Lanthanide Electrochemistry Using Ion-Conducting Electrode Films
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Solution Overview
Problem
Current electrochemical methods for lanthanides and actinides are cumbersome, costly, and time-consuming due to their unique properties, which limit their detection, separation, and utilization in processes like the oxygen reduction reaction, especially in common solvents.
Innovation Solution
Electrochemical oxidation and reduction of lanthanides and actinides in organic solvent systems with a dielectric constant of at least three and less than 25 wt% water, using electronically conductive electrodes with ionically conducting or permeable films and ligands that facilitate the reactions, potentially enhanced by magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common liquid electrochemical solvents (aqueous and organic) are used, then the electrochemical process is simpler and less costly, but the potential window is limited by solvent electrolysis which prevents lanthanide analysis
Solution Approach 1:
An ionically conducting film is introduced as an intermediary layer on the electrode surface. This film mediates between the common liquid solvent system and the lanthanide species, enabling electrochemical reactions that would otherwise be impossible due to solvent electrolysis limitations. The film allows selective ion transport while blocking solvent decomposition.
Solution Approach 2:
The invention changes the interfacial parameters by modifying the electrode surface with an ionically conducting film. This alters the electrochemical window and reaction conditions at the electrode-solution interface, enabling access to potentials outside the normal solvent stability range while maintaining the benefits of using common solvents.
2Reliability
If mercury drop electrodes or chemically modified carbon paste electrodes are used, then lanthanide electrochemistry can be performed, but the device complexity and cost increase
Solution Approach 1:
The invention replaces expensive, complex, and often disposable electrodes like mercury drop electrodes with a reusable electrode system coated with an ionically conducting film. The film can be applied as a thin layer that is cost-effective and allows the electrode to be reused multiple times, reducing both material cost and device complexity.
Solution Approach 2:
Instead of changing the bulk electrode material to mercury or chemically modifying carbon paste, the invention changes the surface properties by depositing an ionically conducting film. This parameter change at the surface level achieves the desired electrochemical performance with simpler, less costly electrode substrates.
3Reliability
If molten salts and ionic liquids are used as solvent systems, then lanthanide electrochemistry can be performed, but the system becomes less tractable and more costly
Solution Approach 1:
The ionically conducting film acts as an intermediary that enables the use of tractable common liquid solvents instead of requiring molten salts or ionic liquids. The film creates a microenvironment at the electrode surface that supports lanthanide electrochemistry while the bulk solvent remains a simple, easy-to-handle liquid.
Solution Approach 2:
The invention changes the operational parameters by enabling electrochemical reactions at potentials and conditions that would normally require molten salts or ionic liquids, but achieves this in common liquid solvents through the ionically conducting film modification. This maintains ease of operation while achieving the desired electrochemical performance.
4Reliability
If sequential extractions are used for lanthanide separations, then separations can be achieved, but the process becomes tedious and time-consuming
Solution Approach 1:
The invention replaces the mechanical/chemical process of sequential extractions with an electrochemical method. By applying electrochemical potentials to the lanthanide mixture in the presence of the ionically conducting film, separations are achieved through electrochemical reactions and potential deposition, eliminating the need for multiple sequential extraction steps.
Solution Approach 2:
The invention changes the separation mechanism from chemical extraction based on solubility differences to electrochemical separation based on redox potentials and ion transport through the film. This parameter change enables faster, more efficient separations by exploiting electrochemical properties rather than requiring numerous sequential chemical extraction 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
Facilitates facile electrochemical processes, enables separation and identification of lanthanides and actinides, and improves oxygen reduction reactions in devices like metal air batteries and fuel cells, allowing for more efficient and cost-effective operations.
Implementation Method 1
the at least one working electrode comprises at least one electronically conductive electrode substrate and at least one ionically conducting or ionically permeable film disposed on the substrate
Implementation Method 2
electrochemically oxidizing and/or reducing at least one lanthanide, at least one actinide, or a combination thereof, irrespective of oxidation state
Implementation Method 3
wherein the ligand is chemically similar to a structure in the ionically conducting or ionically permeable film
Data Source
AI summary
Electrochemically reacting a lanthanide or actinide in solvent at a working electrode; wherein the solvent comprises an organic solvent such as acetonitrile which have a dielectric constant of at least three; wherein the solvent system further comprises an electrolyte; wherein the working electrode comprises an ionically conducting or permeable film such as a fluorosulfonate film; wherein at least one ligand such as triflate distinct from the ionically conducting or permeable film is present; wherein the ligand is chemically similar to a structure in the ionically conducting or ionically permeable film; and optionally wherein the electrochemical oxidation or reduction is carried out under the influence of a magnetic field which favorably enhances the reaction. Improved electrochemical methods, identification, and separation can be achieved. Also, an electrochemical device, wherein the device is adapted to employ the oxygen reduction reaction (ORR) at the cathode, wherein the cathode is magnetically modified, or the electrolyte comprises at least one lanthanide or actinide, or both.