A conducting polymer-based hydrogel (PPy/CPH) with a polypyrrole-poly(vinyl alcohol) interpenetrating network was prepared by utilization of a chemical cross-linked poly(vinyl alcohol)-HSO hydrogel (CPH) film as flexible substrate followed by vapor-phase polymerization of pyrrole. Then an all-solid-state polymer supercapacitor (ASSPS) was fabricated by sandwiching the CPH film between two pieces of the PPy/CPH film. The ASSPS is mechanically robust and flexible with a tensile strength of 20.83 MPa and a break elongation of 377% which is superior to other flexible conducting polymer hydrogel-based supercapacitors owing to the strong hydrogen bonding interactions among the layers and the high mechanical properties of the PPy/CPH. It exhibits maximum volumetric specific capacitance of 13.06 F/cm and energy density of 1160.9 μWh/cm. The specific capacitance maintains 97.9% and 86.3% of its initial value after 10 000 folding cycles and 10 000 charge-discharge cycles, respectively. The remarkable electrochemical and mechanical performance indicates this novel ASSPS device is promising for flexible electronics.
Developing waterborne
epoxy (WEP) coatings with excellent corrosion
resistance and tribological properties is a key aspect to solve the
damage of Q235 steel. In this work, perylene bisimide (PBI) derivatives
dispersion graphene (GR) were prepared by a π–π
stacking, the highly orientated PBI0.5%/GR0.5%/WEP coating will be prepared by the rotating coating method. Especially,
the impedance value reached about 109 Ω·cm2 when the PBI and GR ratio is 1:1. The impedance value of
PBI0.5%/GR0.5%/WEP coating increased by 3 orders
of magnitude compared with that of pure WEP coating (106 Ω·cm2). Additionally, the coefficient of friction
of the coatings was 0.33; compared with that of WEP, the coefficient
of friction decreased by 48%, and the wear resistance increased by
87.6%. The results show that the PBI0.5%/GR0.5%/WEP coatings exhibited excellent corrosion resistance and wear resistance
properties due to the good dispersion and high orientation of PBI/GR
in WEP. It is anticipated that our current work would guide the ongoing
efforts to develop a more efficient method to overcome the poor dispersion
of GR in waterborne epoxy resin and provide a green coating with excellent
corrosion resistance and wear resistance properties.
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