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ISSN : 1225-0562(Print)
ISSN : 2287-7258(Online)
Korean Journal of Materials Research Vol.31 No.4 pp.209-218
DOI : https://doi.org/10.3740/MRSK.2021.31.4.209

Co-Precipitation Synthesis and Characterization of Strontium Lanthanum Vanadate Nanoparticles

Huynh Thanh-Nam1, Hayk Hacob Nersisyan2, Soon-Jik Hong3, Jong-Hyeon Lee1,2,4†
1Graduate school of Materials Science and Engineering Chungnam National University, Daejeon, Republic of Korea
2Rapidly Solidified Materials Research Center, Chungnam National University, Daejeon, Republic of Korea
3Division of Advanced Materials Engineering, Kongju National University, Cheonan, Chungnam, Republic of Korea
4Graduate school of Energy Science and Technology, Chungnam National University, Daejeon, Republic of Korea

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 oC. 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.

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