Porous Metal-Fiber Electrode with Depth-Controlled Catalyst Layer
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Solution Overview
Problem
Existing electrochemical cells, particularly polymer electrolyte electrolysis cells (PEMECs), face challenges in ensuring sufficient durability and electrolytic properties due to the use of platinum and noble metal catalysts, and there is a need for improved methods to generate hydrogen from ammonia and carbon dioxide through electrolysis.
Innovation Solution
The use of a support structure comprising metal fibers or particles with a catalyst layer positioned between 3×D and 10×D from the surface, utilizing a porous and conductive material with a specific porosity and catalyst composition, including noble metals like Ir, Ru, and Pt, to enhance electrolysis efficiency and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If platinum and noble metal catalysts are used for PEMEC cathodes and anodes, then electrolytic properties are improved, but cost increases and resource scarcity becomes an issue
Solution Approach 1:
The patent changes the parameters of the catalyst layer by controlling its thickness to be between 3×D and 10×D, where D is the average fiber diameter of the metal fiber bundle. This optimized thickness parameter allows sufficient catalytic activity while reducing noble metal content. Additionally, the porosity of the catalyst layer is controlled between 30-70 vol% to optimize both performance and material usage
Solution Approach 2:
The patent uses composite materials by combining metal fiber bundles with catalyst layers containing noble metal particles (Ir, Ru, Pt, Pd) dispersed on metal oxide supports (TiO2, SnO2, ZnO, In2O3). This composite structure provides both structural integrity and catalytic functionality while reducing the amount of expensive noble metals needed
2Reliability
If catalyst layer thickness is increased to improve electrolytic characteristics, then catalytic activity increases, but noble metal consumption increases
Solution Approach 1:
The patent optimizes the thickness parameter of the catalyst layer to be specifically between 3×D and 10×D (where D is the average fiber diameter), and controls porosity between 30-70 vol%. These parameter optimizations ensure sufficient catalytic activity while minimizing material consumption. The specific thickness range provides the right balance between catalytic performance and material usage
3Productivity
If metal fiber diameter is reduced to increase surface area, then catalytic efficiency improves, but structural stability decreases
Solution Approach 1:
The patent optimizes the average fiber diameter D as a key parameter, controlling it within specific ranges to balance surface area and structural stability. The fiber diameter is controlled to achieve optimal catalytic efficiency while maintaining mechanical integrity of the electrode structure
Solution Approach 2:
The patent creates composite structures by combining metal fibers with metal oxide particles and catalyst nanoparticles. The metal oxide support (TiO2, SnO2, ZnO, In2O3) provides structural stability while the noble metal particles dispersed on them provide catalytic activity, achieving both efficiency and stability
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 proposed electrode design improves durability and electrolytic characteristics, enabling efficient hydrogen generation from water or ammonia, and carbon monoxide from carbon dioxide, while minimizing noble metal usage and maintaining structural stability.
Implementation Method 1
a catalyst layer provided on the metal fibers or the metal particles on the first surface side of the support
Implementation Method 2
a support comprising metal fibers or metal particles... with a specific porosity
Implementation Method 3
a support comprising metal fibers or metal particles... a porous and conductive material
Data Source
AI summary
An electrode according to an embodiment includes a support comprising metal fibers or metal particles, the support comprising a first surface and a second surface located opposite the first surface and a catalyst layer provided on the metal fibers or the metal particles on the first surface side of the support. An average fiber diameter of the metal fibers and an average primary diameter of the metal particles are denoted as D. A direction from the first surface of the support to the second surface of the support is a thickness direction of the support. The catalyst layer is provided at from the first surface to a position at a minimum depth of 3×D or more and a position at a maximum depth of 10×D or less.