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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage.
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Durability Improvement of Solid Electrolyte CO2 Sensor Against Humidity Variations.

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    This study introduces a novel sensing material for potentiometric carbon dioxide (CO2) sensors, significantly reducing humidity interference. The new material ensures accurate CO2 measurements even in varying humidity levels.

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    Area of Science:

    • Electrochemistry
    • Materials Science
    • Chemical Sensing

    Background:

    • Potentiometric CO2 sensors commonly use alkali/alkali-earth metal carbonates.
    • Lithium carbonate, a common sensing material, is sensitive to humidity, leading to inaccurate CO2 concentration readings.

    Purpose of the Study:

    • To develop a new sensing material for potentiometric CO2 sensors that is unaffected by humidity.
    • To improve the reliability and accuracy of CO2 sensing in diverse environmental conditions.

    Main Methods:

    • A novel sensing material composed of Li2CO3/BaCO3/LiOH/Ba(OH)2 at a 1:2:0.05:0.1 molar ratio was synthesized.
    • The electromotive force (EMF) drift of the sensor was measured across a range of relative humidity levels (25% to 70%).

    Main Results:

    • The developed sensor exhibited a minimal EMF drift of 1.5% when relative humidity changed from 25% to 70%.
    • This performance is a significant improvement compared to sensors using Li2CO3 and BaCO3, which showed a 6% drift under similar conditions.

    Conclusions:

    • The Li2CO3/BaCO3/LiOH/Ba(OH)2 composite material demonstrates excellent robustness against humidity fluctuations.
    • This new sensing material offers a promising solution for accurate and reliable potentiometric CO2 sensing in environments with variable humidity.