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    Iodine Redox-Mediated Electrolysis for Energy-Efficient Chlorine Regeneration from Gaseous HCl

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    Date
    2017-05-05
    Author
    Zhao, Yun
    Gu, Shuang
    Gong, Ke
    Zheng, Jie
    Wang, Junhua
    Yan, Yushan
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    Citation
    Zhao, Yun; Gu, Shuang; Gong, Ke; Zheng, Jie; Wang, Junhua; Yan, Yushan. 2017. Iodine Redox-Mediated Electrolysis for Energy-Efficient Chlorine Regeneration from Gaseous HCl. J. Electrochem. Soc. 2017 vol. 164:no. 7:pp E138-E143
    Abstract
    Hydrogen chloride (HCl) by-product is often produced from chlorine-consuming processes. Traditional electrochemical processes for converting HCl to chlorine (Cl-2) are completed by anodic oxidation reaction coupled with cathodic reduction reactions (two major types: hydrogen evolution reaction and oxygen reduction reaction). Herein, a triiodide (I-3(-))/ iodide (I-) redox-mediated cathode is implemented for the first time for converting HCl to Cl-2. The iodide (I-) can be converted back to triiodide (I-3(-)) by air in a reactor external to the eletrolyzer. The desirable redox potential and facile kinetics of I-3(-)/I- offer a substantially lower operational cell voltage, reducing energy consumption by 20%-25% at a typical current density of 4 kA m(-2) and improving the efficiency of Cl-2 recovery.
    Description
    This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial No Derivatives 4.0 License (CC BY-NC-ND, http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial reuse, distribution, and reproduction in any medium, provided the original work is not changed in any way and is properly cited. For permission for commercial reuse, please email: oa@electrochem.org.
    URI
    http://dx.doi.org/10.1149/2.0461707jes
    http://hdl.handle.net/10057/13613
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