EP2195647A2 - Utilisation d'un conducteur d'ions pour un capteur de gaz - Google Patents

Utilisation d'un conducteur d'ions pour un capteur de gaz

Info

Publication number
EP2195647A2
EP2195647A2 EP08837966A EP08837966A EP2195647A2 EP 2195647 A2 EP2195647 A2 EP 2195647A2 EP 08837966 A EP08837966 A EP 08837966A EP 08837966 A EP08837966 A EP 08837966A EP 2195647 A2 EP2195647 A2 EP 2195647A2
Authority
EP
European Patent Office
Prior art keywords
ion conductor
exhaust gas
substrate
determination
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08837966A
Other languages
German (de)
English (en)
Inventor
Martin Turwitt
Karlheinz Wienand
Karlheinz Ullrich
Tim Asmus
Jürgen Dittrich
Ulrich SCHÖNAUER
Ulrich Guth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
J Dittrich Elektronic & Cokg GmbH
Heraeus Nexensos GmbH
Original Assignee
J Dittrich Elektronic & Cokg GmbH
Heraeus Sensor Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by J Dittrich Elektronic & Cokg GmbH, Heraeus Sensor Technology GmbH filed Critical J Dittrich Elektronic & Cokg GmbH
Priority to EP10005986A priority Critical patent/EP2226628A1/fr
Priority to EP10006033A priority patent/EP2226629A1/fr
Publication of EP2195647A2 publication Critical patent/EP2195647A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4073—Composition or fabrication of the solid electrolyte
    • G01N27/4074—Composition or fabrication of the solid electrolyte for detection of gases other than oxygen
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/403—Cells and electrode assemblies
    • G01N27/406—Cells and probes with solid electrolytes
    • G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
    • G01N27/4077—Means for protecting the electrolyte or the electrodes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
    • G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
    • G01N33/0037—NOx
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention relates to the measurement of undesirable gases in the exhaust gas of internal combustion engines or incinerators, a related use of oxygen pumps and suitable sensors.
  • oxygen pumps are based on an electrochemical reaction of zirconium dioxide between two electrodes.
  • This device is capable of transporting oxygen from one side of a zirconia wall via its reduction to oxygen ions at the cathode, ion migration of the oxygen ions in ZrO 2 and oxidation of the oxygen ions to oxygen at the anode to the other side. In this way, a different partial pressure on the two sides can be achieved.
  • the object of the present invention is to integrate a reliable exhaust gas analysis, in particular NO x measurement, in a simple manner in internal combustion engines or incinerators.
  • an ion conductor or an oxygen pump in particular a material pairing of noble metal electrodes and zirconium dioxide which surrounds a cavity, which is preferably stabilized with yttrium oxide or hafnium oxide, is used in a limited temperature range gas-sensitive, in particular NO x -sensitive for at least one environmentally polluting exhaust gas component. in particular NO x .
  • an ion conductor is used in the measurement of gas components.
  • the ion conductor is part of an oxygen pump.
  • the gas sensor or the oxygen pump has a membrane arranged between electrodes on an ion conductor, in particular ZrO 2 .
  • only one ion conductor is required, the electrodes of which can be produced together with a large number of "covers" on a plate which is separated after the electrodes have been produced.
  • a significant field of application for such sensors is the measurement of exhaust gas constituents.
  • the functionality of sensors is preferably protected from being affected by hot exhaust gases, in particular by arranging the sensor in a gas-permeable housing. This allows the permanent determination of NO x in exhaust gases from internal combustion engines or incinerators.
  • Inventive sensors can be mounted directly in the exhaust duct.
  • a gas-sensitive, in particular NO x -sensitiver sensor which contains an ion conductor or an oxygen pump, the outer precious metal electrode in addition to platinum according to the invention at least 20 wt .-%, in particular at least 30 wt .-% of another noble metal.
  • the other noble metal is selected from the group consisting of gold, silver, palladium, rhodium and ruthenium.
  • at least one further precious metal consists of the elements gold, silver or ruthenium.
  • the platinum content is at least 5 wt .-%, in particular 10 to 30 wt .-%.
  • a gold-based alloy with 10 to 30% by weight of platinum and 5 to 15% by weight of rhodium has proved suitable.
  • An electrochemical oxygen pump has between the atmosphere to be examined and a space separated therefrom an oxygen ion conductor which reduces gaseous oxygen at the cathode by a potential difference between two electrodes and oxidizes oxygen ions at the anode.
  • an oxygen ion conductor which reduces gaseous oxygen at the cathode by a potential difference between two electrodes and oxidizes oxygen ions at the anode.
  • the outer electrode is gas sensitive by additional noble metals in addition to platinum in certain temperature ranges for gases other than oxygen, in particular in the exhaust undesirable components, such as NO x .
  • a gas sensor is designed as a chip.
  • porous electrodes are arranged on an oxygen ion conductor substrate such as ZrO 2 , in particular in thick-film technology.
  • the oxygen conductor substrate is z. B. with Y 2 O 3 - or HfO 2 -stabilized ZrO 2 on a ceramic substrate, for. B. AI 2 O 3 adhered to its edges, z.
  • a sensitive chip for unwanted exhaust gas components is provided according to the invention, in particular for the determination of NO x .
  • the chip preferably has a heating resistor.
  • the heating resistor is arranged on an electrically insulating substrate, in particular high-purity aluminum oxide.
  • the heating resistor is preferably produced by thin-film technology.
  • the electrodes, between which the ion conductor, in particular a zirconium dioxide plate, is arranged, are produced by a known method for the production of porous electrodes, e.g. B. in thick-film technology or after special thin-film technology.
  • the chip is provided as an SMD or flip-chip component.
  • the dimensions of such a chip consisting of the electrically insulating substrate, in particular a ceramic substrate with oxygen pump arranged thereon, are less than 5 mm.
  • the cavity located between the ceramic substrate and the oxygen ion conductor is preferably less than 1 mm 3 , in particular less than 1/100 mm 3 .
  • the gas-sensitive chip has a temperature sensor.
  • Ceramic plate is spaced, has proven to be the oxygen pump of the chip.
  • the zirconium dioxide plate has on one side an electrode arranged in the cavity of noble metal, in particular platinum, and an outer electrode, which in addition to platinum has at least one further noble metal, in particular gold.
  • the base is a substrate with electrically insulating surface, such.
  • Figure 1 is a plate of alumina.
  • the plate is coated with a heating resistor, which can be applied by thin-film technology.
  • the heating resistor is arranged here outside of walls, which conclude with a cover of an ion conductor, here zirconia, and the substrate surface a space.
  • metallically conductive electrodes are arranged, of which two are designed as platinum electrodes in FIG.
  • the designated as a mixing electrode electrode consists of a noble metal alloy, which has gold and platinum.
  • the electrodes are so porous that they are permeable to oxygen. For this purpose, they are preferably applied by screen printing.
  • a plurality of zirconium flakes are co-produced by patterning a large substrate of zirconium dioxide with electrodes, to be singulated and then affixed to or between walls on the substrate.
  • the sensor can then be connected for the measurement according to FIG.
  • Figures 2 and 3 show measuring cycles relating to the electrical connections and the pressure change in the enclosed space.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Molecular Biology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Measuring Oxygen Concentration In Cells (AREA)

Abstract

Pour mesurer des composants de gaz d'échappement qui polluent l'environnement, on utilise un unique conducteur d'ions, notamment sous forme de pompe à oxygène. Pour déterminer les NOx dans des gaz d'échappement, on monte une puce capteur dans le conduit d'échappement, laquelle présente un unique conducteur d'ions pour déterminer les NOx. De préférence, la puce capteur présente une résistance chauffante et est chauffée par celle-ci. Une puce avec un conducteur chauffant et une pompe à oxygène sur son substrat est équipée d'une protection contre les gaz d'échappement. L'électrode extérieure d'une pompe à oxygène contient, outre du platine, au moins 20% en poids d'or, de rhodium, de ruthénium, de palladium ou d'argent. Sur une surface électriquement isolante d'un substrat, on dispose une structure à résistance et, à distance parallèlement à celle-ci, un conducteur d'ions qui, en tant que couvercle, ferme un espace entre le substrat et des parois latérales.
EP08837966A 2007-10-05 2008-10-02 Utilisation d'un conducteur d'ions pour un capteur de gaz Withdrawn EP2195647A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10005986A EP2226628A1 (fr) 2007-10-05 2008-10-02 Capteur de gaz
EP10006033A EP2226629A1 (fr) 2007-10-05 2008-10-02 Capteur de gaz comprenant une paillette d'électrolyte solide et trois électrodes poreuses métalliques

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007048049A DE102007048049A1 (de) 2007-10-05 2007-10-05 Verwendung eines Ionenleiters für einen Gassensor
PCT/EP2008/008343 WO2009046927A2 (fr) 2007-10-05 2008-10-02 Utilisation d'un conducteur d'ions pour un capteur de gaz

Publications (1)

Publication Number Publication Date
EP2195647A2 true EP2195647A2 (fr) 2010-06-16

Family

ID=40220230

Family Applications (3)

Application Number Title Priority Date Filing Date
EP10005986A Withdrawn EP2226628A1 (fr) 2007-10-05 2008-10-02 Capteur de gaz
EP10006033A Withdrawn EP2226629A1 (fr) 2007-10-05 2008-10-02 Capteur de gaz comprenant une paillette d'électrolyte solide et trois électrodes poreuses métalliques
EP08837966A Withdrawn EP2195647A2 (fr) 2007-10-05 2008-10-02 Utilisation d'un conducteur d'ions pour un capteur de gaz

Family Applications Before (2)

Application Number Title Priority Date Filing Date
EP10005986A Withdrawn EP2226628A1 (fr) 2007-10-05 2008-10-02 Capteur de gaz
EP10006033A Withdrawn EP2226629A1 (fr) 2007-10-05 2008-10-02 Capteur de gaz comprenant une paillette d'électrolyte solide et trois électrodes poreuses métalliques

Country Status (3)

Country Link
EP (3) EP2226628A1 (fr)
DE (1) DE102007048049A1 (fr)
WO (1) WO2009046927A2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013210903A1 (de) * 2013-06-11 2014-12-11 Heraeus Sensor Technology Gmbh Gassensor zur Messung unterschiedlicher Gase und dazugehöriges Herstellungsverfahren
DE102016210936A1 (de) * 2016-06-20 2017-12-21 Siemens Aktiengesellschaft Gassensor
DE102016115183A1 (de) * 2016-08-16 2018-02-22 Heraeus Sensor Technology Gmbh Poröses Material, Pulver zur Herstellung eines porösen Materials, Verfahren zur Herstellung eines porösen Materials und Bauteil
EP3783355A1 (fr) 2019-08-21 2021-02-24 Siemens Aktiengesellschaft Procédé et dispositif de capteur pour la détermination de la pression partielle du gaz

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0366863B1 (fr) * 1988-10-31 1994-08-31 Fujikura Ltd. Dispositif de détection d'oxygène
DE9103547U1 (de) * 1991-01-30 1992-06-04 Roth-Technik Gmbh & Co Forschung Fuer Automobil- Und Umwelttechnik, 7560 Gaggenau Vorrichtung zum kontinuierlichen Überwachen der Konzentrationen von gasförmigen Bestandteilen in Gasgemischen
KR960024356A (ko) * 1994-12-26 1996-07-20 이형도 광역공연비 센서 및 이의 구동방법
DE19651328B4 (de) * 1996-12-11 2007-07-26 Dittrich, Jürgen Gassensor
EP0938666A1 (fr) * 1997-09-15 1999-09-01 Heraeus Electro-Nite International N.V. Detecteur de gaz
JP3874947B2 (ja) * 1997-12-01 2007-01-31 日本碍子株式会社 二酸化硫黄ガスセンサ
JP3701114B2 (ja) * 1997-12-22 2005-09-28 日本碍子株式会社 ＮＯｘ分解電極の酸化防止方法
JP2000065789A (ja) * 1998-08-25 2000-03-03 Ngk Insulators Ltd 一酸化炭素センサとその作製方法及び使用方法
JP2003083936A (ja) * 2001-06-25 2003-03-19 Denso Corp ガスセンサ素子
GB2387230B (en) * 2002-02-28 2005-12-21 Ngk Spark Plug Co Prismatic ceramic heater for heating gas sensor element, prismatic gas sensor element in multi-layered structure including the prismatic ceramic heater,
DE10216724C1 (de) * 2002-04-16 2003-10-09 Bosch Gmbh Robert Verfahren zum Betreiben einer Breitband-Lamdasonde
JP4248265B2 (ja) * 2003-02-03 2009-04-02 株式会社デンソー ガスセンサ素子
DE10313064A1 (de) * 2003-03-24 2004-10-28 Webasto Thermosysteme Gmbh Gassensor und Verfahren zur Herstellung eines Gassensors
JP4511160B2 (ja) * 2003-11-27 2010-07-28 日本碍子株式会社 ガスセンサ
US7967964B2 (en) * 2007-02-27 2011-06-28 Honeywell International Inc. Single cell sensor for measuring the partial pressure of oxygen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009046927A2 *

Also Published As

Publication number Publication date
EP2226628A1 (fr) 2010-09-08
EP2226629A1 (fr) 2010-09-08
WO2009046927A3 (fr) 2009-05-28
WO2009046927A2 (fr) 2009-04-16
DE102007048049A1 (de) 2009-04-16

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Inventor name: GUTH, ULRICH

Inventor name: SCHOENAUER, ULRICH

Inventor name: DITTRICH, JUERGEN

Inventor name: ASMUS, TIM

Inventor name: ULLRICH, KARLHEINZ

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