Gas sensor and method for use thereof

US7048844B2 · kind B2 · utility

Assignee

• Delphi Technologies · US

Inventors

• David K. Chen · Rochester Hills, US
• Da Yu Wang · Troy, US
• Yingjie Lin · El Paso, US
• Raymond L. Bloink · Swartz Creek, US
• Devesh Srivastava · Redmond, US
• Walter T. Symons · Davison, US
• Kaius K. Polikarpus · Davison, US

Key dates

• Filing date: Nov 15, 2002
• Grant date: May 23, 2006
• Expiry date: Mar 14, 2024

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/419
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A sensor comprises: a pump cell comprising an inner pump electrode, an outer pump electrode, a pump cell electrolyte layer interposed between the inner pump electrode and the outer pump electrode and a cell isolation layer disposed on the inner pump electrode on a side opposite the pump cell electrolyte, wherein the outer electrode is in fluid communication with a reducing gas. A reference cell is in operable communication with the pump cell, the reference cell comprising an outer reference electrode and an inner reference electrode, and a reference cell electrolyte interposed between the outer reference electrode and the inner reference electrode. A diffusion limiting material flanks both sides of a chamber formed between the cell isolation layer and a cell separation layer, wherein the cell separation layer comprises a via coaxial and in fluid communication with the inner pump electrode, the diffusing limiting material, and the outer reference electrode, and wherein the diffusion limiting material has a gas permeability such that the limiting current of oxygen in air is about 0.05 mA to about 5 mA per cm2 of pump electrode area.