Solid Oxide Electrolyte with Multi-Dopant Composition
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Solution Overview
Problem
Solid oxide fuel cells (SOFCs) face challenges due to the low ion conductivity of existing solid oxide electrolytes, such as YSZ, which limits their actual output voltage and efficiency, necessitating a material with high ion conductivity, excellent sintering properties, and a wide range of driving temperatures.
Innovation Solution
A solid oxide electrolyte with an oxygen ion-conducting solid solution represented by Formula Zr1-x-y-zMaxMbyMczO2-δ, where x, y, and z are within specific ranges, and δ ensures ionic neutrality, incorporating metals from Group 3, 5-13, and 14 with different ionic radii to enhance oxygen vacancy formation and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If YSZ is used as the solid oxide electrolyte, then the electrolyte has excellent sintering properties and high mechanical strength, but the ion conductivity is low resulting in reduced actual output voltage
Solution Approach 1:
The patent develops a composite solid oxide electrolyte material combining YSZ with other metal oxides (such as Gd2O3, Sm2O3, or CeO2) to create a multi-component system. This composite approach allows the electrolyte to inherit the excellent sintering properties and mechanical strength of YSZ while gaining enhanced ion conductivity from the additional components, thereby resolving the contradiction between structural stability and ionic transport performance
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolyte by introducing dopant oxides at controlled concentrations (typically 5-20 mol%). This parameter change alters the crystal structure and defect chemistry of the base YSZ, creating additional oxygen vacancies that enhance ion conductivity while maintaining the cubic fluorite structure responsible for good sintering behavior and mechanical properties
2Loss of energy
If the solid oxide electrolyte has high ion conductivity, then the actual output voltage increases, but the sintering properties and mechanical strength may deteriorate
Solution Approach 1:
The patent optimizes the dopant concentration within specific ranges (5-20 mol%) to achieve the right balance. Below this range, ion conductivity is insufficient; above this range, excessive doping disrupts the crystal structure and reduces mechanical strength. The optimal composition within this range maximizes oxygen vacancy concentration for high ion conductivity while preserving the structural integrity needed for excellent sintering properties and mechanical strength
Solution Approach 2:
The patent creates local compositional variations within the electrolyte structure through controlled doping, where dopant atoms are distributed at specific lattice sites to create localized regions of high ion conductivity. This local modification allows enhanced ionic transport pathways to form without compromising the overall structural framework, thereby maintaining excellent sintering properties and mechanical strength while achieving high bulk ion conductivity
3Loss of energy
If the electrolyte is designed for high ion conductivity, then ohmic resistance decreases and voltage increases, but the driving temperature range may be limited
Solution Approach 1:
The patent designs a composite electrolyte system where different metal oxide components contribute complementary properties: YSZ provides thermal stability and structural framework for wide temperature operation, while dopant oxides (Gd2O3, Sm2O3, CeO2) provide oxygen vacancies for high ion conductivity. This composite structure maintains phase stability across a broad temperature range (400-1000°C) while ensuring low ohmic resistance throughout the entire operating window, achieving both high conductivity and wide adaptability
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 new electrolyte exhibits significantly higher oxygen ion conductivity, leading to increased actual output voltage and reduced ohmic resistance, thereby improving the efficiency and durability of SOFCs while maintaining excellent sintering properties and a wide temperature range.
Implementation Method 1
a solid oxide electrolyte including an oxygen ion-conducting solid solution
Implementation Method 2
incorporating metals from Group 3, 5-13, and 14 with different ionic radii to enhance oxygen vacancy formation and conductivity
Implementation Method 3
calcining the precursor mixture under an oxygen atmosphere to obtain the solid oxide electrolyte
Data Source
AI summary
A solid oxide electrolyte including an oxygen ion conducting solid solution, wherein the solid solution is represented by Formula 1 below:Zr1-x-y-zMaxMbyMczO2-δ Formula 1wherein x is greater than 0 and less than about 0.3, y is greater than 0 and less than about 0.1, z is greater than 0 and less than about 0.1, δ is selected to make the solid solution ionically neutral,Ma, Mb, and Mc are each independently a metal selected from the group consisting of elements of Groups 3, Groups 5 through 13, and Group 14, andan ionic radius of each of Ma+3, Mb+3, and Mc+3 are different from each other.