SrCoOxHy Electrolyte for Low-Temperature Solid Oxide Fuel Cells
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Solution Overview
Problem
Conventional solid oxide fuel cells face challenges in reducing working temperature due to low ion conductivity of electrolytes at low temperatures, limiting their development and practical application.
Innovation Solution
A solid-state fuel battery with a hydrogen-containing transition metal oxide electrolyte, specifically SrCoOxHy, is developed, where the electrolyte is synthesized by soaking a transition metal oxide with an ionic liquid and applying an electric field to insert hydrogen ions, enhancing ion conductivity at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional solid oxide fuel cells use traditional electrolyte materials, then the electrolyte can maintain structural stability, but the ion conductivity remains low at low temperatures requiring high working temperatures
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of the electrolyte material from traditional oxides to hydrogen-containing transition metal oxides with specific stoichiometry (ABOxHy where x=1-3, y=0-2.5). This compositional parameter change enables the electrolyte to achieve high hydrogen ion conductivity at low temperatures through enhanced lattice hydrogen ion transport mechanisms, resolving the contradiction between low working temperature and sufficient ion conductivity
Solution Approach 2:
The patent employs composite materials by creating a novel class of hydrogen-containing transition metal oxides that combine characteristics of both oxide stability and hydrogen ion conductivity. These composite-like structures integrate metal ions (A and B sites) with hydrogen and oxygen in specific ratios, forming a material that simultaneously provides structural stability and high ion conductivity at low temperatures
2Loss of energy
If the working temperature is reduced below 1000°C, then energy efficiency improves, but the electrolyte ion conductivity becomes insufficient
Solution Approach 1:
The patent changes the fundamental parameter of electrolyte composition to hydrogen-containing transition metal oxides, which possess intrinsic high hydrogen ion conductivity at low temperatures. This parameter change allows the fuel cell to operate efficiently at reduced temperatures while maintaining sufficient ion conductivity, as the hydrogen-containing lattice structure facilitates rapid hydrogen ion transport even below 1000°C
Solution Approach 2:
The patent applies local quality by optimizing the specific hydrogen content (y parameter) and oxygen stoichiometry (x parameter) in the ABOxHy structure to create regions of high ion conductivity within the electrolyte. By precisely controlling the local chemical environment and hydrogen distribution in the lattice, the material achieves enhanced ion transport properties at low operating temperatures
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 SrCoOxHy electrolyte exhibits high hydrogen ion conductivity from room temperature to 180°C, allowing the solid-state fuel battery to operate at a relatively low working temperature, effectively addressing the ion conductivity limitations of conventional electrolytes.
Implementation Method 1
applying an electric field to insert hydrogen ions
Implementation Method 2
applying an electric field to insert hydrogen ions
Data Source
AI summary
A solid-state fuel battery comprises an anode, a cathode spaced from the anode, and a solid-state electrolyte disposed between the anode and the cathode. A material of the solid-state electrolyte is a hydrogen-containing transition metal oxide having a structural formula of ABOxHy, wherein A is one or more of alkaline earth metal elements and rare-earth metal elements, B is one or more of transition metal elements, x is a numeric value in a range of 1 to 3, and y is a numeric value in a range of 0 to 2.5. A method for making the solid-state electrolyte for the solid-state fuel battery is further provided in the present disclosure.