Oxygen Reduction Catalyst Composition to Suppress Layer Cracking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing catalysts for electrochemical oxygen reduction face issues with cracking of the catalyst layer, leading to reduced durability and yield, when organic nitrogen compounds are added as additives, due to acid-base interactions with the binder, which inhibit the binding function and promote cracking.
Innovation Solution
A catalyst comprising metal particles with oxygen reduction activity, an organic nitrogen compound as an additive with basic functional groups, and a binder with acidic functional groups, where the ratio of total base functional groups to total acid functional groups is controlled to be greater than zero and less than or equal to 6.82, to suppress cracking and enhance durability and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organic nitrogen compound is added as an additive to improve catalyst performance, then oxygen reduction activity is enhanced, but cracking of the catalyst layer occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ratio of basic functional groups in the organic nitrogen compound to acidic functional groups in the binder within the range of 0.01 to 6.82. This quantitative parameter adjustment optimizes the acid-base interaction to enhance oxygen reduction activity while preventing catalyst layer cracking, thus resolving the contradiction between activity improvement and structural integrity.
Solution Approach 2:
The patent employs composite materials by formulating a catalyst system that integrates metal particles, organic nitrogen compound additives with specific basic functional groups, and binders with acidic functional groups. This composite structure creates synergistic effects where the controlled acid-base interactions between components enhance catalytic performance while maintaining layer integrity, addressing both the activity enhancement and cracking prevention requirements.
2Stability of the object's composition
If the ratio of base functional groups to acid functional groups is increased to enhance binding function, then catalyst layer stability improves, but excessive ratio may reduce catalyst performance
Solution Approach 1:
The patent resolves this contradiction through parameter optimization by establishing a specific ratio range (0.01 to 6.82) of basic to acidic functional groups. This quantitative control ensures sufficient acid-base interactions for stable binding and layer integrity, while preventing excessive ratio that would diminish catalytic activity, thus achieving optimal balance between stability and performance.
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 controlled ratio of functional groups effectively suppresses catalyst layer cracking, thereby increasing the durability and yield of the product, and improves the binding function between metal particles and the support, preventing membrane-electrode assembly failure.
Implementation Method 1
when organic nitrogen compound is added as an additive to a catalyst having oxygen reduction activity to improve a catalyst performance, cracking of a catalyst layer may occur... the ratio (base point amount/acid point amount) of a total base functional group amount of the additive to a total acid functional group amount of the binder is greater than zero and equal to or less than 6.82
Implementation Method 2
catalysts for electrochemical oxygen reduction... a metal particle having an oxygen reduction activity
Data Source
AI summary
A catalyst comprising: metal particles having an oxygen reducing activity; an additive having a basic functional group; and a binder having an acidic functional group, wherein the additive is at least one organic nitrogen compound, and a ratio (base point amount/acid point amount) of the total base functional group amount of the additive to the total acidic functional group amount of the binder is greater than 0 and less than or equal to 6.82.