Bipolar Membrane Interface Using Basic Metal Chloride Catalysts
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bipolar membranes suffer from membrane delamination and high water splitting voltage fluctuations due to the use of metal oxides and heavy metal ions as water splitting catalysts, leading to low durability and increased voltage over time.
Innovation Solution
Distribute particles of basic metal chloride, such as Sn or Ru chloride, in the interface between cation-exchange and anion-exchange membranes, adjusting concentration and pH to maintain low water splitting voltage over extended periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dense layer of metal oxide is provided in the interface between the cation-exchange membrane and the anion-exchange membrane, then the water splitting catalyst function is improved, but the membrane is liable to be delaminated after extended use
Solution Approach 1:
The patent changes the physical state of the catalyst from a dense layer to dispersed particles, and modifies the chemical composition by using basic metal chloride instead of metal oxide. This parameter change allows the catalyst to maintain functionality while preventing delamination by distributing stress and improving interfacial adhesion.
Solution Approach 2:
The basic metal chloride particles act as an intermediary substance between the cation-exchange membrane and anion-exchange membrane. These particles improve the interfacial adhesion while providing catalytic function, serving as a mediator that resolves the conflict between catalyst performance and membrane bonding.
2Reliability
If metal oxide particles are formed on the surface of the exchange membrane and then buried by pressing treatment, then the catalyst is fixed in the membrane, but the productivity is low
Solution Approach 1:
The basic metal chloride particles are pre-dispersed in the interface layer before the membranes are fully assembled and activated. This preliminary distribution of catalyst particles eliminates the need for subsequent pressing treatment to fix the catalyst, thereby improving productivity while ensuring reliable catalyst fixation.
3Reliability
If heavy metal ions such as tin or ruthenium are used as water splitting catalyst, then the catalytic activity is improved, but the catalyst disappears when electric current is turned on and off repetitively, causing water splitting voltage to increase
Solution Approach 1:
The patent uses basic metal chloride as a composite material that combines the high catalytic activity of heavy metal ions with the stability of a solid particle structure. The basic chloride formulation provides a stable matrix that retains the active metal ions, preventing their disappearance during repeated cycling while maintaining high catalytic activity.
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 bipolar membrane maintains a low water splitting voltage of 1.1 to 1.4 V initially and up to 1.7 V after endurance testing, preventing membrane delamination and ensuring stable catalytic function.
Implementation Method 1
a function of establishing a phenomenon called water splitting which dissociates the water in the membrane into protons and hydroxide ions when a voltage is applied to both sides of the bipolar membrane
Implementation Method 2
provide a water splitting catalyst in the interface between the cation-exchange membrane and the anion-exchange membrane to accelerate the dissociation
Implementation Method 3
a cation-exchange membrane and an anion-exchange membrane are stuck together
Data Source
AI summary
A bipolar membrane BP characterized in that particles 5 of a basic metal chloride are distributed in the interface between a cation-exchange membrane 1 and an anion-exchange membrane 3.