Electrochemical Sulfur Sensor Using Composite Conductive Materials
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Solution Overview
Problem
Existing sulfur sensors are not capable of accurately and reliably detecting a wide range of sulfur concentrations, including ultra-low levels, in liquids, especially in field or on-board applications, due to their size, calibration requirements, and sensitivity to different sulfur organic species in diesel fuels.
Innovation Solution
An electrochemical sulfur sensor with a sensing material that exhibits both electronic and ionic conductivity, composed of a metallic cation and graphite, which changes its electrical output in response to sulfur compounds, allowing for accurate detection of sulfur concentrations in diesel fuels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfur sensors are used, then they can detect sulfur compounds in simulated diesel fuel, but they fail to accurately detect sulfur compounds in commercially available diesel fuel
Solution Approach 1:
The patent combines multiple sensing materials (metal oxide semiconductor and ion conductive ceramic) into a single sensor structure, allowing the sensor to detect various sulfur organic species through complementary detection mechanisms. This merging enables reliable detection across different fuel types by aggregating multiple detection pathways.
Solution Approach 2:
The sensor employs composite sensing materials including metal oxide semiconductors and ion conductive ceramics, which together provide both electronic and ionic conduction capabilities. This composite material approach enables the sensor to respond to diverse sulfur organic species in commercial diesel fuel, resolving the limitation of conventional single-material sensors.
2Measurement precision
If ion conductive ceramic membranes are used, then ionic conductivity changes can be measured, but the sensor cannot detect ultra-low sulfur concentrations below 15 ppm
Solution Approach 1:
The patent utilizes changes in multiple parameters (electronic conductivity, ionic conductivity, and potential) of the sensing materials in response to sulfur compounds. By monitoring multiple electrical parameters simultaneously, the sensor achieves reliable detection at ultra-low sulfur concentrations below 15 ppm, overcoming the limitations of single-parameter detection.
Solution Approach 2:
The ion conductive ceramic membrane acts as an intermediary that facilitates the interaction between sulfur compounds and the sensing electrode. The membrane's dual conduction properties enable it to mediate the detection process, allowing accurate measurement of ultra-low sulfur concentrations by translating chemical interactions into measurable electrical signals.
3Measurement precision
If complex sensor designs are used to improve detection accuracy, then measurement precision increases, but device complexity and manufacturing cost increase
Solution Approach 1:
The sensor design uses sensing materials that perform multiple functions: metal oxide semiconductors provide electronic conduction for detecting various sulfur species, while ion conductive ceramics provide ionic conduction for enhanced sensitivity. This multi-functionality within a unified sensor structure achieves high measurement precision without proportionally increasing device complexity.
Solution Approach 2:
The patent applies different sensing materials with specific properties to different regions or functions within the sensor. The metal oxide semiconductor layer handles electronic conduction while the ion conductive ceramic layer handles ionic conduction, allowing each material to optimize its local function while contributing to overall accurate detection.
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 sensor provides a robust and accurate measurement of sulfur concentrations across a wide range, including ultra-low levels, enabling fast, inexpensive, and portable detection suitable for on-board diagnostics and continuous monitoring.
Implementation Method 1
the sensing material includes an electronic conductive material and a metal cation... the sensing material exhibits both electronic and ionic conductivity in the presence of the sulfur-comprising liquid
Implementation Method 2
the sensing material exhibits both electronic and ionic conductivity in the presence of the sulfur-comprising liquid
Implementation Method 3
The sensor provides a robust and accurate measurement of sulfur concentrations... changes its electrical output in response to sulfur compounds
Data Source
AI summary
This disclosure relates to sulfur sensors that utilize sensing materials that can be used to detect a wide range of concentrations including ultra low concentrations of sulfur in liquids, such as below even 15 ppm. The sulfur sensors comprise a sensing electrode having a material that contributes an electronic output to the analysis and a material that contributes an ionic output to the analysis.