Fabrication and Characterization of YSZ/ScSZ Bilayer Electrolyte via Cold-Isostatic Pressing (CIP) Method for Intermediate Temperature-Solid Oxide Fuel Cell (IT-SOFC) Application

Abstract

Solid oxide fuel cell (SOFC) technology has advanced significantly in the recent years, and now is an interest of many renewable energy-related industries to invest. However, the main issue of SOFC is the high operating temperature that negatively influence its performance. To reduce the temperature, a method of using bilayer electrolyte is proposed. In this study, a bilayer electrolyte of Yttria-Stabilised Zirconia (YSZ) and Scandia-Stabilized Zirconia (ScSZ) is used with the objective to reduce the temperature of SOFC to intermediate temperature ranges. To achieve the objective, bilayer YSZ/ScSZ electrolyte has been fabricated at different compositions using cold-pressing method. The pellets were sintered at three different temperature of 1350°C, 1450°C and 1550°C. In this studies, all the prepared pellets were characterized under Scanning Electron Microscopy (SEM) to examine its microstructure, Archimedes Method to measure the density and Electochemical Impedance Spectroscopy (EIS) to measure the conductivity. The results show that all of produced pellets are dense and ionic conductivity showed a rising trend as sintering temperature increases. Based on this study, the best composition is the pellet with combination of 25% YSZ: 75% ScSZ sintered at 1450°C.

Advanced modification of scandia‐stabilized zirconia electrolytes for solid oxide fuel cells application—A review

“…With the 200 nm ScSZ/GDC bilayer, the presence of GDC reduces the bilayer electrolyte ohm‐resistance, which is useful in ionic diffusion through the solid electrolyte to achieve high cell performance at low operating temperatures. Mat et al 94 fabricated the YSZ/ScSZ bilayer electrolyte for promising solid electrolyte to applied in IT‐SOFCs. The use of YSZ offered high ionic conductivity and stability.…”

Fuel cells as an advanced alternative energy source for the residential sector applications in Malaysia

“…Besides, the high operating working temperature leads to recycling heat waste for the cogeneration energy production system. 74,75…”

“…Especially, for vast applications such as power generation system for plant stations due to capabilities to producing high electrical energy and flexibility in various fuel consumption. Besides, the high operating working temperature leads to recycling heat waste for the cogeneration energy production system 74,75 . SOFCs run at reasonably high temperatures from 500°C to 1000°C.…”