What question did this study set out to answer?

To explore the use of biowaste for developing high-performance supercapacitor electrodes.

March 25, 2026Open Access

Asymmetric Supercapacitor Based on Biomass-Derived Carbon Electrodes Functionalized with NdFeB

Key Points

To explore the use of biowaste for developing high-performance supercapacitor electrodes.
Processed biowaste from breweries to create mesoporous activated carbon (AC) for electrodes.
Synthesized polyaniline (PANI) and integrated it with AC to enhance performance.
Evaluated specific capacitance and retention over 5000 cycles using NdFeB particles.
Assessed performance in an asymmetrical supercapacitor cell.
Achieved a specific capacitance of 173.7 F/g at 1 A/g for the AC-PANI combination.
Maintained 92% capacitance retention after 5000 cycles for AC-PANI.
Demonstrated a specific capacitance of 127 F/g and over 99% retention for NdFeB anode.
The asymmetrical ACN//ACP cell achieved 70% efficiency.

Abstract

Supercapacitors (SCs) are highly attractive energy storage devices, and modern research is focused on using waste materials to reduce environmental impact. This study processed biowaste from local brewery production to produce a highly specific mesoporous activated carbon (AC) for SC electrode scaffolds. Polyaniline (PANI) was synthesized and incorporated into the AC scaffold, thereby enhancing performance. The AC and PANI combination (ACP) achieved a specific capacitance of 173.7 F/g at 1 A/g, with 92% retention after 5000 cycles. Using NdFeB (ACN) particles, the anode showed a specific capacitance of 127 F/g and over 99% retention. An asymmetrical ACN//ACP cell demonstrated promising performance with 70% efficiency. This study highlights the potential of using biowaste for high-performance SC electrodes and the effective synergy between AC and PANI.

Asymmetric Supercapacitor Based on Biomass-Derived Carbon Electrodes Functionalized with NdFeB

Key Points

Abstract

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