A nonaqueous potassium-ion hybrid capacitor enabled by two-dimensional diffusion pathways of dipotassium terephthalate.

ABSTRACT: Nonaqueous potassium-ion hybrid capacitors (KIHCs) are faced with limited redox reaction kinetics of electrodes for accommodation of large-sized K⁺. Here, dipotassium terephthalate (K₂TP) is applied as an organic negative electrode to provide comparable reaction kinetics with a non-faradaic activated carbon (AC) positive electrode to boost the electrochemical performance of KIHCs. It is revealed that the large exchange current density and fast two-dimensional (2D) diffusion pathways of K⁺ in K₂TP determined by density functional theory (DFT) calculations ensure its fast redox reaction and transport kinetics. The as-constructed KIHC presents both high energy and power densities of 101 W h kg^-1 and 2160 W kg^-1 based on the mas

SUBMITTER: Luo Y 

PROVIDER: S-EPMC6375359 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature