Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Co-Precipitation Synthesis and Characterization of Strontium Lanthanum Vanadate Nanoparticles

  • Thanh-Nam, Huynh (Graduate school of Materials Science and Engineering Chungnam National University) ;
  • Nersisyan, Hayk Hacob (Rapidly Solidified Materials Research Center, Chungnam National University) ;
  • Hong, Soon-Jik (Division of Advanced Materials Engineering, Kongju National University) ;
  • Lee, Jong-Hyeon (Graduate school of Materials Science and Engineering Chungnam National University)
  • Received : 2021.03.11
  • Accepted : 2021.03.24
  • Published : 2021.04.27
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Abstract

Strontium lanthanum vanadate La1-xSrxVO3 (LSVO) is a promising anode material for electrochemical devices, especially for solid oxide fuel cells, thanks to its irregular electrical conductivity. However, the known synthesis methods are incapable of producing well-dispersed LSVO nanoparticles (NPs) with homogeneous size distribution, which partly impedes the applicability of the material. Thus, a new approach to synthesize LSVO NPs with such characteristics is of paramount importance. In the present work, we successfully prepare LSVO NPs with a high dispersion degree and homogeneous size distribution via a modified co-precipitation pathway, followed by hydrogen reduction at a temperature as low as 700 ℃. The prepared LSVO NPs display uniform sizes in the range of 50 ~ 100 nm and do not contain any secondary phases, according to XRD analysis. The chemical mechanism of reactions that occur to form the LSVO is thoroughly highlighted. The work functions of NPs measured by the UPS analysis are in the 2.13 ~ 3.62 eV range, making the LSVO powders promising for use in thermionic devices. An explanation of the role of Sr substitution in work function values of LSVO is also proposed.

Keywords

Acknowledgement

This work was supported by the Basic Research Laboratory Program through the Ministry of Education of the Republic of Korea (2019R1A4A1026125).

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