Lithium-Doped Nickel Oxide Anode for Alkaline Electrolysis
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Solution Overview
Problem
Alkaline water electrolysis systems using nickel anodes face degradation due to power fluctuations, leading to reduced durability and increased risk of electric current leakage, especially when using renewable energy sources with large power fluctuations.
Innovation Solution
A nickel-based anode with a lithium-containing nickel oxide catalytic layer, where the molar ratio of lithium to nickel (Li/Ni) is between 0.005 and 0.15, is formed on a conductive substrate through a heat treatment process at 900°C to 1000°C, enhancing durability and corrosion resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a nickel anode is used in alkaline water electrolysis with renewable energy sources, then the system can utilize large power fluctuations, but the nickel anode degrades due to oxidation and reduction reactions under reverse current conditions
Solution Approach 1:
The patent applies composite materials by combining nickel substrate with coating layers of nickel oxide, nickel hydroxide, and lithium compounds. This composite structure prevents the nickel substrate from direct contact with the alkaline electrolyte, thereby preventing oxidation and reduction reactions that cause degradation under reverse current conditions, while maintaining the ability to withstand power fluctuations from renewable energy sources
Solution Approach 2:
The patent uses an intermediary approach by introducing coating layers (nickel oxide, nickel hydroxide, and lithium compounds) between the nickel substrate and the alkaline electrolyte. These coating layers act as mediators that prevent harmful direct contact and chemical reactions, while still allowing the electrode to function properly during electrolysis operations with varying power inputs
2Reliability
If the nickel anode is maintained at low potential to prevent oxidation, then reverse current reactions are reduced, but electric current leakage occurs through shared pipes in large cells
Solution Approach 1:
The patent applies composite materials by combining nickel substrate with coating layers of nickel oxide, nickel hydroxide, and lithium compounds. This composite structure prevents the nickel substrate from direct contact with the alkaline electrolyte, thereby preventing oxidation and reduction reactions that cause degradation under reverse current conditions, while maintaining the ability to withstand power fluctuations from renewable energy sources
Solution Approach 2:
The patent uses an intermediary approach by introducing coating layers (nickel oxide, nickel hydroxide, and lithium compounds) between the nickel substrate and the alkaline electrolyte. These coating layers act as mediators that prevent harmful direct contact and chemical reactions, while still allowing the electrode to function properly during electrolysis operations with varying power inputs
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 maintains high performance and stability over long-term use, reducing the impact of power fluctuations and preventing electric current leakage, making it suitable for alkaline water electrolysis with renewable energy sources.
Implementation Method 1
a catalytic layer formed on the surface of the conductive substrate and made of lithium-containing nickel oxide
Implementation Method 2
The following production reaction of nickel oxide is assumed to proceed. Ni + 2OH -
Implementation Method 3
a nickel-based anode with a lithium-containing nickel oxide catalytic layer, where the molar ratio of lithium to nickel (Li/Ni) is between 0.005 and 0.15, is formed on a conductive substrate through a heat treatment process at 900°C to 1000°C
Implementation Method 4
preventing electric current leakage
Data Source
Figure 1~2B
Figure 3
Figure 4A~4B
AI summary
An anode for alkaline water electrolysis includes a conductive substrate having at least a surface made of nickel or a nickel-base alloy and a lithium-containing nickel oxide catalytic layer formed on a surface of the substrate. The molar ratio (Li/Ni) of lithium and nickel in the catalytic layer is in the range of 0.005 to 0.15.