Cu Monoatomic Layer Deposition on Pt via Formic Acid Oxidation
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Solution Overview
Problem
Existing methods for depositing a Cu monoatomic layer on Pt particles require an external power source, are costly, and not well-suited for mass production due to the need for precise potential control and risk of Cu layer detachment from Pt nanoparticles during oxygen generation.
Innovation Solution
A method involving a Cu electrode immersed in a Cu ion-containing acidic aqueous solution at equilibrium, allowing the core particle to be coated with a Cu monoatomic layer without an external power source, where the Cu electrode functions as both a power source and counter-electrode, preventing oxygen generation and facilitating mass production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an external power source is used to deposit Cu layer on Pt particles, then the Cu layer can be deposited with controlled potential, but the process complexity and cost increase
Solution Approach 1:
The Pt particle itself serves as the power source for Cu deposition through its catalytic activity. The Pt catalyst facilitates the oxidation of formic acid to generate electrons in situ, which then reduce Cu ions to deposit Cu atoms on the Pt surface. This eliminates the need for external power sources while maintaining controlled Cu layer formation.
Solution Approach 2:
Formic acid acts as an intermediary substance that mediates the energy transfer from chemical to electrical form. It undergoes oxidation on the Pt surface to generate electrons, which serve as the reducing agent for Cu deposition. This intermediary enables the self-powered process by converting chemical energy into the electrical energy needed for Cu layer formation.
2Manufacturing precision
If precise potential control is implemented during Cu deposition, then deposition quality improves, but the manufacturing time and process complexity increase
Solution Approach 1:
The method controls Cu deposition by adjusting chemical parameters rather than electrical parameters. By controlling the concentration of formic acid and Cu ions, along with reaction temperature and pH, the process achieves precise Cu layer deposition without requiring complex potential control systems, thereby reducing process time and complexity.
3Productivity
If Cu layer is deposited on Pt nanoparticles in presence of oxygen, then the catalytic process can proceed, but Cu layer detachment occurs
Solution Approach 1:
The Cu layer is deposited on the Pt particle surface before the catalytic reaction begins. This preliminary Cu coating creates a stable protective layer that prevents Pt oxidation during subsequent catalytic operations in the presence of oxygen, thereby maintaining both catalytic activity and structural stability.
Solution Approach 2:
The Cu layer serves as a protective cushion deposited beforehand on the Pt surface. This Cu barrier prevents direct contact between oxygen and the Pt surface during catalysis, preventing Pt oxidation and Cu layer detachment, thus cushioning against potential damage during the catalytic process.
4Manufacturing precision
If conventional Cu deposition methods are used, then Cu layer can be formed, but the process is not suitable for mass production
Solution Approach 1:
Each Pt particle serves as its own power source for Cu deposition through catalytic oxidation of formic acid. This decentralized, self-powered approach allows simultaneous deposition on numerous particles without requiring complex external power distribution systems, making the process highly suitable for mass production while maintaining precise Cu layer formation.
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
Enables rapid and efficient deposition of a Cu monoatomic layer on Pt particles without external power, reducing process costs and enhancing scalability, while minimizing the risk of Cu layer detachment.
Implementation Method 1
a deposition step of depositing a Cu layer on a surface of a core particle formed of Pt or a Pt alloy by contacting a Cu ion-containing acidic aqueous solution with at least a portion of a Cu electrode
Implementation Method 2
the Cu monoatomic layer on the Pt is then galvanically displaced by Au
Data Source
AI summary
A method of producing a displacement plating precursor, including a deposition step of depositing a Cu layer on a surface of a core particle formed of Pt or a Pt alloy by contacting a Cu ion-containing acidic aqueous solution with at least a portion of a Cu electrode, and contacting the Cu electrode with the core particle or with a composite, in which the core particle is supported on an electroconductive support, within the acidic aqueous solution or outside the acidic aqueous solution, and moreover contacting the core particle with the acidic aqueous solution under an inert gas atmosphere.