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Alkaline-Earth Metals-Doped Pyrochlore Gd₂Zr₂O₇ as Oxygen Conductors for Improved NO₂ Sensing Performance.

ABSTRACT: This work proposed a novel strategy to fabricate highly-stable NO₂ sensor based on a pyrochlore-phase Gd₂Zr₂O₇ oxygen conductor. The incorporation of alkaline-earth metals distinctly enhances the sensing performance of the Gd₂Zr₂O₇ based sensors. The excellent sensor based on Gd_1.95Ca_0.05Zr₂O_7+? exhibits rapid response-recovery characteristics with the maximum response current value (?I?=?6.4??A), extremely short 90% responce (3?s) and 90% recovery (35?s) time towards 500?ppm NO₂ at 500?°C, which is better than that of commercial YSZ under the same condition. The ?I value towards NO₂ is much higher than those towards other gases (CH₄, C₃H₆, C₃H₈, CO, NO, SO₂, C₂H₄, CO₂ and C₂H₆), exhibiting excellent selectivity for detecting NO₂. The response signal basically maintains a stable value of 6.4??A after the sensors was stored for half a month and a month. The outstanding selectivity and highly stability of the NO ₂ sensors based on Gd_2-xM_xZr₂O_7+? are expected to a promising application in automotive vehicles.

SUBMITTER: Zhong F

PROVIDER: S-EPMC5498611 | biostudies-literature | 2017 Jul

REPOSITORIES: biostudies-literature

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Alkaline-Earth Metals-Doped Pyrochlore Gd2Zr2O7 as Oxygen Conductors for Improved NO2 Sensing Performance.

Zhong Fulan F Zhao Jiwu J Shi Lanqian L Xiao Yihong Y Cai Guohui G Zheng Yong Y Long Jinlin J

Scientific reports 20170705 1

This work proposed a novel strategy to fabricate highly-stable NO2 sensor based on a pyrochlore-phase Gd2Zr2O7 oxygen conductor. The incorporation of alkaline-earth metals distinctly enhances the sensing performance of the Gd2Zr2O7 based sensors. The excellent sensor based on Gd1.95Ca0.05Zr2O7+δ exhibits rapid response-recovery characteristics with the maximum response current ...[more]

PMID: 28680104

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Project description:Bond-length distributions have been examined for 55 configurations of alkali-metal ions and 29 configurations of alkaline-earth-metal ions bonded to oxygen, for 4859 coordination polyhedra and 38?594 bond distances (alkali metals), and for 3038 coordination polyhedra and 24?487 bond distances (alkaline-earth metals). Bond lengths generally show a positively skewed Gaussian distribution that originates from the variation in Born repulsion and Coulomb attraction as a function of interatomic distance. The skewness and kurtosis of these distributions generally decrease with increasing coordination number of the central cation, a result of decreasing Born repulsion with increasing coordination number. We confirm the following minimum coordination numbers: ([3])Li(+), ([3])Na(+), ([4])K(+), ([4])Rb(+), ([6])Cs(+), ([3])Be(2+), ([4])Mg(2+), ([6])Ca(2+), ([6])Sr(2+) and ([6])Ba(2+), but note that some reported examples are the result of extensive dynamic and/or positional short-range disorder and are not ordered arrangements. Some distributions of bond lengths are distinctly multi-modal. This is commonly due to the occurrence of large numbers of structure refinements of a particular structure type in which a particular cation is always present, leading to an over-representation of a specific range of bond lengths. Outliers in the distributions of mean bond lengths are often associated with anomalous values of atomic displacement of the constituent cations and/or anions. For a sample of ([6])Na(+), the ratio Ueq(Na)/Ueq(bonded anions) is partially correlated with ?([6])Na(+)-O(2-)? (R(2) = 0.57), suggesting that the mean bond length is correlated with vibrational/displacement characteristics of the constituent ions for a fixed coordination number. Mean bond lengths also show a weak correlation with bond-length distortion from the mean value in general, although some coordination numbers show the widest variation in mean bond length for zero distortion, e.g. Li(+) in [4]- and [6]-coordination, Na(+) in [4]- and [6]-coordination. For alkali-metal and alkaline-earth-metal ions, there is a positive correlation between cation coordination number and the grand mean incident bond-valence sum at the central cation, the values varying from 0.84?v.u. for ([5])K(+) to 1.06?v.u. for ([8])Li(+), and from 1.76?v.u. for ([7])Ba(2+) to 2.10?v.u. for ([12])Sr(2+). Bond-valence arguments suggest coordination numbers higher than [12] for K(+), Rb(+), Cs(+) and Ba(2+).

Dataset Information

Alkaline-Earth Metals-Doped Pyrochlore Gd₂Zr₂O₇ as Oxygen Conductors for Improved NO₂ Sensing Performance.

Publications

Alkaline-Earth Metals-Doped Pyrochlore Gd<sub>2</sub>Zr<sub>2</sub>O<sub>7</sub> as Oxygen Conductors for Improved NO<sub>2</sub> Sensing Performance.

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