METHOD AND Pd/V2 O5 DEVICE FOR H2 DETECTION

• US 20090053822A1
• Filed: 03/31/2008
• Published: 02/26/2009
• Est. Priority Date: 05/05/2001
• Status: Active Grant

• Current Assignee: Alliance For Sustainable Energy LLC
• Original Assignee: Alliance For Sustainable Energy LLC
• Inventors: Liu, Ping, Smith, R. Davis II, Pitts, J. Roland, Lee, Se-Hee, Tracy, C. Edwin
• Granted Patent: US 8,084,265 B2
• Time in Patent Office: Days
• US Class Current: 436/144
• CPC Class Codes: G01N 21/783 for analysing gases
• CPC Class Codes: G01N 31/22 using chemical indicators G01N31/02 takes precedence
• CPC Class Codes: G01N 33/005 for H2
• CPC Class Codes: Y10T 436/22 Hydrogen, per se

Abstract

Methods and Pd/V₂O₅ devices for hydrogen detection are disclosed. An exemplary method of preparing an improved sensor for chemochromic detection of hydrogen gas over a wide response range exhibits stability during repeated coloring/bleaching cycles upon exposure and removal of hydrogen gas. The method may include providing a substrate. The method may also include depositing a V₂0₅ layer that functions as a H₂ insertion host in a Pd/V₂0₅ hydrogen sensor to be formed on said substrate. The method may also include depositing a Pd layer onto said V₂0₅ layer; said Pd layer functioning as an optical modulator.

Claims

1. A method of preparing an improved sensor for chemochromic detection of hydrogen gas over a wide response range, that exhibits stability during repeated coloring/bleaching cycles upon exposure and removal of hydrogen gas, comprising:

providing a substrate;

depositing a V₂0₅ layer that functions as a H₂ insertion host in a Pd/V₂0₅ hydrogen sensor to be formed on said substrate; and

,

depositing a Pd layer onto said V₂0₅ layer;

said Pd layer functioning as an optical modulator.

2. An improved method of chemochromic detection of hydrogen gas over a wide range that exhibits stability during repeated coloring/bleaching cycles upon exposure and removal of hydrogen gas, comprising:

subjecting a sensor structure comprising a substrate, a layer of V₂0₅ coated on said substrate, and a layer of palladium (Pd) coated on said layer of V₂0₅ to an environment comprising hydrogen to cause a reaction governed by the equation;

5. The method of claim 2 wherein said palladium layer is deposited by evaporation.

3. The method of detection of claim 3 wherein the Pd/V₂0₅ structure is not saturated a 2% H₂ or higher.

4. The method of claim 3 wherein hydrogen gas over a wide range that exhibits stability during repeated coloring/bleaching cycles is between about 1 to about 100% H₂ concentration.