Electrolysis Anode with Uniform Catalyst Layer for Low Overvoltage
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Solution Overview
Problem
Current anodes for brine electrolysis exhibit high overvoltage and limited lifetime, which hampers their efficiency and stability in commercial chlor-alkali processes.
Innovation Solution
An anode with a catalyst layer composed of ruthenium, iridium, titanium, and platinum, where the iridium composition is uniformly distributed with a standard deviation of 0.40 or less, is developed using electrostatic spray deposition to reduce overvoltage and enhance lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a composite oxide catalyst layer including ruthenium, iridium, titanium, and platinum is used, then chlorine generating reaction activity and stability are improved, but overvoltage increases and lifetime decreases
Solution Approach 1:
The patent optimizes the compositional parameters of the catalyst layer by precisely controlling the ratios of ruthenium (20-40 wt%), iridium (10-30 wt%), titanium (20-50 wt%), and platinum (5-20 wt%). This parameter optimization achieves a balance between high chlorine generating activity and low overvoltage, resolving the contradiction between stability and energy consumption
Solution Approach 2:
The patent creates a composite oxide catalyst layer combining four different metal oxides (RuO2, IrO2, TiO2, PtO2) to achieve synergistic effects. The composite structure provides both high stability for chlorine generation and low overvoltage characteristics, overcoming the limitations of single-metal catalysts
2Reliability
If a composite oxide catalyst layer including ruthenium, iridium, titanium, and platinum is used, then chlorine generating reaction activity and stability are improved, but lifetime is not excellent
Solution Approach 1:
The composite oxide structure combines the high catalytic activity of ruthenium and iridium with the stability and longevity of titanium and platinum oxides. This multi-metal composition ensures both immediate performance and long-term durability, resolving the contradiction between stability and lifetime
Solution Approach 2:
The patent optimizes the thickness parameter of the catalyst layer (5-20 micrometers) and the compositional ratios to ensure long-term stability. The controlled parameters prevent degradation while maintaining high activity, achieving excellent lifetime alongside stability
3Manufacturing precision
If electrostatic spray deposition is used to deposit the catalyst layer, then uniform distribution of active material is achieved, but overvoltage increases
Solution Approach 1:
The patent controls the deposition parameters of electrostatic spray deposition to achieve optimal coating thickness (5-20 micrometers) and uniform distribution. By precisely managing these parameters, the method achieves both high uniformity (standard deviation ≤0.40) and low overvoltage through efficient active material distribution
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 reduced overvoltage, improved durability, and suppressed oxygen generation during electrolysis, leading to enhanced efficiency and stability.
Implementation Method 1
both surfaces of a pretreated metal base are coated with a composition for forming a catalyst layer by electrostatic spray deposition
Implementation Method 2
the coating is dried and heat-treated
Implementation Method 3
the coating is dried and heat-treated
Data Source
AI summary
The present invention relates to an anode for electrolysis, which includes a metal base, and a catalyst layer disposed on at least one surface of the metal base, wherein the catalyst layer includes a composite metal oxide of ruthenium, iridium, titanium, and platinum, and a metal in the composite metal oxide does not include palladium, wherein, when the catalyst layer is equally divided into a plurality of pixels, a standard deviation of iridium compositions of the plurality of equally divided pixels is 0.40 or less, and a method of preparing the same, wherein the present invention may provide an anode for electrolysis having reduced overvoltage and improved lifetime while exhibiting high efficiency and a method of preparing the same.