Abstract
Poly(anthraquinonyl sulfide) (PAQS)/graphene sheets (GSs) composite was synthesized through in situ polymerization to evaluate its performance as an electrode material for electrochemical capacitors. PAQS was successfully synthesized in the presence of GSs with uniform distribution. PAQS/GSs showed a pair of reversible redox peaks at around 0 V (vs. Ag/AgCl). The specific capacitance of PAQS/GSs was 349 F·g−1 (86 mAh·g−1) at a current density of 500 mA·g−1, and a capacitance of 305 F·g−1 was maintained even at a high current density of 5000 mA·g−1. The in situ polymerization of PAQS with GSs facilitated their interaction and enabled faster charge transfer and redox reaction, resulting in enhanced electrode properties.
Highlights
The increased demand for clean, renewable energy has led to intense research efforts into energy storage systems
We focused on Poly(anthraquinonyl sulfide) (PAQS) as an electrode material for electrochemical capacitors
PAQS/Graphene sheets (GSs) showed a pair of strong redox peaks at around 0 V
Summary
The increased demand for clean, renewable energy has led to intense research efforts into energy storage systems. Quinone-based materials can provide high capacitance through a two-electron redox reaction, degradation of performance due to the dissolution of quinone molecules into both aqueous and organic electrolytes is a significant obstacle to their use in energy storage devices [14,21,22]. We synthesized PAQS in the presence of dispersed GSs (PAQS/GSs) to investigate the influence of in situ polymerization of PAQS with GSs on the electrode properties for electrochemical capacitors This in situ polymerization was a simple process because of the favorable π–π interactions between PAQS and GSs. The microstructure and electrode properties of PAQS/GSs were evaluated in order to understand the reaction activity of PAQS in aqueous electrolyte and the effect of in situ polymerization with GSs
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