Graphite Electrode Composition for High CO2 Concentration
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Solution Overview
Problem
Conventional carbon dioxide generators with graphite electrodes fail to produce sufficient carbon dioxide concentration, which is necessary to effectively attract mosquitoes and insects, as they typically produce carbon dioxide at concentrations below 2 v % during electrolysis.
Innovation Solution
A graphite electrode composition comprising 50%-90% graphite powder, 10%-40% adhesive, 1%-30% first additive, and 0.1%-10% second additive, along with hexamethylenetetramine, is used in a manufacturing process involving mixing and heat pressing to increase carbon dioxide concentration in electrolytic gas to up to 10 v %, with a carbon dioxide generator design that includes a box body, partition plate, and cathode plate for efficient electrolysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional graphite electrode is used for electrolysis, then the electrode structure is simple and easy to manufacture, but the carbon dioxide concentration in electrolytic gas is insufficient (below 2 v %)
Solution Approach 1:
The patent applies composite materials by formulating a graphite electrode composed of multiple ingredients including graphite powder (50-90%), adhesive (10-40%), first additive (1-30%), and second additive (0.1-10%). This composite structure enables the electrode to produce carbon dioxide at concentrations of 10 v % or more during electrolysis, resolving the contradiction between simple electrode structure and high carbon dioxide output.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition parameters of the graphite electrode. Specifically, it adjusts the proportions of graphite powder, adhesive, and additives, and introduces hexamethylenetetramine as a key component. These parameter modifications transform the electrode's electrolysis performance, enabling it to generate sufficient carbon dioxide concentration (≥10 v %) while maintaining manufacturability.
2Quantity of substance
If graphite powder content is increased to improve carbon dioxide production, then carbon dioxide concentration increases, but electrode strength and structural stability may decrease
Solution Approach 1:
The patent resolves this contradiction through composite material design by combining graphite powder with adhesive and additives in specific proportions. The adhesive (10-40%) and additives (first additive 1-30%, second additive 0.1-10%) form a matrix that binds graphite particles, maintaining electrode structural integrity even when graphite powder content is high (50-90%). This composite structure enables both high carbon dioxide production and sufficient electrode strength.
Solution Approach 2:
The patent applies local quality by differentiating the functions of various components within the electrode. Graphite powder (50-90%) provides the primary electrolysis function for carbon dioxide generation, while adhesive (10-40%) provides structural binding, and additives (first additive 1-30%, second additive 0.1-10%) provide auxiliary functions. The hexamethylenetetramine (5-15% of adhesive) specifically enhances carbon dioxide production. This functional differentiation allows each component to optimize its local role, achieving both high carbon dioxide concentration and electrode strength.
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 solution significantly increases carbon dioxide concentration in electrolytic gas to 10 v % or more, making it suitable for mosquito-killing and plant growth applications, while being energy-efficient and environmentally friendly.
Implementation Method 1
graphite is used as electrode for producing carbon dioxide during electrolysis
Implementation Method 2
heat pressing and curing the mixture in a mold under 100-300 degrees Celsius and 10-60 MPa
Data Source
AI summary
The present invention relates to a graphite electrode and manufacturing process thereof, and a carbon dioxide generator, wherein the graphite electrode comprises the following in weight percentage: graphite powder 50%-90%; adhesive 10%-40%; first additive 1%-30%; second additive 0.1%-10%; wherein the adhesive comprises at least one of phenolic resin, bisphenol A epoxy resin and urea formaldehyde resin; the first additive is selected from at least one of the following: polylactic acid, carbonate, monosaccharide, oligosaccharide and polymethacrylates; the second additive is selected from at least one of the following: carbon black, carbon nanotubes, silicon carbide, boron nitride, silicon oxide, aluminium oxide, zinc oxide, iron oxide, titanium dioxide, calcium carbonate, stearic acid, zinc stearate and calcium stearate. The carbon dioxide concentration of the gas obtained by the electrolysis of the present invention reaches 10 v % or more, and the gas produced is stable in quantity.