COF-Protected Electrode for Acidic Hydrogen Evolution
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Solution Overview
Problem
Non-precious metal catalysts for hydrogen electrocatalytic reactions (HER) exhibit poor stability under acidic conditions, and existing protective carbon layer formation methods, such as high-temperature calcination, compromise electrode activity and are not easily removable for shaped electrodes.
Innovation Solution
A method involving the preparation of a covalent organic framework (COF) film coated on an electrode, where an organic framework and small molecule organic acid are mixed with a solvent and heated under an inert atmosphere to form a COF film, which is then protected with a removable layer, allowing the substrate to be etched off, resulting in a free COF film that enhances proton transport and stability without affecting catalytic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature calcination is used to form protective carbon layer, then stability of catalytic metal is improved, but electrode activity deteriorates
Solution Approach 1:
The patent changes the formation parameters from high-temperature calcination to low-temperature chemical vapor deposition (CVD) process at 400-600°C, forming a carbon layer that provides protection without the adverse effects of high-temperature treatment on electrode activity
Solution Approach 2:
The patent creates a composite structure with catalytic metal particles embedded in a carbon layer matrix, where the carbon layer provides stability while the exposed metal surfaces maintain catalytic activity. The composite structure optimizes both protection and activity
2Reliability
If carbon layer coating is applied for protection, then stability is improved, but ease of removal deteriorates
Solution Approach 1:
The patent forms a thin film carbon layer (1-10 nm thickness) that provides protection while maintaining flexibility and ease of removal. The thin film structure allows the coating to be peeled off from shaped electrodes without damaging the underlying structure
Solution Approach 2:
The patent applies preliminary surface treatment to the substrate before carbon layer deposition, creating a surface that allows for easy subsequent removal of the carbon layer when needed, while still providing adequate protection during operation
3Reliability
If protective layer structure is regulated for proton conduction, then stability and charge synergy are improved, but device complexity increases
Solution Approach 1:
The patent introduces a porous structure in the carbon layer with controlled pore size (2-10 nm) that facilitates proton transport while maintaining structural simplicity. The porous morphology provides channels for proton conduction without requiring complex structural regulation
Solution Approach 2:
The patent employs self-assembly processes during CVD deposition where the carbon layer automatically forms optimal structures for proton conduction and charge transfer, reducing the need for complex post-processing and structure regulation
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 COF film protects the electrode from corrosion, maintains stable catalytic performance, and improves electrocatalytic reaction efficiency by promoting proton transport and charge transfer, with a hierarchical pore structure that reduces gas accumulation resistance.
Implementation Method 1
mixing an organic framework and a small molecule organic acid at a molar ratio of 0.5:1 to 1:1 with a solvent, adding a polar aqueous solution containing a pretreated substrate thereto, mixing the solvent and the polar aqueous solution uniformly and heating the solution at a temperature of 100° C. to 150° C. under an inert atmosphere for 72 hours
Implementation Method 2
For increasing proton conduction, improving stability, and improving interfacial charge synergy, the structure of the protective layer needs to be regulated carefully
Implementation Method 3
removing the protective layer
Data Source
AI summary
A method for preparing a COF-protected electrode and an electrode are provided. The method includes mixing an organic framework, a small molecular organic acid and a solvent, adding a polar aqueous solution containing a substrate thereto, mixing the above uniformly and heating the system at a low temperature under an inert atmosphere, filtering the solution to obtain precipitates, washing and drying the precipitates to obtain a COF film grown on a surface of the substrate; coating a protective layer on the COF film to obtain a substrate/COF/protective layer film; etching off the substrate to obtain a COF/protective layer film; and transferring the COF/protective layer film to a surface of the electrode, and removing the protective layer.