In3+-doped Sr2Fe1.5Mo0.5O6−δ cathode with improved performance for an intermediate-temperature solid oxide fuel cell
Yumei Ma, Lijie Zhang, Kang Zhu, Binze Zhang, Ranran Peng, Changrong Xia, Ling Huang
Abstract
Promoting the oxygen reduction reaction (ORR) is critical for commercialization of intermediate-temperature solid oxide fuel cells (IT-SOFCs), where Sr2Fe1.5Mo0.5O6−δ (SFM) is a promising cathode by working as a mixed ionic and electronic conductor. In this work, doping of In3+ greatly increases the oxygen vacancy concentration and the content of adsorbed oxygen species in Sr2Fe1.5Mo0.5−xInxO6−δ (SFMInx), and thus effectively promotes the ORR performance. As a typical example, SFMIn0.1 reduces the polarization resistance (Rp) from 0.089 to 0.046 Q·cm2 at 800 °C, which is superior to those doped with other metal elements. In addition, SFMIn0.1 increases the peak power density from 0.92 to 1.47 W·cm−2 at 800 °C with humidified H2 as the fuel, indicating that In3+ doping at the Mo site can effectively improve the performance of SOFC cathode material.