Gas sensor and method for use thereof
First Claim
1. A sensor comprising:
- 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, a reference cell 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; and
a diffusion limiting material flanking 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.
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Accused Products
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.
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Citations
18 Claims
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1. A sensor comprising:
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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, a reference cell 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; and
a diffusion limiting material flanking 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for measuring reducing gas concentration in a gas comprising:
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exposing a sensor to air, wherein the sensor comprises a pump cell, a reference cell, and a cell separation layer interposed between the pump cell and the reference cell, wherein the pump cell comprises an outer pump electrode exposed to the gas, an inner pump electrode in operable communication with a diffusion limiting material by means of a cell isolation layer, and a pump cell electrolyte interposed between the inner pump electrode and the outer pump electrode, wherein the reference cell comprises an outer reference electrode in operable communication with the diffusion limiting material, an inner reference electrode in fluid communication with a reference gas source and a reference electrolyte interposed between the outer reference electrode and the inner reference electrode, and wherein the diffusion limiting material comprises 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. applying a voltage to the outer pump electrode and the inner pump electrode to form a limiting current;
diffusing oxygen molecules and reducing gases across the diffusion limiting material;
generating an electromotive force signal between the outer reference electrode and the inner reference electrode;
adjusting the pump current to maintain the electromotive force signal at a predetermined value, wherein the limiting current is proportional to the reducing gases. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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Specification