Date Seed Mesoporous Carbon Electrodes Without Chemical Activation
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Solution Overview
Problem
Existing supercapacitor materials, particularly for all-solid-state applications, lack effectiveness and sustainability, with chemical activation methods being costly and environmentally harmful, and there is a need for improved electrode materials from renewable sources.
Innovation Solution
The development of a physically activated carbon electrode using date seed mesoporous carbon with a high surface area and specific pore structure, combined with a conductive carbon and binding compound, is used in an all-solid-state supercapacitor design, eliminating the need for chemical activation agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If chemical activation method is used to produce activated carbon, then the electrode material can be obtained, but the cost increases and environmental harm occurs
Solution Approach 1:
The patent replaces chemical activation methods with physical activation using steam and CO2 gases. This substitution eliminates the need for costly and environmentally harmful chemical agents like KOH and H3PO4, while still achieving effective pore formation and surface area development in the activated carbon electrode material
Solution Approach 2:
The patent changes the activation parameters from chemical to physical methods, specifically using steam at 700-900°C and CO2 at 800-1000°C. This parameter change maintains the activation effectiveness while removing the harmful chemical substances and associated costs
2Object-affected harmful factors
If physically activated carbon is used, then environmental friendliness and cost-effectiveness improve, but the surface area and pore structure may be insufficient
Solution Approach 1:
The patent employs physical activation with steam and CO2 to create a well-developed porous structure in the activated carbon. The controlled physical activation process generates optimal pore size distribution and surface area (600-800 m²/g) necessary for high capacitance while maintaining environmental friendliness
Solution Approach 2:
The patent creates a composite electrode structure combining physically activated carbon with conductive additives (acetylene black, carbon nanotubes, or graphene) and binders. This composite approach enhances the surface area and electrical conductivity while maintaining the environmental benefits of physical activation
3Reliability
If date seed mesoporous carbon is used as precursor, then renewable source and sustainability are achieved, but the initial conductivity may be low
Solution Approach 1:
The patent combines date seed mesoporous carbon with conductive additives such as acetylene black, carbon nanotubes, or graphene in specific ratios (70-80 wt% activated carbon, 10-20 wt% conductive additive). This composite formulation maintains the sustainability of using renewable date seeds while significantly enhancing the electrical conductivity for supercapacitor application
Solution Approach 2:
The physical activation process creates a mesoporous structure in the date seed-derived carbon that facilitates both ion transport and electrical conductivity. The controlled pore development during physical activation enhances the overall electrochemical performance while maintaining the renewable nature of the precursor
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 electrode achieves high specific capacitance and power density, making it suitable for energy storage applications, particularly in wearable devices and power banks, while being environmentally friendly.
Implementation Method 1
EDLCs store electrolyte ions/charges on the surfaces of the used electrode materials due to the electrostatic attraction among the adsorbed electrolyte ions and polarized electrode surfaces, resulting in two charged layers called Helmholtz double layers
Implementation Method 2
The mechanism of this approach involves the occurrence of redox reactions among the carbon component of carbon materials and various oxidizing gases, including CO2(g), O2(g), H2O(g), and their mixtures
Implementation Method 3
The design of the hierarchical porous materials creates larger effective specific surface areas, which attains fast ion transportation
Data Source
AI summary
An electrode including a substrate, a binding compound, date seed mesoporous carbon, and a conductive carbon (CC) other than the date seed mesoporous carbon. The date seed mesoporous carbon has a surface area of 600-800 m2/g, an average pore size of 1-5 nm, and a sheet morphology. A mixture of the binding compound, the date seed mesoporous carbon, and the conductive carbon other than the date seed mesoporous carbon is coated on the surface of the substrate.