GaN Anode CO2 Reduction via Condensed Light
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Solution Overview
Problem
Existing methods for reducing carbon dioxide using light energy are inefficient in increasing the production amount of reduction products due to suboptimal light intensity and energy distribution on the anode electrode.
Innovation Solution
A carbon dioxide reduction device comprising a cathode and anode container, a solid electrolyte membrane, and a condenser that focuses light with a wavelength of not more than 360 nanometers onto the anode electrode, enhancing light intensity per unit area and promoting carbon dioxide reduction on the cathode electrode without an external power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If light is irradiated onto the anode electrode without condensation, then the device structure is simple, but the light intensity per unit area is insufficient and carbon dioxide reduction efficiency is low
Solution Approach 1:
The patent introduces a condenser component that focuses light onto the anode electrode from a different spatial dimension, transforming diffuse light illumination into concentrated beam illumination. This dimensional change in light delivery enables higher light intensity per unit area without significantly increasing overall device complexity.
Solution Approach 2:
The condenser concentrates light energy onto a specific local region of the anode electrode, creating a high-intensity illumination zone exactly where it is needed for carbon dioxide reduction. This local concentration of energy improves productivity at the critical reaction site without requiring the entire device to be complex.
2Productivity
If light with wavelength greater than 360 nanometers is used, then the light source is more accessible, but the energy distribution on the anode electrode is suboptimal for reducing carbon dioxide
Solution Approach 1:
The patent specifies using light with a wavelength of not more than 360 nanometers, which changes the optical parameter to match the absorption characteristics of the nitride semiconductor layer. This parameter optimization ensures that the light energy is effectively absorbed and converted to drive carbon dioxide reduction, improving productivity despite the more specialized light source requirement.
3Productivity
If external power supply is used to drive carbon dioxide reduction, then the reduction reaction can proceed, but the device complexity and energy consumption increase
Solution Approach 1:
The patent replaces the conventional electrochemical approach requiring external power supply with a photochemical approach using light irradiation. The light energy directly excites the nitride semiconductor layer to generate electron-hole pairs that drive the carbon dioxide reduction reaction, eliminating the need for external electrical power and reducing energy consumption.
Solution Approach 2:
The nitride semiconductor layer on the anode electrode serves dual functions: it acts as both the photoactive material that absorbs light energy and the electrode that facilitates the reduction reaction. This self-service capability allows the system to perform carbon dioxide reduction using only light energy without requiring external power supplies or complex energy conversion systems.
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 method significantly increases the production amount of reduction products such as carbon monoxide and formic acid by concentrating light energy on the anode electrode, improving the overall carbon dioxide reduction efficiency.
Implementation Method 1
irradiating the anode electrode with light condensed through the condenser and having a wavelength of not more than 360 nanometers
Implementation Method 2
irradiating the anode electrode with light to generate carriers (i.e., electrons and holes) on the anode electrode
Implementation Method 3
the electrons generated on the anode electrode migrate to the cathode electrode through a conducting wire
Implementation Method 4
carbon dioxide contained in the electrolyte on the cathode electrode is reduced with the electrons which have migrated from the anode electrode
Data Source
AI summary
In a carbon dioxide reduction method according to the present disclose, used is a carbon dioxide reduction device comprising a cathode container in which a first electrolyte containing carbon dioxide is stored, an anode container in which a second electrolyte is stored, a solid electrolyte membrane, a condenser, a cathode electrode having a metal or a metal compound on the surface thereof, and anode electrode having a region formed of a nitride semiconductor layer in which a GaN layer and an AlxGa1-xN layer are stacked. The anode electrode is irradiated with light condensed by the condenser and having a wavelength of not more than 360 nanometers to reduce the carbon dioxide contained in the first electrolyte on the cathode electrode.