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In this study, the Ho-substituted BaZrO 3  electrolyte ceramics (BaZr 1- x  Ho  x  O 3-δ , 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 3  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    \documentclass[12pt]{minimal} 				\usepackage{amsmath} 				\usepackage{wasysym}  				\usepackage{amsfonts}  				\usepackage{amssymb}  				\usepackage{amsbsy} 				\usepackage{mathrsfs} 				\usepackage{upgreek} 				\setlength{\oddsidemargin}{-69pt} 				\begin{document}$$Pm\bar{3}m$$\end{document}   P  m   3  ¯   mspace 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 BaZrO 3  ceramics. Field Emission Scanning Microscopic (FESEM) study informed a mixture of fine and coarse grains in the fracture surface of Ho-substituted BaZrO 3  sintered samples. The relative density and average grain size of samples were observed to decrease as per the addition of Ho-substitution in BaZrO 3  ceramics. The electrical conductivity study was accomplished by Electrical Impedance Spectroscopy (EIS) under 3% humidified O 2  atmosphere from 300 to 800 ° C . Furthermore, the total electrical conductivity of BaZr 0.8 Ho 0.2 O 3-δ  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.

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