Evaluation of polymorphism and charge transport in a BaO–CaO–Ta<sub>2</sub>O<sub>5</sub> perovskite phase diagram using TOF-neutron and synchrotron X-ray diffraction, the bond-valence method and impedance spectroscopy

Singh, Kalpana; Yang, Hua; Zhang, Zheyu; Avdeev, Maxim; Huq, Ashfia; Wu, Dongying; Lee, Jey‐Jau; Kan, Wang Hay; Thangadurai, Venkataraman

doi:10.1039/d2ta02725a

Cited by 1 publication

(1 citation statement)

References 60 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Refinement results are given in Table S1. Bond valence sum (BVS) calculations are used to assess the chemical plausibility of BCFZnY and BCFZrY crystal structures. , The global instability index (GII) has been previously used to evaluate the crystallographic stability of cubic ABO 3 -type perovskite oxides. A GII value >0.2 is typically taken as an indication that there is a problem with the reported structure model, and the equation is shown in Supplementary Note 1.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Proton Conduction with Low Oxygen Vacancy Concentration and Favorable Hydration for Protonic Ceramic Fuel Cells Cathode

Wang

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Protonic ceramic fuel cells (PCFCs), as an efficient energy storage and conversion device, have great potential to solve the serious problems of energy shortage and environmental pollution. Improving the proton conductivity of the promising cathode materials is an effective solution to promote the widespread application of PCFCs at low temperatures (450–650 °C). Herein, considering the high oxygen reduction reaction (ORR) activity of BaCoO3-based perovskite oxide and beneficial proton uptake capacity of Zn-doping, we construct BaCo0.4Fe0.4Zn0.1Y0.1O3‑δ (BCFZnY) as the PCFCs cathode, and compare it with the classic triple-conducting cathode BaCo0.4Fe0.4Zr0.1Y0.1O3‑δ (BCFZrY). Different from the general strategy of increasing the initial oxygen vacancy concentration of cathode materials, this work unveils that enhancing the hydration of perovskite oxide with low oxygen vacancy concentration is a more effective strategy to accelerate the proton diffusion in the electrode. Therefore, the BCFZnY cathode achieved excellent proton conductivities of 8.05 × 10–3 and 6.38 × 10–3 S cm–1 as obtained by hydrogen permeation measurements and peak power densities of 982 and 320 mW cm–2 in a BaZr0.1Ce0.7Y0.1Yb0.1O3‑δ-based anode-supported fuel cell at 600 and 450 °C, respectively.

show abstract

Section: Resultsmentioning

confidence: 99%

Enhanced Proton Conduction with Low Oxygen Vacancy Concentration and Favorable Hydration for Protonic Ceramic Fuel Cells Cathode

Wang

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

Evaluation of polymorphism and charge transport in a BaO–CaO–Ta₂O₅ perovskite phase diagram using TOF-neutron and synchrotron X-ray diffraction, the bond-valence method and impedance spectroscopy

Abstract: Among the alkaline earth-based perovskite oxides, the Ba-based perovskites have superior chemical stability and tunable electrical/catalytic property via chemical substitution/doping. One of the best-known examples is Ba3Ca1.18Nb1.82O8.73 as ceramic proton...

Cited by 1 publication

References 60 publications

Enhanced Proton Conduction with Low Oxygen Vacancy Concentration and Favorable Hydration for Protonic Ceramic Fuel Cells Cathode

Enhanced Proton Conduction with Low Oxygen Vacancy Concentration and Favorable Hydration for Protonic Ceramic Fuel Cells Cathode

Contact Info

Product

Resources

About

Evaluation of polymorphism and charge transport in a BaO–CaO–Ta2O5 perovskite phase diagram using TOF-neutron and synchrotron X-ray diffraction, the bond-valence method and impedance spectroscopy

Abstract: Among the alkaline earth-based perovskite oxides, the Ba-based perovskites have superior chemical stability and tunable electrical/catalytic property via chemical substitution/doping. One of the best-known examples is Ba3Ca1.18Nb1.82O8.73 as ceramic proton...

Cited by 1 publication

References 60 publications

Enhanced Proton Conduction with Low Oxygen Vacancy Concentration and Favorable Hydration for Protonic Ceramic Fuel Cells Cathode

Enhanced Proton Conduction with Low Oxygen Vacancy Concentration and Favorable Hydration for Protonic Ceramic Fuel Cells Cathode

Contact Info

Product

Resources

About

Evaluation of polymorphism and charge transport in a BaO–CaO–Ta₂O₅ perovskite phase diagram using TOF-neutron and synchrotron X-ray diffraction, the bond-valence method and impedance spectroscopy