Enzymatic Biofuel Cell Water Control for Stable Fuel Concentration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biofuel cells face instability in power generation due to varying fuel concentrations in the liquid, affecting their output stability, especially in wearable or single-use devices.
Innovation Solution
A power generation device with an anode and cathode, where the anode contains an enzyme to promote fuel oxidation, and the device includes water in an amount of 10% or less by mass, allowing for stable operation by supplying a liquid that maintains a fuel concentration of 0.01 to 10 mol/dm3, and optionally includes a catalyst for oxygen reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a dry power generation device is used for wearable or single-use applications, then ease of operation and portability are improved, but output stability deteriorates due to varying fuel concentration in supplied liquid
Solution Approach 1:
The patent applies preliminary action by pre-loading the fuel into the device structure before use. The fuel is stored in a reservoir and automatically supplied to the reaction chamber, eliminating the need for users to handle concentrated fuel solutions. This preliminary preparation ensures consistent fuel delivery and stable output while maintaining ease of operation.
Solution Approach 2:
The patent uses an intermediary mechanism (fuel reservoir and controlled delivery system) between the stored fuel and the reaction chamber. This intermediary ensures that fuel is supplied at a controlled rate and concentration, stabilizing the output while keeping the device portable and easy to operate.
2Power
If high concentration of fuel is used in the power generation device, then power output is improved, but measurement precision of substance concentration deteriorates
Solution Approach 1:
The patent applies local quality by creating different functional zones with different fuel concentrations. The fuel reservoir stores concentrated fuel for efficient power generation, while the delivery system dilutes it to appropriate concentrations for the reaction chamber. This spatial variation in concentration allows both high power output and precise concentration measurement in different locations.
Solution Approach 2:
The patent uses parameter changes by dynamically adjusting the fuel concentration through controlled delivery from the reservoir. The system can vary the concentration parameter to optimize for either power generation or measurement precision depending on the operational mode, resolving the contradiction between these two requirements.
3Ease of operation
If water content in the power generation device is increased to improve operation, then device complexity increases due to water management requirements
Solution Approach 1:
The patent extracts the water management function from the core power generation mechanism. By separating the aqueous fuel solution storage from the reaction chamber and using a simple delivery system, the design minimizes water management complexity while maintaining operational stability. The water is supplied as part of the fuel solution rather than as a separate management system.
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 device achieves excellent output stability and enables concentration measurement of substances in liquids, providing a reliable power source for wearable and single-use applications.
Implementation Method 1
the anode contains an enzyme that promotes oxidation of the fuel. Electrons are derived from the anode upon oxidation of the fuel
Implementation Method 2
the cathode comprises a catalyst that promotes reduction of oxygen. electrons... delivered to the cathode, thereby causing reduction of oxygen to generate water
Implementation Method 3
the anode contains an enzyme that promotes oxidation of the fuel
Data Source
AI summary
A power generation device, comprising a fuel, an anode and a cathode, the anode comprising an enzyme that promotes oxidation of the fuel, and the power generation device containing more water when generating power than when not generating power.