Membraneless Microbial Fuel Cell Stacking for Voltage Scaling
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Solution Overview
Problem
Microbial fuel cells (MFCs) face challenges in scaling up and modularization due to their structure, which includes an electrolyte membrane that increases costs and is prone to contamination, and single MFCs cannot generate sufficient voltage for practical use.
Innovation Solution
An electrolyte-membraneless MFC design featuring a body with a cathode on top and an anode on the bottom, a plate connecting the anode to the cathode, and a substrate-containing solution that allows electrons and hydrogen ions to be transferred without an electrolyte membrane, enabling easy scaling and modularization through in-series and in-parallel stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrolyte membrane is used in the MFC structure, then the system can maintain proper ion transfer and electrical isolation, but the cost increases and the membrane is prone to contamination
Solution Approach 1:
The patent removes the electrolyte membrane from the MFC structure entirely, replacing it with a liquid electrolyte solution that fills the chamber. This extraction eliminates the membrane component that is prone to contamination while maintaining the necessary ion transfer pathways through the liquid medium throughout the entire chamber volume.
2Reliability
If an electrolyte membrane is used to ensure proper function, then the system operates reliably, but the manufacturing cost increases
Solution Approach 1:
The membrane is completely removed from the system, eliminating the need for expensive membrane materials and their associated manufacturing complexities. The liquid electrolyte solution serves the functional requirements at lower cost.
Solution Approach 2:
The patent replaces the expensive, durable membrane with a liquid electrolyte solution that can be easily replenished. While the liquid electrolyte may need periodic replacement, this approach uses cheaper materials overall and simplifies the manufacturing process.
3Device complexity
If a single MFC is used, then the system is simple, but the voltage generated is insufficient for practical use
Solution Approach 1:
The patent combines multiple MFC units into a stacked configuration where multiple anodes and cathodes are layered vertically. This merging of multiple cells into a single integrated structure increases the total voltage output through series connection while maintaining a compact and relatively simple overall design.
Solution Approach 2:
The patent transitions from a horizontal arrangement of MFCs to a vertical stacking configuration. By utilizing the vertical dimension, multiple cells are combined in a compact space, increasing voltage output without proportionally increasing the footprint or complexity of the system.
4Power
If the MFC structure is scaled up for practical application, then the power output increases, but the structural complexity and difficulty of modularization increase
Solution Approach 1:
The patent divides the large-scale MFC system into modular repeating units, each containing a complete set of anode, cathode, and liquid electrolyte. These standardized modules can be stacked vertically or arranged horizontally to scale up the system while maintaining structural simplicity and ease of assembly.
Solution Approach 2:
Multiple MFC modules are combined into a unified stacked structure where adjacent modules share common components or interfaces. This merging approach allows scaling up power output while reducing the number of separate systems needed, thereby managing structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design allows for the generation of higher voltages and improved power output, overcoming the limitations of single MFCs and reducing the risk of membrane contamination, while maintaining mechanical integrity and cost-effectiveness.
Implementation Method 1
the electrochemically active microorganisms biodegrade the substrate to generate electrons and hydrogen ions
Implementation Method 2
the hydrogen ions passing through the substrate-containing solution to be transferred to the lower surface of the cathode
Implementation Method 3
the electrons being transferred to the cathode through the plate
Data Source
AI summary
Disclosed herein are an electrolyte-membraneless microbial fuel cell, in-series stack thereof, and in-parallel combination thereof. According to various implementation examples, problems relating to scaling up and modularization are overcome, and problems relating to using an electrolyte membrane are solved.