Grafted Catalyst Chains for Deep-Pore Reactant Transport
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Solution Overview
Problem
Existing electrochemical cells face challenges in catalyst efficiency and longevity due to steric hindrance and difficulty in reaching all catalyst sites, especially in deep pores and crevices, which affects reactant transport and ionic conductivity.
Innovation Solution
Grafting polymeric chains with ionic functional groups to the catalyst particles at less active areas or undercoordinated facets, which act as a reactant bridge between the catalyst and ionomer, enhancing conductivity and reactant transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polymeric chains are grafted to less active areas of catalyst particles, then reactant transport and ionic conductivity are improved, but catalyst active surface area is reduced
Solution Approach 1:
The patent applies local quality by selectively grafting polymeric chains only to less active areas or undercoordinated facets of catalyst particles, preserving the highly active facets for catalysis while utilizing less active regions for reactant transport and ionic conductivity enhancement
Solution Approach 2:
The grafted polymeric chains serve as intermediary structures that bridge the catalyst particles and ionomer, facilitating reactant transport and ionic conductivity through the polymer chains that extend from the catalyst surface into the ionomer matrix
2Reliability
If polymeric chains are grafted to enhance conductivity, then catalyst longevity is improved, but device complexity increases
Solution Approach 1:
The patent changes the chemical and structural parameters of the catalyst surface by grafting polymeric chains with specific ionic functional groups, transforming the catalyst surface properties to enhance longevity through improved ionic conductivity and reactant transport
Solution Approach 2:
The patent creates a composite structure by combining catalyst particles with grafted polymeric chains, forming a hybrid material that integrates the catalytic function with enhanced ionic conductivity and reactant transport capabilities
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 grafted polymeric chains improve catalyst efficiency and longevity by maintaining reactant transport and ionic conductivity even under dry conditions, and by localizing free radical scavengers and preventing catalyst poisoning.
Implementation Method 1
The plurality polymeric chains operating as a reactant bridge between the catalyst and ionomer
Implementation Method 2
A catalyst layer including a porous catalyst support, a catalyst deposited on the catalyst support, and a plurality of polymeric chains grafted to the catalyst
Data Source
AI summary
Catalyst with ionomer-like polymeric chains grafted thereto are disclosed. The ionomer-like chains provide a reactant bridge for between the catalyst and ionomer such as in a fuel cell, especially when deposited in deep pores or cervices. In a refinement, the polymeric chains are deposited on less active facets of the catalyst.