Reversible Fuel Cell Oxygen Electrode with Porous Platinum Layer
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Solution Overview
Problem
Reversible fuel cells require a high loading amount of noble metal electrochemical catalysts, particularly platinum and iridium oxide, which increases system costs and results in unsatisfactory water electrolysis and fuel cell performance due to slow oxygen reduction and evolution reactions.
Innovation Solution
A reversible fuel cell oxygen electrode is developed by electrodeposition of IrO2 on a porous carbon material, followed by the application of a porous platinum layer, reducing the loading amount of noble metals and improving mass transport of water and oxygen, while maintaining catalyst activity and reducing carbon corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high loading amount of noble metal electrochemical catalyst is used, then fuel cell performance and water electrolysis performance are improved, but system costs are increased
Solution Approach 1:
The patent employs porous carbon materials with optimized pore structures to increase the effective surface area for catalytic reactions. The porous structure allows for better mass transport of reactants and products while providing high surface area for the noble metal catalysts, thereby improving fuel cell and water electrolysis performance without proportionally increasing noble metal loading.
Solution Approach 2:
The patent uses composite catalyst structures combining noble metals (Pt, IrO2) with carbon-based materials and other functional components. These composite structures enhance the catalytic activity and utilization efficiency of the noble metals, allowing for reduced noble metal content while maintaining or improving overall cell performance.
2Reliability
If a high loading amount of noble metal electrochemical catalyst is used, then fuel cell performance and water electrolysis performance are improved, but preparation costs are increased
Solution Approach 1:
The porous carbon substrate provides high surface area that reduces the amount of noble metal catalyst needed to achieve the same catalytic activity. This directly lowers material costs while the optimized pore structure ensures efficient mass transport for water electrolysis reactions.
Solution Approach 2:
The patent optimizes various parameters including catalyst loading amount, particle size distribution, and pore structure characteristics to achieve cost-effective performance. By carefully controlling these parameters, the patent reduces noble metal content while maintaining water electrolysis performance through enhanced catalyst utilization efficiency.
3Productivity
If mass transport of water and oxygen is improved, then reversible fuel cell performance is improved, but electrode structure complexity is increased
Solution Approach 1:
The patent uses porous carbon materials with optimized pore size distributions to enhance mass transport of water and oxygen. The porous structure naturally facilitates fluid flow and gas diffusion without requiring complex external structures, improving reversible fuel cell performance through inherent mass transport enhancement.
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 solution achieves excellent reversible fuel cell and water electrolysis performance with reduced noble metal content, lower preparation costs, and enhanced durability, maintaining high activity and efficiency even at reduced catalyst loading.
Implementation Method 1
In one embodiment, IrO2 may be electrodeposited on a porous carbon material
Implementation Method 2
platinum is applied onto the electrodeposited porous carbon material to form a porous platinum layer
Implementation Method 3
improving the mass transport of water and oxygen
Implementation Method 4
improving the mass transport of water and oxygen
Data Source
AI summary
Disclosed are a reversible fuel cell oxygen electrode in which IrO2 is electrodeposited and formed on a porous carbon material and platinum is applied thereon to form a porous platinum layer, a reversible fuel cell including the same, and a method for preparing the same. According to the corresponding reversible fuel cell oxygen electrode, as the loading amounts of IrO2 and platinum used in the reversible fuel cell oxygen electrode can be lowered, it is possible to exhibit excellent reversible fuel cell performances (excellent fuel cell performance and water electrolysis performance) by improving the mass transport of water and oxygen while being capable of reducing the loading amounts of IrO2 and platinum. Further, it is possible to exhibit a good activity of a catalyst when the present disclosure is applied to a reversible fuel cell oxygen electrode and to reduce corrosion of carbon.