Study of glycine nitrate precursor method for the synthesis of gadolinium doped ceria (Ce_0.8Gd_0.2O_1.90) as an electrolyte for intermediate temperature solid oxide fuel cells

Abstract

This is a detailed study of the synthesis parameters and their effects on the physical properties and ionic conductivity of gadolinium-doped ceria prepared using a glycine nitrate precursor combustion method.

Oxygen ion conducting glass ceramic composites for high temperature sensor applications

“…The sample shows temperature dependent ionic conductivity withactivation energy of 0.44 eV. It is seenthat this activation energy is higher comparedwith the GDCsynthesized by Glycine nitrate method and sintered at 1350 °C [7].…”

“…Thisindicates thermally activated frequency relaxation and isattributed to lowering of impedance across grain boundary as temperature increases. Therelaxation peak intensities are also found to be decreasing withincreasing temperature due to lowering in capacitive reactanceacross the grain boundaries [7]. Figure 4 presents Arrhenius plot of Log (σT) versus 1000/T measured for the pellet, where σ is total conductivity.…”

“…A parallel combinationof constant phase element and a resistancerepresentsthe grain boundary contribution while the parallel combinationof CPE and a resistance along with Warburg element represent the contribution from the grains to the impedance. TheWarburg element in the equivalent circuit of the grains shows linear ionic diffusion within the grains [7]. The measured ionic conductivityof the Nyquist plots is tabulated in Table 1.…”

“…These oxygen ion sensors must have ionic conductivity in the range of 0.1-0.001 S cm -1 at given operating temperature range (500-700 ˚C) to create a measurable open circuit voltage (OCV) [6]. Gadolinium doped Ceria possesses ionic conductivity in above mentioned range.However, being a ceramic material, it requires higher sintering temperature in the range of 1200-1600 °C to achieve desired density (>96 % of theoretical density), which is an important factor affecting ionic conductivity [7].…”

SINTESIS DAN KARAKTERISASI ELEKTROLIT Ce0,9Gd0,1-XNdXO1,90 UNTUK APLIKASI SEL BAHAN BAKAR PADATAN SUHU SEDANG

“…Besarnya densitas dari suatu material dapat dipengaruhi oleh beberapa hal yaitu suhu kalsinasi, sintering dan tekanan yang diberikan pada suatu material. Hal tersebut dapat menyebabkan berkurangnya volume sehingga meningkatnya densitas [7,20].…”