Electrochemical Reaction Device Segmentation for CO2 Reduction Efficiency
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Solution Overview
Problem
Existing electrochemical reaction devices for converting sunlight to chemical energy have low conversion efficiency due to the two-stage excitation process required for reducing carbon dioxide, which limits the effectiveness of energy storage.
Innovation Solution
The electrochemical reaction device employs a configuration with multiple electrolytic solution tanks and electrode layers, utilizing ion exchange membranes and photoelectric conversion layers to facilitate oxidation-reduction reactions, allowing for the efficient conversion of sunlight to chemical energy by optimizing the pH differences and hydrogen ion concentrations between tanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a two-electrode device with oxidation catalyst and reduction catalyst is used, then the device can convert sunlight to chemical substances, but the conversion efficiency from sunlight to chemical energy is low due to two-stage excitation
Solution Approach 1:
The device is divided into multiple electrolytic solution tanks (first tank with first and second storage parts, second tank with third and fourth storage parts) separated by ion exchange membranes. This segmentation allows independent optimization of pH environments in different compartments, enabling more efficient electrochemical reactions for CO2 reduction and H2O oxidation simultaneously, thereby improving overall conversion efficiency while reducing energy loss through better utilization of photoelectric conversion.
2Productivity
If multiple electrolytic solution tanks with ion exchange membranes are used, then ion migration is promoted and reaction variations are reduced, but device complexity increases
Solution Approach 1:
The device employs a nested structure where electrolytic solution tanks are divided into multiple storage parts (first, second, third, fourth storage parts) within each tank. Ion exchange membranes are positioned between these storage parts, creating a compact nested arrangement that maximizes functional separation while minimizing overall device footprint. This nested design promotes ion migration through the membranes while maintaining a space-efficient configuration that partially offsets the added structural complexity.
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
This configuration enhances the conversion efficiency from light to chemical energy by promoting the migration of ions and reducing reaction variations across the device, leading to improved energy storage capabilities.
Implementation Method 1
an electrochemical reaction device including a stack (silicon solar cell or the like) of a pair of electrodes and a photoelectric conversion layer sandwiched therebetween
Implementation Method 2
The electrode on a light irradiated side oxidizes water (2H2O) using light energy to produce oxygen (O2) and hydrogen ions (4H+)
Implementation Method 3
The electrode having the reduction catalyst obtains the potential from the electrode that causes the oxidation reaction, thereby reducing carbon dioxide to produce formic acid (HCOOH) or the like
Implementation Method 4
utilizing ion exchange membranes and photoelectric conversion layers to facilitate oxidation-reduction reactions
Data Source
AI summary
An electrochemical reaction device includes: a first electrolytic solution tank having a first storage part and a second storage part; a second electrolytic solution tank having a third storage part and a fourth storage part; a first reduction electrode layer immersed in a first electrolytic solution; a first oxidation electrode layer immersed in a second electrolytic solution; a first generator electrically connected to the first reduction electrode and the first oxidation electrode layer; a second reduction electrode layer immersed in a third electrolytic solution; a second oxidation electrode layer immersed in a fourth electrolytic solution; a second generator electrically connected to the second reduction electrode and the second oxidation electrode layer; and at least one flow path out of a first flow path connecting the first storage part and the fourth storage part and a second flow path connecting the second storage part and the third storage part.