Anion-Conducting Membrane Polymer for Stable Water Electrolysis
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Solution Overview
Problem
Current anion-conducting membranes for water electrolysis suffer from low long-term stability, leading to a rapid degradation of ionic conductivity under harsh electrochemical conditions, which reduces the efficiency and increases energy consumption in electrochemical cells.
Innovation Solution
Development of polymeric compounds with a specific chemical structure, including a tertiary carbon atom and aromatic rings bonded to oxygen atoms, which are synthesized using a process involving commercially available precursors and reaction steps under controlled conditions, resulting in membranes with improved long-term stability and ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anion exchange membranes are used, then initial ionic conductivity is achieved, but long-term stability is poor and ionic conductivity degrades rapidly under harsh electrochemical conditions
Solution Approach 1:
The patent modifies the chemical structure parameters of the membrane material by introducing specific aromatic ring structures with oxygen atoms bonded to them, and adjusting the quaternary ammonium group configurations. These parameter changes in molecular structure enhance the membrane's chemical stability and resistance to degradation under harsh electrochemical conditions, thereby improving long-term reliability without sacrificing initial ionic conductivity
Solution Approach 2:
The patent creates a composite membrane structure combining polyaromatic polymer backbone with ether bonds and quaternary ammonium groups attached at specific positions. This composite material design integrates the structural stability of aromatic rings with the ionic conductivity function of quaternary ammonium groups, achieving both high initial conductivity and extended operational lifespan by resisting chemical degradation
2Productivity
If membrane material is subjected to harsh electrochemical conditions, then water electrolysis process operates, but molecular structure degrades leading to loss of ionic conductivity
Solution Approach 1:
The patent incorporates chemically stable aromatic ring structures with ether bonds into the membrane backbone before exposure to harsh electrochemical conditions. These pre-introduced stable structural elements act as a protective framework that resists oxidation and chemical degradation during water electrolysis, preventing molecular structure breakdown and maintaining ionic conductivity throughout the operational lifecycle
Solution Approach 2:
The patent avoids using vulnerable chemical structures that would require frequent membrane replacement. By designing a durable membrane with inherent resistance to electrochemical degradation, the solution eliminates the need for short-lived membrane materials, reducing operational downtime and maintenance costs associated with frequent replacements
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 new compounds maintain a high level of ionic conductivity for an extended period, significantly enhancing the long-term stability and efficiency of electrochemical cells, reducing energy consumption and extending membrane lifespan.
Implementation Method 1
the membrane needs to be conductive for ions (cations or anions), while almost impermeable for hydrogen and oxygen gas... the ability to let ions pass while electrons are isolated, is called ionic conductivity
Implementation Method 2
One important example for an electrochemical process is electrolysis of water to gain molecular hydrogen and molecular oxygen
Data Source
AI summary
The present invention provides compounds, especially polymeric compounds, a process for preparation thereof and for the use of these compounds. Intended use is in the field of electro-chemistry. Anion-conducting properties of disclosed compounds making this material suitable for the preparation of anion-conducting membranes. The object of the present invention is therefore to provide material having an ionic conductivity that is stable over long period of time. This object is solved by compounds containing at least one unit of the formula (I) wherein X being a ketone or sulfone group, wherein Z being a structure element comprising at least one tertiary carbon atom and at least one aromatic 6-ring directly bonded to one of the oxygen atoms, and wherein Y being a structure element comprising at least one nitrogen atom with a positive charge and Y being bonded to said tertiary carbon atom of Z.