Electrolytic Electrode with Needle-Like Catalyst Layer
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Solution Overview
Problem
Existing electrodes for electrolysis face challenges in minimizing overvoltage requirements and maintaining durability, particularly due to reverse current issues that lead to metal component elution and decreased efficiency.
Innovation Solution
A metal substrate electrode with a catalyst layer containing nitrogen, a platinum group metal, and a rare earth metal, featuring a needle-like structure, is developed using a coating solution with specific precursors and solvents, which reduces overvoltage and enhances durability without requiring additional precursors or changing manufacturing facilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional cathode material such as mild steel, nickel, or stainless steel is used, then the manufacturing process is simple and cost-effective, but the overvoltage is high (300 to 400 mV) and durability is poor due to metal component elution under reverse current
Solution Approach 1:
The patent applies composite materials by combining multiple metal components (first metal component, second metal component, and third metal component) in specific weight ratios (first metal component: 60-90 wt%, second metal component: 5-30 wt%, third metal component: 1-10 wt%) to create a cathode material that achieves both high durability and low overvoltage. This composite structure prevents metal component elution under reverse current while maintaining manufacturing simplicity
Solution Approach 2:
The patent applies parameter changes by optimizing the weight ratios of metal components and controlling the particle size distribution (D50 value between 1-10 μm) to achieve the desired balance between durability and overvoltage reduction. By adjusting these parameters within specific ranges, the cathode maintains structural integrity under reverse current while achieving low overvoltage operation
2Reliability
If the cathode surface is activated to reduce overvoltage, then the overvoltage decreases slightly, but the durability deteriorates due to partial elution of metal components under reverse current
Solution Approach 1:
The patent uses composite materials with specific metal component combinations and ratios to create a cathode that resists metal component elution under reverse current. The composite structure with first metal component (60-90 wt%), second metal component (5-30 wt%), and third metal component (1-10 wt%) provides both low overvoltage and high durability by preventing individual metal components from detaching
Solution Approach 2:
The patent applies local quality by creating a specific particle size distribution with D50 value between 1-10 μm and controlling the morphological characteristics of metal components. This localized structural optimization ensures that the cathode material maintains its integrity at the particle level, preventing elution while achieving the desired electrochemical performance
3Reliability
If additional precursors or modified manufacturing facilities are introduced to improve electrode performance, then the overvoltage reduction and durability improve, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent applies self-service by using a simple mixing and sintering process where the metal components self-organize into the desired composite structure during sintering at 400-600°C for 1-10 hours. The process requires no additional precursors or complex manufacturing facilities, yet achieves the desired performance through controlled composition and heat treatment
Solution Approach 2:
The patent applies parameter changes by optimizing the sintering temperature (400-600°C) and time (1-10 hours) to achieve the desired particle size distribution and metal component distribution. By controlling these parameters, the simple manufacturing process produces a cathode with D50 value between 1-10 μm and the specified metal component ratios, achieving both performance and manufacturing simplicity
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 electrode achieves a significant reduction in overvoltage and improved durability, maintaining stable performance even under reverse current conditions, with a nitrogen content of 20-60 mol% in the catalyst layer and a needle-like structure that reduces catalytic material detachment.
Implementation Method 1
a catalyst layer formed on the metal substrate, wherein the catalyst layer includes nitrogen, a platinum group metal and a rare earth metal
Implementation Method 2
the catalyst layer includes nitrogen, a platinum group metal and a rare earth metal... featuring a needle-like structure that reduces catalytic material detachment
Data Source
Figure 1
Figure 2
AI summary
Provided is an electrode for electrolysis and a preparation method of the same. The electrode for electrolysis has an improved needle-like structure of a rare earth metal compared to conventional electrodes, and thus detachment of catalytic materials is reduced, so that the electrode is excellent in durability such as exhibiting stable performance even in a reverse current flow. Further, since the electrode for electrolysis has a low overvoltage value, an overvoltage required amount of the electrolytic cell can be remarkably reduced. In addition, an electrode for electrolysis having the above effect can be prepared without introducing additional precursors or changing manufacturing facilities.