Conductive Diamond Electrode with Niobium Coating for Corrosion Resistance
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Solution Overview
Problem
Existing diamond electrodes for industrial electrolysis face challenges in durability, cost, and size limitations due to the high reactivity of conventional substrates and the high thermal expansion coefficient mismatch between diamond and commonly used materials like titanium, leading to instability and reduced lifespan.
Innovation Solution
A conductive diamond electrode with a coating layer comprising niobium or tantalum, applied using methods like hot dipping, CVD, or PVD, is formed on a titanium substrate to enhance stability and corrosion resistance, allowing for large-scale production and long-term operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diamond is used as an electrode material, then corrosion resistance and durability are improved, but manufacturing complexity and cost increase due to the need for specialized CVD processes and substrate preparation
Solution Approach 1:
The patent applies preliminary action by forming a specific substrate structure (titanium substrate with iridium oxide coating) before diamond deposition. This pre-prepared substrate provides optimal adhesion and electrical conductivity, simplifying the overall manufacturing process while ensuring reliable diamond electrode performance in corrosive environments
Solution Approach 2:
The patent uses composite materials by combining titanium substrate, iridium oxide coating layer, and diamond layer into a multi-layer structure. Each layer provides specific functions: titanium provides mechanical strength and corrosion resistance, iridium oxide provides catalytic activity and electrical conductivity, and diamond provides chemical inertness and durability
2Ease of manufacture
If conventional substrates like titanium are used, then mechanical strength and ease of manufacture are improved, but thermal expansion coefficient mismatch with diamond causes instability and reduced lifespan
Solution Approach 1:
The patent introduces an intermediary layer (iridium oxide coating) between the titanium substrate and diamond layer. This intermediary layer acts as a buffer that accommodates the thermal expansion coefficient mismatch between titanium and diamond, preventing stress concentration and delamination while maintaining the ease of manufacturing with titanium substrate
3Productivity
If expensive noble metals like platinum are used as electrode catalysts, then catalytic activity is improved, but cost and consumption over time increase
Solution Approach 1:
The patent applies parameter changes by modifying the physical and chemical properties of the electrode surface through iridium oxide coating. This coating provides high catalytic activity comparable to platinum but with better stability and lower consumption, as the oxide layer forms a protective barrier that prevents metal dissolution while maintaining electrocatalytic function
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 solution provides a stable, cost-effective, and lightweight diamond electrode with improved mechanical strength and corrosion resistance, enabling efficient electrolysis processes such as ozone and hydrogen peroxide production while maintaining electrode integrity over extended periods.
Implementation Method 1
A conductive diamond electrode with a coating layer comprising niobium or tantalum, applied using methods like hot dipping, CVD, or PVD
Implementation Method 2
a conductive diamond layer formed on a surface of the coating layer
Implementation Method 3
An electrolytic process is a process in which electrical energy, which is a clean energy, is utilized to conduct chemical reactions on the electrode surfaces
Data Source
AI summary
The present invention provides a conductive diamond electrode having: a conductive substrate; a coating layer formed on a surface of the conductive substrate, the coating layer containing one of a metal and an alloy each including at least one of niobium and tantalum; and a conductive diamond layer formed on a surface of the coating layer, and a process for producing the conductive diamond electrode.