Biomass-Derived Electrode Materials for Supercapacitor Applications

Biomass-derived carbon materials have emerged as a sustainable and versatile class of electrodes for high-performance supercapacitors. Derived from agricultural residues, forestry by-products and food waste, these precursors can be transformed into porous carbons via thermal carbonisation, chemical activation and templating techniques. Control of pore size distribution—ranging from micropores (<2 nm) for charge storage to mesopores (2–50 nm) for ion transport—underpins high specific capacitance and rapid charge–discharge kinetics. Heteroatom doping (notably nitrogen, oxygen and phosphorus) further tailors surface wettability and pseudocapacitive contributions. Typical synthesis routes employ KOH, H₃PO₄ or ZnCl₂ activation, hydrothermal pretreatment or salt-templating to yield hierarchical architectures with specific surface areas often exceeding 1500 m² g⁻¹. These materials routinely achieve specific capacitances above 300 F g⁻¹ in aqueous electrolytes, energy densities up to 50 Wh kg⁻¹ and excellent cycle stability (>90% retention over 5000 cycles). Beyond laboratory metrics, biomass-derived carbons offer circular-economy benefits by valorising waste streams and reducing reliance on fossil precursors. Recent efforts have addressed practical barriers—such as thick electrode fabrication for high areal capacitance, flexible binder-free membranes for wearable devices and scale-up of activation processes—paving the way for commercial and grid-scale energy-storage applications.

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Biomass-Derived Electrode Materials for Supercapacitor Applications publication trend

The graph below shows the total number of articles in biomass-derived electrode materials for supercapacitor applications across all publications each year (not limited to Nature Index journals).

Technical terms

Supercapacitor: An electrochemical energy‐storage device that stores charge through electrostatic separation of ions at electrode–electrolyte interfaces, offering high power density and long cycle life.

Electrical double layer capacitance: Charge storage mechanism arising from separation of electronic charge in the electrode and ionic charge in the electrolyte within nanometre-scale pores.

Activated carbon: Carbon material with high surface area and porosity, produced by chemical or physical activation of carbonaceous precursors.

Specific capacitance: The capacitance per unit mass of electrode material, typically expressed in farads per gram (F g⁻¹).

Pore size distribution: The range and relative volume of pores in a porous material, classified as micropores (<2 nm), mesopores (2–50 nm) or macropores (>50 nm).

References

1. Biomass-derived renewable carbon materials for electrochemical energy storage. Materials Research Letters (2016).
2. Wood-derived biochar as thick electrodes for high-rate performance supercapacitors. Biochar (2022).
3. Synthesis of porous carbon material based on biomass derived from hibiscus sabdariffa fruits as active electrodes for high-performance symmetric supercapacitors. RSC Advances (2021).
4. Coconut Shell-Derived Activated Carbon for High-Performance Solid-State Supercapacitors. Energies (2021).