Highly Porous Holey Carbon for High Areal Energy Density Solid-State Supercapacitor Application

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Biomass materials are recognized as sustainable, carbon-rich precursors for advanced carbon material synthesis.
• Developing high-performance energy storage devices relies on novel electrode materials with optimized structures.

Purpose of the Study:

• To demonstrate the capacitance performance of biomass-derived carbon using golden shower tree seeds (GTs) as precursors.
• To investigate the electrochemical properties of porous carbon (GTPC) activated by potassium ferrate (K2FeO4).
• To fabricate and evaluate a solid-state supercapacitor device using the synthesized activated carbon.

Main Methods:

• Golden shower tree seeds (GTs) were utilized as carbon precursors.
• Potassium ferrate (K2FeO4) was employed as the activation agent to produce porous carbon (GTPC).
• A symmetric solid-state supercapacitor was assembled using optimized activated carbon (GTPC-1) and a PVA/H2SO4 gel electrolyte.

Main Results:

• The synthesized porous carbon (GTPC) exhibited an ultrahigh specific surface area of 1915 m² g⁻¹ with abundant pores.
• The material demonstrated superior electrochemical performance attributed to its well-constructed porous structure and high surface area.
• The assembled solid-state supercapacitor device achieved a maximum areal energy density of 42.93 µWh cm⁻² at a power density of 520 µW cm⁻².

Conclusions:

• Biomass-derived porous carbon activated by potassium ferrate is a promising material for high-performance supercapacitors.
• The optimized activated carbon (GTPC-1) facilitates the development of efficient solid-state energy storage devices.
• This approach offers a sustainable pathway for fabricating advanced electrode materials for energy applications.