CuCo2O4-Er0.4Bi1.6O3-δ: An active hybrid cathode for intermediate temperature solid oxide fuel cells. Issue 5 (1st April 2019)

• Record Type: Journal Article
• Authors: Kong, Yu; Sun, Chengzhi; Wu, Xian; Zhang, Yu; Zhang, Naiqing; Sun, Kening
• Is Part Of: Ceramics international. Volume 45:Issue 5(2019)
• Page Start: 6037
• Page End: 6042
• Publication Date: 2019-04-01
• Subjects: CuCo2O4-Er0.4Bi1.6O3-δ composite cathode -- Intermediate temperatures solid oxide fuel cells -- Sintering temperature -- Oxygen reduction reaction; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.12.074
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The sluggish oxygen reduction reaction acts as a vital barrier to the performance enhancement for intermediate temperature solid oxide fuel cells. In this paper we report a CuCo2 O4 -Er0.4 Bi1.6 O3-δ composite cathode synthesized via sol-gel and subsequent mechanical mixing methods. The composite cathode contains an electronic conductor CuCo2 O4 and an ionic conductor Er0.4 Bi1.6 O3-δ, dramatically enhancing the oxygen reduction reaction kinetics and the sintering performance. Introduction of the Er0.4 Bi1.6 O3-δ nanoparticles brings an obvious increase of triple phase boundaries and enhancement of electrochemical activities. As expected, the composite cathode with addition of 35 wt% of Er0.4 Bi1.6 O3-δ shows the least polarization resistance of 0.07 Ω cm 2 in air at 800 °C. What's more, the sintering temperature is distinctly reduced from 1000 °C to 800 °C. Highlights: The sintering temperature of the electrode can be reduced to 800 °C by the introduction of Er0.4 Bi1.6 O3-δ . The introduction of Er0.4 Bi1.6 O3-δ can bring out a 42% drop in the polarization resistance of CuCo2 O4 cathode. The rate-limiting steps in oxygen reduction reaction have been confirmed by the test of EIS with different oxygen partial pressure.