Pracownicy

Streszczenie:
This study explores the development of porous poly(vinylidene luoride-co-hexafluoropropylene) based gel polymer electrolytes (GPEs) via a general polyethylene glycol extraction method, fol-lowed by the incorporation of perchlorate salts (LiClO4, Mg(ClO4)2, NaClO4). The influence of cation valency and ionic radius on ionic transport was systematically investigated for high-voltage supercapacitors (SCs). Among the prepared electrolytes, the LiClO4 based GPE exhibits the high-est ionic conductivity of 7.4 × 10−3 S cm−1 at room temperature along with a stable electrochemi-cal window of 2.6 V and superior performance in symmetric SCs. Symmetric SCs assembled with activated carbon achieved a specific capacitance of 76.7 F g−1 and retained excellent cycling sta-bility of 96.9% after 10 000 consecutive charge-discharge cycles measured at a current density of 1 A g−1. This work highlights the enhanced performance of ion transport attributed to a well-interconnected porous structure at the electrode−electrolyte interface and provides insights into the role of chemistry in high-performance SCs.

Słowa kluczowe:
activated carbon, gel polymer electrolyte, ionic conductivity, supercapacitor, temperature dependence

Streszczenie:
This work presents a novel approach to the development of supercapacitor technology through the integration of a gel polymer electrolyte (GPE) and Ag nanoparticle (NP) modified Mn3O4 electrodes. To the best of our knowledge, this is the first study to employ a GPE comprising poly(vinylidene fluoride)-co-hexafluoropropylene (PVdF-HFP) as the host polymer, propylene carbonate (PC) as the plasticizer, and magnesium perchlorate (Mg(ClO4)2) as the salt, in conjunction with Ag NP-modified Mn3O4 electrodes. The study also introduces a pioneering low-temperature ultrasonication method for the attachment of Ag NPs to Mn3O4, which eliminates the need for a reducing agent. This approach is characterized by its simplicity, cost-effectiveness, and scalability, offering significant advantages over conventional methods. The electrochemical performance of the resulting supercapacitor cells, featuring the modified electrodes and novel GPE, was comprehensively evaluated, yielding a single electrode specific capacitance of 9.38 F g⁻¹, with an energy density of 1.9 Wh kg⁻¹, and a power density of 30.8 W kg⁻¹. The findings demonstrate the potential of this new system to enhance energy storage capabilities, marking a substantial advancement in supercapacitor research, and this study sets the foundation for future investigations into scalable, high-performance energy storage solutions, emphasizing both innovation in material design and process optimization

Słowa kluczowe:
Manganese oxide, Mn3O4, Silver nanoparticles, Ag, Gel polymer electrolyte, Supercapacitor

Słowa kluczowe:
Supercapacitor, transition metal oxides, asymmetric supercapacitor, hydrothermal