Towards High-Energy and Anti-Self-Discharge Zn-Ion Hybrid Supercapacitors with New Understanding of the Electrochemistry.

ABSTRACT: Aqueous Zn-ion hybrid supercapacitors (ZHSs) are increasingly being studied as a novel electrochemical energy storage system with prominent electrochemical performance, high safety and low cost. Herein, high-energy and anti-self-discharge ZHSs are realized based on the fibrous carbon cathodes with hierarchically porous surface and O/N heteroatom functional groups. Hierarchically porous surface of the fabricated free-standing fibrous carbon cathodes not only provides abundant active sites for divalent ion storage, but also optimizes ion transport kinetics. Consequently, the cathodes show a high gravimetric capacity of 156 mAh g^-1, superior rate capability (79 mAh g^-1 with a very short charge/discharge time of 14 s) and exceptional cycling stability. Meanwhile, hierarch

SUBMITTER: Li Y 

PROVIDER: S-EPMC8006207 | biostudies-literature | 2021 Mar

REPOSITORIES: biostudies-literature