An Active and Robust Air Electrode for Reversible Protonic Ceramic Electrochemical Cells

作者：Zhou, Yucun; Liu, Enzuo; Chen, Yu^*; Liu, Yuchen; Zhang, Lei; Zhang, Weilin; Luo, Zheyu; Kane, Nicholas; Zhao, Bote; Soule, Luke; Niu, Yinghua; Ding, Yong; Ding, Hanping; Ding, Dong; Liu, Meilin^*

来源：ACS Energy Letters, 2021, 6(4): 1511-1520.

DOI：10.1021/acsenergylett.1c00432

• OXIDE FUEL-CELL
• STEAM ELECTROLYSIS
• CONDUCTING ELECTROLYTE
• OXYGEN ELECTRODES
• CATHODE MATERIALS
• HIGH-PERFORMANCE
• POWER-DENSITY
• DEGRADATION
• PEROVSKITE
• TRANSPORT

Reversible protonic ceramic electrochemical cells (R-PCECs) are a promising option for efficient and low-cost generation of electricity and hydrogen. Commercialization of R-PCECs, however, hinges on the development of highly active and robust air electrodes. Here, we report an air electrode consisting of PrBa0.8Ca0.2Co2O5+delta and in situ exsolved BaCoO3-delta nanoparticles (PBCC-BCO) that shows minimal polarization resistance (similar to 0.24 Omega cm(2) at 600 degrees C) and high stability when exposed to humidified air with 3-50% H2O. An R-PCEC utilizing PBCC-BCO demonstrates remarkable performances at 600 degrees C: achieving a peak power density of 1.06 W cm(-2) in the fuel cell mode and a current density of 1.51 A cm(-2) at 1.3 V in an electrolysis mode. More importantly, the R-PCECs demonstrate an exceptionally high durability over 1833 h of continuous operation in the electrolysis mode. This work offers an efficient approach to design of high-performance and durable electrodes for R-PCECs.

• 单位
  天津大学; y