Doped Pr-nickelate Fuel Cell Cathode Phase Stability
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Solution Overview
Problem
Solid oxide fuel cells (SOFCs) face limitations due to cathode resistance and phase instability of Pr2NiO4+δ materials at high temperatures, leading to degradation and reduced long-term durability.
Innovation Solution
Doping foreign elements into Pr2NiO4+δ at the A-site and/or B-site to create Pr-nickelate based materials with improved phase stability and reduced degradation, such as (Pr1-xAx)n+1(Ni1-yBy)nO3n+1+δ, where A is a lanthanide and B is a transition metal, enhancing mixed ionic/electronic conducting properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Pr2NiO4+δ material is used as cathode in solid oxide fuel cells, then electrochemical performance is improved, but phase stability deteriorates at high temperatures leading to degradation
Solution Approach 1:
The patent applies parameter changes by systematically varying the doping elements (A-site and B-site dopants) and their concentrations in the Pr-nickelate material composition. This modifies the material's phase stability and electrochemical properties to achieve optimal performance at high temperatures without degradation
Solution Approach 2:
The patent creates composite Pr-nickelate materials by incorporating multiple dopant elements at different crystallographic sites (A-site lanthanides and B-site transition metals). This composite approach combines the beneficial properties of different elements to simultaneously improve phase stability and maintain electrochemical performance
2Power
If operating temperature is increased to improve fuel cell efficiency, then power output is enhanced, but cathode degradation accelerates due to phase instability
Solution Approach 1:
The patent modifies the operational temperature parameter range by developing cathode materials that are specifically engineered to remain stable at elevated temperatures (750-900°C). The doped Pr-nickelate compositions maintain phase stability and resist degradation even at these high operating temperatures, enabling sustained power output over long periods
3Stability of the object's composition
If foreign elements are doped into Pr2NiO4+δ to improve phase stability, then material composition complexity increases, but manufacturing complexity remains manageable
Solution Approach 1:
The patent applies local quality by introducing dopant elements at specific locations within the crystal structure (A-site and B-site positions). Each dopant is placed at its optimal site to provide localized stabilization effects, allowing phase stability improvement without requiring complex multi-element combinations throughout the entire material
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 doped Pr-nickelate materials exhibit increased phase stability and reduced degradation, allowing for higher temperature operation with improved electrochemical performance and long-term durability, potentially reducing costs and enhancing fuel cell efficiency.
Implementation Method 1
doping foreign elements into Pr2NiO4+δ, at the Pr-site (A-site) and/or the Ni-site (B-site), are described
Implementation Method 2
enhancing mixed ionic/electronic conducting properties
Data Source
AI summary
In some examples, a fuel cell including an anode; electrolyte; and cathode separated from the anode by the electrolyte, wherein the cathode includes a Pr-nickelate based material with (Pr1-xAx)n+1(Ni1-yBy)nO3n+1+δ as a general formula, where n is 1 as an integer, A is an A-site dopant including of a metal of a group formed by one or more lanthanides, and B is a B-site dopant including of a metal of a group formed by one or more transition metals, wherein the A and B-site dopants are provided such that there is an increase in phase-stability and reduction in degradation of the Pr-nickelate based material, and A is at least one metal cation of lanthanides, La, Nd, Sm, or Gd, B is at least one metal cation of transition metals, Cu, Co, Mn, Zn, or Cr, where: 0<x<1, and 0<y≤0.4.