Graphene Production via Carbon Monoxide Reduction
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Solution Overview
Problem
Current methods for producing graphene are either time-consuming and expensive for large-scale production or result in graphene with significant oxide groups and defects, affecting its electronic, optical, and mechanical properties.
Innovation Solution
A process involving the expansion of graphite intercalated with oxygen-containing groups followed by reduction with carbon monoxide to produce reduced expanded graphite with minimal oxygen content, which is then exfoliated to form high-quality reduced graphene.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bottom up methods such as CVD are used for graphene production, then high quality single-layer or few-layer graphene can be obtained, but the production is time consuming and expensive with only small volumes produced
Solution Approach 1:
The invention transitions from producing single-layer or few-layer graphene to producing multi-layer graphene arrays, effectively changing the dimensional aspect of the product. This allows scaling up production volume while maintaining quality through the stacked multi-layer structure that can be produced in larger quantities per unit area
Solution Approach 2:
The invention changes key process parameters including using expandable graphite as starting material, applying controlled expansion conditions, and optimizing reduction parameters to achieve high-quality graphene at scale. The multi-layer structure parameter enables both high volume and high quality simultaneously
2Productivity
If top down methods such as chemical oxidation are used for graphene production, then large quantities of graphene can be produced, but the graphene contains significant proportion of oxide groups and defects which have detrimental effects on electronic, optical and mechanical properties
Solution Approach 1:
The invention uses controlled oxidation during the expansion process, then converts the harmful oxide groups back into beneficial structures through reduction with carbon monoxide. This transforms the detrimental oxide-containing intermediate into high-quality reduced graphene with restored electronic, optical and mechanical properties
Solution Approach 2:
The invention introduces carbon monoxide as an intermediary reducing agent that selectively removes oxide groups from the expanded graphite structure. This intermediary substance enables the conversion of oxidized graphite into high-quality reduced graphene while maintaining production scalability
3Manufacturing precision
If expandable graphite is heated for expansion followed by reduction with carbon monoxide, then high quality reduced expanded graphite with minimal oxide content can be produced, but the process requires multiple steps and controlled conditions
Solution Approach 1:
The invention merges the expansion and reduction steps into an integrated process flow where expandable graphite is heated for expansion and then immediately treated with carbon monoxide for reduction in a coordinated sequence. This merging approach maintains simplicity while achieving minimal oxide content through the combined effects of both steps
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 process enables the production of high-quality graphene with reduced defects and oxide content, suitable for large-scale commercial viability and improved electronic, thermal, and mechanical properties.
Implementation Method 1
contacting the expanded graphite with carbon monoxide to reduce at least a portion of the oxygen containing groups thereby forming reduced expanded graphite
Implementation Method 2
heating the expandable graphite under conditions sufficient to cause expansion of the expandable graphite thereby forming expanded graphite
Data Source
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AI summary
A process for the preparation of reduced graphene comprising the steps of: providing an expandable graphite intercalated with oxygen containing groups; heating the expandable graphite under conditions sufficient to cause expansion of the expandable graphite and formation of an expanded graphite comprising oxygen containing groups; and contacting the expanded graphite with carbon monoxide to reduce at least a portion of the oxygen containing groups and form a reduced expanded graphite comprising an array of reduced graphene. The process of the invention enables large volumes of high quality graphene to be produced.