Enzyme Fuel Cell with Electron Mediator for High Efficiency
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Solution Overview
Problem
Current bio-fuel cells do not produce sufficient output due to inefficient energy conversion, relying on unnecessary reactions and requiring expensive catalysts and high-temperature processing.
Innovation Solution
A fuel cell design with enzymes immobilized on the cathode or anode, featuring a laminate structure with multiple proton conductors and current collectors, using enzymes like oxidase and coenzyme oxidase to decompose fuels such as glucose or polysaccharides, and an electron mediator to enhance energy conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If microorganisms are used to generate electric energy, then the fuel cell can operate under mild conditions at room temperature, but the energy conversion efficiency is insufficient due to unnecessary reactions
Solution Approach 1:
The patent segments the metabolic pathway into specific enzymatic reactions by using isolated enzymes (such as oxidase and coenzyme oxidase) instead of whole microorganisms. This segmentation allows only the desired energy-generating reactions to occur, eliminating unnecessary metabolic side reactions and improving energy conversion efficiency while maintaining operation at room temperature
Solution Approach 2:
The patent introduces an electron mediator to facilitate electron transfer from the enzyme reaction to the electrode. This intermediary component enables efficient energy conversion by bridging the enzymatic reaction and the electrical circuit, improving overall energy conversion efficiency without requiring high temperatures
2Loss of energy
If conventional fuel cells use precious metal catalysts, then the energy conversion is efficient, but the device becomes expensive
Solution Approach 1:
The patent replaces expensive precious metal catalysts with enzymes that can be immobilized on electrode surfaces. These enzymatic catalysts are significantly cheaper than platinum or other precious metals, reducing the quantity of expensive substances required while maintaining efficient energy conversion through the enzyme-mediated reaction pathway
Solution Approach 2:
The patent changes the catalytic mechanism from precious metal-based to enzyme-based catalysis. This parameter change in the catalyst type enables efficient energy conversion at lower costs, as enzymes provide effective catalytic activity without requiring expensive precious metals
3Power
If conventional fuel cells are designed for high power output, then they can meet energy demands, but they require high-temperature processing and complex structures
Solution Approach 1:
The patent uses a laminate structure that segments the fuel cell into multiple functional layers (electrodes, proton conductors, enzyme layers). This segmentation allows for simplified manufacturing and assembly while achieving high power output through the efficient enzymatic reactions in each layer, reducing overall structural complexity
Solution Approach 2:
The patent employs composite structures combining electrodes with immobilized enzymes and proton-conducting membranes. These composite materials integrate multiple functions (catalysis, proton transport, electrical conduction) into single components, reducing the number of separate parts needed and simplifying the overall device structure while maintaining high power output
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 design significantly increases output by promoting desired reactions, reducing the need for precious metals and high-temperature processing, making the fuel cell more efficient and suitable for mobile applications.
Implementation Method 1
at least either of its cathode or anode has an enzyme as a catalyst immobilized thereon
Implementation Method 2
The anode is supplied with fuel (hydrogen), which is oxidized and decomposed into electrons and protons (H+)
Implementation Method 3
an electrolyte (proton conductor) interposed between them... the latter moving to the cathode through the electrolyte
Implementation Method 4
electrons from the anode through an external circuit... to give H2O
Implementation Method 5
Reaction takes place on the cathode between oxygen, protons, and electrons to give H2O
Data Source
AI summary
A fuel cell and an electronic device equipped therewith are disclosed. The fuel cell is of the type having a cathode and an anode facing each other with a proton conductor interposed therebetween, with at least either of the cathode or anode having an enzyme as a catalyst immobilized thereon, wherein at least a first cathode, a first proton conductor, an anode, a second proton conductor, and a second cathode are sequentially placed thereon, and in fuel is held in contact with at least part of the anode.