Supported Catalyst Nano-Hetero Structure for Fuel Cell Performance
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Solution Overview
Problem
Current fuel cell catalysts face challenges in achieving high catalytic activity, conductivity, and stability, particularly at temperatures lower than 100° C, limiting their output performance and practical applications.
Innovation Solution
A supported catalyst with a nano-hetero structure is developed, featuring an oxide carrier, catalyst particles, and catalyst layers containing oxides or composite oxides with elements like Mo, W, Sn, and Ru, which enhance catalytic activity, conductivity, and stability through a synergistic effect at the common interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional catalyst materials are used in fuel cells, then the structure is simple and ease of manufacture is good, but the catalytic activity is low and output performance is poor
Solution Approach 1:
The patent employs composite catalyst materials consisting of metal particles (such as Pt, Pd, Rh, Ir) supported on oxide carriers (such as TiO2, ZnO, ZrO2, SnO2). This composite structure combines the high catalytic activity of metals with the stability and conductivity of oxides, achieving both improved output performance and practical usability in fuel cells.
Solution Approach 2:
The patent creates a heterogeneous structure where catalyst layers with specific oxide compositions are localized at the interface between metal particles and the oxide carrier. This local concentration of catalytically active oxides at critical interfaces enhances the overall catalytic activity without requiring uniform distribution throughout the entire catalyst structure, thus improving productivity while controlling complexity.
2Productivity
If alloying with transition metals is performed to improve catalytic activity, then the catalytic activity increases, but the electrochemical stability decreases
Solution Approach 1:
The patent introduces oxide carriers and oxide layers as intermediary materials between the metal catalyst particles and the environment. These oxides (such as TiO2, ZnO, ZrO2, SnO2, MoO3, WO3) act as mediators that protect the metal particles from degradation and elution while maintaining or enhancing catalytic activity, thus resolving the contradiction between activity and stability.
Solution Approach 2:
The patent creates composite catalyst structures where metal particles are supported on stable oxide carriers. This composite approach combines the high catalytic activity of transition metals with the electrochemical stability of oxides, achieving both improved catalytic activity and maintained reliability in the fuel cell environment.
3Reliability
If oxides are used as carrier materials to support catalyst material, then the durability improves, but the catalytic activity may be insufficient
Solution Approach 1:
The patent creates a heterogeneous structure where catalyst layers with specific oxide compositions are localized at the interface between metal particles and the oxide carrier. This local concentration of catalytically active oxides at critical interfaces enhances the overall catalytic activity without requiring uniform distribution throughout the entire catalyst structure, thus improving productivity while controlling complexity.
Solution Approach 2:
The patent employs composite catalyst materials consisting of metal particles (such as Pt, Pd, Rh, Ir) supported on oxide carriers (such as TiO2, ZnO, ZrO2, SnO2). This composite structure combines the high catalytic activity of metals with the stability and conductivity of oxides, achieving both improved output performance and practical usability in fuel cells.
4Reliability
If carbon powders are used as carrier material, then the conductivity is good, but the catalytic activity is low and durability is insufficient
Solution Approach 1:
The patent employs composite catalyst materials consisting of metal particles (such as Pt, Pd, Rh, Ir) supported on oxide carriers (such as TiO2, ZnO, ZrO2, SnO2). This composite structure combines the high catalytic activity of metals with the stability and conductivity of oxides, achieving both improved output performance and practical usability in fuel cells.
Solution Approach 2:
The patent modifies the carrier material from conventional carbon powders to metal oxides with controlled composition and properties. By changing the chemical and physical parameters of the carrier (using oxides with specific band structures, surface areas, and compositions), the patent achieves both improved durability and enhanced catalytic activity, overcoming the limitations of carbon-based carriers.
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 nano-hetero structure improves catalytic activity, conductivity, and stability, leading to enhanced fuel cell performance and output, with the catalyst layers having a melting point lower than 1500° C and an average thickness of 0.2 to 3 nm, optimizing the interaction between catalyst particles, oxide carrier, and promoter layers.
Implementation Method 1
a catalytic reaction takes place on the surface of the catalyst contained in the anode catalyst layer and cathode catalyst layer. The catalytic reaction generates protons in the fuel electrode
Implementation Method 2
electrons migrate into the anode diffusion layer. In the oxidizing electrode, the electrons supplied from the cathode diffusion layer, the protons supplied from the proton conductive membrane, and oxygen react
Implementation Method 3
catalyst particles supported on the oxide carrier; catalyst layers supported on the oxide carrier, containing an oxide or a composite oxide
Data Source
AI summary
A supported catalyst includes an oxide carrier, catalyst particles supported on the oxide carrier, and catalyst layers which locate among the catalyst particles, with interface portions among the oxide carrier, the catalyst particles and the catalyst layers. The catalyst layers have a melting point lower than 1,500° C. and contain an oxide or a composite oxide which includes at least one element selected from the group consisting of Mo, W, Sn and Ru.