Synthesis and Physicochemical Characterization of Solid Oxide Electrolyte and Electrode Materials for Medium Temperature Fuel Cells

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

Finely dispersed СeO2–Nd2O3 and Gd2O3–La2O3–SrO–Ni(Co)2O3–δ mesoporous powders are synthesized by co-crystallization of the corresponding nitrates solutions with ultrasonic treatment and used to prepare nanoceramic materials with a fluorite-like, orthorhombic perovskite and tetragonal perovskite crystal structures respectively with CSR ~ 55–90 нм (1300ºC). The study of physicochemical properties of the obtained ceramic materials revealed an open porosity 7–11% for СeO2–Nd2O3 and 17–42% for Gd2O3–La2O3–SrO–Ni(Co)2O3–ä. Cerium oxide-based materials possess a predominantly ionic electrical conductivity with σ700ºС = 0.31 · 10–2 S/cm (ion transfer number ti = 0.71–0.89 in the temperature range 300–700°C) due to the formation of mobile oxygen vacancies at heterovalent substitution of Nd3+ for Се4+. Solid solutions based on lanthanum nickelate and cobaltite feature a mixed electronic-ionic conductivity with σ700°С = 0.59 ∙ 10–1 S/cm with the electron and ion transfer numbers te = 0.92–0.99 and ti = 0.08–0.01. The obtained ceramic materials are shown to be promising as solid oxide electrolyrtes and electrodes for medium temperature fuel cells.

Толық мәтін

Рұқсат жабық

Авторлар туралы

M. Kalinina

Institute of Silicate Chemistry of Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: tikhonov_p-a@mail.ru
Ресей, Saint Petersburg

I. Polyakova

Institute of Silicate Chemistry of Russian Academy of Sciences

Email: tikhonov_p-a@mail.ru
Ресей, Saint Petersburg

S. Mjakin

Saint Petersburg State Institute of Technology; Institute for Analytical Instrumentation of Russian Academy of Sciences

Email: tikhonov_p-a@mail.ru
Ресей, Saint Petersburg; Saint Petersburg

T. Khamova

Institute of Silicate Chemistry of Russian Academy of Sciences

Email: tikhonov_p-a@mail.ru
Ресей, Saint Petersburg

L. Efimova

Institute of Silicate Chemistry of Russian Academy of Sciences

Email: tikhonov_p-a@mail.ru
Ресей, Saint Petersburg

I. Kruchinina

Institute of Silicate Chemistry of Russian Academy of Sciences; LETI Saint Petersburg Electrotechnical University

Email: tikhonov_p-a@mail.ru
Ресей, Saint Petersburg; Saint Petersburg

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2. Fig. 1. Results of differential thermal analysis of nanopowder of Gd0.4Sr0.1Co0.5O3 composition obtained by co-crystallization of salts.

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3. Fig. 2. X-ray diffraction patterns of nanopowder (1, 600С) and ceramic sample (2, 1300С) of composition (CeO2)0.85(Nd2O3)0.15 synthesized by co-crystallization of cerium and neodymium salts.

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4. Fig. 3. X-ray diffraction patterns of nanopowder and ceramics of composition Gd0.25Sr0.25Co0.5O3- δ treated at 900 (1) and 1200С (2).

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5. Fig. 4. Microphotographs of ceramics of composition Gd0.25Sr0.25Co0.5O3- after firing at 1200С at magnification of 240× (a) and 2000× (b).

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6. Fig. 5. Temperature dependences of specific electrical conductivity of ceramic samples with ZnO sintering additive of composition (CeO2)1-x(Nd2O3)x, where x = 0.15 (1); 0.10 (2); 0.20 (3); 0.05 (4); 0.25 (5).

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7. Fig. 6. Temperature dependences of specific electrical conductivity of ceramic samples of composition Gd0.25Sr0.25Co0.5O3-δ (1), Gd0.4Sr0.1Co0.5O3-δ with complex additive (2), Gd0.25Sr0.25Co0.5O3-δ without additive (3).

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