CO2 Reduction System Using Segmented Electrolytic Baths
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Solution Overview
Problem
Current artificial photosynthesis systems for reducing CO2 lack efficiency in mimicking the z-scheme process of plants, which is essential for effective carbon dioxide reduction using light energy.
Innovation Solution
A producing system comprising a chemical reaction apparatus with oxidation and reduction reaction electrolytic baths, a catalyst system, and a separation unit that utilizes electrolytic solutions and ionic liquids to enhance CO2 reduction and product recovery, including the use of specific reduction catalysts capable of reducing CO2 and intermediate products like formic acid, formaldehyde, and ethylene glycol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional artificial photosynthesis systems are used to reduce CO2, then the system can perform CO2 reduction, but the efficiency is low due to inability to properly mimic the z-scheme process
Solution Approach 1:
The system divides the CO2 reduction process into two distinct stages mimicking the plant z-scheme: (1) water oxidation at the anode to generate electrons and oxygen, and (2) CO2 reduction at the cathode using those electrons to produce fuels. This segmentation allows each half-reaction to be optimized independently with appropriate catalysts and conditions, achieving both high efficiency and accurate z-scheme mimicry
Solution Approach 2:
The patent introduces an electrolytic solution as an intermediary medium that facilitates electron transfer between the oxidation and reduction reactions. The electrolyte enables ionic conduction to maintain charge balance while allowing the two half-reactions to occur in separate compartments, thereby achieving efficient electron utilization and accurate z-scheme process reproduction
2Productivity
If the concentration of reduction products in the electrolytic solution increases, then the recovery efficiency improves, but the separation difficulty increases
Solution Approach 1:
The patent utilizes phase transition differences between the electrolytic solution and reduction products (methanol, ethanol, ethylene glycol) to enable simple separation. By controlling temperature and pressure conditions, the reduction products can be selectively condensed or vaporized while the electrolytic solution remains in its original phase, achieving efficient separation without complex equipment
Solution Approach 2:
The system changes physical parameters such as temperature and pressure to optimize both product concentration in the electrolytic solution and subsequent separation. By adjusting these parameters, the solubility and volatility of reduction products are controlled, allowing high concentration accumulation followed by straightforward phase-based separation
Data Source
AI summary
A producing system of reduction product of carbon dioxide includes a chemical reaction apparatus including an oxidation reaction electrolytic bath and a reduction reaction electrolytic bath, the chemical reaction apparatus configured to generate a reduction product by reducing carbon dioxide, an electrolytic solution supply unit supplying an electrolytic solution to the reduction reaction electrolytic bath, a carbon dioxide supply unit configured to dissolve carbon dioxide into the electrolytic solution, the carbon dioxide supply unit serving to sustain a reduction reaction in the reduction reaction electrolytic bath, and a separation unit configured to separate the reduction product from the electrolytic solution.