A位掺杂Ru对SPS制备LaCrO3陶瓷导电性的影响及其作为熔盐中惰性阳极的可行性

Translated title of the contribution: Influence of Ru doping on the conductivity of LaCrO3 ceramic prepared by SPS and the feasibility of the doped ceramic for an inert anode of molten salt electrolysis

Han Dong Jiao*, Ming Yong Wang, Wei Li Song, Shu Qiang Jiao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

LaCrO3 ceramic is a promising function material in areas such as high temperature piezoelectric materials and solid oxide fuel cells (SOFC). However, its practical applications are limited by fatal flaws including their low density and poor conductivity. To address these challenges, spark plasma sintering (SPS) was used to prepare the high-density LaCrO3 ceramic. Additionally, Ru, a multivalent metallic element, was doped in the A site of the LaCrO3 ceramic to investigate the conductivity of the La1− x Ru x CrO3 ( x =0−0.25). X-ray power diffraction (XRD) results and scanning electron microscope images show that the sintered La1− x Ru x CrO3 ceramic has a single perovskite phase and high density. The characteristic peak shifting observed in the XRD pattern indicates that the Ru element has been successfully doped in the A site of the LaCrO3 ceramic. Whereas, the results of the Energy dispersive spectrometer (EDS) prove that there is no obvious change in the Ru content before and after sintering by SPS, which indicates that no actual Ru loss can occur during the SPS process at 1600 ℃. Moreover, the conductivity of the sintered La1− x Ru x CrO3 increases with increasing Ru content and temperature. The results also indicate that there is good linear relationship between ln( σT ) and 1/ T , demonstrating that the conductivity of the La1− x Ru x CrO3 obeys the Arrhenius law. The activation energy of the doped La1− x Ru x CrO3 ceramic is smaller than that of the LaCrO3 ceramic. Lastly, the feasibility of the application of doped La1− x Ru x CrO3 ceramics as the inert anode of molten salt electrolysis in CaCl2 melt has been investigated at the temperature of 800 ℃. These findings demonstrate that the doped La1− x Ru x CrO3 ceramic has an excellent chemical corrosion-resistant property. However, it has poor thermal stability, which inhibits its application as an inert anode. Future studies focusing on the improvement of the heat-shock resistance and elucidating the corrosion resistance mechanism of La1− x Ru x CrO3 in CaCl2 melt is recommended.

Translated title of the contributionInfluence of Ru doping on the conductivity of LaCrO3 ceramic prepared by SPS and the feasibility of the doped ceramic for an inert anode of molten salt electrolysis
Original languageChinese (Traditional)
Pages (from-to)1335-1342
Number of pages8
JournalGongcheng Kexue Xuebao/Chinese Journal of Engineering
Volume42
Issue number10
DOIs
Publication statusPublished - 1 Oct 2020

Fingerprint

Dive into the research topics of 'Influence of Ru doping on the conductivity of LaCrO3 ceramic prepared by SPS and the feasibility of the doped ceramic for an inert anode of molten salt electrolysis'. Together they form a unique fingerprint.

Cite this