Electrochemical impedance spectroscopy and finite element analysis modeling of a 4-electrode humidity sensor for natural gas transportation pipelines

Derek Hall, Timothy Duffy, Margaret Ziomek-Moroz, Serguei Lvov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Reliable corrosion monitoring of natural gas transmission lines is a major tool providing a foundation for safe management of natural gas infrastructures. Through the development of membrane-based electrochemical sensors which are able to function in low-conductivity gas environments, corrosion monitoring practices can be further strengthened by real-time monitoring of key risk factors such as relative humidity and corrosion rates of corrodible structures. In this work, we demonstrate and validate how a 4-electrode conductivity sensor can provide a means to monitor relative humidity in gases via electrochemical impedance spectroscopy through finite element analysis (FEA). For a relative humidity range of 5%-55%, the impedance response varied from 1 kΩ to 66 kΩ, showing a high sensitivity for gas humidity. To confirm that the measured impedance values reliably interpreted relative humidity, it was found that precise estimation of the sensor's cell constant was needed. FEA was used to assess how the cell constant depended on the electrode geometry, membrane geometry, and electrode placement within the sensor. Through this approach, assumptions about the characteristic area and length were validated using electrolyte equipotential and current density vector mapping. This reduced possible cell constant uncertainties by 70%. With a cell constant of 14.84 cm -1 , obtained via FEA, membrane conductivity values were in good agreement with published data.

Original languageEnglish (US)
Article number015005
JournalReview of Scientific Instruments
Volume90
Issue number1
DOIs
StatePublished - Jan 1 2019

Fingerprint

Natural gas transportation
Humidity sensors
natural gas
Electrochemical impedance spectroscopy
humidity
Atmospheric humidity
Pipelines
impedance
Finite element method
Electrodes
electrodes
sensors
corrosion
spectroscopy
membranes
cells
Membranes
Monitoring
Natural gas
Sensors

All Science Journal Classification (ASJC) codes

  • Instrumentation

Cite this

@article{ed1a13eaaab840d6a651b48c30c33d7f,
title = "Electrochemical impedance spectroscopy and finite element analysis modeling of a 4-electrode humidity sensor for natural gas transportation pipelines",
abstract = "Reliable corrosion monitoring of natural gas transmission lines is a major tool providing a foundation for safe management of natural gas infrastructures. Through the development of membrane-based electrochemical sensors which are able to function in low-conductivity gas environments, corrosion monitoring practices can be further strengthened by real-time monitoring of key risk factors such as relative humidity and corrosion rates of corrodible structures. In this work, we demonstrate and validate how a 4-electrode conductivity sensor can provide a means to monitor relative humidity in gases via electrochemical impedance spectroscopy through finite element analysis (FEA). For a relative humidity range of 5{\%}-55{\%}, the impedance response varied from 1 kΩ to 66 kΩ, showing a high sensitivity for gas humidity. To confirm that the measured impedance values reliably interpreted relative humidity, it was found that precise estimation of the sensor's cell constant was needed. FEA was used to assess how the cell constant depended on the electrode geometry, membrane geometry, and electrode placement within the sensor. Through this approach, assumptions about the characteristic area and length were validated using electrolyte equipotential and current density vector mapping. This reduced possible cell constant uncertainties by 70{\%}. With a cell constant of 14.84 cm -1 , obtained via FEA, membrane conductivity values were in good agreement with published data.",
author = "Derek Hall and Timothy Duffy and Margaret Ziomek-Moroz and Serguei Lvov",
year = "2019",
month = "1",
day = "1",
doi = "10.1063/1.5063465",
language = "English (US)",
volume = "90",
journal = "Review of Scientific Instruments",
issn = "0034-6748",
publisher = "American Institute of Physics Publising LLC",
number = "1",

}

TY - JOUR

T1 - Electrochemical impedance spectroscopy and finite element analysis modeling of a 4-electrode humidity sensor for natural gas transportation pipelines

AU - Hall, Derek

AU - Duffy, Timothy

AU - Ziomek-Moroz, Margaret

AU - Lvov, Serguei

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Reliable corrosion monitoring of natural gas transmission lines is a major tool providing a foundation for safe management of natural gas infrastructures. Through the development of membrane-based electrochemical sensors which are able to function in low-conductivity gas environments, corrosion monitoring practices can be further strengthened by real-time monitoring of key risk factors such as relative humidity and corrosion rates of corrodible structures. In this work, we demonstrate and validate how a 4-electrode conductivity sensor can provide a means to monitor relative humidity in gases via electrochemical impedance spectroscopy through finite element analysis (FEA). For a relative humidity range of 5%-55%, the impedance response varied from 1 kΩ to 66 kΩ, showing a high sensitivity for gas humidity. To confirm that the measured impedance values reliably interpreted relative humidity, it was found that precise estimation of the sensor's cell constant was needed. FEA was used to assess how the cell constant depended on the electrode geometry, membrane geometry, and electrode placement within the sensor. Through this approach, assumptions about the characteristic area and length were validated using electrolyte equipotential and current density vector mapping. This reduced possible cell constant uncertainties by 70%. With a cell constant of 14.84 cm -1 , obtained via FEA, membrane conductivity values were in good agreement with published data.

AB - Reliable corrosion monitoring of natural gas transmission lines is a major tool providing a foundation for safe management of natural gas infrastructures. Through the development of membrane-based electrochemical sensors which are able to function in low-conductivity gas environments, corrosion monitoring practices can be further strengthened by real-time monitoring of key risk factors such as relative humidity and corrosion rates of corrodible structures. In this work, we demonstrate and validate how a 4-electrode conductivity sensor can provide a means to monitor relative humidity in gases via electrochemical impedance spectroscopy through finite element analysis (FEA). For a relative humidity range of 5%-55%, the impedance response varied from 1 kΩ to 66 kΩ, showing a high sensitivity for gas humidity. To confirm that the measured impedance values reliably interpreted relative humidity, it was found that precise estimation of the sensor's cell constant was needed. FEA was used to assess how the cell constant depended on the electrode geometry, membrane geometry, and electrode placement within the sensor. Through this approach, assumptions about the characteristic area and length were validated using electrolyte equipotential and current density vector mapping. This reduced possible cell constant uncertainties by 70%. With a cell constant of 14.84 cm -1 , obtained via FEA, membrane conductivity values were in good agreement with published data.

UR - http://www.scopus.com/inward/record.url?scp=85060176161&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85060176161&partnerID=8YFLogxK

U2 - 10.1063/1.5063465

DO - 10.1063/1.5063465

M3 - Article

C2 - 30709197

AN - SCOPUS:85060176161

VL - 90

JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

SN - 0034-6748

IS - 1

M1 - 015005

ER -