Customizable design strategies for high-performance bioanodes in bioelectrochemical systems

Area of Science:

• Electrochemistry
• Materials Science
• Biotechnology

Background:

• Bioelectrochemical systems (BESs) offer promise for renewable energy and wastewater treatment.
• Improving BES performance is crucial, but current bioelectrode strategies are fragmented and lack flexibility.
• Existing methods struggle to tailor electrode properties for diverse applications.

Purpose of the Study:

• To develop a facile and adaptable electrode design strategy for enhancing BES performance.
• To create a customized graphene-based electrode with tunable physicochemical and structural properties.
• To demonstrate the applicability of this strategy in various BES applications.

Main Methods:

• Integration of three-dimensional printing technology with functionalized modular electrode materials.
• Fabrication of a graphene-based electrode featuring hierarchical pores.
• Functionalization of the electrode with ferric ions and magnetite nanoparticles.

Main Results:

• Achieved a high volumetric current density of 10,608 ± 1,036 A/m³.
• This represents the highest volumetric current density reported for pure Geobacter sulfurreducens in BESs.
• Demonstrated efficient mass and electron transfer properties of the fabricated electrode.

Conclusions:

• The proposed electrode design strategy is facile and adaptable for BES applications.
• This approach offers a practical solution for enhancing BES performance in renewable energy and wastewater treatment.
• The customized electrode shows significant potential for widespread adoption in existing BES technologies.