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Textile-Based Membraneless Microfluidic Double-Inlet Hybrid Microbial-Enzymatic Biofuel Cell.

Jinyong Kim¹, Hui Geon Kong¹, Yoomin Ahn¹

¹Department of Mechanical Engineering, BK21 FOUR ERICA-ACE Center, Hanyang University, Ansan, Gyeonggi-do 15588, Republic of Korea.

ACS Applied Materials & Interfaces

|August 6, 2024

Summary

Researchers developed a flexible, textile-based hybrid biofuel cell using microbial and enzymatic catalysts. This wearable power source offers improved performance for sustainable microscale energy generation.

Keywords:

biocathode colaminar flow fabric substrate micromachined monolithic wearable fuel cell

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Area of Science:

Bioelectronics
Renewable Energy
Materials Science

Background:

Microbial enzymatic fuel cells (MEFCs) offer a sustainable energy source but face challenges with power density and stability.
Textile-based platforms are attractive for wearable electronics due to their flexibility and biocompatibility.
Addressing cathode overpotential loss is crucial for enhancing MEFC performance.

Purpose of the Study:

To develop a textile-based, colaminar flow hybrid microbial-enzymatic biofuel cell (HEMFC).
To utilize *Shewanella* MR-1 as an anode biocatalyst and a glucose oxidase/horseradish peroxidase system for the cathode.
To optimize HEFMC performance through investigation of electrode materials, catalyst parameters, and fuel concentration.

Main Methods:

Fabrication of microchannels using silk screen printing with Ecoflex on flexible textile substrates.
Screen printing of electrodes using conductive polymers (PEDOT:PSS) and carbon nanotube mixtures.
Implementation of a Y-shaped, double-inlet channel design for colaminar flow.
Systematic investigation of anode/cathode materials, catalyst loading, and substrate concentration.

Main Results:

Achieved a peak power density of 44.9 μW cm^-2 and a maximum current density of 388.9 μA cm^-2.
Demonstrated superior performance compared to previously reported textile- or paper-based microscale microbial fuel cells.
Successfully integrated microbial and enzymatic catalysts onto a flexible, biocompatible textile platform.

Conclusions:

The developed textile-based HEFMC represents a promising advancement in wearable microscale power sources.
The hybrid approach effectively addresses cathode overpotential losses, enhancing overall efficiency.
This technology offers a sustainable, body-friendly energy solution with potential for various biomedical applications.