Composite Oxide Anode Coating for Low-Temperature Alkaline Electrolysis
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Solution Overview
Problem
Existing anodes for alkaline water electrolysis using renewable energy suffer from high overvoltage and have a short lifespan, particularly when exposed to power fluctuations, and existing solutions like high-temperature fired lithium-containing nickel oxide anodes are not practical.
Innovation Solution
A coating comprising lithium-containing nickel oxide, iridium oxide, and at least one of strontium oxide, lanthanum oxide, or calcium oxide is applied to a conductive substrate, followed by heat-treatment at 400° C. to 600° C., enhancing electron conductivity and stabilizing the catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lithium-containing nickel oxide coating is formed on a conductive substrate, then overvoltage is reduced and catalytic activity is maintained for a long period, but the firing temperature becomes extremely high (900°C to 1000°C)
Solution Approach 1:
The patent changes the firing temperature parameter from 900-1000°C to 400-600°C by modifying the coating composition to include strontium oxide, lanthanum oxide, or calcium oxide as additives. This parameter change makes the manufacturing process more practical while maintaining the low overvoltage and long lifespan properties.
Solution Approach 2:
The patent creates a composite coating material combining lithium-containing nickel oxide with strontium oxide, lanthanum oxide, or calcium oxide. This composite structure enables the formation of a stable catalyst layer at lower temperatures (400-600°C) while maintaining catalytic activity and reducing overvoltage, thus resolving the contradiction between achieving long lifespan and avoiding extremely high firing temperatures.
2Reliability
If a catalyst layer is formed with nickel-cobalt spinel oxide or lanthanide-nickel-cobalt perovskite oxide, then corrosion resistance is maintained, but the manufacturing complexity increases
Solution Approach 1:
The patent applies a coating with specific local composition (lithium-containing nickel oxide combined with strontium oxide, lanthanum oxide, or calcium oxide) on the conductive substrate surface. This localized quality enhancement provides corrosion resistance and stable catalytic activity without requiring complex multi-layer structures or sophisticated manufacturing processes.
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 anode achieves low overvoltage and maintains catalytic activity for a long period, extending its lifespan and improving resistance to output fluctuations.
Implementation Method 1
the coating comprises 1) a lithium-containing nickel oxide, 2) an iridium oxide, and 3) at least one of a strontium oxide, a lanthanum oxide, and a calcium oxide... overvoltage in alkaline water electrolysis is reduced and furthermore, catalytic activity of the electrode is maintained for a long period
Implementation Method 2
a step for heat-treating the conductive substrate to which the solution has been applied at a temperature of 400° C. to 600° C. in an atmosphere comprising oxygen
Data Source
AI summary
Provided is an anode for alkaline water electrolysis comprising a conductive substrate and a coating formed on a surface of the conductive substrate, wherein the coating comprises1) a lithium-containing nickel oxide,2) an iridium oxide, and3) at least one of a strontium oxide, a lanthanum oxide, and a calcium oxide.