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Integrated Microfluidic Flow-Through Microbial Fuel Cells.

Huawei Jiang¹, Md Azahar Ali¹, Zhen Xu¹

¹Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA.

Scientific Reports

|January 26, 2017

Summary

This summary is machine-generated.

This study introduces a miniaturized microbial fuel cell using graphene foam and microfluidics. This innovative design enhances electricity generation efficiency and reduces resource consumption.

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Area of Science:

Bioengineering
Materials Science
Electrochemistry

Background:

Microbial fuel cells (MFCs) offer a sustainable route for bioelectricity generation.
Traditional MFC designs often face limitations in power density and efficiency.
Microfluidic systems present opportunities for enhanced mass transport and control in electrochemical devices.

Purpose of the Study:

To develop and characterize a miniaturized microbial fuel cell with a microfluidic flow-through anode.
To investigate the impact of three-dimensional graphene foam as an anode material on MFC performance.
To evaluate the efficiency of nutrient utilization and response time in the novel MFC design.

Main Methods:

Fabrication of a microfluidic chamber packed with 3D graphene foam serving as the anode.
Colonization of the graphene foam anode with Shewanella oneidensis.
Implementation of a pressure-driven flow-through system for nutrient delivery to the anode.
Measurement of power density (volume and surface) and comparison with a non-flow-through MFC.

Main Results:

Achieved a volume power density of 745 μW/cm³ and a surface power density of 89.4 μW/cm².
Demonstrated a 16.4-fold reduction in medium consumption and a 4.2-fold decrease in response time compared to a non-flow-through device.
Sustained high nutrient utilization and rapid electricity generation due to efficient mass transport within the graphene foam anode.

Conclusions:

The graphene foam-enabled microfluidic flow-through MFC design significantly enhances performance.
This approach allows for efficient microbial conversion of substrates to electricity with reduced space and resource requirements.
The developed MFC technology shows promise for smaller, more efficient bioelectrochemical systems.