Sulfur-Containing Oxycarbonitride Catalyst for Fuel Cell
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional fuel cell catalysts, particularly those using platinum, face issues with corrosion in acidic environments, limited durability, and inefficient utilization of catalyst particles, leading to high costs and reduced performance due to the lack of a uniform three-phase interface for electrochemical reactions.
Innovation Solution
A sulfur-containing oxycarbonitride catalyst with molybdenum, boron, and specific metals like copper or manganese is developed, which forms a stable and porous structure that maintains high oxygen reduction ability and effectively participates in electrochemical reactions across the catalyst layer, including areas away from the electrolyte membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum-based catalysts are used in fuel cells, then high catalytic activity is achieved, but corrosion occurs in acidic environments leading to reduced durability
Solution Approach 1:
The patent replaces expensive platinum catalysts with cheaper alternative materials such as metal organic frameworks (MOFs) and other non-platinum catalysts. These alternative materials form porous particles that provide sufficient catalytic activity for fuel cell operation while being resistant to corrosion in acidic environments, thereby achieving durability without relying on precious metals.
Solution Approach 2:
The patent employs composite catalyst structures combining multiple materials such as metal organic frameworks with porous supports, or combinations of different metals and compounds. These composite structures leverage the advantages of each component: the catalytic activity from the metal centers, the porous structure for surface area and mass transport, and the stability from the framework materials, achieving both high activity and corrosion resistance.
2Productivity
If conventional catalyst particles are used, then some catalytic activity is achieved, but utilization efficiency is low due to lack of uniform three-phase interface
Solution Approach 1:
The patent designs catalyst particles with controlled porous structures having specific pore sizes and distributions. These porous particles allow reactant gases to penetrate deep into the particle interior, creating extensive three-phase interfaces (gas-liquid-solid) throughout the particle volume rather than only at the surface. This dramatically increases the effective catalytic area and ensures uniform reaction distribution, improving both utilization efficiency and performance consistency.
Solution Approach 2:
The patent creates catalyst particles with non-uniform internal structures where different regions have optimized properties: outer regions may have larger pores for mass transport, while inner regions have smaller pores for high surface area. The catalyst active sites are distributed throughout the porous structure rather than concentrated at the surface, ensuring that local conditions throughout the particle are optimized for three-phase interface formation and catalytic reaction.
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 sulfur-containing oxycarbonitride catalyst exhibits enhanced durability, high oxygen reduction ability, and improved utilization efficiency, offering superior performance and cost-effectiveness compared to platinum-based catalysts while maintaining stability in acidic conditions.
Implementation Method 1
a three-phase interface of a gas phase (reaction gas), a liquid phase (solid polymer electrolyte membrane), and a solid phase (catalysts possessed by both electrodes) is formed at the boundaries between the catalyst layers 2 and 3, which carry a platinum-based noble metal and are provided on both electrodes, respectively, and the solid polymer electrolyte membrane 1, whereby DC power is generated by causing an electrochemical reaction
Data Source
AI summary
Provided is a catalyst which does not corrode at high potentials or in acidic electrolytes of fuel cells, is stable, effectively participates in electrode reactions not only in a three-phase interface of a gas phase (humidified reaction gas) and a liquid phase formed in catalyst particles present on the surface in contact with an electrolyte membrane but also in a three-phase interface in catalyst particles in a catalyst layer present at positions away from the electrolyte membrane, has a high utilization efficiency of catalyst particles, has a high oxygen reduction ability, provides high characteristics, and is inexpensive compared to platinum. A fuel cell thus obtained has high characteristics and a long life, and is relatively inexpensive and excellent in economic efficiency. There is provided a porous catalyst comprising a sulfur-containing oxycarbonitride containing molybdenum, boron, and the following metal K (at least one metal selected from the group consisting of tantalum, zirconium, copper, iron, tungsten, titanium, vanadium, cobalt, manganese, aluminum, and nickel).