Regenerative Electron Acceptor Microbial Fuel Cell for Higher Current Density

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Solution Overview

Problem

Microbial fuel cells face limitations in power generation due to slow oxygen reduction on carbon electrodes, leading to high overvoltage and low current density, despite the potential of high-reduction potential electron acceptors, which affect electricity production efficiency.

Innovation Solution

A microbial fuel cell design incorporating an electron absorber solution with high reduction potential as the catholyte, regenerable through electrolysis, and an organic solution as the anolyte, with a separation membrane to prevent leakage, allowing for efficient energy regeneration and utilization of hydrogen gas produced during electrolysis to enhance power production.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If oxygen is used as electron acceptor in MFCs, then high reduction potential is achieved, but slow reduction rate on carbon electrode surface results in high overvoltage and low current density

Engineering Contradiction:

Improvereduction potentialVSAvoidcurrent density

Core Design Contradiction:

Use of energy by moving objectVSProductivity

Solution Approach 1:

The patent introduces a redox mediator (such as ferricyanide/ferrocyanide couple) that acts as an intermediary between the microorganisms and the electron acceptor. The mediator shuttles electrons from the anode to the cathode, enabling faster electron transfer kinetics and higher current density while maintaining high reduction potential, thus resolving the contradiction between thermodynamic efficiency and kinetic performance

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If high-reduction potential electron acceptors are used, then electricity production efficiency is improved, but cost increases

Engineering Contradiction:

Improveelectricity production efficiencyVSAvoidcost

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent employs a regenerative redox mediator system where the reduced form of the electron acceptor is continuously regenerated through electrochemical oxidation at the cathode. This allows the same electron acceptor to be reused multiple times, significantly reducing the cost per unit of electricity produced while maintaining high electricity production efficiency

Inventive Principle:

Principle #34Discarding and recovering

Solution Approach 2:

The patent uses inexpensive, readily available materials such as ferricyanide/ferrocyanide redox couples instead of expensive noble metal-based electron acceptors. These simple inorganic compounds provide high reduction potential at low cost, making the system economically viable while maintaining high electricity production efficiency

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Power

If electron absorber is continuously used in MFCs, then power generation is maintained, but electron absorber depletes and requires replacement

Engineering Contradiction:

Improvepower generationVSAvoidfuel cell lifespan

Core Design Contradiction:

PowerVSDuration of action of stationary object

Solution Approach 1:

The patent implements a continuous regeneration system where the reduced electron acceptor is continuously oxidized back to its active form at the cathode through electrochemical reactions. This continuous cycling ensures that the electron acceptor never depletes, allowing indefinite power generation and dramatically extending the fuel cell lifespan without requiring replacement of the electron absorber

Inventive Principle:

Principle #20Continuity of useful action

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

The microbial fuel cell achieves high power production at a low cost by regenerating and reusing the electron acceptor, doubling energy utilization from existing systems, and extending fuel cell lifespan, while using organic waste as a low-cost fuel source and hydrogen as a fuel, thereby improving overall energy efficiency and sustainability.

Implementation Method 1

MFCs convert chemical energy stored in biodegradable materials into useful electrical energy

Methodology Applied

Scientific EffectMicrobial metabolism: Fermentation

Implementation Method 2

the reduced posolyte transferred from the cathode chamber is regenerated through electrolysis using external power

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Implementation Method 3

a separation membrane equipped with one or more O-rings is included to prevent leakage

Methodology Applied

Scientific EffectMembrane separation: Semipermeable Membrane

Data Source

PatentUS12261336B2Microbial fuel cell using electron absorber having high reduction potential, and method of generating electric energy using same

Publication Date: 2025.03.25 PARK YONG HAK

AI summary

The present invention relates to a microbial fuel cell using an electron absorber having high reduction potential, and a method of generating electric energy using same, and more specifically, to: a microbial fuel cell in which an electron absorber solution having high reduction potential is used as a reduction electrolyte, an organic solution that is an electron donor is used as an oxidization electrolyte, the reduced reduction electrolyte is regenerated through electrolysis in an electrolysis battery and re-supplied to the reduction electrolyte, a separation membrane provided with one or more O-rings in order to prevent leakage is included, hydrogen gas generated from the electrolysis can be supplied to a fuel cell to generate additional electric energy, such that a large quantity of electric power can be generated cost-efficiently, energy from an existing electricity generation system, such as solar electric energy.