Influences of water vapor on NASICON-based CO2 sensor operative at room temperature

Kenji Obata; Kengo Shimanoe; Norio Miura; Noboru Yamazoe

doi:10.1016/S0925-4005(03)00177-1

Influences of water vapor on NASICON-based CO₂ sensor operative at room temperature

Kenji Obata, Kengo Shimanoe, Norio Miura, Noboru Yamazoe

Functional Materials Science

Research output: Contribution to journal › Conference article › peer-review

16 Citations (Scopus)

Abstract

Electrochemical CO₂ sensors were fabricated with NASICON (Na₃Zr₂Si₂PO₁₂) disks containing different levels of Na₃PO₄. The marked differences of the effect of aging in humid condition revealed that the auxiliary phase (NaHCO₃ and/or Na₂CO₃) was formed spontaneously from the Na₃PO₄ impurity of NASICON in the presence of water vapor and CO₂. Even when the auxiliary phase was formed or intentionally added, CO₂ sensing properties were easily lost completely under exposure to dry atmosphere, indicating active involvement of water vapor in the CO₂ sensing electrode reactions. EMF versus CO₂ concentration correlations usually tended to shift up with increasing relative humidity. Remarkably, this shift was reduced effectively by introducing Li₂CO₃ as an auxiliary phase, suggesting that the shift originates from the instability of NaHCO₃ and/or Na₂CO₃ in humid atmosphere.

Original language	English
Pages (from-to)	243-249
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	93
Issue number	1-3
DOIs	https://doi.org/10.1016/S0925-4005(03)00177-1
Publication status	Published - Aug 1 2003
Event	Proceedings of the Ninth International Meeting on Chemical Engineering - Boston, MA, United States Duration: Jul 7 2003 → Jul 10 2003

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering
Materials Chemistry

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10.1016/S0925-4005(03)00177-1

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title = "Influences of water vapor on NASICON-based CO2 sensor operative at room temperature",

abstract = "Electrochemical CO2 sensors were fabricated with NASICON (Na3Zr2Si2PO12) disks containing different levels of Na3PO4. The marked differences of the effect of aging in humid condition revealed that the auxiliary phase (NaHCO3 and/or Na2CO3) was formed spontaneously from the Na3PO4 impurity of NASICON in the presence of water vapor and CO2. Even when the auxiliary phase was formed or intentionally added, CO2 sensing properties were easily lost completely under exposure to dry atmosphere, indicating active involvement of water vapor in the CO2 sensing electrode reactions. EMF versus CO2 concentration correlations usually tended to shift up with increasing relative humidity. Remarkably, this shift was reduced effectively by introducing Li2CO3 as an auxiliary phase, suggesting that the shift originates from the instability of NaHCO3 and/or Na2CO3 in humid atmosphere.",

author = "Kenji Obata and Kengo Shimanoe and Norio Miura and Noboru Yamazoe",

note = "Funding Information: This study was partially supported by a Grant-in-Aid for Scientific Research from The Ministry of Education, Culture, Sport, Science and Technology of Japan. ; Proceedings of the Ninth International Meeting on Chemical Engineering ; Conference date: 07-07-2003 Through 10-07-2003",

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TY - JOUR

T1 - Influences of water vapor on NASICON-based CO2 sensor operative at room temperature

AU - Obata, Kenji

AU - Shimanoe, Kengo

AU - Miura, Norio

AU - Yamazoe, Noboru

N1 - Funding Information: This study was partially supported by a Grant-in-Aid for Scientific Research from The Ministry of Education, Culture, Sport, Science and Technology of Japan.

PY - 2003/8/1

Y1 - 2003/8/1

N2 - Electrochemical CO2 sensors were fabricated with NASICON (Na3Zr2Si2PO12) disks containing different levels of Na3PO4. The marked differences of the effect of aging in humid condition revealed that the auxiliary phase (NaHCO3 and/or Na2CO3) was formed spontaneously from the Na3PO4 impurity of NASICON in the presence of water vapor and CO2. Even when the auxiliary phase was formed or intentionally added, CO2 sensing properties were easily lost completely under exposure to dry atmosphere, indicating active involvement of water vapor in the CO2 sensing electrode reactions. EMF versus CO2 concentration correlations usually tended to shift up with increasing relative humidity. Remarkably, this shift was reduced effectively by introducing Li2CO3 as an auxiliary phase, suggesting that the shift originates from the instability of NaHCO3 and/or Na2CO3 in humid atmosphere.

AB - Electrochemical CO2 sensors were fabricated with NASICON (Na3Zr2Si2PO12) disks containing different levels of Na3PO4. The marked differences of the effect of aging in humid condition revealed that the auxiliary phase (NaHCO3 and/or Na2CO3) was formed spontaneously from the Na3PO4 impurity of NASICON in the presence of water vapor and CO2. Even when the auxiliary phase was formed or intentionally added, CO2 sensing properties were easily lost completely under exposure to dry atmosphere, indicating active involvement of water vapor in the CO2 sensing electrode reactions. EMF versus CO2 concentration correlations usually tended to shift up with increasing relative humidity. Remarkably, this shift was reduced effectively by introducing Li2CO3 as an auxiliary phase, suggesting that the shift originates from the instability of NaHCO3 and/or Na2CO3 in humid atmosphere.

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DO - 10.1016/S0925-4005(03)00177-1

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SN - 0925-4005

VL - 93

SP - 243

EP - 249

JO - Sensors and Actuators, B: Chemical

JF - Sensors and Actuators, B: Chemical

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T2 - Proceedings of the Ninth International Meeting on Chemical Engineering

Y2 - 7 July 2003 through 10 July 2003

ER -

Influences of water vapor on NASICON-based CO₂ sensor operative at room temperature

Abstract

All Science Journal Classification (ASJC) codes

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