Journal
CHEMICAL ENGINEERING JOURNAL
Volume 430, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133012
Keywords
Continuous PEDOT:PSS nanomesh film; Aqueous electrochemical capacitor; AC line filtering; Ultrahigh energy density; Rotating disk triboelectric nanogenerator
Categories
Funding
- National Natural Science Foundation of China [21805072, 22075019]
- Top-Notch Talent Program of Henan Agricultural University, China [30500738]
- Young Talent Program of Henan Agricultural Univer-sity, China [30500601]
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Filtering capacitors with high energy densities play a critical role in stabilizing pulse signals in circuits. This work presents an ultrafast aqueous electrochemical capacitor based on polymer networks, showing outstanding performance in ripple filtering and signal smoothing across a wide frequency range.
Filtering capacitors with high energy densities are of critical importance in stabilizing the pulse signal of circuits that require the conversion of alternating current to direct current, which is however far from satisfactory at current stage due to lack of a reasonable design. Here, we report an ultrafast aqueous electrochemical capacitor based on highly conductive and continuously cross-linked poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) nanomesh films fabricated using a rational morphology engineering strategy. The interpenetrating polymer network promoted an efficient electron transfer and provided smooth channels for ion transport while exposing a significant number of accessible interfacial area to electrolyte. In addition to the large phase angle of - 84 degrees at 120 Hz, this polymer-based electrochemical capacitor exhibited an extremely high areal specific capacitance of 1087 mu F cm(-2) and areal specific energy density of 544 mu F V-2 cm(-2), far superior to those of most reported aqueous filtering capacitors. Furthermore, it can efficiently smoothen the ripples generated when arbitrary alternating current waveforms were converted into straight signals over a wide frequency range of 1-10,000 Hz. Moreover, it was conveniently integrated with a rotating disk triboelectric nanogenerator for ripple filtering and pulse energy smoothing. This work brings a view for aqueous filtering capacitors with high performance.
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