Nextech Materials, Ltd.

Battelle Memorial Institute

Nexceris Innovation Holdings, LLC

Hewlett-Packard Development Company, L.p.

Emerson Electric Company

The Ohio State University

Praxair Technology, Inc.

Nexceris, LLC

Nexttech Materials, Ltd.

Scott Lawrence Swartz

Matthew M Seabaugh

Michael J Day

William John Dawson

Paul H Matter

Lora B Thrun

Buddy E McCormick

Christopher T Holt

Stephen Randall Cummings

Gene B Arkenberg

Jared R Archer

Daniel A Kearl

Thomas R Shrout

Scott A Barnett

Prabir K Dutta

Richard Budd Peterson

Gary Tarver

Peter J Melling

John Gilman

Nicholas Brannigan Frank

Stephen R Cummings

Chad T Sellers

Ramachandra Rao Revur

Davion Matthew Hill

Benjamin H Gully

Sergio Ibanez

Lora B Thurn

An amperometric electrochemical sensor for measuring the concentrations of one or more target gas species in a gas sample or gas stream, the sensor having at least one electrochemical cell with first and second surface electrodes, an electrolyte layer and a passive signal amplifying layer ('SAL') comprising electrically conductive material like platinum, wherein at least a portion of the electrolyte layer is located between the surface electrodes and the SAL such that the SAL is in direct, conductive contact with the electrolyte layer but is not in direct contact with the surface electrodes. Sensor systems and detection methods are also provided.

Amperometric electrochemical sensors, sensor systems and detection methods

Systems and methods are described herein for monitoring a gas source for a gas analyte. The gas source can be monitored for release of the gas analyte, for example, during a given gas source state. A sensor signal can be generated characterizing an amount of the gas analyte being released by the gas source. The gas sensor signal can be evaluated relative to a threshold. An alert signal can be generated based on a result of the comparison to provide a warning that unwanted and/or hazardous amounts of gas is being released by the gas source.

Systems and methods for monitoring for a gas analyte

A sulfur tolerant anode current collector material includes a mesh or foam that includes a cermet. The cermet includes a metallic component and a ceramic component. The metallic component includes nickel, an alloy including nickel and cobalt, or a mixture including a nickel compound and a cobalt compound. The ceramic component includes a mixed conducting electrolyte material.

Current collectors for solid oxide fuel cell stacks

Provided are a composition including a hydrogen-selective porous composite, a hydrogen gas sensor device including the hydrogen-selective porous composite, a kit for detecting hydrogen including the hydrogen gas sensor device, and a method for detecting hydrogen including contacting a hydrogen-comprising gas to the hydrogen selective porous composite. The method may include, for example: providing a hydrogen-comprising gas; providing a hydrogen-selective porous composite, the hydrogen-selective porous composite comprising cerium oxide; contacting the hydrogen-comprising gas to the hydrogen-selective porous composite; and selectively detecting hydrogen in the hydrogen-comprising gas according to a decrease in an electrical resistance of the hydrogen-selective porous composite.

Hydrogen-selective porous composite

Electrode materials systems for planar solid oxide fuel cells with high electrochemical performance including anode materials that provide exceptional long-term durability when used in reducing gases and cathode materials that provide exceptional long-term durability when used in oxygen-containing gases. The anode materials may comprise a cermet in which the metal component is a cobalt-nickel alloy. These anode materials provide exceptional long-term durability when used in reducing gases, e.g., in SOFCs with sulfur contaminated fuels. The cermet also may comprise a mixed-conducting ceria-based electrolyte material. The anode may have a bi-layer structure. A cerium oxide-based interfacial layer with mixed electronic and ionic conduction may be provided at the electrolyte/anode interface.

High performance multilayer electrodes for use in reducing gases

An amperometric electrochemical sensor configured to be operable in an oxidizing atmosphere and under an applied bias to exhibit enhanced reduction of oxygen molecules at the sensing electrode in the presence of one or more target gas species and a resulting measurable increase in oxygen ion flux through the cell. The sensor has an electrolyte membrane, a sensing electrode on the electrolyte membrane, and a counter electrode on the electrolyte membrane, wherein the sensing electrode includes at least one molybdate or tungstate compound. An electrochemical sensor system is also provided, along with a method of detecting the concentration of one or more of NOx and NHin a gas sample or stream.

This disclosure relates to a method of densifying a lanthanide chromite ceramic or a mixture containing a lanthanide chromite ceramic. The method comprises mixing one or more lanthanide chromite ceramics with one or more sintering aids, and sintering the mixture. The one or more lanthanide chromite ceramics are represented by the formula (LnAE)CrBO, wherein Ln is a lanthanide element or yttrium, AE is one or more alkaline earth elements, B is one or more transition metals, x is a value less than 1, y is a value less than or equal to 0.5, and z is a value from 0.8 to 1.2. The sintering aids comprise one or more spinel oxides. The one or more spinel oxides are represented by the formula ABOor ABOwherein A and B are cationic materials having an affinity for B-site occupancy in a lanthanide chromite ceramic structure, e.g., ZnMnO, MgMnO, MnMnOand CoMnO. This disclosure also relates in part to products, e.g., dense ceramic structures produced by the above method.

Sintering aids for lanthanide ceramics

An electrochemical device having one or more solid oxide fuel cells (SOFCs), each of the SOFCs including a cathode, an anode, and an electrolyte layer positioned between the cathode and anode; and at least one additional component comprising a metallic substrate having an electronically conductive, chromium-free perovskite coating deposited directly thereon. The perovskite coating has the formula ABO, wherein A is a lanthanide element or Y, and B is a mixture of two or more transition elements, with the A site undoped by any alkaline earth element, and the perovskite coating exhibits limited or no ionic transport of oxygen.

Protective coatings for metal alloys and methods incorporating the same

A hydrogen sensitive composite sensing material based on cerium oxide with or without additives to enhance sensitivity to hydrogen, reduce cross-sensitivities to interfering gases, or lower the operating temperature of the sensor, and a device incorporating these hydrogen sensitive composite materials including a support, electrodes applied to the support, and a coating of hydrogen sensitive composite material applied over the electroded surface. The sensor may have in integral heater. The sensor may have a tubular geometry with the heater being inserted within the tube. A gas sensor device may include a support, electrodes applied to the support, and a dual sensor element to cancel unwanted effects on baseline resistance such as those resulting from atmospheric temperature changes. The hydrogen sensitive composite material or other gas sensitive materials may be used in the dual element gas sensor device.

Hydrogen sensitive composite material, hydrogen gas sensor, and sensor for detecting hydrogen and other gases with improved baseline resistance

Amperometric ceramic electrochemical cells comprise, in one embodiment, an electrolyte layer, a sensing electrode layer comprising a ceramic phase and a metallic phase, and a counter electrode layer, wherein the cell is operable in an oxidizing atmosphere and under an applied bias to exhibit enhanced reduction of oxygen molecules at the sensing electrode in the presence of one or more target gases such as nitrogen oxides (NO) or NHand a resulting increase in oxygen ion flux through the cell. In another embodiment, amperometric ceramic electrochemical cells comprise an electrolyte layer comprising a continuous network of a first material which is ionically conducting at an operating temperature of about 200 to 550&#xb0; C.; a counter electrode layer comprising a continuous network of a second material which is electrically conductive at an operating temperature of about 200 to 550&#xb0; C.; and a sensing electrode layer comprising a continuous network of a ceramic phase and a metallic phase which is electrically conductive at an operating temperature of about 200 to 550&#xb0; C., which sensing electrode is operable to exhibit increased charge transfer in the presence of one or more target gas species. These electrochemical cells and additional electrochemical cell embodiments are suitable for use in gas sensors and methods of sensing or detecting one or more target gases.

Amperometric electrochemical cells and sensors

A repeat unit for a fuel cell stack, the repeat unit having: a conductive interconnect plate; an electrolyte-supported fuel cell, wherein a dense sealing perimeter extends around the entire perimeter of the fuel cell; a cathode gasket adjacent the cathode side of the fuel cell; and an anode gasket adjacent the anode side of the fuel cell. First and second air manifolding ports, and first and second fuel manifolding ports are provided in each of the interconnect plate, dense sealing perimeter of the fuel cell, cathode gasket and anode gasket. An SOFC stack having an aligned stack of a plurality of repeat units is also provided, as well as an SOFC stack configured for cascade fuel flow.

Fuel cell repeat unit and fuel cell stack

A method of making ceramic electrode materials comprising intimate mixtures of two or more components, including at least one nanoscale ionically conducting ceramic electrolyte material (e.g., yttrium-stabilized zirconia, gadolinium-doped ceria, samarium-doped ceria, etc.) and at least one powder of an electrode material, which may be an electrically conducting ceramic electrode material (e.g., lanthanum strontium manganite, praseodymium strontium manganese iron oxide, lanthanum strontium ferrite, lanthanum strontium cobalt ferrite, etc.) or a precursor of a metallic electrode material (e.g., nickel oxide, copper oxide, etc.). The invention also includes anode and cathode coatings and substrates for solid oxide fuel cells prepared by this method.

Nano-composite electrodes and method of making the same

The invention relates to perovskite oxide electrode materials in which one or more of the elements Mg, Ni, Cu, and Zn are present as minority components that enhance electrochemical performance, as well as electrode products with these compositions and methods of making the electrode materials. Such electrodes are useful in electrochemical system applications such as solid oxide fuel cells, ceramic oxygen generation systems, gas sensors, ceramic membrane reactors, and ceramic electrochemical gas separation systems.

Perovskite electrodes and method of making the same

Aqueous coating slurries useful in depositing a dense coating of a ceramic electrolyte material (e.g., yttrium-stabilized zirconia) onto a porous substrate of a ceramic electrode material (e.g., lanthanum strontium manganite or nickel/zirconia) and processes for preparing an aqueous suspension of a ceramic electrolyte material and an aqueous spray coating slurry including a ceramic electrolyte material. The invention also includes processes for depositing an aqueous spray coating slurry including a ceramic electrolyte material onto pre-sintered, partially sintered, and unsintered ceramic substrates and products made by this process.

Growing community of inventors

Columbus, OH, United States of America

Scott Lawrence Swartz