2022
DOI: 10.1002/cssc.202201879
|View full text |Cite
|
Sign up to set email alerts
|

(La1‐xMx)2(Nb0.45Yb0.55)2O7‐δ (M=Ca, Sr, Ba) Ionic Conductors Promoted by Foreign/Domestic Dual Acceptor‐Doping Strategies

Abstract: In this work, a class of ionic conductor (La1‐xMx)2(Nb0.45Yb0.55)2O7‐δ (M=Ca, Sr, and Ba) with a cubic pyrochlore structure was reported. Two strategies were adopted to increase the concentration of oxygen vacancies favoring the hydration reaction to introduce protons. One was increasing the cation ratio between Yb and Nb over unity, the other was doping divalent alkaline earth elements to replace trivalent La. Proton conduction was evidenced by confirming the proton incorporation and H/D isotope effect in ele… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
4

Citation Types

0
4
0

Year Published

2024
2024
2024
2024

Publication Types

Select...
1

Relationship

1
0

Authors

Journals

citations
Cited by 1 publication
(4 citation statements)
references
References 43 publications
0
4
0
Order By: Relevance
“…Firstly, dopant candidates of rare earth elements were screened, including Sc, Y, Nd, Sm, Gd, Ho, Er, Tm and Yb, but only limited compositions showed single phase: La 2 (Nb 0.5 Sc 0.5 ) 2 O 7− δ , La 2 (Nb 1− x Y x ) 2 O 7− δ (LNY, x = 0.60, 0.65, 0.70), 94 and La 2 (Nb 0.45 Yb 0.55 ) 2 O 7− δ (LNYb55). 95 Since there are no extrinsic oxygen vacancies in La 2 (Nb 0.5 Sc 0.5 ) 2 O 7− δ , the conductivity of this sample showed no response to moisture, indicating that there is no proton conduction. The crystal structure of La 2 (Nb 1− x Y x ) 2 O 7− δ (LNY) depends on the composition, and is pyrochlore and fluorite, when x = 0.60 and 0.65 and x = 0.70, respectively.…”
Section: Pyrochlore Oxidesmentioning
confidence: 89%
See 3 more Smart Citations
“…Firstly, dopant candidates of rare earth elements were screened, including Sc, Y, Nd, Sm, Gd, Ho, Er, Tm and Yb, but only limited compositions showed single phase: La 2 (Nb 0.5 Sc 0.5 ) 2 O 7− δ , La 2 (Nb 1− x Y x ) 2 O 7− δ (LNY, x = 0.60, 0.65, 0.70), 94 and La 2 (Nb 0.45 Yb 0.55 ) 2 O 7− δ (LNYb55). 95 Since there are no extrinsic oxygen vacancies in La 2 (Nb 0.5 Sc 0.5 ) 2 O 7− δ , the conductivity of this sample showed no response to moisture, indicating that there is no proton conduction. The crystal structure of La 2 (Nb 1− x Y x ) 2 O 7− δ (LNY) depends on the composition, and is pyrochlore and fluorite, when x = 0.60 and 0.65 and x = 0.70, respectively.…”
Section: Pyrochlore Oxidesmentioning
confidence: 89%
“…The conductivity of La 2 (Nb 0.4 Y 0.6 ) 2 O 7− δ (LNY60) is 3.17 × 10 −4 S cm −1 at 700 °C in wet hydrogen ( p H 2 O = 0.05 atm), and increases by nearly four times to 1.16 × 10 −3 S cm −1 by doping 2.54 at% Ca (La + Ca = 100 at%). 96 Similarly, the conductivity of La 2 (Nb 0.35 Y 0.65 ) 2 O 7− δ (LNY65) increases from 2.88 × 10 −4 S cm −1 to 1.16 × 10 −3 S cm −1 by doping 0.98 at% Sr (La + Sr = 100 at%), 95 and the conductivity of LNYb55 increases from 2.78 × 10 −4 S cm −1 to 4.51 × 10 −4 S cm −1 by doping 3 at% Ca (La + Ca = 100 at%). 94 Anyhow, the conductivity of this system is still too low to be directly used as the electrolyte, but it may be potentially applicable as a buffer layer between the electrode and electrolyte of acceptor-doped BaZrO 3 and Ba(Zr, Ce)O 3 , based on the superior chemical stability of LNY and LNYb55.…”
Section: Pyrochlore Oxidesmentioning
confidence: 99%
See 2 more Smart Citations