Electrochemical Cell With Transition-Metal Oxide CO2 Adsorbent
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Solution Overview
Problem
Existing electrochemical cells using organic materials as CO2 adsorbents face durability issues due to elution, while those using carbon materials require high oxidation-reduction potentials, leading to increased energy consumption and potential side reactions.
Innovation Solution
Employing a transition metal oxide represented by MxOy (where M is a transition metal, x is 1≤x≤3, and y is 1≤y≤5, excluding x=1 and y=2) as the CO2 adsorbent, which reduces the potential width for CO2 adsorption and desorption, thereby minimizing energy consumption and preventing side reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic materials are used as CO2 adsorbents, then CO2 adsorption capability is achieved, but durability deteriorates due to elution
Solution Approach 1:
The patent changes the material parameter from organic materials to transition metal oxide (MxOy) with specific stoichiometric ratios, fundamentally altering the chemical stability and resistance to elution while maintaining CO2 adsorption capability through electrochemical reactions
Solution Approach 2:
The patent employs composite material structure by combining transition metal oxide with specific electrode materials and electrolytes, creating a stable system that prevents elution while enabling efficient CO2 adsorption and desorption cycles
2Stability of the object's composition
If carbon materials are used as CO2 adsorbents, then structural stability is improved, but energy consumption increases due to high oxidation-reduction potentials
Solution Approach 1:
The patent optimizes the oxidation-reduction potential parameter by selecting transition metal oxide with specific MxOy ratios, lowering the potential width required for CO2 adsorption and desorption compared to traditional carbon materials, thereby reducing energy consumption
Solution Approach 2:
The patent implements periodic voltage application to enable reversible adsorption and desorption of CO2 at lower potentials, allowing the system to cycle between states with minimal energy input compared to continuous high-potential operation required by carbon materials
3Productivity
If high oxidation-reduction potentials are applied to carbon materials, then CO2 desorption is achieved, but side reactions increase
Solution Approach 1:
The patent changes the electrochemical potential parameter by using transition metal oxide adsorbents that operate at lower potentials, effectively suppressing side reactions such as oxygen evolution while maintaining high CO2 desorption efficiency through optimized redox chemistry
Solution Approach 2:
The patent converts the potential harm of high-energy side reactions into benefit by selecting materials where the lower potential operation naturally suppresses unwanted reactions, turning the limitation into an advantage for selective CO2 recovery
Data Source
AI summary
An electrochemical cell includes a working electrode and a counter electrode, and the working electrode includes a CO2 adsorbent. The electrochemical cell is configured such that, when a voltage is applied between the working electrode and the counter electrode, electrons are supplied from the counter electrode to the working electrode, and the CO2 adsorbent bonds with CO2 contained in a CO containing gas in association with the electrons being supplied to the working electrode. The CO2 adsorbent contains a transition metal oxide represented by a general formula MxOy, where M is a transition metal, x is within a range of 1≤x≤3, and y is within a range of 1≤y≤5, excluding a combination of x=1 and y=2.