Fuel Cell Anode with High Capacity Carbon for Transient Current
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Solution Overview
Problem
Fuel cells face limitations in maximum operating current and performance degradation due to transient current inrush peaks and stop/start cycles, which require excessive sizing and lead to material corrosion, and existing solutions like additional capacitive layers increase electrical losses and contact resistance.
Innovation Solution
The anode composition is enhanced with a mixture of proton conductor, platinum supported by carbon powder, and additional carbon with high specific surface area to increase intrinsic capacity without altering catalytic performance or significantly increasing cost, balancing anodic and cathodic capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additional capacitive layers are added to increase anodic capacity, then the maximum operating current and transient current delivery capability are improved, but electrical losses and contact resistance increase
Solution Approach 1:
The patent extracts the capacitive function from separate additional layers and integrates it directly into the anode active layer by incorporating conductive carbon materials and proton-conducting polymers into the existing electrode composition, thereby eliminating the need for separate capacitive layers and reducing contact resistance
Solution Approach 2:
The patent merges the capacitive function with the catalytic function by combining carbon materials that provide both electrical conductivity/capacitance and catalytic activity for the oxygen reduction reaction, allowing the anode to simultaneously perform electrocatalysis and energy storage functions within the same layer
2Duration of action of moving object
If additional capacitive layers are added to extend extinction time during air shortages, then the duration of action is improved, but device complexity increases
Solution Approach 1:
The patent combines the capacitive energy storage function with the existing anode structure by incorporating conductive carbon materials and proton-conducting polymers into the anode active layer, eliminating the need for separate capacitive layers and simplifying the overall device structure
Solution Approach 2:
The patent makes the anode multi-functional by enabling it to simultaneously perform catalysis for the oxygen reduction reaction and store electrical energy through its capacitive properties, thereby extending extinction time during air shortages without adding separate components
3Quantity of substance
If the anode composition is enhanced with additional carbon materials, then the intrinsic capacity is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent modifies the compositional parameters of the anode by incorporating conductive carbon materials and proton-conducting polymers in optimized ratios, changing the physical and chemical properties of the anode to achieve higher intrinsic capacity while maintaining manufacturability through established coating techniques
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 approach allows for substantial increase in anodic capacity while maintaining performance and reducing electrical losses, extending extinction time during air shortages and maintaining electrochemical performance without adding additional layers or contact resistance.
Implementation Method 1
At the anode, dihydrogen used as fuel is oxidized to produce protons crossing the membrane. The electrons produced by this reaction migrate to a flow plate, then pass through an electrical circuit external to the cell to form an electrical current.
Implementation Method 2
The membrane thus forms a proton conductor. Each cell comprises an electrolytic membrane allowing only the passage of protons and not the passage of electrons.
Implementation Method 3
At the cathode, oxygen is reduced and reacts with protons to form water.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a fuel cell comprising a membrane/electrode assembly (14) that includes: - a proton exchange membrane (2); - an anode (31) which is in contact with a first surface of the membrane and which contains a mixture including a proton conducting polymer and platinum supported by carbon powder; - said mixture further includes additional carbon which does not support any catalyst and which has a minimum specific surface area BET of 200m²/g. The membrane/electrode assembly (14) has a first active region (21) that is covered by the anode (31), and a first joining region (22) that is not covered by the anode (31).