Mesoporous Pt Alloy Electrode Catalyst for Ionomer Poisoning
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Solution Overview
Problem
Catalytic performance of catalysts in fuel cells is hindered by poisoning from ionomers, and existing solutions do not adequately enhance catalytic activity, particularly in catalysts with platinum and other metals supported in mesoporous materials.
Innovation Solution
An electrode catalyst with platinum and a different metal, such as cobalt, supported in mesoporous materials with an L10 structure and a specific pore size range, reducing ionomer contact and enhancing catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a catalyst metal is contacted with an ionomer to supply protons, then proton supply is enhanced, but the catalyst metal is poisoned by the ionomer and catalytic performance is reduced
Solution Approach 1:
The patent employs a mesoporous core structure with controlled pore sizes (1-25 nm) and pore volumes (1.0-3.0 cm³/g) to support catalyst metal particles. The porous structure allows selective access: reaction gases and protons can reach the catalyst particles through the pores, while the ionomer is restricted from直接接触 the catalyst metal particles, thereby preventing poisoning while maintaining proton supply functionality
Solution Approach 2:
The mesoporous core material acts as an intermediary between the ionomer and catalyst metal particles. It provides a physical barrier that mediates the interaction, allowing necessary mass transport (protons and reaction gases) while blocking harmful direct contact between the ionomer and catalyst metal surface
2Productivity
If an L10 structure is formed in alloy catalyst to enhance catalytic activity, then catalytic activity is improved, but the structure requires precise control of pore size and volume
Solution Approach 1:
The patent specifies precise parameter ranges for the mesoporous core: pore size of 1-25 nm and pore volume of 1.0-3.0 cm³/g. These parameter specifications are critical for achieving the L10 structured alloy catalyst formation and maintaining high catalytic activity while controlling ionomer access. The L10 structure itself represents a specific crystalline phase with ordered atomic arrangement that provides enhanced catalytic properties
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 catalyst achieves higher catalytic activity and durability, leading to improved power generation performance in fuel cells by minimizing ionomer poisoning and optimizing reaction gas supply.
Implementation Method 1
catalyst metal particles which are supported in at least an inner portion of the mesoporous material
Implementation Method 2
catalyst metal particles which contain platinum and a metal different from platinum... for subjecting a fuel gas containing hydrogen and an oxidant gas containing oxygen to an electrochemical reaction
Data Source
AI summary
An electrode catalyst according to the present disclosure includes a mesoporous material and catalyst metal particles which are supported in at least an inner portion of the mesoporous material and which contain platinum and a metal different from platinum. The mesoporous material has mesopores having a mode radius of greater than or equal to 1 nm and less than or equal to 25 nm and a pore volume of greater than or equal to 1.0 cm3/g and less than or equal to 3.0 cm3/g. The catalyst metal particles which are supported have an L10 structure. The proportion of the L10 structure is greater than 0.25.