Encyclopedia of Applied Electrochemistry

2014 Edition
| Editors: Gerhard Kreysa, Ken-ichiro Ota, Robert F. Savinell

High-Temperature CO2 Electrolysis

  • Mogens Bjerg MogensenEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-6996-5_463


High temperature is here defined as temperatures of 500 °C or higher. There are three different electrochemical cells that can be used for CO 2 electrolysis, and there are three main arguments in favor of high-temperature electrolysis of CO 2 into CO or CH 4, and O 2. Details and electrochemical reactions are given below.

Cell Types:

  1. 1.

    Solid oxide electrolyzer cells (SOEC) have a solid oxide ion conductor as electrolyte, often yttria-stabilized zirconia (YSZ). The cathode (CO evolution, negative) is often a Ni-YSZ composite called a cermet. The anode (O2 evolution, positive) most often consists of a composite of YSZ electrolyte and an electron-conducting perovskite-structured oxide, e.g., (La0.75Sr0.25)0.95MnO3 [1].

  2. 2.

    Solid proton-conducting electrolyzer cell (SPCEC) has a proton-conducting solid oxide electrolyte, e.g., yttria-doped barium zirconate, BaZr0.85Y0.15H0.15O3, i.e., ceramics that can take up H2O and become proton conducting [2]. Electrodes may be similar to...

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© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Energy Conversion and Storage, Technical University of DenmarkRoskildeDenmark