Doped Graphene Oxygen Reduction Catalyst
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Solution Overview
Problem
Increasing the heating temperature and time for preparing carbon-based crystals to enhance catalytic activity often results in decreased performance due to the formation of inactive metal compounds and metal crystals, which inhibit catalytic activity.
Innovation Solution
A carbon-based material is developed by doping graphene with metal and non-metal atoms such as nitrogen, boron, or phosphorus, where the diffraction pattern shows a low intensity ratio of inactive metal compound and metal crystal peaks to the (002) peak, indicating minimal inactive content, and is prepared by reducing graphene oxide with a metal and non-metal containing compound under controlled heating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heating temperature and heating time are increased to enhance catalytic activity, then the number of reaction active centers increases, but inactive metal compounds and metal crystals form which decrease catalytic performance
Solution Approach 1:
The patent optimizes heating temperature (700-900°C) and heating time (2-3 hours) parameters to achieve sufficient catalytic activity while preventing the formation of inactive metal compounds and metal crystals. This parameter optimization resolves the contradiction by finding the optimal processing conditions that maximize active centers without generating harmful byproducts
Solution Approach 2:
The patent employs continuous heating under inert atmosphere throughout the carbonization process, maintaining stable reaction conditions that promote continuous formation of active carbon-based catalysts while preventing oxidation and decomposition that would lead to inactive metal compound formation
2Quantity of substance
If heating time is increased to dope more iron and nitrogen in graphene sheets, then number of reaction active centers increases, but catalytic performance decreases
Solution Approach 1:
The patent optimizes heating time (2-3 hours) and temperature (700-900°C) to achieve sufficient doping of iron and nitrogen in graphene sheets while preventing the formation of inactive metal compounds. This parameter optimization ensures adequate active center formation without exceeding the threshold that would generate harmful byproducts
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
This approach results in a carbon-based material with high catalytic activity for oxygen reduction reactions, maintaining high electrical conductivity and minimizing inactive metal compound and metal crystal content, thereby improving catalytic performance.
Implementation Method 1
chemically-reducing the graphene oxide of the mixture to graphene using a reducing agent
Implementation Method 2
heating the resultant mixture at a heating temperature of 800°C for a heating time of two hours under argon atmosphere
Implementation Method 3
a diffraction pattern obtained by X-ray diffraction measurement of the carbon-based material by use of CuKα radiation
Data Source
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AI summary
The present invention provides a carbon-based material with high catalytic activity. The carbon-based material in accordance with the present invention includes graphene doped with metal atoms and at least one type of non-metal atoms selected from a group consisting of nitrogen atoms, boron atoms, sulfur atoms, and phosphorus atoms. A diffraction pattern obtained by X-ray diffraction measurement of the carbon-based material by use of CuK± radiation shows that a proportion of the highest of intensities of peaks derived from an inactive metal compound and a metal crystal to an intensity of a (002) peak is 0.1 or less.