Synthesis of Nanocrystalline Ba0,5Sr0,5FeO3-δ by Sol-gel Self-Combustion Method

Abstract

Fuel cell is a one of device to convert chemical into proper electric energy, has some advantages including high efficiency, long term stability, fuel flexibility, environment friendly. To develop SOFC operates at intermediate temperature (500-700°C), it is necessary to figure out a cathode material capable of overcoming the low electrochemical reduction activity in oxygen at intermediate temperatures. Ba0,5Sr0,5FeO3-δ (BSF) has mixed ionic and electronic conductivity properties (MIEC). A sol-gel self-combustion method was used to synthesize BSF due to easier preparation and produces excellent result (high homogeneity and high reactivity) powder. Two conditions were set up in different pH, namely 0-1 and 6-7. The self-combustion reaction occurred on heating up to 220 °C and produced yield ashes. To acquire the calcination condition, the temperature was carried out at 500, 700, 900, 1000, and 1100 °C for 6 hours. In this study, the phase formation, structure, and crystallite size of BSF was characterized by make use of X-ray diffraction (XRD) data. The results show that BSF has cubic perovskite structure with space group pm3m (221), crystallite size 52 and 109 nm for pH 0-1 and 6-7 respectively.