Affiliation:
1. Xi'an Jiaotong University
2. Southeast University
3. Aalto University
Abstract
Abstract
Common perovskite oxide electrolytes, such as BaCe(Zr)O3−δ, exhibit proton conductivity ranging from 10− 3 to 10− 2 S cm− 1 at 600°C for protonic ceramic fuel cells (PCFCs). This study presents a novel approach to develop high proton conduction along oxide-ion conductor of a fluorite gadolinium doped ceria (GDC: Gd0.1Ce0.9O2−δ) by electrochemical proton injection via an in-situ fuel cell process. A high ionic conductivity of 0.17 S cm− 1 has been achieved and a fuel cell employing a 400-µm thick GDC electrolyte delivered a peak power output close to 1000 mW cm− 2 at 500°C, validating the effectiveness of proton conduction. The transformation process of GDC from an oxygen-ion conductor to a proton conductor revealed a synergistic mechanism involving both surface proton conduction and bulk oxygen-ion migration. These findings provide new insights into the ionic transport mechanism and offer opening new avenues for advanced protonic ceramic fuel cells at lower temperatures.
Publisher
Research Square Platform LLC