Polyol-Processed Carbon-Supported Catalyst for Fuel Cells
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing catalysts with platinum particles dispersed in carbon supports face issues with increased particle size leading to decreased catalytic activities and performance due to excessive coverage by carbon particles, resulting in reduced fuel cell efficiency.
Innovation Solution
A high-concentration, high-dispersity carbon-supported catalyst is developed using a polyol process to form mono-layer and multi-layer structures of metal catalyst particles with precise control over particle size and loading, enhancing catalytic efficiency by optimizing the dispersion and impregnation of platinum particles on a carbon-based support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If metal catalyst particles are dispersed in carbon support using conventional methods, then catalyst loading can be increased, but particle size increases and catalytic activity decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming metal particles through polyol reduction before impregnating them onto the carbon support. This preliminary particle formation ensures uniform size distribution (3-5 nm) is achieved before the impregnation step, preventing subsequent particle growth that would occur with conventional direct impregnation methods.
Solution Approach 2:
The patent utilizes parameter changes by controlling the polyol reduction process parameters (temperature, time, polyol-to-metal ratio) to precisely control particle size. By adjusting these parameters, the invention achieves optimal particle sizes of 3-5 nm while maintaining high catalyst loading, directly resolving the contradiction between quantity and precision.
2Quantity of substance
If metal catalyst particles are dispersed in carbon support, then catalyst loading increases, but carbon coverage becomes excessive and fuel cell performance decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming metal particles through polyol reduction before impregnating them onto the carbon support. This preliminary particle formation ensures uniform size distribution (3-5 nm) is achieved before the impregnation step, preventing subsequent particle growth that would occur with conventional direct impregnation methods.
Solution Approach 2:
The patent utilizes parameter changes by controlling the polyol reduction process parameters (temperature, time, polyol-to-metal ratio) to precisely control particle size. By adjusting these parameters, the invention achieves optimal particle sizes of 3-5 nm while maintaining high catalyst loading, directly resolving the contradiction between quantity and precision.
3Reliability
If particle size is reduced to maintain catalytic activity, then catalytic efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the polyol reduction process to automatically form uniform metal particles without requiring complex external control mechanisms. The polyol acts as both reducing agent and stabilizer, enabling self-limited particle growth to the optimal 3-5 nm size range through inherent chemical control rather than complex physical constraints.
Solution Approach 2:
The patent utilizes parameter changes by controlling the polyol reduction process parameters (temperature, time, polyol-to-metal ratio) to precisely control particle size. By adjusting these parameters, the invention achieves optimal particle sizes of 3-5 nm while maintaining high catalyst loading, directly resolving the contradiction between quantity and precision.
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 improved catalytic activities and energy density in fuel cells by maintaining optimal particle sizes and loadings, leading to enhanced fuel efficiency and performance characteristics.
Implementation Method 1
metal catalyst particles, such as platinum, are impregnated on a surface of a carbon-based catalyst support through a polyol process
Implementation Method 2
catalyst metal particles are highly dispersed on a carbon-based catalyst support so as to form a mono-layer structure or multi-layer structure
Implementation Method 3
the catalyst in the anode decomposes hydrogen or methanol to form protons which pass through the proton conductive membrane and react with oxygen in the presence of the catalyst in the cathode, as part of an overall process that generates electricity
Implementation Method 4
the catalyst in the anode decomposes hydrogen or methanol to form protons which pass through the proton conductive membrane and react with oxygen in the presence of the catalyst in the cathode, as part of an overall process that generates electricity
Data Source
AI summary
Provided are a supported catalyst, an electrode including the same, and a fuel cell using the electrode. The supported catalyst includes a carbon-based catalyst support and metal catalyst particles having an average diameter of 3.5 to 5 nm and an amount of 80 to 90 parts by weight based on 100 parts by weight of the supported catalyst in a multi-layer structure adsorbed on a surface of the carbon-based catalyst support. In the supported catalyst of the present invention, as small metal catalyst particles with an average diameter of 3.5 to 5 nm are dispersed with high concentration, high dispersion, and the multi-layer structure, catalytic efficiency is increased. A fuel cell having improved energy density and fuel efficiency characteristics can be prepared using an electrode formed using the supported catalyst.