Novel Proton-Conducting Nanocomposites for Hydrogen Separation Membranes - Доклады на конференциях | Sciact - CRIS-система Института катализа

Novel Proton-Conducting Nanocomposites for Hydrogen Separation Membranes Доклады на конференциях

Язык

Английский

Тип доклада

Устный

Конференция

21 International Conference on Solid State Ionics
18-23 июн. 2017 , Padua

Авторы

Sadykov Vladislav ¹ , Bespalko Yulia ¹ , Krasnov Alexey ¹ , Skryabin Pavel ¹ , Sadovskaya Ekaterina ^1,2 , Eremeev Nikita ¹ , Krieger Tamara ^1,2 , Belyaev Vladimir ¹ , Vinokurov Zakhar ^1,3 , Uvarov Nikolai ^4,5 , Ulikhin Artyom ⁴

Организации

1	Институт катализа им. Г.К. Борескова СО РАН
2	Новосибирский национальный исследовательский государственный университет
3	Институт ядерной физики имени Г.И. Будкера СО РАН
4	Институт химии твердого тела и механохимии СО РАН
5	Новосибирский государственный технический университет

Design of oxide and nanocomposite materials with high mixed protonic-electronic conductivity such as lanthanide niobates and tungstates [1] is encouraging approach in developing hydrogen separation membranes. This work aims at elucidating the relations between the composition, structure, oxygen and protonic mobility of such materials. La0.99Ca0.01NbO4, LaNb3O9 and Nd5.5(Mo,W)O11.25 σ were synthesized by Pechini route [2]. Nanocomposites of tungstates with LaNb3O9 and Ni+Cu were prepared by US dispersion or mechanical treatment in a high energy mill, then sintered using conventional thermal sintering and hot pressing. All obtained materials were characterized using XRD, TEM with EDX analysis, IR and Raman spectroscopy. For powdered samples the oxygen and protonic mobility were studied by isotope exchange with CO182 and D2O, respectively. For sintered pellets the unit cell volume and weight relaxation techniques were applied to estimate the oxygen and water chemical diffusion coefficients. The protonic conductivity was studied by Van der Pauw technique. The main phases were scheelite for La0.99Ca0.01NbO4, perovskite for LaNb3O9 and fluorite for Nd5.5(Mo,W)O11.25 σ. Extended bulk/surface defects were observed by TEM agreeing with IR and Raman spectroscopy data. The oxygen mobility studies revealed two routes of bulk oxygen diffusion related to two phases in nanocomposites. . H2O desorption experiments revealed the working temperature range being 300 – 450 °C. The protonic conductivity values (~ 10 4 Ω 1cm 1 at 400 °C) agree with the literature data [3] and are enough high for practical application. Proton tracer and chemical diffusion coefficients values are ~10 11 and ~10 5 cm2/s at working temperatures respectively. Acknowledgements The work was supported by the Russian Science Foundation (Project 16-13-00112).

Sadykov V. , Bespalko Y. , Krasnov A. , Skryabin P. , Sadovskaya E. , Eremeev N. , Krieger T. , Belyaev V. , Vinokurov Z. , Uvarov N. , Ulikhin A.
Novel Proton-Conducting Nanocomposites for Hydrogen Separation Membranes
21 International Conference on Solid State Ionics 18-23 Jun 2017