Rare earth elements based oxide ion conductors

Li, Xiaohui; Kuang, Xiaojun; Sun, Junliang

doi:10.1039/d0qi00848f

Cited by 30 publications

(16 citation statements)

References 222 publications

(263 reference statements)

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“…For this purpose, there remains a strong motivation to develop electrolyte materials with high fluoride-ion conductivities at room temperature. Oxide-ion conductors have also attracted much attention due to a wide variety of applications including solid-oxide fuel cells (SOFCs). − Since the working temperature of SOFCs using conventional yttria-stabilized zirconia (YSZ) electrolytes is high, various electrolyte materials have been developed to reduce the operating temperature and cost. − Crucial to the development of fluoride-ion and oxide-ion conductors is the knowledge of the crystal structure and ion-diffusion mechanism at an atomic scale. Therefore, many researchers have studied the crystal structure and ion-diffusion mechanism of fluoride-ion and oxide-ion conductors. ,− A single-phase mixed-anion compound contains two or more anion species.…”

Section: Introductionmentioning

confidence: 99%

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La_0.9Sr_0.1O_0.45F₂

Hibino

Tanaka

Kozakai

et al. 2021

ACS Appl. Energy Mater.

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Fluoride-ion and oxide-ion conductors are attractive materials due to their wide applications such as next-generation fluoride-ion batteries and solid oxide fuel cells. Crucial to the development of these anion conductors is the knowledge of crystal structures and the ion-diffusion mechanism at an atomic scale. Recently, mixed-anion compounds have attracted much attention, but experimental visualization of anion-diffusion pathways is very rare in mixed-anion compounds. Lanthanum oxyfluoride LaOF-based materials are mixed-anion compounds and exhibit high anion (fluoride-ion and oxide-ion) conductivities; however, their high-temperature crystal structures and anion-diffusion mechanism are not known satisfactorily. Herein, we report detailed information on the crystal structure and structural disorder of La0.9Sr0.1O0.45F2 and LaOF from −243 °C (30 K) to 600 °C. Trigonal R3̅m β-LaOF undergoes a first-order phase transition into a cubic α-phase with the Fm3̅m fluorite-type structure around 490 °C on heating, while La0.9Sr0.1O0.45F2 is a cubic Fm3̅m α-phase between −243 and 600 °C. Neither significant amounts of interstitial anions at the 32f site nor significant anion vacancies at the lattice 8c site are observed in cubic LaOF at 600 °C, while both interstitial anions at the 32f site and anion vacancies at the lattice 8c site exist in cubic La0.9Sr0.1O0.45F2 from −243 to 600 °C. We have succeeded in experimental visualization of anion-diffusion pathways in La0.9Sr0.1O0.45F2. It was found that the anions migrate through both the interstitial 32f and lattice 8c sites (8c–32f–32f–8c anion-diffusion pathways), indicating an interstitialcy diffusion mechanism. The existence of interstitial anions and anion vacancies and the formation of the anion-diffusion pathways are the structural origins of the high anion conductivity of La0.9Sr0.1O0.45F2. The present elucidation of the crystal structure and anion-diffusion mechanism might provide useful knowledge for the design of superior anion conductors, which develop the next-generation fluoride-ion batteries and solid oxide fuel cells.

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Section: Introductionmentioning

confidence: 99%

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La_0.9Sr_0.1O_0.45F₂

Hibino

Tanaka

Kozakai

et al. 2021

ACS Appl. Energy Mater.

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“…Due to the recent advances in ISEs and the increasing availability of various nanomaterials [61][62][63][64][65][66] , we expect much more attention from the researchers will be increased on the fabrication of selective ISEs and nanomaterials-based potentiometric platforms for pharmaceutical drug analysis in different dosage forms, quality control, and quality assurance of drug molecules, and TDM in biological fluids. We believe that the use of new materials will enhance the LOD, selectivity, sensitivity, biocompatibility, lifetime, and sensor working stability of ISEs.…”

Section: Conclusion and Outlooksmentioning

confidence: 99%

Potentiometric sensors for the determination of pharmaceutical drugs

et al. 2022

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Potentiometric sensors based on ion-selective membrane electrodes have continued to get great attention from the scientific community. These sensors have been employed in several applications including medicine, forensic analysis, environmental assessment, industry, agriculture, and pharmaceutical drug analysis. Indeed these sensors possess several advantages for example simple design, fabrication, and manipulation, rapid response time, good selectivity, applicability to colored and turbid solutions, and possible interfacing with automated and computerized systems. On the other hand, therapeutic drug monitoring and detection of pharmaceutical drugs in their pharmaceutical formulations and biological matrices are highly significant from a medical point of view especially for drugs with a narrow therapeutic index such as anticancer drugs which can cause fatal side effects for patients. Interestingly, potentiometric sensors have been broadly employed as one of the most important electrochemical approaches for pharmaceutical drug analysis. Moreover, the breakthroughs in potentiometric sensors based on ion-selective electrodes (ISEs) make them superior to the other reported methods for pharmaceutical drug analysis in terms of many performance parameters such as sensitivity, selectivity, low detection limit, and low cost. In this review, we try to offer a summary prologue to the applicability and merits of the potentiometric sensors that have been employed for pharmaceutical drug analysis emphasizing their application for the assay of pharmaceutical drugs in their dosage forms and the in-vivo assay of pharmaceutical drugs in different biological samples such as milk, water, plasma, and urine.

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“…[1][2][3][4][5] Solid oxide fuel cells (SOFCs) have been attracting considerable attention due to their multiple advantages, such as high safety due to all solid state, high overall energy efficiency (>80%), and flexibility of fuels. 6,7 The current problem that limits the commercial application of SOFCs is the high operating temperature (700-1000 °C) and the resultant chemical and mechanical compatibility isues. 8,9 Oxide ion conductors play the role of transporting oxide ions, which is a key component in determining the operating temperatures of SOFCs.…”

Section: Introductionmentioning

confidence: 99%

Structure, electrical properties, and conduction mechanism of new germanate mixed Zn-doped In₂Ge₂O₇ conductors

Zeng

et al. 2022

Inorg. Chem. Front.

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Rare earth elements based oxide ion conductors

Abstract: Rare earth elements (REs) based oxide ion conductors has promising performances and potential applications in solid oxide fuel cells (SOFCs). To meet the requirements of intermediate temperature (IT)-SOFCs operating at...

Cited by 30 publications

References 222 publications

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La_0.9Sr_0.1O_0.45F₂

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La_0.9Sr_0.1O_0.45F₂

Potentiometric sensors for the determination of pharmaceutical drugs

Structure, electrical properties, and conduction mechanism of new germanate mixed Zn-doped In₂Ge₂O₇ conductors

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Rare earth elements based oxide ion conductors

Abstract: Rare earth elements (REs) based oxide ion conductors has promising performances and potential applications in solid oxide fuel cells (SOFCs). To meet the requirements of intermediate temperature (IT)-SOFCs operating at...

Cited by 30 publications

References 222 publications

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La0.9Sr0.1O0.45F2

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La0.9Sr0.1O0.45F2

Potentiometric sensors for the determination of pharmaceutical drugs

Structure, electrical properties, and conduction mechanism of new germanate mixed Zn-doped In2Ge2O7 conductors

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Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La_0.9Sr_0.1O_0.45F₂

Experimental Visualization of the Interstitialcy Diffusion of Anions in the LaOF-Based Oxyfluoride La_0.9Sr_0.1O_0.45F₂

Structure, electrical properties, and conduction mechanism of new germanate mixed Zn-doped In₂Ge₂O₇ conductors