Electrochemical Reaction Device With Segmented Electrolytes
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Solution Overview
Problem
Current photoelectrochemical devices for converting sunlight into chemical energy have low conversion efficiency due to the two-stage reduction potential required for carbon dioxide conversion, leading to inefficient energy storage compared to electricity storage.
Innovation Solution
An electrochemical reaction device with separate reduction and oxidation electrodes immersed in distinct electrolytic solutions, where the reduction electrode is in contact with a liquid phase containing water and an organic solvent, and the oxidation electrode is in contact with a liquid phase containing a substance to be oxidized, utilizing a pH difference and ion exchange membrane to enhance reaction efficiency and selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a two-electrode type device with both reduction and oxidation catalysts is used, then the device structure is simplified, but the conversion efficiency from sunlight to chemical energy is low
Solution Approach 1:
The device is divided into two separate electrochemical cells: a first cell containing the reduction electrode with reduction catalyst, and a second cell containing the oxidation electrode with oxidation catalyst. This segmentation allows each electrode to operate under optimized conditions independently, resolving the contradiction between structural simplicity and conversion efficiency.
2Device complexity
If both electrodes are immersed in the same electrolytic solution, then the device structure is simplified, but the reaction selectivity and efficiency are reduced
Solution Approach 1:
The electrolytic solution is segmented into a first electrolytic solution in the reduction cell and a second electrolytic solution in the oxidation cell, allowing each reaction to proceed under optimized pH and compositional conditions, thereby maintaining high reaction selectivity while avoiding the complexity of a single unified system.
Solution Approach 2:
A proton exchange membrane serves as an intermediary between the two electrolytic solutions, enabling selective ion transport while maintaining separation of the reduction and oxidation environments. This resolves the contradiction by providing controlled interaction between the two cells without direct mixing of electrolytes.
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 increases the conversion efficiency of sunlight to chemical energy by optimizing the reaction conditions, allowing for higher production rates of compounds like carbon monoxide and formic acid, while reducing energy storage costs and losses.
Implementation Method 1
a photoelectric conversion body (33) having a light-receiving surface facing the oxidation electrode
Implementation Method 2
an electrode having a reduction catalyst for reducing carbon dioxide
Implementation Method 3
an electrode having an oxidation catalyst for oxidizing water (H2O)
Implementation Method 4
utilizing a pH difference and ion exchange membrane to enhance reaction efficiency and selectivity
Data Source
AI summary
An electrochemical reaction device includes: an electrolytic solution tank including a first storage part storing a first electrolytic solution and a second storage part storing a second electrolytic solution; a reduction electrode immersed in the first electrolytic solution; and an oxidation electrode immersed in the second electrolytic solution. The second electrolytic solution contains a substance to be oxidized. The first electrolytic solution has a first liquid phase containing water and a second liquid phase containing an organic solvent and being in contact with the first liquid phase. At least one liquid phase of the first liquid phase or the second liquid phase contains a substance to be reduced and is in contact with the reduction electrode.