Membrane Reactor for CO2 Electrochemical Conversion
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Solution Overview
Problem
Existing electrolytic cells for electrochemical CO2 reduction have low conversion efficiencies and flux, limiting their commercial application.
Innovation Solution
A membrane reactor design featuring a porous conductive layer with a trickle bed structure, a solid electrolyte separator, and catalyst particles, which allows for efficient electrochemical reduction of CO2 by optimizing proton and electron transfer rates, and using a fuel cell for power generation to enhance conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If electrolytic cells are used for electrochemical reduction of CO2, then the conversion process can be performed with low cost and simple fabrication system, but the conversion efficiency and flux are low
Solution Approach 1:
The patent employs a porous electrode structure with high surface area to volume ratio, which significantly enhances the reaction sites available for CO2 reduction. The porous structure allows efficient mass transport of CO2 and electrolyte while maintaining high current density, thereby resolving the contradiction between simple fabrication and high conversion efficiency.
Solution Approach 2:
The patent optimizes key parameters including electrolyte composition (using carbonate buffers), electrode potential, and flow rate to maximize conversion efficiency. By carefully controlling pH, CO2 partial pressure, and applied voltage, the system achieves high flux and conversion efficiency while maintaining the simplicity of the electrolytic cell design.
2Temperature
If electrolytic cells are used for electrochemical reduction of CO2, then the operation conditions can be kept mild, but the conversion efficiency and flux are low
Solution Approach 1:
The patent achieves high conversion efficiency under mild temperature conditions by optimizing electrolyte composition and flow dynamics. The use of carbonate buffer systems and controlled CO2 saturation allows efficient reaction kinetics at ambient or near-ambient temperatures, eliminating the need for high temperature operation while maintaining high productivity.
3Device complexity
If conventional electrolytic cells are used, then the system structure can be simple, but the flux and conversion rate are insufficient for commercial application
Solution Approach 1:
The patent uses porous electrodes with optimized pore size distribution and high porosity to dramatically increase the effective surface area for CO2 reduction. This structural modification enhances flux and conversion rate while maintaining a relatively simple overall system configuration, making the technology viable for commercial application.
Solution Approach 2:
The patent transitions from traditional planar electrode geometry to three-dimensional porous structures, effectively adding a dimensional aspect that increases reaction surface area without proportionally increasing device volume or complexity. This dimensional change enables high flux and conversion efficiency within a compact system.
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 membrane reactor achieves high conversion efficiency of CO2 to useful organic substances, with current efficiencies and conversion rates exceeding 80% and 90% respectively, enabling efficient and sustainable energy development.
Implementation Method 1
a solid electrolyte separator (260) disposed in the cavity (20)
Implementation Method 2
The plurality of cathode catalyst particles (2204) are used to electrochemically reduce the CO2 gas
Implementation Method 3
optimizing proton and electron transfer rates
Data Source
AI summary
A method for electrochemically converting a carbon dioxide gas into expected products includes using a member reactor. In the method, a membrane reactor includes a cavity, a solid electrolyte membrane separator, a cathode, an anode, and a fuel cell is provided. A cathode electrolyte and the carbon dioxide gas are passed through the cathode, and an anode electrolyte and an anode active material are passed through the anode chamber at the same time. An electrolytic voltage is applied to decompose the carbon dioxide gas into expected products. The expected products include a hydrogen gas and an oxygen gas which are fed back to the fuel cell to generate electric power.