Electrochemical sensor system

• US 20060118416A1
• Filed: 12/08/2004
• Published: 06/08/2006
• Est. Priority Date: 12/08/2004
• Status: Abandoned Application

• Current Assignee: Honeywell International Inc.
• Original Assignee: Honeywell International Inc.
• Inventors: Liu, James Z., Nickels, Robert A.
• Application Number:
  US11/010,221
• Publication Number:
  US 20060118416A1
• Time in Patent Office: Days
• US Class Current: 204/431
• CPC Class Codes: G01N 27/4163 checking the operation of, or calibrating, the measuring apparatus G01N27/3274, G01N27/4175 and G01N33/0006 take precedence
• CPC Class Codes: G01N 33/0006 Calibrating gas analysers
• CPC Class Codes: G01N 33/0031 comprising two or more sensors, e.g. a sensor array electrochemical electrode arrays G01N27/27
• CPC Class Codes: G01N 33/005 for H2

Abstract

An electrochemical sensor system includes a filter comprising a micro-porous solid possessing a large surface area, wherein the solid porous material may contain alkaline materials and the filter is located within a container sealed with a cap, and includes a water reservoir containing water or a water-based solution and a heater disposed proximate to the water reservoir. The heater can be utilized to heat the water reservoir. This sensor system further comprises a heater and hydrogen generating chamber disposed proximate to the charcoal filter within the container. Additionally, a layer comprising water trapped within a polymer matrix can be provided wherein the layer is located below the heater and hydrogen generating chamber within the container in order to slow down water evaporation and provided extended electrochemical sensing capabilities for the electrochemical sensor system.

Claims

1. An electrochemical sensor system, comprising:

a filter comprising a micro-porous solid possessing a large surface area, wherein said filter is located within a container sealed with a cap a heater and hydrogen generating chamber disposed proximate to said charcoal filter within said container; and

a layer comprising water trapped within a polymer matrix, wherein said layer is located below said heater and hydrogen generating chamber within said container in order to slow down water evaporation and provided extended electrochemical sensing capabilities for said electrochemical sensor system.

2. The system of claim 1, further comprising:

a water reservoir containing water or a water-based solution, wherein said water reservoir is located within said container sealed with said cap; and

a heater disposed proximate to said water reservoir, wherein said heater is utilized to heat said water reservoir.

3. The system of claim 2 wherein said water trapped within said polymer matrix comprises a water-gel.

4. The system of claim 3 further comprising at least one hydrophobic layer disposed between said filter and said water-gel.

5. The system of claim 3 wherein said water-gel includes an antiseptic solution.

6. The system of claim 3 further comprising:

a gas diffusion control layer disposed between said heater and hydrogen generating chamber and said at least one hydrophobic layer, wherein a plurality of holes are formed from said gas diffusion control layer, which link said heater and hydrogen generating chamber to said at least on hydrophobic layer.

7. The system of claim 6 further comprising one or more electrolytes and catalyst electrodes disposed between a first hydrophobic layer and a second hydrophobic layer of said at least one hydrophobic layer.

8. The system of claim 2 wherein said container comprises nickel-plated steel and said cap comprises nickel-plated steel.

9. The system of claim 2 wherein said large area of said micro-porous solid posses an area in a range of approximately 200 m2/g to 1000 m₂/g.

10. An electrochemical sensor system, comprising:

a filter comprising a micro-porous solid possessing a large surface area, wherein said filter is located within a container sealed with a cap

a water reservoir containing water or a water-based solution, wherein said water reservoir is located within said container sealed with said cap

a heater disposed proximate to said water reservoir, wherein said heater is utilized to heat said water reservoir

a heater and hydrogen generating chamber disposed proximate to said charcoal filter within said container;

a water-gel layer comprising water trapped within a polymer matrix, wherein said water-gel layer is located below said heater and hydrogen generating chamber within said container in order to slow down water evaporation and wherein said water-gel includes an antiseptic solution;

at least one hydrophobic layer disposed between said filter and said water-gel;

a gas diffusion control layer disposed between said heater and hydrogen generating chamber and said at least one hydrophobic layer, wherein a plurality of holes are formed from said gas diffusion control layer, which link said heater and hydrogen generating chamber to said at least on hydrophobic layer; and

wherein one or more electrolytes and catalyst electrodes disposed between a first hydrophobic layer and a second hydrophobic layer of said at least one hydrophobic layer, thereby providing extended electrochemical sensing capabilities for said electrochemical sensor system.

11. The system of claim 10 wherein said container comprises nickel-plated steel and said cap comprises nickel-plated steel.

12. The system of claim 10 wherein said large area of said micro-porous solid posses an area in a range of approximately 200 m²/g to 1000 m₂/g.

13. The system of claim 10 wherein said large area of said micro-porous solid contains alkaline materials

14. An electrochemical sensor system, comprising:

an array of electrochemical sensors associated with a sensor package, wherein each sensor among said array of sensors is classified according to its response to a set of analytes and wherein each sensor is configured from a different catalyst and/or coating; and

wherein each catalyst and/or coating selected responds different to one or more members among a group of analytes thereby producing a unique signature for each analyte thereof and providing multiple electrochemical sensing capabilities thereof.

15. The system of claim 14 further comprising an electrode associated with each sensor of said array.

16. The system of claim 15 wherein said set of analytes and said electrode are selected from a list of materials respectively comprising at least one of the following types of analyte and electrode materials:

Carbon monoxide;

Platinum, Ruthenium;

Hydrogen Sulphide;

Platinum, Gold;

Oxygen;

Platinum, Gold, Silver, Rhodium;

Hydrogen;

Palladium, Platinum, Gold;

Sulpher Dioxide;

Gold; and

Carbon Dioxide;

Platinum, Silver.

17. The system of claim 15 wherein said an array of electrochemical sensors associated with said sensor package comprises four sensors.

18. The system of claim 15 wherein said an array of electrochemical sensors associated with said sensor package comprises two sensors, including a first sensor and a second sensor.

19. The system of claim 18 wherein said first sensor is more sensitive to H₂ and less sensitive to CO and said second sensor is more sensitive to CO and less sensitive to CO.

20. The system of claim 19 wherein said first sensor is associated with a Pt electrode and said second sensor is associated with a Pd electrode.

21. The system of claim 20 wherein said first sensor and said second sensor each possess a cross-sensitivity with H₂ and CO, thereby contributing a response from said first and second sensors that determines a concentration of H₂ and CO.

22. The system of claim 15 wherein each sensor of said array comprises self-test and self-calibration features.