  Supercapacitors have been attracting significant attention as promising
energy storage devices. However, the voltage window limitation associated with
electrolyte solutions has hindered the improvement of their capacitance. To
address this issue and enhance the energy storage capabilities of general
traditional supercapacitors, we put forward the dipole induced effects observed
in the theoretical framework of the electric double-layer structure. The
molecular dynamics results demonstrate that, compared to traditional systems,
an improvement of over 50% in integral capacitance at low voltages is achieved.
Moreover, a new material-based experimental results obtained from a dielectric
supercapacitor employing a hydrated electrolyte solution corroborated the
effectiveness of our proposed model, yielding consistent outcomes. We attribute
the large capacitance variation to the reorientation of the dipoles, which
induces the neutral-to-bilayer transition and the overscreening-to-steric
transition, consistent with the polarization process of the polymer in the
experiment. We further investigate the capacitance variations under different
dipole parameters, such as varying the number of layers, different number
densities and different spacings, thereby enriching the experimental results
with additional conclusions not previously obtained. This work presents a novel
approach that exploits dipole-induced capacitance effects, paving the way for
further advances in the field of energy storage technology.
