Doped Ceria Based Solid Oxide Fuel Cell Electrolytes and their Sintering Aspects: An Overview

Abstract

Depletion of fossil fuel at an alarming rate is a major concern of humankind. Consequently, researchers all over the world are putting a concerted effort for finding alternative and renewable energy. Solid oxide fuel cell (SOFC) is one such system. SOFCs are electrochemical devices that have several advantages over conventional power generation systems like high efficiency of power generation, low emission of green house gases and the fuel flexibility. The major research focus of recent times is to reduce the operating temperature of SOFC in the range of 500 to 700 °C so as to render it commercially viable. This reduction in temperature is largely dependent on finding an electrolyte material with adequate oxygen ion conductivity at the intended operating temperature. One much material is Gadolinia doped Ceria (CGO) that shows very good oxygen ion conductivity at the intended operation temperature. The aim of this overview is to highlight the contribution that materials chemistry has made to the development of CGO as an electrolyte.

Hydrothermal Synthesis, Characterization, and Sintering Behavior of Core-Shell Particles: A Principle Study on Lanthanum Strontium Cobaltite Coated with Nanosized Gadolinium Doped Ceria

“…This work covers a detailed characterization of (a) the individual LSC-CGO core-shell particles and (b) the composites after densification.Ceramics 2018, 1 247 production. However, obtaining such desired structures in a dense bulk form is challenging due to the fact that the sintering temperatures for these two materials are different and that the high temperature required for densifying a CGO of poor sinterability (1400-1600 • C to reach the full density of pure CGO) is problematic [7,8]. Moreover, since LSC and CGO have rather different thermal expansion coefficients, it is even more difficult to obtain a fully dense large sample without cracking [9].…”