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Solid oxide devices based on proton-conducting electrolytes: prospects
Solid oxide devices based on proton-conducting electrolytes: prospects
What is solid electrolyte
What is solid electrolyte
Necessary conditions for oxygen conductivity in solid oxides
Necessary conditions for oxygen conductivity in solid oxides
2-D model of a solid solutions АО2 + ВО
2-D model of a solid solutions АО2 + ВО
Ивтэ
Ивтэ
Solid oxide electrolyte cell based on
Solid oxide electrolyte cell based on
Processes in SOFC
Processes in SOFC
SOFC efficiency
SOFC efficiency
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
The main task is to find the electrolytes with highest protonic
The main task is to find the electrolytes with highest protonic
Thank you for your attention
Thank you for your attention

Презентация на тему: «Solid oxide devices based on proton-conducting electrolytes: prospects and problems». Автор: NewUserT. Файл: «Solid oxide devices based on proton-conducting electrolytes: prospects and problems.ppt». Размер zip-архива: 396 КБ.

Solid oxide devices based on proton-conducting electrolytes: prospects and problems

содержание презентации «Solid oxide devices based on proton-conducting electrolytes: prospects and problems.ppt»
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1 Solid oxide devices based on proton-conducting electrolytes: prospects

Solid oxide devices based on proton-conducting electrolytes: prospects

and problems

Panagiotis Tsiakaras1,2 and Anatoly Demin1 1Institute of High-Temperature Electrochemistry, Yekaterinburg, Russia Laboratory of electrochemical devices based on solid oxide proton-conducting electrolytes 2 University of Thessaly, Volos, Greece

2 What is solid electrolyte

What is solid electrolyte

Solid material in which there is possibility for ions’ movement without destroy of its structure

What is solid oxide electrolyte?

Solid oxide or solid oxide composition in which there is possibility for oxygen ions or protons movement

There are a lot of solid materials with conductivity by cations and anions.

3 Necessary conditions for oxygen conductivity in solid oxides

Necessary conditions for oxygen conductivity in solid oxides

2-D model of a crystal of АО2 oxide

4 2-D model of a solid solutions АО2 + ВО

2-D model of a solid solutions АО2 + ВО

A part of АО2 molecules is substituted by ВО molecules

Some positions in an anion sublattice are empty (vacancies).

Oxygen ions can jump from normal position to an empty one.

4+

2+

4+

2+

5 Ивтэ

Ивтэ

Proton conductivity in solid oxides

Protons are not intrinsic components of the oxide crystal.

Necessary conditions for proton conductivity in solid oxides

1. The oxide must contain vacancies

2. Gas phase must contain steam.

Protons can jump from one oxygen ion to the neighbor one.

6 Solid oxide electrolyte cell based on

Solid oxide electrolyte cell based on

?H

?O

H+

O2-

E

oxygen ion electrolyte

proton conducting electrolyte

E

Bound О2 (Н2+H2O)

Free Н2

Bound Н2 (H2O+О2)

Free О2

E stands for electromotive force (also called “open circuit voltage”, OCV)

7 Processes in SOFC

Processes in SOFC

SOFC(O2-)

Sofc(н+)

Co-flow mode

H2

H2

Anode space

H2O

H2O

e-

e-

Air

Air depleted with O2

Cathode space

Anode

Load

O2-

Cathode

8 SOFC efficiency

SOFC efficiency

The most important characteristics of a power source is its efficiency: the higher efficiency, the less fuel is consumed, the less wastes are produced

Power produced by the SOFC is electrical energy: А = qu

Spent energy in the SOFC is chemical energy of fuel: –?Н298

is fuel utilization

is thermo-neutral voltage

9 What is the advantages of SOFC(H+) as compared with SOFC(O2-)

What is the advantages of SOFC(H+) as compared with SOFC(O2-)

Higher EMF Higher fuel utilization

0,99 in SOFC(H+) less than 0,9 in SOFC(O2-) (usually 0,75-0,8)

An average EMF in SOFC(H+) by 10% higher than that in SOFC(O2-). Fuel utilization in SOFC(H+) at least by 10% higher than that in SOFC(O2-). So, SOFC(H+) efficiency at least by 20% higher than SOFC(O2-) efficiency

10 What problems has SOFC(H+)

What problems has SOFC(H+)

Some electrolytes seem to have not only ionic conductivity, but also electronic one. The evidence of this is lower OCV. Emeasured = ti?E

11 Influence of electron transfer number on EMF

Influence of electron transfer number on EMF

ti = 1 ti = 0,9

12 The main task is to find the electrolytes with highest protonic

The main task is to find the electrolytes with highest protonic

conductivity and develop the technology for producing gas-tight electrolytes. Such electrolytes can be also the base for other electrochemical devices, namely solid oxide electrolyzers for producing high purity H2; sensors for analyzing hydrogen-containing gas mixtures; devices for measuring diffusion coefficient of hydrogen in different gas mixtures.

13 Thank you for your attention

Thank you for your attention

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