A Hybrid All-Solid-State Supercapacitor Using a Dry Multilayered Graphene Oxide Electrolyte Assembly: Understanding
Mawin J M Jimenez1, Marco A E Maria1,2,3, Leonardo M Leidens1
1Instituto de Física 'Gleb Wataghin' (IFGW), Universidade Estadual de Campinas (UNICAMP), Campinas, São Paulo 13083-970, Brazil.
ACS Omega
|November 3, 2025
Summary
Researchers developed a simplified hybrid all-solid-state supercapacitor using poly-(diallyldimethylammonium chloride) (PDDA)/graphene oxide (GO) multilayers. This innovation offers high energy and power densities for efficient energy storage without liquid electrolytes.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Supercapacitors are crucial for energy storage innovation, offering higher energy density than capacitors and higher power density than batteries.
- Limitations in volumetric performance and the need for liquid electrolytes hinder widespread supercapacitor adoption.
Purpose of the Study:
- To develop a simplified method for manufacturing a hybrid all-solid-state supercapacitor.
- To investigate the performance characteristics and structural role of chlorine in a PDDA/GO system.
Main Methods:
- Utilized the layer-by-layer (LbL) technique to assemble poly-(diallyldimethylammonium chloride) (PDDA) and graphene oxide (GO) multilayers.
- Conducted molecular dynamics simulations with and without water to analyze the PDDA/GO system's structure and the role of chlorine.
Main Results:
- Achieved rapid discharge (relaxation time constant down to 1 μs), high energy density (up to 7 Wh/kg), and high power density (up to 1400 W/kg).
- Demonstrated specific capacitance up to 12 F/g and highlighted the crucial role of chlorine in the system's structure.
- Showcased the advantages of excluding liquid electrolytes and using ultrathin films for practical applications.
Conclusions:
- The simplified LbL assembly offers a promising route for manufacturing high-performance, all-solid-state supercapacitors.
- The developed supercapacitors exhibit excellent electrochemical performance and suitability for various applications due to their thin-film nature and lack of liquid electrolytes.
