Ultrahigh discharge efficiency and improved energy density in rationally designed bilayer polyetherimide–BaTiO₃/P(VDF-HFP) composites

Abstract

Ultrahigh efficiencies over 95% and high energy densities are concurrently achieved in rationally designed bilayer polyetherimide–BaTiO3/P(VDF-HFP) composites.

Epsilon‐Negative Carbon Aerogels with State Transition from Dielectric to Degenerate Semiconductor

“…[ 43 ] C p originates from the effective microcapacitors and distributed capacitance formed in the carbon microregions, where the electrical energy was stored in the form of dipole polarization. [ 44 ] However, when the temperature was increased to 800 °C and above, the reactance becomes positive (Figure 5b), at the same time, their permittivity value was negative as analyzed before. The inset in Figure 5b is the equivalent circuits consisting of a parallel capacitor ( C p ) and two parallel inductors ( L ) with resistors ( R L ).…”

“…When the aerogels were carbonized at 600 °C, carbon microregions start to form in the carbon aerogels; any pair of adjacent carbon microregions can serve as a microcapacitor as dielectric polarization can be induced between them. [ 44 ] In this sense, the aerogels can also be considered as a network of microcapacitors, which lead to an increase in the dielectric constant. At 700 °C, the microcapacitor network was enhanced with the decreased distance between the carbon nanoparticles, and a higher capacitance and permittivity was obtained.…”

Carbon fiber skeleton/silver nanowires composites with tunable negative permittivity behavior

“…The feasibility of electromagnetic stealth is verified experimentally [8,9]. In addition, the high energy density and low loss and breakdown strength make the composite material ideal material for high performance dielectric energy storage capacitors [10,11]. The electromagnetic metamaterials have a great value in the fields of wireless communication [12], electromagnetic absorption [13] and shielding [14], etc.…”

Effect of Magnetic Field on the Inhibition Performance of Corrosion Inhibitors with Different Dipole Moment Gradients

“…Figure 5 presents the Nyquist plots of carbon steel measured in 0.5 M H 2 SO 4 solution containing 300 ppm inhibitors with different magnetic field strengths at 30 ℃ for 4 h. As shown in the figure, the impedance spectra consisted of large capacitive loops and obvious inductive loops at high and low frequencies, respectively. The capacitive loops at high frequencies were related to the double-layer capacitance in charge transfer processes, which were associated with interfacial reactions including anodic dissolution and reduction of H + in cathode [48,49]. The sizes of the capacitive loops increased with the application of the magnetic field and showed a positive correlation with field strength.…”