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Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
What is the advantages of SOFC(H+) as compared with SOFC(O2-)
What is the advantages of SOFC(H+) as compared with SOFC(O2-)
What problems has SOFC(H+)
What problems has SOFC(H+)
Influence of electron transfer number on EMF
Influence of electron transfer number on EMF
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Solid oxide devices based on proton-conducting electrolytes: prospects and problems

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1Solid oxide devices based on 7Sofc(н+). Co-flow mode. H2. H2. Anode
proton-conducting electrolytes: prospects space. H2O. H2O. e-. e-. Air. Air depleted
and problems. Panagiotis Tsiakaras1,2 and with O2. Cathode space. Anode. Load. O2-.
Anatoly Demin1 1Institute of Cathode.
High-Temperature Electrochemistry, 8SOFC efficiency. The most important
Yekaterinburg, Russia Laboratory of characteristics of a power source is its
electrochemical devices based on solid efficiency: the higher efficiency, the
oxide proton-conducting electrolytes 2 less fuel is consumed, the less wastes are
University of Thessaly, Volos, Greece. produced. Power produced by the SOFC is
2What is solid electrolyte? Solid electrical energy: А = qu. Spent energy in
material in which there is possibility for the SOFC is chemical energy of fuel:
ions’ movement without destroy of its –?Н298. is fuel utilization. is
structure. What is solid oxide thermo-neutral voltage.
electrolyte? Solid oxide or solid oxide 9What is the advantages of SOFC(H+) as
composition in which there is possibility compared with SOFC(O2-). Higher EMF Higher
for oxygen ions or protons movement. There fuel utilization. 0,99 in SOFC(H+) less
are a lot of solid materials with than 0,9 in SOFC(O2-) (usually 0,75-0,8).
conductivity by cations and anions. An average EMF in SOFC(H+) by 10% higher
3Necessary conditions for oxygen than that in SOFC(O2-). Fuel utilization
conductivity in solid oxides. 2-D model of in SOFC(H+) at least by 10% higher than
a crystal of АО2 oxide. that in SOFC(O2-). So, SOFC(H+) efficiency
42-D model of a solid solutions АО2 + at least by 20% higher than SOFC(O2-)
ВО. A part of АО2 molecules is substituted efficiency.
by ВО molecules. Some positions in an 10What problems has SOFC(H+). Some
anion sublattice are empty (vacancies). electrolytes seem to have not only ionic
Oxygen ions can jump from normal position conductivity, but also electronic one. The
to an empty one. 4+. 2+. 4+. 2+. evidence of this is lower OCV. Emeasured =
5Ивтэ. Proton conductivity in solid ti?E.
oxides. Protons are not intrinsic 11Influence of electron transfer number
components of the oxide crystal. Necessary on EMF. ti = 1 ti = 0,9.
conditions for proton conductivity in 12The main task is to find the
solid oxides. 1. The oxide must contain electrolytes with highest protonic
vacancies. 2. Gas phase must contain conductivity and develop the technology
steam. Protons can jump from one oxygen for producing gas-tight electrolytes. Such
ion to the neighbor one. electrolytes can be also the base for
6Solid oxide electrolyte cell based on. other electrochemical devices, namely
?H. ?O. H+. O2-. E. oxygen ion solid oxide electrolyzers for producing
electrolyte. proton conducting high purity H2; sensors for analyzing
electrolyte. E. Bound О2 (Н2+H2O). Free hydrogen-containing gas mixtures; devices
Н2. Bound Н2 (H2O+О2). Free О2. E stands for measuring diffusion coefficient of
for electromotive force (also called “open hydrogen in different gas mixtures.
circuit voltage”, OCV). 13Thank you for your attention!
7Processes in SOFC. SOFC(O2-).
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Solid oxide devices based on proton-conducting electrolytes: prospects and problems

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