Electrochemical Cell Cathode Phase Ratio Control
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Solution Overview
Problem
Fuel cell output is reduced due to cathode deterioration, specifically attributed to the proportion of SrSO4 and (Co, Fe)3O4 in the cathode, leading to inefficiencies in power generation.
Innovation Solution
An electrochemical cell configuration with a cathode comprising a main phase of perovskite oxide and a second phase of SrSO4 and (Co, Fe)3O4, where the occupied surface area ratio of the second phase in the cathode cross-section is limited to less than or equal to 10.5%, enhancing the cathode's structural integrity and reducing inactive portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cathode contains SrSO4 and (Co, Fe)3O4 to improve sintering characteristics, then the cathode structure is strengthened, but the fuel cell output is reduced due to cathode deterioration
Solution Approach 1:
The patent applies parameter changes by precisely controlling the occupied surface area ratio of the second phase (SrSO4 and (Co, Fe)3O4) in the cathode to be 10.5% or less. This quantitative parameter control optimizes the balance between sintering characteristics and fuel cell output, preventing cathode deterioration while maintaining structural strength.
Solution Approach 2:
The patent uses composite materials by combining the main phase (perovskite oxide with Sr and/or La at the A site) with a controlled amount of second phase (SrSO4 and (Co, Fe)3O4). This composite structure leverages the sintering benefits of the second phase while limiting its harmful effects on fuel cell output through precise ratio control.
2Ease of manufacture
If the proportion of SrSO4 and (Co, Fe)3O4 in the cathode is increased to improve sintering, then the cathode framework is strengthened, but cracks form and performance deteriorates over time
Solution Approach 1:
The patent applies parameter changes by establishing a specific threshold (10.5% occupied surface area ratio) for the second phase content. This parameter optimization enables good sintering characteristics while preventing crack formation and composition instability during extended power generation.
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 configuration effectively inhibits fuel cell output reduction and suppresses the formation of cracks, maintaining performance over extended power generation periods by strengthening the cathode's framework and improving sintering characteristics.
Implementation Method 1
a solid electrolyte layer disposed between the anode and the cathode
Implementation Method 2
fuel cells that are a type of electrochemical cell
Data Source
AI summary
The electrochemical cell according to the present invention has an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode contains a main phase and a second phase. The main phase is configured with a perovskite oxide which is expressed by the general formula ABO3 and includes at least one of Sr and La at the A site. The second phase is configured with SrSO4 and (Co, Fe)3O4. An occupied surface area ratio of the second phase in a cross section of the cathode is less than or equal to 10.5%.