Plant-Derived Activated Carbon With Low Surface Hydrogen and Oxygen
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Solution Overview
Problem
Existing methods for producing activated carbon with high specific surface area and reduced surface functional groups and structure-terminal hydrogen atoms are inefficient, often requiring high-temperature heat treatments that decrease the specific surface area, or use fluorocarbon gases that are economically disadvantageous and pose health risks.
Innovation Solution
A production method involving attaching an alkali metal hydroxide to plant-derived activated carbon and heat-treating it in an inert gas atmosphere with a halogen compound to reduce surface functional groups and hydrogen content, maintaining a large specific surface area and low resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbonaceous materials are used for fuel cells, then fuel cell performance is limited, but using advanced materials increases manufacturing complexity and cost
Solution Approach 1:
The patent employs composite carbonaceous materials formed by carbonizing cellulose-based substances that contain both carbon and heteroatoms (nitrogen, sulfur, phosphorus). This composite structure combines the advantages of different elements to achieve superior fuel cell performance while maintaining compatibility with conventional manufacturing processes. The heteroatoms create active sites that enhance electrochemical reactions without requiring complex multi-component composites.
Solution Approach 2:
The invention changes the chemical composition parameters of carbonaceous materials by incorporating heteroatoms at specific concentrations (0.1-10 at%). This parameter modification transforms ordinary carbon materials into high-performance catalysts, improving fuel cell activity and durability through controlled compositional adjustment rather than complex structural design.
2Loss of energy
If carbonaceous materials are produced by conventional methods, then production cost is high and environmental impact is severe, but alternative methods may reduce performance
Solution Approach 1:
The patent utilizes cellulose-based substances that naturally contain carbon and heteroatoms in their molecular structure. The carbonization process simply removes volatile components, allowing the material to self-organize into the desired carbonaceous structure with active sites. This self-service approach eliminates the need for expensive catalysts or energy-intensive processing steps required by conventional methods.
Solution Approach 2:
The invention uses abundant, inexpensive cellulose-based materials (plant biomass, agricultural waste) as feedstocks instead of precious metals or complex synthetic precursors. These readily available materials undergo carbonization to produce durable carbonaceous catalysts, replacing expensive conventional materials with economical alternatives that maintain high performance.
3Reliability
If carbonaceous materials with heteroatoms are used, then fuel cell activity and durability improve, but material synthesis becomes more complex
Solution Approach 1:
The patent merges multiple beneficial elements (carbon, nitrogen, sulfur, phosphorus) into a single integrated carbonaceous material structure through the carbonization of cellulose-based precursors. This unified approach combines the functions of multiple separate catalyst components into one material, simplifying manufacturing while achieving synergistic effects that enhance both activity and durability.
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 method produces activated carbon with a specific surface area of 1000 to 1800 m²/g, low oxygen and hydrogen content, and low resistance, suitable for use in electrodes with improved electrostatic capacitance and safety.
Implementation Method 1
carbonaceous material for use in a fuel cell, wherein the carbonaceous material is formed from a substance containing carbon and heteroatoms and has a structure in which a plurality of active sites are distributed throughout an entire surface
Data Source
AI summary
The present invention relates to a carbonaceous material which is derived from a plant, having a specific surface area of 1000 to 1800 m2/g as measured by a BET method, a hydrogen element content of 0.25% by mass or less and an oxygen element content of 1.5% by mass or less.