Proton-conducting solid oxide electrolyzers, related electrodes and methods for producing hydrogen gas
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Solution Overview
Problem
Oxygen-ion conducting solid-oxide electrolyzers operate at high temperatures, leading to material degradation and incompatibilities, limiting their efficiency and service life.
Innovation Solution
A proton-conducting solid oxide electrolyzer with a first electrode and a second electrode, separated by a proton-conducting solid oxide electrolyte, using barium zirconate doped with transition metals like cobalt, operates at lower temperatures and enhances hydrogen gas production efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If oxygen-ion conducting solid-oxide electrolyzers are operated at high temperatures above 700°C, then hydrogen gas production is achieved, but material degradation and material incompatibilities occur
Solution Approach 1:
The patent changes the operating temperature parameter from above 700°C to below 700°C, and changes the conduction mechanism from oxygen-ion to proton conduction. This parameter change allows the electrolyzer to operate at lower temperatures while maintaining hydrogen production capability, thereby avoiding material degradation associated with high-temperature operation
Solution Approach 2:
The patent replaces the oxygen-ion conduction mechanism with a proton conduction mechanism. This substitution fundamentally changes how the electrolyte functions, enabling operation at lower temperatures below 700°C where materials remain stable and compatible, thus resolving the contradiction between achieving hydrogen production and preventing material degradation
2Productivity
If oxygen-ion conducting solid-oxide electrolyzers are operated at high temperatures above 700°C, then hydrogen gas production is achieved, but material incompatibilities occur
Solution Approach 1:
The patent changes the operating temperature parameter from above 700°C to below 700°C. This temperature parameter change is critical because it maintains material stability and compatibility in the electrolyzer components, preventing the material incompatibilities that would otherwise occur at high temperatures while still enabling hydrogen production
Solution Approach 2:
The patent substitutes the oxygen-ion conduction mechanism with proton conduction. This mechanism substitution enables the system to operate successfully at lower temperatures below 700°C, where materials maintain their compositional stability and compatibility, thus resolving the material incompatibility issue while preserving hydrogen production capability
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 proton-conducting electrolyzer achieves enhanced Faraday efficiency, increased service life, and reduced operational costs compared to conventional electrolyzers, producing hydrogen gas efficiently and cost-effectively.
Implementation Method 1
a proton-conducting solid oxide electrolyte between the first electrode and the second electrode
Implementation Method 2
a first electrode configured to produce oxygen gas from steam
Implementation Method 3
a second electrode configured to produce hydrogen gas from the steam
Data Source
AI summary
A proton-conducting solid oxide electrolyzer includes a first electrode configured to produce oxygen gas from steam, a second electrode configured to produce hydrogen gas from the steam, and a proton-conducting solid oxide electrolyte between the first electrode and the second electrode. The first electrode includes barium zirconate of formula BaZrO3−δ doped with at least one transition metal and substantially free of a rare earth element, wherein δ is an oxygen deficit, and wherein the at least one transition metal comprises cobalt. Also disclosed are an electrode for the proton-conducting solid oxide electrolyzer, and a method of producing hydrogen gas.