Solid Oxide Fuel Cell Anode Void Diameter Control

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Solution Overview

Problem

Solid oxide fuel cells face a trade-off between increasing the number of reaction sites for improved electrical power generation and maintaining the bonding strength of the anode-electrolyte interface, as high porosity can lead to film peeling and reduced bonding strength, while low porosity may hinder catalyst impregnation and electron conduction.

Innovation Solution

A fuel cell design with a porous anode having an average void diameter of 0.1 μm to 2 μm and a void diameter distribution where D10% is 0.1 μm to 2 μm and D90% is 1 μm to 7 μm, ensuring sufficient porosity for reaction sites and bonding strength, achieved through careful control of the anode structure and catalyst impregnation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the porosity of the anode is enlarged to increase the number of reaction sites, then electrical power generation performance is improved, but bonding strength of the anode-electrolyte interface is reduced and film peeling may occur

Engineering Contradiction:

Improveelectrical power generation performanceVSAvoidbonding strength of anode-electrolyte interface

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The invention changes the physical parameters of the anode structure by controlling void diameter within a specific range (0.1 μm to 2 μm) and regulating void diameter distribution (D10%: 0.1 μm to 2 μm, D90%: 1 μm to 7 μm). This parameter optimization allows the anode to maintain sufficient porosity for catalyst impregnation and reaction sites while ensuring adequate bonding strength with the electrolyte layer, thus resolving the contradiction between power generation performance and interface bonding strength

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention applies local quality control by creating a specific void structure within the anode that differs from uniform porosity. By controlling the distribution of void diameters (with D10% and D90% parameters), the anode achieves locally optimized regions that balance catalyst accessibility (requiring porosity) and interface bonding (requiring structural integrity), thereby improving power generation without causing film peeling

Inventive Principle:

Principle #3Local quality

2Strength

If the porosity of the anode is reduced to maintain bonding strength, then film peeling is prevented, but catalyst impregnation and electron conduction are hindered

Engineering Contradiction:

Improvebonding strength of anode-electrolyte interfaceVSAvoidcatalyst impregnation effectiveness

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The invention optimizes the porosity parameter by specifying a precise void diameter range (0.1 μm to 2 μm) and distribution characteristics (D10%: 0.1 μm to 2 μm, D90%: 1 μm to 7 μm). This controlled porosity level is sufficient to allow catalyst impregnation and maintain electron conduction pathways while being low enough to preserve bonding strength and prevent film peeling, thus resolving the contradiction between interface strength and manufacturing effectiveness

Inventive Principle:

Principle #35Parameter changes

3Strength

If the separator is made by pressing a steel board, then structural strength is improved, but the separator becomes thick and the fuel cell size is enlarged

Engineering Contradiction:

Improveseparator structural strengthVSAvoidseparator thickness

Core Design Contradiction:

StrengthVSLength of stationary object

Solution Approach 1:

The invention changes the physical state and structural parameters of the separator by transitioning from a dense pressed steel board to a porous structure with controlled void diameter (0.1 μm to 2 μm) and specific porosity. This parameter transformation enables the separator to achieve sufficient structural strength through its porous architecture while significantly reducing thickness, thereby preventing fuel cell size enlargement

Inventive Principle:

Principle #35Parameter changes

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

This design enhances electrical power generation performance by increasing reaction sites while maintaining interface bonding strength, preventing film peeling and ensuring effective catalyst impregnation and electron conduction.

Implementation Method 1

a solid oxide electrolyte layer having oxygen ion conductivity

Methodology Applied

Scientific EffectOxygen ion conductivity: Conduction (electrical)

Implementation Method 2

an anode catalyst is provided in a void... oxygen ions from the cathode via the solid oxide electrolyte layer react with hydrogen included in fuel gas. By the reaction, electrical power is generated

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS11431015B2Fuel cell and manufacturing method of the same

Publication Date: 2022.08.30 TAIYO YUDEN KK

AI summary

A fuel cell includes: a porous anode; and an electrolyte layer that is provided on the anode and includes solid oxide having oxygen ion conductivity, wherein the anode has a structure in which an anode catalyst is provided in a void, wherein, in a cross section of the anode and the electrolyte layer in a stacking direction thereof, an average void diameter of voids in the anode is 0.1 μm or more and 2 μm or less, wherein, in the cross section, a D10% diameter of void diameter distribution of the voids in the anode is 0.1 μm or mode and 2 μm or less, wherein a D90% diameter of the void diameter distribution is 1 μm or more and 7 μm or less.