High-Entropy Electrolyte Composition for Stable Proton Fuel Cells
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Solution Overview
Problem
Existing bidirectional proton conductive fuel cells face performance degradation due to secondary phase-related issues in conventional electrolytes, necessitating a high entropy electrolyte with improved chemical stability and structural integrity.
Innovation Solution
A method involving the synthesis of a high entropy electrolyte material by mixing barium oxide, hafnium oxide, zirconium oxide, cerium oxide, yttrium oxide, and ytterbium oxide, with additional oxides like Sn, Nb, or Zn, followed by calcining, pulverizing, and sintering to form a pellet, enhancing structural stability and proton conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytes are used in bidirectional proton conductive fuel cells, then the cell can operate with basic proton conductivity, but performance degradation occurs due to secondary phase formation
Solution Approach 1:
The patent employs a composite electrolyte material comprising multiple metal oxides (barium oxide, hafnium oxide, zirconium oxide, cerium oxide, yttrium oxide, and ytterbium oxide) in specific ratios. This composite structure prevents secondary phase formation by creating a stable multi-phase system where each component contributes to overall chemical stability, thereby maintaining consistent proton conductivity without performance degradation over time.
Solution Approach 2:
The patent optimizes the compositional parameters of the electrolyte by precisely controlling the ratios of different metal oxides. By adjusting these chemical composition parameters within specific ranges, the electrolyte achieves enhanced chemical stability and suppressed secondary phase formation, directly improving performance reliability without sacrificing proton conductivity.
2Stability of the object's composition
If high entropy electrolyte material is synthesized through multiple calcining and pulverizing cycles, then structural stability and sinterability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary mixing of all metal oxide powders before calcining, ensuring homogeneous distribution of components. This preliminary action prevents aggregation and promotes uniform reaction during subsequent calcining cycles, improving structural stability while reducing the need for excessive pulverizing cycles and simplifying the overall manufacturing process.
Solution Approach 2:
The patent employs periodic calcining and pulverizing cycles rather than continuous processing. This periodic approach allows intermediate assessment and optimization, achieving desired structural stability through controlled repetition of processing steps, which balances manufacturing complexity with product quality.
3Stability of the object's composition
If existing high entropy perovskite oxide electrolytes are used, then compositional entropy is increased, but sinterability remains low
Solution Approach 1:
The patent modifies the compositional parameters by incorporating specific metal oxides (particularly barium oxide as a precursor and optimizing the ratios of hafnium, zirconium, cerium, yttrium, and ytterbium oxides) to achieve the right balance between high compositional entropy and sinterability. This parameter optimization enables the electrolyte to maintain structural stability while becoming sufficiently sinterable for practical manufacturing.
Solution Approach 2:
The patent creates a composite perovskite oxide structure that combines multiple metal oxides with complementary properties. This composite approach maintains high compositional entropy for stability while the specific combination of oxides (particularly barium-based perovskite with rare earth elements) provides enhanced sinterability compared to conventional high entropy perovskites.
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 solution addresses low sinterability and performance degradation, resulting in a high entropy electrolyte with improved structural stability and proton conductivity, enabling efficient operation of bidirectional proton conductive fuel cells at lower temperatures.
Implementation Method 1
bidirectional proton conductive fuel cell (PCEC) has been attracting attention. This is a next-generation energy conversion system that can convert hydrogen into electricity in a fuel cell mode and electricity into fuel in an electrolytic cell mode
Implementation Method 2
calcining and then pulverizing the powder. At this time, the X is any one selected from Sn, Nb, Gd, or Zn.
Implementation Method 3
The solution addresses low sinterability and performance degradation, resulting in a high entropy electrolyte with improved structural stability and proton conductivity
Data Source
AI summary
An embodiment may solve the problem of low sinterability of electrolytes of existing high entropy perovskite oxide materials through an electrolyte with improved structural stability of a matter at high temperatures without unnecessary enthalpy change, and provide a bidirectional proton conductive fuel cell with improved proton conductivity and electrochemical performance by using such an electrolyte.