Chloride-Free Electrochemically Active Coating for Low-Resistance Electrodes
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Solution Overview
Problem
Existing electrochemically active coatings for electrodes trap anionic portions of metal salts, increasing resistance and decreasing efficiency due to chlorine content, which affects the performance of electrodes in electrochemical applications.
Innovation Solution
A method involving the reaction of platinum group metal salts in polar organic solvents to form complexes, followed by heating and acid removal, results in a coating composition that is essentially free of chlorine, using a mixture of iridium and tantalum oxides on a conductive substrate, which reduces resistance and enhances efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal salt solutions are applied to electrodes and heated to form metal oxide coatings, then the electrode surface is coated with electrochemically active material, but the anionic portion of the metal salt becomes trapped in the coating, increasing resistance and decreasing efficiency
Solution Approach 1:
The patent removes the harmful anionic portion (chloride) from the coating formation process by using organometallic precursors that decompose to leave only metal oxide without trapping chloride ions. This extraction of the harmful component resolves the contradiction by eliminating the source of high resistance while maintaining coating formation.
Solution Approach 2:
The patent changes the chemical parameters of the coating process by substituting traditional metal salt solutions with organometallic compounds in organic solvents. This parameter change alters the decomposition behavior during heating, preventing chloride trapping and reducing coating resistance while maintaining electrochemical activity.
2Ease of manufacture
If chlorine-containing metal salts are used to form coatings, then the coating can be formed on the electrode, but the chlorine increases resistance and decreases the efficiency of the coated electrode
Solution Approach 1:
The patent changes the chemical composition parameters by replacing chlorine-containing metal salts with organometallic compounds. This substitution maintains the ability to form coatings through thermal decomposition while eliminating the harmful chlorine that reduces efficiency, thus resolving the contradiction between ease of manufacture and electrode efficiency.
Solution Approach 2:
The patent converts the potentially harmful thermal decomposition process into a beneficial one by selecting organometallic precursors that decompose cleanly without releasing trapped chloride ions. The decomposition process that could have been harmful is transformed into a clean coating formation method that improves electrode efficiency.
3Reliability
If conventional metal salt coatings are applied to electrodes, then the coating provides electrochemical activity, but the trapped anionic portions require expensive stabilizers and cause contamination
Solution Approach 1:
The patent extracts and eliminates the contaminating anionic portions from the coating process by using organometallic precursors that leave only metal oxide upon decomposition. This removal of contaminating substances resolves the contradiction by maintaining electrochemical activity while eliminating contamination that would otherwise require expensive stabilizers.
Solution Approach 2:
The patent transforms the coating process from a contaminating operation to a clean process by selecting precursors that decompose without leaving harmful residues. The decomposition that could have caused contamination is converted into a clean source of electrochemically active metal oxide, eliminating the need for stabilizers and reducing contamination.
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 resulting electrochemically active coatings exhibit reduced resistance and improved efficiency, leading to a decrease in cell voltage by 10-20% and improved purity of metal values during electrowinning processes, eliminating the need for expensive stabilizers and reducing contamination.
Implementation Method 1
reacting a platinum group metal salt in a polar organic solvent to yield a mixture, then heating the mixture to create a platinum group metal-polar organic solvent complex and an acid
Implementation Method 2
oxidizing the iridium into an amorphous phase, a crystalline phase, or combinations thereof
Implementation Method 3
heating the conductive substrate coated with the mixture
Data Source
AI summary
Accordingly, in various embodiments, the present invention provides methods for making electrochemically active materials. Methods include making an electrochemically active material by reacting a platinum group metal salt in a organic solvent to yield a mixture, then heating the mixture to create a metal-organic solvent complex and an acid, followed by removing at least a portion of the acid, and yielding an electrochemically active material comprising the metal-organic solvent complex. In an exemplary embodiment, the resulting electrochemically active material may be used for coating an electrode.