Journal
ELECTROCHIMICA ACTA
Volume 434, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2022.141338
Keywords
Polypyrrole nanotubes; Polydopamine; Grinding; Electrochemical performance; Sodium -ion capacitor
Categories
Funding
- Natural Science Foun-dation of Shandong Province
- Introduction and Cultivation Plan of Young Innovative Talents in Colleges and Uni-versities of Shandong Province
- [ZR2019MEM015]
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This study investigates the application of polypyrrole nanotubes (PNTs) in electrochemical energy-storage systems (EES). The researchers developed a composite of polydopamine (PDA)-modified PNTs and found that it exhibited enhanced electrochemical performance, with higher capacitance retention and specific capacitance compared to pristine PNTs.
Conductive polymers have a great potential for application in electrochemical energy-storage systems (EES). However, the structural instability due to the swelling/shrinking of polymer chains during charge/discharge cycles hampers the wide use of conductive polymers in EES. In this paper, polypyrrole nanotubes (PNTs) are first produced by a methyl orange-templated method. The influence of the feeding sequence of reactants on the size, morphology, specific surface area, and conductivity of PNTs is explored. Second, a composite of polydopamine (PDA)-modified PNTs (PNT/PDA) is produced by grinding PNTs with dopamine hydrochloride (DAH) in N -methyl pyrrolidone. Dopamine in situ transforms into PDA modifier while PNTs are in situ doped by the hy-drochloride. The effect of DAH/PNTs weight ratio on the electrode performance is investigated. The specific capacitance is doubled and the capacitance retention is increased by 26% for PNT/PDA after 1000 cycles at 1 A g-1, compared with pristine PNTs. Also, the asymmetric PNT/PDA||MnO2 sodium-ion capacitor presents a capacitance retention of 83.7% after 10,000 cycles with varying current densities in the range of 0.5-5 A g-1, higher than that of 70.5% for PNT-based counterpart. The enhanced electrochemical performance of PNT/PDA is attributed to the in situ acid doping and the electron transfer from PDA to PNTs due to the catecholic chemistry.
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