Опубликована: Янв. 1, 2024
Pseudocapacitance materials can store charge through reversible redox reactions, making them attractive for high-energy density supercapacitors. However, their practical applications are limited by low capacitance, insufficient active sites, and poor cycling stability. To address these issues, we develop an extrinsic phase transformation strategy to alter the pseudocapacitive into battery-type with a well-defined construction of amorphous/crystalline hetero-phases multi metal sulfides. The optimal in-situ growth hetero-phase cobalt molybdenum sulfides-nickel sulfides on carbon fiber cloth (CoMoS4-NiS2@CFC) is designed as positrode. CoMoS4-NiS2@CFC electrode exhibits superior areal capacity 1341 mC cm-2 remarkable retention ~91% after 5000 cycles. Theoretical calculations revealed metallic nature favorable OH- ion adsorption energy -4.35 eV which enhances its storage performance. Furthermore, hybrid supercapacitor (HSC) comprising CoMoS4-NiS2@CFC//AC demonstrates high specific 51.99 W h kg-1 at power 800 kg-1, sustains 23.83 8.0 kW robust cyclic stability (~91%) over 10000 Quasi-solid state (QSS) flexible HSC maximum volumetric 12 mW cm-3 3812 ~92% retention. This work advances design multi-metal sulfides, contributing significantly development high-performance devices.
Язык: Английский