Formation of the metal-oxide nanocomposites during the partial reduction of Nd-Sr nickelates
S. A. Malyshev,
O. A. Shlyakhtin,
G. M. Timofeev,
G. N. Mazo,
I. V. Roslyakov,
A. V. Vasiliev,
T. B. Shatalova,
A. L. Kustov https://doi.org/10.17586/2220-8054-2023-14-6-672-678
Abstract
A thermal reduction of Nd2-xSrxNiO4 (x = 0–1.4) solid solutions in an Ar/H2 gas mixture occurs in several separate stages. The initial stages of reduction presumably related to the reduction of Ni3+ to Ni2+ cause only minor changes in the initial K2NiF4 type structure and retain the morphology of the complex oxide particles. Occasionally, this process is accompanied by the appearance of Ni metal nanoparticles at the surface of oxide grains. As-obtained Ni/metal oxide nanocomposites similar to the products of redox exsolution demonstrate noticeable catalytic activity in the reaction of CO2 hydrogenation at T = 350–400C.
Keywords
Supporting agencies: This study is supported by the Russian Science Foundation (grant 22-23-00460). The Moscow State University program of development is gratefully acknowledged for the partial support of instrumental studies. SEM images were obtained at the IGIC RAS Joint Research Center for Physical Methods of Research.
About the Authors
S. A. Malyshev
Department of Chemistry, M. V. Lomonosov Moscow State University
China
China
Sergey A. Malyshev - Department of Chemistry
119991 Moscow
O. A. Shlyakhtin
Department of Chemistry, M. V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Oleg A. Shlyakhtin - Department of Chemistry
119991 Moscow
G. M. Timofeev
Department of Chemistry, M. V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Grigorii M. Timofeev - Department of Chemistry
119991 Moscow
G. N. Mazo
Department of Chemistry, M. V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Galina N. Mazo - Department of Chemistry
119991 Moscow
I. V. Roslyakov
Department of Materials Sciences, M. V. Lomonosov Moscow State University; N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Ilya V. Roslyakov
119991 Moscow
A. V. Vasiliev
Department of Chemistry, M. V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Aleksander V. Vasiliev - Department of Chemistry
119991 Moscow
T. B. Shatalova
Department of Chemistry, M. V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Tatiana B. Shatalova – Department of Chemistry
119991 Moscow
A. L. Kustov
Department of Chemistry, M. V. Lomonosov Moscow State University
Russian Federation
Russian Federation
Aleksander L. Kustov – Department of Chemistry
119991 Moscow
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Malyshev S.A., Shlyakhtin O.A., Timofeev G.M., Mazo G.N., Roslyakov I.V., Vasiliev A.V., Shatalova T.B., Kustov A.L. Formation of the metal-oxide nanocomposites during the partial reduction of Nd-Sr nickelates. Nanosystems: Physics, Chemistry, Mathematics. 2023;14(6):672-678. https://doi.org/10.17586/2220-8054-2023-14-6-672-678
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