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A Promising Proton Conducting Electrolyte BaZr1-xHoxO3-? (0.05 ? x ? 0.20) Ceramics for Intermediate Temperature Solid Oxide Fuel Cells.

ABSTRACT: In this study, the Ho-substituted BaZrO3 electrolyte ceramics (BaZr1-xHoxO3-?, 0.05 ? x ? 0.20) were synthesized through a low-cost flash pyrolysis process followed by conventional sintering. The effects of Ho-substitution in BaZrO3 studied in terms of the structural phase relationship, microstructure and electrical conductivity to substantiate augmented total electrical conductivity for intermediate temperature solid oxide fuel cells (IT-SOFCs). The Rietveld refined X-ray diffraction (XRD) patterns revealed that pure phase with [Formula: see text] space group symmetry of cubic crystal system as originated in all samples sintered at 1600?°C for 8?h. The Raman spectroscopic investigations also approved that Ho incorporation in BaZrO3 ceramics. Field Emission Scanning Microscopic (FESEM) study informed a mixture of fine and coarse grains in the fracture surface of Ho-substituted BaZrO3 sintered samples. The relative density and average grain size of samples were observed to decrease as per the addition of Ho-substitution in BaZrO3 ceramics. The electrical conductivity study was accomplished by Electrical Impedance Spectroscopy (EIS) under 3% humidified O2 atmosphere from 300 to 800?°C. Furthermore, the total electrical conductivity of BaZr0.8Ho0.2O3-? ceramic was found to be 5.8?×?10-3 S-cm-1 at 600?°C under 3% humidified atmosphere, which may be a promising electrolyte for IT-SOFCs.

SUBMITTER: Saini DS 

PROVIDER: S-EPMC7044191 | biostudies-literature | 2020 Feb

REPOSITORIES: biostudies-literature

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A Promising Proton Conducting Electrolyte BaZr<sub>1-x</sub>Ho<sub>x</sub>O<sub>3-δ</sub> (0.05 ≤ x ≤ 0.20) Ceramics for Intermediate Temperature Solid Oxide Fuel Cells.

Saini Deepash S DS   Ghosh Avijit A   Tripathy Shuvendu S   Kumar Aparabal A   Sharma Sanjeev K SK   Kumar Nawnit N   Majumdar Shubhankar S   Bhattacharya Debasis D  

Scientific reports 20200226 1

In this study, the Ho-substituted BaZrO<sub>3</sub> electrolyte ceramics (BaZr<sub>1-x</sub>Ho<sub>x</sub>O<sub>3-δ</sub>, 0.05 ≤ x ≤ 0.20) were synthesized through a low-cost flash pyrolysis process followed by conventional sintering. The effects of Ho-substitution in BaZrO<sub>3</sub> studied in terms of the structural phase relationship, microstructure and electrical conductivity to substantiate augmented total electrical conductivity for intermediate temperature solid oxide fuel cells (IT-SO  ...[more]

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