Electrochemical Cell with Porous Cathode for CO2-to-Liquid Conversion
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Solution Overview
Problem
Existing electrochemical cells for converting CO2 into liquid chemicals face challenges such as low reaction rates due to poor solubility and depletion of CO2 near the catalyst, leading to inefficient conversion and high energy consumption.
Innovation Solution
An electrochemical cell design with a cathodic compartment containing a porous support with a metal catalyst, separated by an anion exchange membrane, and using a liquid electrolyte solution with 0.1M-10M concentration, where anions diffuse to the anodic compartment, facilitating the conversion of CO2 into C1-C2 liquid organic by-products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CO2 is dissolved in electrolyte in H-cell configuration, then the electrochemical conversion can be monitored, but the reaction rates are limited due to poor solubility and depletion of CO2 near the catalyst
Solution Approach 1:
The patent employs a gas diffusion electrode with porous structure that allows CO2 gas to diffuse directly to the catalyst surface through the porous support, bypassing the limitation of CO2 solubility in liquid electrolyte. This enables high reaction rates by providing continuous supply of CO2 reactant directly at the catalytic sites.
Solution Approach 2:
The patent introduces a gas diffusion layer as an intermediary component between the CO2 gas phase and the liquid electrolyte phase. This intermediary layer facilitates the transport of CO2 molecules to the catalyst surface without requiring dissolution in the bulk electrolyte, thus overcoming the solubility bottleneck.
2Productivity
If copper-based catalysts are used to convert CO2 into complex molecules, then direct conversion to C2+ products is achieved, but selective conversion to one product with high faradaic efficiency remains difficult
Solution Approach 1:
The patent uses a composite catalyst system where different metallic components are positioned in specific locations or have specific functions within the catalyst structure. This local differentiation of catalytic properties enables selective promotion of desired reaction pathways while suppressing unwanted side reactions, achieving both high conversion and high selectivity.
Solution Approach 2:
The patent employs composite catalyst materials combining multiple metallic components with complementary properties. This composite structure synergistically enhances both the activity (conversion efficiency) and selectivity of the catalyst by utilizing the strengths of each component while mitigating their individual weaknesses.
3Manufacturing precision
If post-transition metals are used to convert CO2 into formic acid with high selectivity, then high faradaic efficiency is achieved, but the conversion is limited to C1 products only
Solution Approach 1:
The patent merges the advantages of different catalyst types by combining post-transition metal components (which provide high selectivity for formic acid production) with copper-based components (which enable C2+ product formation). This merged catalyst system simultaneously achieves high selectivity and the ability to produce complex liquid organic products.
4Use of energy by moving object
If CO2 is converted into CO through electrochemical reduction, then high current density at low potential is achieved, but additional energy intensive Fischer-Tropsch process is required
Solution Approach 1:
The patent implements continuous electrochemical conversion of CO2 directly to liquid organic products in a single integrated electrochemical cell, eliminating the need for separate Fischer-Tropsch processing steps. This continuous one-step process maintains energy efficiency while simplifying the overall工艺流程.
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 design enhances CO2 conversion efficiency, achieving high faradaic efficiency and selectivity towards formate and formic acid, with a current density above 100 mA/cm2 and faradaic efficiency above 50%, reducing energy consumption and improving product separation.
Implementation Method 1
anions of the electrolyte solution are adapted to diffuse from the cathodic compartment to the anodic compartment through the anion exchange membrane
Implementation Method 2
the catalyst converts electrochemically the carbon dioxide into C1-C2 liquid organic by-products
Data Source
AI summary
An electrochemical cell configured for reducing carbon dioxide; it has an anode electrode; a cathode electrode comprising a porous support including metal acting as a catalyst; an anion exchange membrane, wherein the anion exchange membrane separates an anodic compartment from a cathodic compartment; the anolyte and the catholyte are composed of a liquid electrolyte solution with a concentration between 0.1M-10M, wherein anions of the electrolyte solution is adapted to diffuse from the cathodic compartment to the anodic compartment through the anion exchange membrane, wherein the carbon dioxide contacts the cathode electrode and the catalyst converts electrochemically the carbon dioxide into C1-C2 liquid organic biproducts and anions as at the catholyte; wherein the cathode electrode and the anode electrode are electrically connected through one of current collector plates; and a wired connection.