Solid Oxide Fuel Cell Intermediate Layer for Sr Diffusion Control
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Solution Overview
Problem
Conventional solid oxide fuel cells and electrolysis cells face performance impairment due to high electric resistance caused by the generation of SrZrO3, which is not adequately addressed by simply controlling the amount of SrZrO3 in the cells, and requires a balanced interface contact ratio and maximum interface contact length to maintain optimal electrical contact.
Innovation Solution
The electrochemical reaction single cell is designed with an electrolyte layer containing Zr and at least one of Y, Sc, and Ca, an anode with Sr and Co, and an intermediate layer between the electrolyte and cathode, with a controlled interface contact ratio of 25.5% to 68.6% and maximum interface contact length of 0.3 μm or more to prevent excessive Sr diffusion and maintain low electric resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the firing temperature of the cathode is excessively high, then Sr diffusion increases during firing, causing large amount of SrZrO3 generation and high electric resistance
Solution Approach 1:
The GDC-containing intermediate layer acts as a thermal and chemical intermediary during the cathode firing process. It provides a stable barrier that reduces Sr diffusion from the cathode to the electrolyte even at high firing temperatures, preventing excessive SrZrO3 formation and associated electrical resistance
Solution Approach 2:
The intermediate layer is prepared in advance as a protective cushion between the cathode and electrolyte before the firing process. This pre-established barrier cushions against the harmful effects of high-temperature Sr diffusion, preventing direct reaction between Sr and Zr during firing
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 reduces electric resistance and prevents impairment of the electrochemical reaction single cell's performance by ensuring optimal electrical contact and minimizing SrZrO3 generation, leading to improved electricity generation and durability.
Implementation Method 1
the diffusion of Sr (strontium) contained in the cathode toward the electrolyte layer and the reaction between the diffused Sr and Zr (zirconium) contained in the electrolyte layer cause generation of SrZrO3
Implementation Method 2
a fuel cell for generating electricity by utilizing electrochemical reaction between hydrogen and oxygen
Implementation Method 3
an electrolyte layer containing a solid oxide
Data Source
AI summary
An electrochemical reaction single cell including an electrolyte layer containing Zr and at least one of Y, Sc, and Ca, an anode disposed on one side of the electrolyte layer, a cathode containing Sr and Co and disposed on the other side of the electrolyte layer, and an intermediate layer disposed between the electrolyte layer and the cathode. The electrochemical reaction single cell exhibits an interface contact ratio of 25.5% to 68.6%, wherein the interface contact ratio is the ratio of the sum of the lengths of portions containing neither SrZrO3 nor cavities of an interfacial surface of the intermediate layer on the electrolyte layer side to the total length of the interfacial surface. Also disclosed is an electrochemical reaction cell stack including a plurality of electrochemical reaction single cells, at least one of which is the above described electrochemical reaction single cell.