Electrochemical Apparatus for Hydrogen Generation and Carbon Dioxide Sequestration
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Solution Overview
Problem
Current methods for removing carbon dioxide from the atmosphere or gas streams are inefficient, costly, and often produce toxic by-products, while the production of renewable hydrogen is hindered by the need for large energy inputs and inefficient processes.
Innovation Solution
An electrochemical apparatus that uses water electrolysis to generate hydrogen and sequester carbon dioxide, comprising a water electrolysis chamber, gas contact assembly, and separation chamber, which concentrates hydroxide ions to react with carbon dioxide, forming bicarbonate or carbonate ions, and separates them for further processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If current methods are used to remove carbon dioxide from the atmosphere or gas streams, then carbon dioxide can be captured, but the process is inefficient and costly
Solution Approach 1:
The patent changes the chemical parameters of the electrolyte solution to achieve selective ion transport. By using specific ion-exchange membranes and controlling pH gradients, the system efficiently concentrates carbon dioxide-reactive ions while minimizing energy consumption compared to conventional thermal separation methods
Solution Approach 2:
The patent replaces mechanical/thermal separation systems with an electrochemical system. Instead of using high-energy thermal processes or mechanical compression to separate and concentrate carbon dioxide, the invention uses electrical energy to drive ion transport through electrolysis and electrodialysis, achieving more efficient separation with lower overall energy input
2Productivity
If conventional carbon dioxide sequestration methods are used, then carbon dioxide can be removed, but toxic by-products such as chlorine are produced
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the electrochemical cell. Different compartments contain specific electrolytes and membranes tailored for their function: one zone generates hydroxide ions for carbon dioxide absorption, another zone handles carbon dioxide concentration, and a third zone manages by-product separation. This localized functional differentiation enables efficient carbon dioxide removal while preventing toxic by-products from forming or being released
Solution Approach 2:
The patent converts potentially harmful electrochemical reactions into beneficial processes. Instead of allowing chlorine production from chloride electrolysis, the system uses oxygen-evolving anodes and controls electrolyte composition to prevent chlorine formation. The hydroxide ions that could cause corrosion are instead utilized to capture carbon dioxide, transforming a potential hazard into the primary capture mechanism
3Productivity
If water electrolysis is used to produce renewable hydrogen, then hydrogen can be generated, but large energy inputs are required
Solution Approach 1:
The patent merges hydrogen production with carbon dioxide capture into a single integrated electrochemical system. The water electrolysis chamber and carbon dioxide capture chambers are coupled, allowing the system to simultaneously produce hydrogen while using the generated hydroxide ions for carbon dioxide sequestration. This integration eliminates the need for separate energy-intensive processes and enables the system to operate more efficiently by utilizing the chemical products of one reaction for another useful purpose
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 apparatus efficiently captures carbon dioxide and generates renewable hydrogen, reducing atmospheric carbon dioxide levels while avoiding toxic by-products, and can operate using renewable energy sources, resulting in a carbon-negative energy strategy.
Implementation Method 1
a water electrolysis chamber, adapted to electrolyze water and to be electrically connected to an electrical energy source
Implementation Method 2
react the carbon dioxide with the hydroxide ions to form bicarbonate or carbonate ions in solution
Data Source
AI summary
A carbon dioxide negative method of manufacturing renewable hydrogen and trapping carbon dioxide from the air or gas streams is described. Direct current renewable electricity is provided to a water electrolysis apparatus with sufficient voltage to generate hydrogen and hydroxide ions at the cathode, and protons and oxygen at the anode. These products are separated and sequestered and the base is used to trap carbon dioxide from the air or gas streams as bicarbonate or carbonate salts. These carbonate salts, hydrogen, and trapped carbon dioxide in turn can be combined in a variety of chemical and electrochemical processes to create valuable carbon-based materials made from atmospheric carbon dioxide. The net effect of all processes is the generation of renewable hydrogen from water and a reduction of carbon dioxide in the atmosphere or in gas destined to enter the atmosphere.