Torben Jacobsen
University of Copenhagen
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213th ECS Meeting | 2008
Mogens Bjerg Mogensen; Torben Jacobsen
Solid oxide fuel cells and electrolyzers are usually based on yttrium stabilized zirconia (YSZ) as electrolyte. Although the transport number of oxide ions in YSZ at normal conditions is not below 0.999 the electron and hole conductivity may be of practical importance. In long term operation it may cause oxygen pressure to build up in closed cavities inside the electrolyte. Fundamental concepts as electric and electrochemical potential are discussed, and revive the concept electromotive potential originally introduced by Bronsted. This potential is equivalent to the Fermi level and is useful in the discussion of electronic conduction in mixed conductors. On the bases of a solution to the transport equations for oxide ions, electrons and holes, potential profiles across the cell are calculated for fuel cell and electrolyzer applications. One main result of the analysis is the verification that in steady state operation, the oxygen pressure inside a cavity can never exceed the value corresponding to the electrode potential.
10th International Symposium on Solid Oxide Fuel Cells (SOFC-X) | 2007
Mogens Bjerg Mogensen; Jens Ho̸gh; Karin Vels Hansen; Torben Jacobsen
Various models of the H2/H2O/Ni/SZ (SZ = stabilized zirconia) electrode kinetics have been presented in the literature in order to explain the reported experimental data. However, there has been a strong tendency of using a limited set of data to “verify” a given model, disregarding other data sets, which do not fit the model. We have inspected some models in the literature, and problems (e.g. no quantitative model has explained the large variation in reported values of apparent activation energy of the electrode kinetics) as well as strengths of the models are discussed. We point out experimental findings that a useful model must be able to explain such as difference in sensitivity to poisoning by H2S due to differences in the detailed composition of the SZ and large change in apparent activation energy by change in cermet preparation. Finally, we will point out some elements, which seem important for any realistic and useful mathematical model of the H2/H2O/Ni/SZ electrode.
13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII) | 2013
Yuehua Wu; Karin Vels Hansen; Kion Norrman; Torben Jacobsen; Mogens Bjerg Mogensen
Archive | 2006
Trine Klemensø; Mogens Bjerg Mogensen; Torben Jacobsen
7th European Solid Oxide Fuel Cell Forum | 2006
Mogens Bjerg Mogensen; Søren Højgaard Jensen; Anne Hauch; Ib Chorkendorff; Torben Jacobsen
7th European Solid Oxide Fuel Cell Forum | 2006
Martin Søgaard; Peter Vang Hendriksen; Torben Jacobsen; Mogens Bjerg Mogensen
Electrochemical Society. Meeting Abstracts (Online) | 2014
Torben Jacobsen; Christodoulos Chatzichristodoulou; Mogens Bjerg Mogensen
213th ECS Meeting | 2008
So̸ren H. Jensen; Peter Vang Hendriksen; Mogens Bjerg Mogensen; Torben Jacobsen
Electrochemical Society. Meeting Abstracts (Online) | 2017
Simon Pitscheider; Michael L. Machala; Zixuan Guan; Di Chen; Johan Hjelm; Torben Jacobsen; William C. Chueh; Mogens Bjerg Mogensen; Christodoulos Chatzichristodoulou
232nd ECS meeting | 2017
Kosova Kreka; Karin Vels Hansen; Torben Jacobsen; Kion Norrman; Christodoulos Chatzichristodoulou; Mogens Bjerg Mogensen