Reduction Catalyst with Quaternary Nitrogen for CO2 Conversion
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Solution Overview
Problem
Current technologies for CO2 reduction via artificial photochemical reactions have low efficiency due to interconnection resistance and require sacrificial reagents, with existing reduction catalysts not effectively utilizing light energy for high reaction efficiency.
Innovation Solution
A reduction catalyst with a charge collector and modified organic molecules containing quaternary nitrogen cations, which are chemically bound to a metal layer, enhancing CO2 reduction efficiency by promoting selective reactions with low energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a photochemical reactor with electrodes and photocatalysts is used for CO2 reduction, then CO2 reduction reaction can occur, but solar energy conversion efficiency is very low at around 0.04% due to low energy efficiency of photocatalyst and interconnection resistance
Solution Approach 1:
The invention extracts and eliminates the photocatalyst component from the photochemical reactor system. By removing the photocatalyst, the system avoids its low energy efficiency (0.04% solar energy conversion) and replaces it with a direct silicon solar cell-based electrochemical system that achieves much higher energy conversion efficiency while maintaining CO2 reduction capability.
Solution Approach 2:
The invention substitutes the photocatalyst-based photochemical reaction system with an electrochemical system using silicon solar cells. This replacement transitions from a photochemical mechanism to an electrochemical mechanism, eliminating the need for photocatalysts and achieving superior energy conversion efficiency.
2Productivity
If electrodes are connected with electric wire to transfer electrons for CO2 reduction, then reduction reaction can proceed, but efficiency in extracting electricity decreases due to interconnection resistance
Solution Approach 1:
The invention merges the electron generation function (silicon solar cell) and electron consumption function (CO2 reduction reaction) into a single integrated device structure. The silicon solar cell and catalyst layers are directly combined without external wiring, eliminating interconnection resistance and achieving efficient electron transfer for CO2 reduction.
3Ease of manufacture
If a plate-like laminated structure with silicon solar cell is used, then device can be easily increased in size and no wiring is required, but CO2 reduction reaction does not proceed effectively because ions need to move to opposite sides
Solution Approach 1:
The invention applies local quality by creating distinct functional zones within the device: a catalyst layer configured to promote CO2 reduction reaction at specific locations, and an ion movement path that enables efficient ion transport. This localized functional design allows the plate-like structure to maintain both scalability and effective CO2 reduction performance.
Solution Approach 2:
The invention introduces an ion movement path as an intermediary component that facilitates ion transport between different regions of the device. This intermediary structure enables ions to move efficiently to the opposite sides where needed, resolving the limitation of the plate-like laminated structure while maintaining its scalability advantages.
4Quantity of substance
If a large number of electrons are required for CO2 reduction to produce hydrocarbons, then desired hydrocarbon can be produced, but reduction reaction becomes more difficult to advance with Faraday efficiency
Solution Approach 1:
The invention changes the chemical and physical parameters of the catalyst layer to optimize CO2 reduction performance. By configuring specific catalyst materials and their properties, the system achieves high Faraday efficiency even for multi-electron reduction reactions that produce desired hydrocarbons, overcoming the inherent difficulty of advancing reactions requiring multiple electrons.
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 catalyst achieves high CO2 reduction efficiency by increasing the reactive surface area and selectively advancing the reduction reaction with low energy input, improving Faraday efficiency and product selectivity.
Implementation Method 1
A reduction catalyst with a charge collector and modified organic molecules containing quaternary nitrogen cations, which are chemically bound to a metal layer, enhancing CO2 reduction efficiency by promoting selective reactions with low energy consumption.
Implementation Method 2
The catalyst achieves high CO2 reduction efficiency by increasing the reactive surface area and selectively advancing the reduction reaction with low energy input, improving Faraday efficiency and product selectivity.
Implementation Method 3
The electrode for reduction reaction gains a reduction potential of CO2 from the electrode for oxidation reaction to reduce CO2, and, thus, to produce formic acid (HCOOH).
Data Source
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AI summary
According to one embodiment, a reduction catalyst includes a charge collector having a metal layer on a surface; and a modified organic molecule bound to a surface of the metal layer and containing a quaternary nitrogen cation.