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Sweet Side Streams: Sugar Beet Pulp as Source for High-Performance Supercapacitor Electrodes.

Julian Selinger^1,2, Kristoffer Meinander², Benjamin P Wilson³

¹Institute of Bioproducts and Paper Technology, Graz University of Technology, Inffeldgasse 23, 8010 Graz, Austria.

|February 5, 2024

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Beet pulp waste from sugar production can be converted into porous carbon for high-performance supercapacitors. This upcycling approach offers an eco-friendly solution for energy storage, outperforming commercial materials.

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Area of Science:

Materials Science
Electrochemistry
Sustainable Chemistry

Background:

Valorization of lignocellulosic waste streams is crucial for economic and ecological efficiency.
Sugar beet processing generates large quantities of pulp, a material with underutilized potential.
Developing upcycling strategies for industrial byproducts is essential for a circular economy.

Purpose of the Study:

To investigate beet pulps as a raw material for supercapacitor electrodes.
To explore the efficient conversion of beet pulp into activated, porous carbon materials.
To evaluate the performance of supercapacitors made from beet pulp-derived carbons using aqueous electrolytes.

Main Methods:

Beet pulps from sugar manufacturing were processed into activated carbons.
Characterization of carbon materials, including surface area and pore size distribution.
Fabrication of supercapacitor electrodes and electrochemical performance testing in aqueous electrolytes (KOH and H2SO4).

Main Results:

Activated carbons with high surface areas (up to 2600 m² g⁻¹) and optimized pore structures were produced.
Pore dimensions were found to be suitable for ion transport in aqueous electrolytes.
Supercapacitors achieved high capacitance (193 F g⁻¹ in H2SO4, 177 F g⁻¹ in KOH), exceeding commercial benchmarks.

Conclusions:

Beet pulp waste streams represent a valuable, sustainable resource for high-performance energy storage.
The developed method offers an efficient upcycling pathway for industrial byproducts.
This research highlights the potential of agricultural waste in advancing supercapacitor technology.