Robust doped BaCeO3-δ electrolyte for IT-SOFCs

Abstract

Single phase polycrystalline BaZr0.3Ce0.5Y0.1Yb0.1O3-δ electrolyte material was prepared by solid state reaction route. Rietveld analysis of the XRD data confirms the tetragonal symmetry in the I4/mcm space group with unit cell parameters of a = b = 6.0567(3) Å and c = 8.5831(5) Å. The addition of ZnO as a sintering additive was found to reduce the sintering temperature and enhance both overall sinterability and grain growth. Sintering temperature was reduced by 200-300ºC and a very high relative density of about 98% was achieved at 1400 o C. Impedance spectroscopy in humidified 5% H2/Ar atmosphere shows that the protonic conductivity at 600 o C was 8.60 x 10-3 S cm-1. Thermal analysis performed in pure CO2 atmosphere shows very good chemical stability up to 1200 o C. Good biaxial flexure strength of 100-200 MPa was reported which makes this material a promising electrolyte material for intermediate temperature solid oxide fuel cells (IT-SOFCs).

Nanotechnologies in ceramic electrochemical cells

“…A sol-gel combustion reaction is a typical strategy and has been commonly used toward the syntheses of nano-size powders, as reported in previous literature. [258][259][260][261] For the samples obtained via this method, the particle characteristics will be influenced by several factors. Among them, the chelating agent is one crucial factor contributing to the morphology evolution of NPs.…”

Co-electrolysis of CO2 and H2O in high-temperature solid oxide electrolysis cells: Recent advance in cathodes

“…4 . Owing to the high sintering temperature requirement and poor CO 2 tolerance of proton conducting SOECs [38][39][40][41][42][43] , nowadays most studies are concentrated on the oxygen Fig. 4.…”

Computational Fluid Dynamics for Protonic Ceramic Fuel Cell Stack Modeling: A Brief Review

“…Due to difficulties in the compression and transportation of hydrogen, the researchers shifted to focus on fuels such as hydrocarbon or ammonia to remove carbon and prevent CO 2 poisoning easily [12][13][14]. In addition, PCFCs have more benefits than other fuel cells, including high power density, less weight, rapid startup, high flexibility, a long lifetime, and small size [15].…”

“…have more benefits than other fuel cells, including high power density startup, high flexibility, a long lifetime, and small size [15]. PCFCs are the same as conventional O-SOFCs; however, in ceram is produced on the cathode side, whereas in solid oxide fuel cells (SOFC on the anode side [16].…”