Reduction Electrode Active Layer Composition for Brine Electrolysis
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Solution Overview
Problem
The existing reduction electrodes for brine electrolysis face challenges with performance stability and durability, particularly due to overvoltage issues and deviations in performance before and after activation.
Innovation Solution
An active layer composition for the reduction electrode is developed, comprising a metal precursor mixture of ruthenium, platinum, and lanthanide metal precursors, along with an organic solvent containing an amine-based compound, which is applied to a metal substrate to form a durable and low-overvoltage electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional reduction electrodes (stainless steel or nickel) are used for brine electrolysis, then the electrode structure is simple and cost-effective, but overvoltage occurs and performance stability deteriorates
Solution Approach 1:
The patent applies composite materials by combining ruthenium oxide, platinum oxide, and lanthanide metal oxides (such as cerium oxide) to form a multi-component active layer on the reduction electrode. This composite structure synergistically improves catalytic activity and performance stability while managing overvoltage, resolving the contradiction between reliability and structural simplicity.
Solution Approach 2:
The patent changes the chemical composition parameters of the electrode surface by incorporating specific ratios of ruthenium precursor (0.1-1.0 mmol), platinum precursor (0.05-0.5 mmol), and lanthanide metal precursor (0.1-1.0 mmol). This parameter optimization enhances electrocatalytic performance and stability without excessive structural complexity.
2Productivity
If the electrode is activated to improve performance, then initial activity increases, but performance deviation between before and after activation occurs and durability decreases
Solution Approach 1:
The patent applies preliminary action by pre-forming a stable composite oxide layer on the electrode surface during manufacturing, incorporating lanthanide metal oxides that create a durable structural framework. This preliminary structuring ensures consistent performance before and after activation, reducing performance deviation and improving reliability while maintaining productivity.
3Reliability
If platinum group metals (ruthenium, platinum) are used to reduce overvoltage, then electrocatalytic activity improves, but cost increases and deterioration by reverse current occurs
Solution Approach 1:
The patent combines ruthenium oxide and platinum oxide with lanthanide metal oxides (particularly cerium oxide) to create a composite active layer. The lanthanide component provides structural stability and resistance to reverse current deterioration, while the platinum group metals deliver low overvoltage. This composite approach mitigates the harmful effects on precious metals while maintaining electrocatalytic performance.
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 solution significantly improves the durability of the reduction electrode and suppresses overvoltage, maintaining consistent performance before and after activation, thereby enhancing reliability and reducing the need for activation processes.
Implementation Method 1
2H2O+2e−→2OH−+H2(E0=−0.83 V) Reduction electrode reaction
Implementation Method 2
an organic solvent containing a bromine-based compound
Data Source
AI summary
Provided is an active layer composition of a reduction electrode for brine electrolysis containing a metal precursor mixture containing a ruthenium precursor, a platinum precursor, and a lanthanide metal precursor, and an organic solvent containing an alcohol-based compound and an amine-based compound. Also provided is a reduction electrode containing a metal substrate and an active layer that is a dried and heat treated active layer composition positioned on the metal substrate.