Electrolysis Electrode Catalyst Composition for Low Overvoltage
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Solution Overview
Problem
Conventional electrodes for sodium chloride electrolysis, such as DSA anodes, experience high initial overvoltage and have durability issues, leading to power consumption losses and inadequate long-term performance due to high chlorine generating overvoltage.
Innovation Solution
An electrode with a catalyst layer comprising ruthenium, iridium, titanium, and a first transition metal element like vanadium, with specific content ratios and forming a solid solution, is developed to reduce initial overvoltage and enhance durability, allowing for low voltage and low power consumption during electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional DSA anodes are used, then chlorine generation is achieved, but initial overvoltage becomes high and power consumption increases
Solution Approach 1:
The invention changes the chemical composition parameters of the catalyst layer by incorporating specific transition metal elements (Mn, Fe, Co, Ni, Cu, or Zn) in controlled amounts (0.1-10 wt%) alongside Ru and Ir oxides. This compositional parameter change enables the electrode to achieve low initial overvoltage while maintaining stable chlorine generation, directly resolving the contradiction between power consumption and initial overvoltage
Solution Approach 2:
The invention creates a composite catalyst layer material combining Ru oxide, Ir oxide, and transition metal oxides in specific proportions. This composite structure synergistically combines the high chlorine generation activity of Ru with the stability of Ir and the overvoltage-reducing effect of transition metals, achieving both low power consumption and reliable performance from the initial stage
2Productivity
If electrolysis is continued over a long period, then production continues, but voltage increases due to impurities and other causes
Solution Approach 1:
The catalyst layer composition with transition metal elements maintains stable catalytic activity over extended operation periods. The transition metals prevent deactivation and maintain consistent chlorine generation efficiency, enabling continuous production without the voltage increases that typically occur during long-term electrolysis, thus reducing energy loss while maintaining productivity
3Reliability
If catalyst layer contains only Ru and Ir oxides, then chlorine generation occurs, but overvoltage does not sufficiently lower and durability is inadequate
Solution Approach 1:
The invention modifies the catalyst layer composition by adding transition metal elements in specific quantities (0.1-10 wt%) to the Ru-Ir oxide system. This parameter change optimizes both the electronic structure and surface properties of the catalyst, simultaneously achieving lower overvoltage and enhanced durability through improved resistance to impurity accumulation and structural degradation
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 reduced overvoltage at the initial stage of electrolysis, enabling long-term operation at low voltage and low power consumption, improving the durability and efficiency of the electrolysis process.
Implementation Method 1
a catalyst layer formed on a surface of the conductive substrate, wherein the catalyst layer comprises ruthenium element, iridium element, titanium element, and at least one first transition metal element
Implementation Method 2
Sodium chloride electrolysis by ion exchange membrane process is a method for electrolyzing brine using electrode for electrolysis to thereby produce caustic soda, chlorine, and hydrogen
Data Source
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AI summary
An electrode for electrolysis according to the present invention is an electrode for electrolysis including a conductive substrate; and a catalyst layer formed on a surface of the conductive substrate, wherein the catalyst layer comprises ruthenium element, iridium element, titanium element, and at least one first transition metal element selected from the group consisting of Sc, V, Cr, Fe, Co, Ni, Cu, and Zn, a content ratio of the first transition metal element contained in the catalyst layer based on 1 mol of the titanium element is 0.25 mol % or more and less than 3.4 mol %, and a D value being an indicator of an electric double layer capacitance of the electrode for electrolysis is 120 C/m2 or more and 420 C/m2 or less.