Carbon Catalyst Copper Ratio Oxygen Reduction
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Solution Overview
Problem
Conventional carbon catalysts face challenges in achieving high catalytic activity due to excessive development of shell-like structures, which decreases oxygen reduction catalytic activity, and struggle to balance nitrogen atom content and structure development, leading to insufficient catalytic performance.
Innovation Solution
A carbon catalyst is developed by carbonizing a raw material containing nitrogen and metals like iron, cobalt, and copper, with a specific mass ratio of copper to the total iron and cobalt content between 10 to 95%, achieving a nitrogen atom-to-carbon ratio of 0.7 or more and an oxygen reduction-starting potential of 0.774V or more, thereby improving catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the shell-like structure of the carbon catalyst is excessively developed, then the structural completeness is improved, but the catalytic activity decreases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing copper in specific ratios (10-95% by mass relative to iron and cobalt) and controlling nitrogen content (0.1-5.0 wt%), which modifies the carbonization process to achieve optimal shell-like structure development without excessive growth, thereby maintaining catalytic activity while improving structural completeness
Solution Approach 2:
The patent creates a composite catalyst system combining iron, cobalt, and copper metals within the carbon matrix. This composite approach allows the different metals to work synergistically, where copper specifically suppresses excessive shell-like structure development while iron and cobalt contribute to catalytic activity, resolving the contradiction between structural completeness and catalytic performance
2Shape
If cobalt or iron is used to develop the shell-like structure, then the structural development is improved, but the nitrogen atom content decreases
Solution Approach 1:
The patent adjusts the nitrogen content parameter to a specific range (0.1-5.0 wt%) and controls the metal composition ratios during carbonization. This parameter optimization ensures that sufficient nitrogen remains in the final catalyst while still allowing adequate shell-like structure development through the use of cobalt and iron, resolving the trade-off between structural development and nitrogen retention
3Reliability
If platinum is used as the catalyst, then the catalytic activity is improved, but the cost increases and chemical stability deteriorates
Solution Approach 1:
The patent replaces expensive platinum with a cost-effective carbon-based catalyst system containing iron, cobalt, and copper. Although carbon catalysts traditionally have lower activity, the specific composition ratios and nitrogen doping in this invention enhance the durability and activity to practical levels, providing a cheaper alternative that avoids platinum's harmful side reactions with electrolytes
Solution Approach 2:
The patent modifies the chemical parameters of the catalyst by controlling metal ratios (copper 10-95% relative to iron and cobalt) and nitrogen content (0.1-5.0 wt%), which enhances the intrinsic catalytic activity of the carbon-based system to approach or reach platinum-level performance while maintaining superior chemical stability and avoiding electrolyte decomposition
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 catalyst exhibits enhanced catalytic activity with controlled structure development and nitrogen content, effectively promoting oxygen reduction reactions without relying on noble metals, making it suitable for applications like fuel cells and air cells.
Implementation Method 1
a carbon catalyst for a fuel cell, which is obtained by: adding a metal compound containing at least one of iron, cobalt, nickel, chromium, and manganese to a rawmaterial for producing non-graphitizable carbon; mixing the components; and performing a carbonization treatment by firing
Implementation Method 2
The catalyst exhibits enhanced catalytic activity with controlled structure development and nitrogen content, effectively promoting oxygen reduction reactions
Data Source
AI summary
Provided is a carbon catalyst having an improved catalytic activity, aproductionmethodtherefor, andanelectrodeandabattery which use the carbon catalyst. The carbon catalyst is obtained by carbonizing a rawmaterial including an organic substance containing a nitrogen atom and metals, and includes iron and/or cobalt, and copper as the metals. Further, the carbon catalyst has a crystallinity of 41.0% or less, which is determined by X-ray diffractometry, a nitrogen atom-to-carbon atom ratio of 0.7 or more, which is determined by X-ray photoelectronic spectrometry, and an oxygen reduction-starting potential of 0.774 V (vs. NHE) or more.