Electrochemical sensor for determining CO and H 2 O content during CO conversion for hydrogen production

Anatoly S. Kalyakin; Aleksander N. Volkov

doi:10.15826/chimtech.9277

Electrochemical sensor for determining CO and H₂O content during CO conversion for hydrogen production

Anatoly S. Kalyakin, Aleksander N. Volkov

Abstract

The paper presents the results of the study on an electrochemical solid electrolyte sensor with a diffusion barrier for simultaneous measurements of carbon (II) oxide and moisture concentrations in the initial gaseous mixture for the carbon oxide conversion into hydrogen. The sensor is composed of two electrochemical cells made of commercial stabilized zirconium dioxide of the 90 mol.% ZrO₂ +10 mol.% Y₂O₃ composition. One electrochemical cell performs carbon oxide content measurements in the initial gas mixture, and another cell determines the humidity of the same gas mixture. Both electrochemical cells operate in an amperometric mode. We obtained dependences of the limiting sensor current both on the carbon oxide and on the moisture concentrations in the gas mixture, as well as the temperature dependences of the limiting currents within the range of 650–750 ^оС. The sensor dynamic characteristics for the measurement of carbon oxide concentration and moisture at the temperature of 700 ^оС were obtained. The sensor possesses a satisfactory determination rate and high reproducibility at the operating temperature of 700 ^oС.

Keywords

carbon oxide; humidity; diffusion barrier; electrochemical cell; limiting diffusion current; solid electrolyte

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DOI: https://doi.org/10.15826/chimtech.9277

Copyright (c) 2025 Anatoly S. Kalyakin, Aleksander N. Volkov

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Chimica Techno Acta, 2014–2025
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