Electrolyzer Catalyst Layer With Cyclic Amine Polymers
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Solution Overview
Problem
Existing electrochemical cells for converting CO2 into useful products face challenges in achieving high energy efficiencies, currents, and selectivities without the continuous introduction of co-reactants, particularly requiring high voltages or continuous additions of KOH, which can lead to reduced performance.
Innovation Solution
An electrolyzer cathode catalyst layer incorporating catalytically active elements and an anion conducting polymer with positively charged cyclic amine groups, such as tetra-methyl-imidazolium, pyrazoliums, and pyrrolidiniums, is used, allowing for high currents at lower voltages and improved selectivity without continuous reactant introduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrochemical cells use high voltages to achieve high currents for CO2 conversion, then current density improves, but energy efficiency deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte by introducing an anion conducting polymer with positively charged cyclic amine groups. This modification alters the ionic conductivity and electrochemical environment, enabling high current densities at lower applied voltages, thus improving energy efficiency while maintaining productivity
Solution Approach 2:
The patent uses a composite catalyst layer combining metal nanoparticles (catalytically active elements) with an anion conducting polymer matrix. This composite structure provides both catalytic activity for CO2 reduction and enhanced ionic conductivity, allowing efficient electron and ion transfer at lower voltages, resolving the contradiction between current density and energy efficiency
2Productivity
If conventional electrochemical cells continuously add co-reactants like KOH to maintain performance, then CO2 conversion continues, but system complexity and operational burden increase
Solution Approach 1:
The anion conducting polymer in the catalyst layer provides self-sustaining ionic conductivity and facilitates automatic ion transport during operation. The polymer's intrinsic properties enable continuous CO2 conversion without requiring external addition of co-reactants, as the polymer itself manages the ionic balance and conductivity throughout the process
Solution Approach 2:
The patent achieves continuous CO2 conversion through the stable, ongoing ionic conductivity provided by the anion conducting polymer. The polymer maintains consistent electrochemical performance over time, enabling uninterrupted operation without periodic interruptions for reactant addition, thus simplifying the system while maintaining productivity
3Reliability
If conventional catalysts are used in electrolyzers, then basic catalytic activity is achieved, but selectivity and energy efficiency remain limited
Solution Approach 1:
The patent creates a composite catalyst layer combining metal nanoparticles with an anion conducting polymer. The polymer component enhances ionic conductivity and creates a favorable electrochemical environment, while the metal provides catalytic activity. This synergy improves reaction selectivity and reduces energy losses compared to conventional catalysts alone
Solution Approach 2:
The introduction of the anion conducting polymer changes the local electrochemical parameters at the catalyst surface, including ionic concentration, conductivity, and pH environment. These parameter changes optimize the reaction conditions for selective CO2 reduction, improving both selectivity and energy efficiency simultaneously
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 enables efficient CO2 conversion with enhanced current densities and selectivities at reduced voltages, achieving significant energy efficiency and stability in CO2 electrolysis, surpassing previous limitations by using anion conducting polymers with specific cyclic amines in the catalyst layer.
Implementation Method 1
The catalyst layer contains one or more catalytically active chemical elements and an anion conducting polymer, wherein the ion conducting polymer is comprised of positively charged cyclic amine groups
Implementation Method 2
Catalysts can be placed on the anode, the cathode, and/or in the electrolyte to promote the desired chemical reactions
Implementation Method 3
In an electrolytic cell, voltage is then applied between the anode and the cathode to promote the desired electrochemical reaction
Data Source
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AI summary
A catalyst layer for an electrochemical device comprises a catalytically active element and an ion conducting polymer. The ion conducting polymer comprises positively charged cyclic amine groups. The ion conducting polymer comprises at least one of an imidazolium, a pyridinium, a pyrazolium, a pyrrolidinium, a pyrrolium, a pyrimidium, a piperidinium, an indolium, a triazinium, and polymers thereof. The catalytically active element comprises at least one of V, Cr, Mn, Fe, Co, Ni, Cu, Sn, Zr, Nb, Mo, Ru, Rh, Pd, Ag, Cd, Hf, Ta, W, Re, Ir, Pt, Au, Hg, Al, Si, In, Tl, Pb, Bi, Sb, Te, U, Sm, Tb, La, Ce and Nd. In an electrolyzer comprising the present catalyst layer, the feed to the electrolyzer comprises at least one of CO2 and H2O.