Solid oxide fuel cells oxygen reduction

Electrode for electrochemical oxidation reactions. In solid oxide fuel cells, hydrogen-containing fuels are oxidized by oxygen ions transported through an electrolyte to form water vapor or CO2 as the reaction products at this electrode. SOFC anodes may also act as fuel reforming catalysts when hydrocarbon-based fuels are supplied to the anodes. Electrode for electrochemical reduction reactions. In solid oxide fuel cells, oxygen in ambient air is reduced to oxygen ions at this electrode. 

Factors Governing Oxygen Reduction in Solid Oxide Fuel Cell Cathodes Stuart B. Adler... 

The literature reviewed in sections 2—6 represents significant advances made in the last 20 years in our understanding of solid oxide fuel-cell cathodes. At the same time, however, this work has also underscored how complex the oxygen reduction reaction is, mak-... 

Fig. 13.27. Potential vs. current density plots for state-of-the-art fuel cells, o, proton exchange membrane fuel cell , solid oxide fuel cell , pressurized phosphonic acid fuel cell (PAFC) a, direct methanol fuel cell, direct methanol PAFC , alkaline fuel cell. (Reprinted from M. A. Parthasarathy, S. Srinivasan, and A. J. Appleby, Electrode Kinetics of Oxygen Reduction at Carbon-Supported and Un-supported Platinum Microcrystal-lite/Nafion Interfaces, J. Electroanalytical Chem. 339 101-121, copyright 1992, p. 103, Fig. 1, with permission from Elsevier Science.)...

Fig. 5. (a) Working principle of a solid oxide fuel cell, (b) Sketch of possible reaction paths of the oxygen reduction reaction, taking place on a particle of a solid oxide fuel cell cathode. 

Solid oxide fuel cells (SOFC), which use oxygen conducting ceramic membranes to electo-combust H2, at the anode, by 02 -anions provided by the cathodic reduction of ambient oxygen at high temperatures. 

Choi, Y., Mebane, D.S., Wang, J.H., Liu, M. Continuum and quantum-chemical modeling of oxygen reduction on the cathode in a solid oxide fuel cell. Top. Catal. 2007, 46, 386-401. 

Choi, Y., Lin, M.C., Liu, M.L. Computational study on the catalytic mechanism of oxygen reduction on La0,5Sro.5Mn03 in solid oxide fuel cells. Angew. Chem. Int. Ed. 2007, 46, 7214-9. 

There exist a variety of fuel cells. For practical reasons, fuel cells are classified by the type of electrolyte employed. The following names and abbreviations are frequently used in publications alkaline fuel cells (AFC), molten carbonate fuel cells (MCFC), phosphoric acid fuel cells (PAFC), solid oxide fuel cells (SOFC), and proton exchange membrane fuel cells (PEMFC). Among different types of fuel cells under development today, the PEMFC, also called polymer electrolyte membrane fuel cells (PEFC), is considered as a potential future power source due to its unique characteristics [1-3]. The PEMFC consists of an anode where hydrogen oxidation takes place, a cathode where oxygen reduction occurs, and an electrolyte membrane that permits the transfer of protons from anode to cathode. PEMFC operates at low temperature that allows rapid start-up. Furthermore, with the absence of corrosive cell constituents, the use of the exotic materials required in other fuel cell types is not required [4]. 

Co, A.C. and Birss, V.I. (2006) Mechanistic analysis of the oxygen reduction reaction at (La, SrjMnOs cathodes in solid oxide fuel cells. J. Phys. Chem. B, 110 (23), 11299-11309. 

Solid oxide fuel cells (SOFCs), typically based on an oxide ion conducting electrolyte as previously discussed in earlier chapters, have a fundamental requirement for the high-temperature reduction of the oxidizing species. In general this reaction is viewed as the simple oxygen reduction reaction, as summarized in Eq. 1 ... 

Adler SB (2004) Factors governing oxygen reduction in solid oxide fuel cell cathodes. Chem Rev 104 4791 844. doi 10.1021/cr020724o... 

---