Nitride Electrode CO2 Reduction Overvoltage
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Solution Overview
Problem
Current CO2 reduction techniques, such as catalytic hydrogenation and electrolytic reduction, face challenges including high energy input and low energy efficiency due to the need for high temperatures and pressures, and catalyst durability issues in the electrolytic method.
Innovation Solution
An electrochemical cell using nitrides like titanium nitride, zirconium nitride, and tantalum nitride as catalysts to reduce CO2 at lower overvoltages, allowing for the production of useful substances like formic acid, methane, and ethylene at ordinary temperatures and pressures, with improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If catalytic hydrogenation method is used to reduce CO2, then CO2 can be converted into highly useful substances such as methanol, but high temperature and high pressure conditions are required which lead to high energy input and low energy utilization efficiency
Solution Approach 1:
The patent changes the reaction conditions from high temperature and high pressure to ordinary temperature and pressure by using electrolytic reduction instead of catalytic hydrogenation. This parameter change significantly reduces energy input while maintaining CO2 conversion capability.
Solution Approach 2:
The patent replaces the mechanical/thermal system (catalytic hydrogenation requiring high T and P) with an electrochemical system (electrolytic reduction using electric current). This substitution eliminates the need for high temperature and pressure equipment, reducing energy consumption and simplifying the system.
2Productivity
If catalytic hydrogenation method is used to reduce CO2, then CO2 can be converted into highly useful substances such as methanol, but large-scale equipment must be installed which increases device complexity
Solution Approach 1:
The patent replaces the complex high-temperature and high-pressure equipment of catalytic hydrogenation with a simple electrolytic reduction system. This substitution dramatically simplifies the device structure and eliminates the need for large-scale equipment while maintaining CO2 conversion capability.
3Use of energy by moving object
If conventional catalysts are used in electrolytic reduction method, then CO2 reduction can proceed at ordinary temperature and pressure, but the catalysts deteriorate severely with time during long-time catalytic reaction
Solution Approach 1:
The patent uses composite materials consisting of metal particles (Cu, Ag, or their alloys) supported on porous substrates (such as porous glass, porous ceramic, or porous polymer). This composite structure provides both the catalytic activity of the metal particles and the mechanical stability and durability of the porous substrate, solving the catalyst deterioration problem.
Solution Approach 2:
The patent employs porous materials as the support structure for the metal catalyst particles. The porous structure provides high surface area for catalyst dispersion, good mechanical strength for long-term stability, and facilitates mass transport of reactants and products, thereby improving catalyst durability during long-time operation.
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 enables efficient CO2 reduction with lower energy input and higher catalyst durability, producing valuable substances at reduced overvoltages and energy costs, making it a promising technique for energy-saving and environmental applications.
Implementation Method 1
a step (b) of applying a negative voltage and a positive voltage to the working electrode and the counter electrode, respectively, to reduce the carbon dioxide
Data Source
AI summary
The method for reducing carbon dioxide of the present disclosure includes a step (a) and a step (b) as follows. A step (a) of preparing an electrochemical cell. The electrochemical cell comprises a working electrode, a counter electrode and a vessel. The vessel stores an electrolytic solution. The working electrode contains at least one nitride selected from the group consisting of titanium nitride, zirconium nitride, hafnium nitride, tantalum nitride, molybdenum nitride and iron nitride. The electrolytic solution contains carbon dioxide. The working electrode and the counter electrode are in contact with the electrolytic solution. A step (b) of applying a negative voltage and a positive voltage to the working electrode and the counter electrode, respectively, to reduce the carbon dioxide.