Platinum Electrode Ionic Liquid Alkane Oxidation
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Solution Overview
Problem
The direct electrochemical oxidation of methane at room temperature is challenging due to slow electrode kinetics, and existing systems struggle to replicate the efficiency of nature's enzymatic oxidation using electrochemistry.
Innovation Solution
The use of alkyl substituted methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid electrolytes at an interface with a platinum electrode, facilitating alkane adsorption and oxidation through a loosely-packed double layer, allowing for efficient alkane oxidation at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If direct electrochemical oxidation of methane is performed at room temperature using conventional electrode systems, then the reaction can proceed, but the electrode kinetics are extremely slow
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolyte system by introducing ionic liquids with specific properties (low viscosity, high conductivity, wide electrochemical window) to enable fast electrode kinetics at room temperature. This parameter change allows the oxidation reaction to proceed rapidly without requiring elevated temperatures.
Solution Approach 2:
The patent uses ionic liquids as intermediary substances between the electrode and methane. The ionic liquids facilitate charge transfer and reactant transport at the electrode interface, acting as a mediator that enables efficient electrochemical oxidation of methane at room temperature without direct contact between electrode and gas phase.
2Productivity
If electrochemical systems are designed to replicate enzymatic oxidation of methane, then the reaction efficiency can be improved, but the device complexity increases
Solution Approach 1:
The patent achieves high oxidation efficiency by optimizing electrolyte parameters (ionic liquid composition, concentration, temperature) and electrode parameters (potential, surface area, catalyst composition). These parameter optimizations enable the system to replicate enzymatic efficiency without requiring complex structural designs.
Solution Approach 2:
The patent replaces complex mechanical or structural systems with electrochemical parameter control. Instead of using complex mechanical structures to achieve efficient methane oxidation, the system uses controlled electrochemical parameters (potential, ionic liquid composition) to achieve the same efficiency, simplifying the overall device design.
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 method enables efficient alkane oxidation at room temperature, suitable for various applications including energy storage, fuel cells, and methane sensors, with improved kinetics and selectivity for methane oxidation.
Implementation Method 1
The use of alkyl substituted methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid electrolytes at an interface with a platinum electrode, facilitating alkane adsorption and oxidation through a loosely-packed double layer
Implementation Method 2
The direct oxidation of methane at low temperatures (e.g., from about 60° C. to about 150° C.) has been demonstrated with electrode systems utilizing acid electrolytes or polyelectrolytes
Data Source
AI summary
An aerobic method for oxidizing an alkane is disclosed herein. At least a portion of a surface of a platinum working electrode is activated at an interface between the platinum working electrode and an ionic liquid electrolyte (i.e., 1-ethyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-propyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-pentyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-hexyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-heptyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-octyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, 1-nonyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide, and 1-decyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imidem, and combinations thereof). An interface complex is formed at the interface. An alkane gas is supplied to the interface. The alkane adsorbs at or near the interface complex. The alkane gas in the presence of oxygen is supplied to the interface. While the alkane gas in the presence of oxygen is supplied to the interface, a positive electrode potential is applied to the platinum working electrode, which causes a reactive oxygen species formed at the interface to catalyze oxidation of the adsorbed alkane to form a reaction product.