolybdic acid played multi-functional roles as the oxidant, redox-active dopant as well as spherical inducing agent for PPy. The improved capacitance could be attributed to the bipolaronic structure evidenced by Fourier-transform infrared spectroscopy, Raman and electron spin resonance measurements originating from the codoping effect. The formation mechanism of the PPy mircospheres is also proposed.
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