The Enhanced Mechanism Of Magnetic Field on Double-Layer Supercapacitors

Abstract

Recently, magnetic field applications in electrochemistry have attracted growing attention, particularly demonstrating significant advantages in enhancing energy storage performance and optimizing electrochemical synthesis. However, research on the magnetic field enhancement mechanism of double-layer supercapacitors (EDLC) is still relatively scarce and has not yet been experimentally confirmed. This study is based on the Gouy-Chapman-Stern model, employing a combined approach of multi -physics simulation (COMSOL) and experimental validation to investigate the mass transfer process of ions from the electrolyte to the electrode surface under a magnetic field and its enhancement mechanism on EDLC. The results indicate that the current-magnetic field relationship generally conforms to the theoretically predicted B1/3 mathematical dependence, which has been experimentally confirmed. This mechanism can be attributed to the Lorentz force generated by the external magnetic field, which causes solute ions to undergo spiral motion, reduces the thickness of the diffusion boundary layer, promotes mass transfer processes, and thus increases the current density of the double-layer supercapacitor. These findings provide a theoretical basis for understanding how magnetic fields affect the electrochemical behavior of supercapacitors and open up new avenues for optimizing magnetic-electric coupled energy storage devices.

Keywords: Enhanced mechanism, Magnetic field, double-layer supercapacitor, Magnetohydrodynamic effect, Multi-physics simulation