Diamond Electrodes for Harsh Environment Chemical Analysis
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Solution Overview
Problem
Current techniques for analyzing chemical species in complex environments, such as those in oil and gas applications, face challenges with detecting low concentrations and distinguishing between multiple species due to overlapping peaks in stripping voltammetry data, and are not robust enough for harsh conditions, especially when using standard metal electrodes that interfere with spectroscopic methods.
Innovation Solution
A method and sensor configuration utilizing synthetic electrically conductive diamond electrodes for electrochemical deposition and in-situ spectroscopic analysis, which allows for the detection of a wide range of chemical species at lower concentrations and improved species discrimination, with the diamond electrodes being inert and transparent to spectroscopic techniques, enabling robust operation in harsh environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard metal electrodes are used for electrochemical analysis, then electrochemical sensing can be performed, but the electrodes interfere with spectroscopic methods and are not robust enough for harsh environments
Solution Approach 1:
The patent changes the material parameter of the electrode from standard metal to boron-doped diamond, which fundamentally alters the material properties to achieve both spectroscopic transparency and electrochemical functionality. This parameter change enables the electrode to be transparent to infrared and Raman spectroscopy while maintaining robustness in harsh environments including high temperatures, strong acids, and strong bases.
Solution Approach 2:
The patent uses boron-doped diamond as a composite material that combines properties of both optical transparency (for spectroscopy) and electrochemical activity. The diamond matrix provides chemical inertness and thermal stability, while boron doping introduces electrical conductivity and electrochemical sensing capability, creating a material that simultaneously satisfies multiple conflicting requirements.
2Ease of manufacture
If single-piece boron doped diamond electrodes are used, then manufacturing is simplified, but the ability to perform multiple sensing functions is limited
Solution Approach 1:
The patent segments the electrode into multiple functional regions with different geometries (planar surfaces, channels, high aspect ratio structures) that can perform different sensing functions simultaneously. Each segment can be optimized for specific analytes or spectroscopic techniques while maintaining compatibility with the overall diamond electrode structure.
Solution Approach 2:
The patent designs the diamond electrode to serve multiple functions: electrochemical sensing of different species, spectroscopic analysis (IR, Raman), and flow-through analysis. The universal diamond material platform supports various electrode geometries and configurations that can be tailored for specific applications while maintaining ease of manufacture through diamond's inherent properties.
3Adaptability or versatility
If complex multi-structural diamond electrodes are manufactured, then multiple sensing functions are enabled, but manufacturing difficulty increases significantly
Solution Approach 1:
The patent uses diamond as an intermediary material that can be deposited onto various substrate geometries. Rather than manufacturing complex structures from bulk diamond, the diamond coating serves as a mediator that can be applied to pre-formed substrates with desired geometries, then functionalized for electrochemical and spectroscopic sensing, thereby reducing manufacturing complexity while maintaining multi-structural capabilities.
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 use of conductive diamond electrodes enhances electrochemical deposition and spectroscopic analysis, allowing for improved sensitivity and species identification in complex solutions, even in remote or harsh environments, without the need for additional devices or extraction of electrodes, and provides a compact, robust sensor for field use.
Implementation Method 1
applying a potential difference between the first and second electrodes such that current flows between the first and second electrodes through the solution to be analysed and chemical species are electro-deposited from the solution onto the first electrode
Implementation Method 2
applying a spectroscopic analysis technique to the electro-deposited chemical species on the first electrode to generate spectroscopic data about the electro-deposited chemical species on the first electrode
Data Source
AI summary
A method of analyzing chemical species in a solution, the method comprising: providing an electrochemical deposition apparatus comprising a first electrode (2) formed of an electrically conductive diamond material and a second electrode (4); locating the first electrode in contact with a solution (8) to be analyzed and the second electrode in electrical contact with the solution to be analyzed; applying a potential difference between the first and second electrodes (2, 4) such that current flows between the first and second electrodes through the solution to be analyzed and chemical species are electro-deposited from the solution onto the first electrode; applying a spectroscopic analysis technique to the electro-deposited chemical species (M1, M2, M3) on the first electrode to generate spectroscopic data about the electro-deposited chemical species on the first electrode; and using the spectroscopic data to determine the type of chemical species electro-deposited on the first electrode. The spectroscopic analysis technique, which can be based on X-rays, fluorescent X-rays or gamma rays, is used in combination with stripping voltammetric measurement performed on the first electrode. The spectroscopic data can also be used in-situ calibration data for calibrating the reference potential used voltammetric measurements.