g-C3N4-MoO3-MgAl2O4 Nanocomposite for High-Yield Supercapacitor Electrodes
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Solution Overview
Problem
Existing methods for manufacturing carbon nanomaterials, particularly graphitic carbon nitride (g-C3N4) and metal oxide composites, suffer from low yield, high cost, and inefficiency, limiting their application in energy storage devices like supercapacitors.
Innovation Solution
A method involving the combination of magnesium, aluminum, and molybdate salts with a carbon source in stoichiometric proportions, followed by heating and grinding steps to produce a nanocomposite of g-C3N4, MoO3, and MgAl2O4, with controlled pore distribution and specific surface area, enhancing electrical conductivity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to manufacture g-C3N4 and metal oxide composites, then the materials can be produced, but the yield is low and production cost is high
Solution Approach 1:
The patent combines multiple synthesis steps into a single one-pot solvothermal process. Magnesium salt, aluminum salt, molybdate salt, and carbon source are mixed together in one container and subjected to solvothermal treatment simultaneously, forming the nanocomposite in a single operation rather than through separate sequential steps. This merging of operations increases productivity and reduces production cost by eliminating intermediate processing steps.
Solution Approach 2:
The patent synthesizes a composite nanomaterial comprising g-C3N4, MoO3, and MgAl2O4 in a single process. The composite structure integrates multiple functional components (carbon nitride for photocatalysis, molybdenum oxide for conductivity, magnesium aluminate for stability) that work synergistically to enhance supercapacitor performance while improving manufacturing efficiency.
2Productivity
If conventional methods are used to manufacture g-C3N4 and metal oxide composites, then the materials can be produced, but the manufacturing efficiency is low
Solution Approach 1:
The patent performs preliminary mixing of all precursor salts and carbon source in appropriate stoichiometric ratios before the solvothermal treatment. This preliminary preparation ensures that all components are properly distributed and ready for simultaneous reaction, eliminating the need for time-consuming sequential addition steps during the main synthesis process and thereby improving manufacturing efficiency.
Solution Approach 2:
The solvothermal process maintains continuous reaction conditions throughout the synthesis. The heated solvent continuously facilitates the formation and transformation of the nanocomposite structure without interruption, ensuring that the useful chemical reactions proceed continuously to completion rather than through intermittent batch steps, thus reducing total processing time and improving efficiency.
3Quantity of substance
If the nanocomposite is used in supercapacitors, then charge storage capability is enhanced, but the specific surface area and pore structure must be precisely controlled
Solution Approach 1:
The patent controls the specific surface area and pore structure by adjusting key parameters of the solvothermal process, including reaction temperature, reaction time, solvent type and amount, and precursor concentrations. By systematically varying these parameters, the manufacturing process achieves precise control over the nanocomposite's surface area and porosity, optimizing charge storage capability while maintaining manufacturing precision.
Solution Approach 2:
The nanocomposite exhibits local quality variations in its structure, with different regions having optimized properties for specific functions. The g-C3N4 provides photocatalytic active sites, MoO3 provides conductive pathways, and MgAl2O4 provides structural stability with controlled porosity. This spatial distribution of different material properties within the composite enables enhanced charge storage while maintaining precise control over overall surface area and pore structure.
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 nanocomposite exhibits improved electrical conductivity, chemical stability, and specific surface area, leading to enhanced charge storage and discharge capabilities in supercapacitors, with high efficiency and reduced production costs.
Implementation Method 1
heating the first mixture to remove at least 99.5 percent by weight (wt. %) of the aqueous solvent
Implementation Method 2
calcining the first powder at a temperature in a range of from 600 degrees Celsius (° C.) to 800° C. for a time in a range of 2 to 4 hours (h)
Implementation Method 3
heating the second powder at a temperature in a range of from 550° C. to 650° C. for a time in a range of 15 minutes (min) to 1.5 h to obtain the nanocomposite, including graphitic graphitic carbon nitride (g-C3N4)
Data Source
AI summary
A method of manufacturing a nanocomposite is described. The method includes combining a magnesium salt, an aluminum salt, and a molybdate salt in stoichiometric proportions within 5 mole percent (mol. %) in an aqueous solvent including a carbon source, to obtain a first mixture. The method further includes heating the first mixture to remove at least 99.5 percent by weight (wt. %) of the aqueous solvent to obtain a first solid, grinding the first solid into a first powder, calcining the first powder at a temperature of about 600° C. to 800° C. for a time of about 2 to 4 hours (h) to obtain a second solid, grinding the second solid and urea, into a second powder, heating the second powder at a temperature of about 550° C. to 650° C. for a time of about 15 minutes (min) to 1.5 h to obtain the nanocomposite.