Electrode Preparation via Corrosion-Accelerated Hydroxide Formation
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Solution Overview
Problem
Existing electrodes for alkaline electrolysis in water electrolysis systems face challenges in achieving high binding strength with substrates while maintaining a simple process, and they are prone to rapid deactivation due to sintering and agglomeration of metal nanocatalysts during heat treatment.
Innovation Solution
A method for preparing an electrode involving the immersion of a metal substrate in a reaction solution containing a transition metal precursor and a corrosion accelerator, followed by oxygen injection to form a catalyst layer comprising a multi-component transition metal hydroxide structure, which enhances binding strength and reduces the need for complex processes or high-temperature treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydrothermal synthesis or electrostatic coating is used to form the catalyst layer, then the binding strength between substrate and catalyst is low, but the process becomes simple and low-temperature
Solution Approach 1:
The patent changes the chemical parameters of the reaction solution by incorporating corrosion accelerators (ammonium compounds, metal salts, or their combinations) to enable the formation of a catalyst layer with both high binding strength and simple processing. The corrosion accelerator modifies the electrochemical reactions during the formation process, allowing the catalyst layer to bond strongly to the substrate without requiring complex multi-step procedures or high-temperature treatments.
2Strength
If plasma deposition or electrochemical plating is used to form the catalyst layer, then the binding strength between substrate and catalyst is high, but the process becomes complex and continuous
Solution Approach 1:
The patent extracts the essential function of strong binding from complex processes like plasma deposition or electrochemical plating by using a simplified corrosion-accelerated formation method. The corrosion accelerator selectively promotes the formation of a bonded catalyst layer during a single-step process, eliminating the need for complex continuous processes while maintaining high binding strength through controlled electrochemical reactions and corrosion product formation.
3Strength
If heat treatment at high temperature is applied to improve binding strength, then the binding strength increases, but the metal nanocatalysts undergo sintering and agglomeration causing rapid deactivation
Solution Approach 1:
The patent performs preliminary action by forming the catalyst layer with inherent strong binding during the formation process itself, rather than attempting to strengthen it later through high-temperature heat treatment. The corrosion accelerator enables the catalyst layer to bond strongly to the substrate during the formation stage, eliminating the need for subsequent high-temperature treatment that would cause sintering and agglomeration of metal nanocatalysts.
4Strength
If multiple coating and heat treatment steps are repeated to improve binding strength, then the binding strength increases, but the manufacturing time and process complexity increase
Solution Approach 1:
The patent merges multiple functions (catalyst layer formation, binding strength enhancement, and corrosion protection) into a single integrated process step. The corrosion accelerator enables simultaneous achievement of strong binding and catalyst formation in one operation, eliminating the need for repeated separate coating and heat treatment steps, thereby reducing manufacturing time while maintaining high binding strength.
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 method achieves excellent binding strength between the substrate and the catalyst layer, improves the durability and efficiency of the electrode in hydrogen and oxygen reactions, and allows for large-area electrode preparation without the need for a separate power supply.
Implementation Method 1
forming a catalyst layer on the metal substrate, wherein the catalyst layer comprises a transition metal hydroxide structure
Implementation Method 2
reacting the metal substrate while oxygen is injected thereto to form a catalyst layer
Implementation Method 3
the second transition metal is eluted from the metal substrate by the formation of second transition metal-ammine complex ions
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a method for preparing an electrode having excellent efficiency of oxygen generation reaction through elution and precipitation reactions of transition metal without a separate power supply. Specifically, the method for preparing an electrode according to an embodiment of the present invention includes the steps of: a) preparing a reaction solution containing a corrosion accelerator and a transition metal precursor including a first transition metal; and b) immersing a metal substrate including a second transition metal in the reaction solution and then reacting the metal substrate while oxygen is injected thereto to form a catalyst layer on the metal substrate.