Catalyst Layer with Cyclic Amine Polymer for CO2 Electrolysis
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Solution Overview
Problem
Existing electrochemical cells for converting CO2 into useful products face challenges in achieving high currents, energy efficiencies, and selectivities without the continuous introduction of co-reactants, particularly requiring high voltages and suffering from reduced performance when co-reactants like KOH are recycled.
Innovation Solution
An electrolyzer cathode catalyst layer is developed, comprising catalytically active chemical elements and an anion conducting polymer with positively charged cyclic amine groups, such as imidazoliums and pyridiniums, which enhances the electrochemical conversion of CO2 at lower voltages and maintains performance without continuous co-reactant addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrochemical cells are used to convert CO2 into useful products, then high currents can be achieved, but high voltages are required and energy efficiency is reduced
Solution Approach 1:
The patent changes the chemical environment parameters by introducing a specific ionic liquid composition and catalyst system that enables high current densities at lower voltages. The ionic liquid serves as both electrolyte and co-reactant, fundamentally altering the electrochemical parameters of the system to achieve improved energy efficiency while maintaining high productivity.
Solution Approach 2:
The patent employs a composite catalyst system consisting of multiple metal components (such as Cu-Zn-Al or Cu-Ni) supported on specific materials, combined with ionic liquid electrolytes. This composite approach creates synergistic effects that reduce overpotential and enable high current densities at lower operating voltages, resolving the contradiction between productivity and energy consumption.
2Productivity
If co-reactants like KOH are continuously added to maintain performance, then selectivity and current can be maintained, but device complexity and operational requirements increase
Solution Approach 1:
The ionic liquid in the patent serves multiple functions simultaneously: it acts as electrolyte, solvent, and co-reactant that can be regenerated in situ. The system is designed to maintain performance without requiring external addition of co-reactants, as the ionic liquid participates in the reaction cycle and can be recovered and reused, eliminating the need for continuous operational intervention.
Solution Approach 2:
The patent employs an ionic liquid that can be recovered and reused after participating in the CO2 conversion reaction. Unlike conventional co-reactants that are consumed and require continuous addition, the ionic liquid is regenerated during the process or can be easily separated and reused, significantly reducing operational complexity and maintaining high current densities without continuous material input.
3Quantity of substance
If conventional catalysts are used, then CO2 conversion can proceed, but selectivity and energy efficiency are reduced
Solution Approach 1:
The patent employs catalysts with specific local active sites and compositions tailored for selective CO2 conversion. The multi-component catalyst systems (such as Cu-Zn-Al or Cu-Ni) provide different local environments that favor specific reaction pathways, enabling high selectivity for desired products while maintaining high overall conversion rates. The ionic liquid also provides a localized chemical environment that enhances selectivity.
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 catalyst layer achieves high currents and selectivities at lower voltages, improving the efficiency and stability of CO2 electrolysis, reducing energy consumption and maintaining performance over time, as demonstrated by increased current densities and selectivity in CO2 conversion experiments.
Implementation Method 1
an anion conducting polymer with positively charged cyclic amine groups
Implementation Method 2
catalytically active chemical elements and an anion conducting polymer, wherein the ion conducting polymer is comprised of positively charged cyclic amine groups
Implementation Method 3
electrolyzer cathode catalyst layer... enhances the electrochemical conversion of CO2
Data Source
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.