La.8Sr.2Co1-xNi xO3-δas the Efficient Triple Conductor Air Electrode for Protonic Ceramic Cells

Ning Wang, Hajime Toriumi, Yuki Sato, Chunmei Tang, Takashi Nakamura, Koji Amezawa, Sho Kitano, Hiroki Habazaki, Yoshitaka Aoki

Research output: Contribution to journalArticlepeer-review

Abstract

Highly efficient mixed H+/e-/O2- triple conducting air electrodes are indispensable for improving the electrochemical performance of protonic ceramic fuel cells and electrolysis cells (PCFC/ECs) operating at intermediate temperatures. This study demonstrates that single perovskite-type La0.8Sr0.2Co1-xNixO3-δ families (LSCN, x = 0-0.3) are efficient H+/e-/O2- triple conductors due to a pronounced hydration ability at elevated temperatures with a related enthalpy of -107 kJ mol-1. Thermogravimetry confirmed that the oxides were capable of a 0.01 mole fraction proton uptake at 600 °C and pH2O of 0.023 atm. Reversible protonic ceramic cells were fabricated using these oxides as an air electrode and exhibited promising performance with a peak power density of 0.88 W cm-2 in fuel cell mode and an electrolysis current of 1.09 A cm-2 at a thermal neutral voltage in electrolysis cell mode at 600 °C. Impedance analysis confirmed that the polarization resistance of the La0.8Sr0.2Co0.7Ni0.3O3-δ cell was 0.09 ω cm2 under an open circuit potential at 600 °C, which is much smaller than the polarization resistances reported for cells with a single or double perovskite-type triple conductor. The current results indicate that mixed H+/e-/O2- triple phase conducting LSCN oxides are promising air electrodes for protonic ceramic cells operating in the intermediate temperature region at approximately 600 °C.

Original languageEnglish
JournalACS Applied Energy Materials
DOIs
Publication statusAccepted/In press - 2021

Keywords

  • proton-electron-oxide ion triple conductor
  • reversible protonic ceramic cell

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

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