Core-Shell Pd-Pt Fuel Cell Catalyst
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current solid polymer electrolyte fuel cell (PEFC) catalysts, such as Pt/C, have high platinum content costs, and while core-shell catalysts reduce platinum usage, they require further improvement in catalytic activity to lower PEFC costs effectively.
Innovation Solution
A core-shell catalyst with a Pd core and Pt shell supported on conductive carbon, where the Pd to carbon ratio is optimized to enhance catalytic activity, allowing for more efficient use of platinum and reducing the amount of platinum required, thereby lowering the overall cost of the fuel cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a core-shell catalyst with Pd core and Pt shell is used, then the amount of platinum required is reduced, but the catalytic activity is insufficient
Solution Approach 1:
The patent optimizes the atomic ratio of Pd to carbon in the core part, specifically setting it to 0.8 or more, to enhance the catalytic activity of the core-shell catalyst while maintaining reduced platinum content. This parameter adjustment allows the Pd core to contribute more effectively to the overall catalytic performance.
Solution Approach 2:
The patent creates a composite catalyst structure consisting of a Pd core supported on carbon with a Pt shell. This composite material combines the advantages of Pd (lower cost, good catalytic activity) with Pt (high catalytic activity, stability), achieving a balance between cost reduction and performance maintenance.
2Reliability
If Pt/C catalyst is used, then the catalytic activity is high, but the preparation cost is high due to large proportion of noble metal
Solution Approach 1:
The patent replaces part of the expensive Pt in conventional Pt/C catalysts with cheaper Pd in a core-shell structure. The Pd core serves as a cost-effective alternative that maintains catalytic functionality, thereby reducing the overall noble metal content and preparation cost while preserving sufficient catalytic activity.
Solution Approach 2:
The patent applies Pt selectively in the shell layer rather than throughout the entire catalyst particle, concentrating the expensive noble metal only where it is most needed for catalytic activity. The core region uses cheaper Pd, creating a spatial distribution of materials that optimizes both cost 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 optimized Pd to carbon ratio in the core-shell catalyst structure improves catalytic activity, leading to a more cost-effective PEFC by maximizing the use of platinum and reducing the need for expensive platinum components.
Implementation Method 1
a core part (4) formed on the support (2), and a shell part (6) formed on the core part (4)... the electrode catalyst (10) has a structure that the core part (4) is supported on the support (2), and the core part (4) is covered with the shell part (6)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
To provide electrode catalyst (core-shell catalyst) having an excellent catalyst activity which contributes to lower the cost of the PEFC. The electrode catalyst has catalyst particles supported on a support. The catalyst particle has a core part containing simple Pd and a shell part containing simple Pt. A percentage RC (atom%) of the carbon of the support and a percentage RPd (atom%) of the simple Pd in an analytical region near a surface measured by X-ray photoelectron spectroscopy (XPS) satisfy the conditions of the following equation (1): 2.15 ≤ [100 x RPd / (RPd+RC)].