Promotion of oxygen reduction reaction on a double perovskite electrode by a water-induced surface modification

Jun Hyuk Kim, Seonyoung Yoo, Ryan Murphy, Yu Chen, Yong Ding, Kai Pei, Bote Zhao, Guntae Kim, YongMan Choi, Meilin Liu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Highly efficient air electrodes are a key component of reversible fuel cells for energy storage and conversion; however, the development of efficient electrodes that are stable against water vapor remains a grand challenge. Here we report an air-electrode, composed of double perovskite material PrBa0.8Ca0.2Co2O5+δ (PBCC) backbone coated with nanoparticles (NPs) of BaCoO3-δ (BCO), that exhibits remarkable electrocatalytic activity for oxygen reduction reaction (ORR) while maintaining excellent tolerance to water vapor. When tested in a symmetrical cell exposed to wet air with 3 vol% H2O at 750 °C, the electrode shows an area specific resistance of ∼0.03 Ω cm2 in an extended period of time. The performance enhancement is attributed mainly to the electrocatalytic activity of the BCO NPs dispersed on the surface of the porous PBCC electrode. Moreover, in situ Raman spectroscopy is used to probe reaction intermediates (e.g., oxygen species) on electrode surfaces, as the electrochemical properties of the electrodes are characterized under the same conditions. The direct correlation between surface chemistry and electrochemical behavior of an electrode is vital to gaining insight into the mechanisms of the electrocatalytic processes in fuel cells and electrolysers.

Original languageEnglish
Pages (from-to)1506-1516
Number of pages11
JournalEnergy and Environmental Science
Volume14
Issue number3
DOIs
StatePublished - Mar 2021

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