Tuning the high temperature properties of PrSrCoO4 cathode with Cu2+ dopant for intermediate temperature solid oxide fuel cells

Jian-Wei Liu, Qiang Li, Li-Ping Sun, Li-Hua Huo, Hui Zhao, Bassat Jean-Marc, Fourcade Sébastien and Grenier Jean-Claude

Renewable Energy, 2020, vol. 159, issue C, 486-493

Abstract: PrSrCo1-xCuxO4+δ (x = 0.0, 0.1, 0.3, 0.5) are synthesized by solid-state reaction method. The effects of Cu2+ doping on electrical conductivity, thermal expansion, oxygen diffusion properties and oxygen reduction reaction (ORR) activity are investigated. PrSrCo1-xCuxO4+δ oxides crystallize in a single-phase tetragonal structure with I4/mmm space group. Partial substitution Co3+ by Cu2+ results the increase of electrical conductivity and decrease of thermal expansion coefficient. Introducing Cu2+ promotes the formation of interstitial oxygen, accelerates the kinetics of oxygen transport, and significantly improves the electrocatalytic activity of ORR. The lowest area specific resistance (ASR) value of 0.08 Ω cm2 is obtained for the PrSrCo0.7Cu0.3O4+δ cathode at 700 °C in air. The ORR mechanism study demonstrates that Cu-doping (30%) promotes the charge transfer process. The reaction rate control step on PrSrCo0.7Cu0.3O4+δ cathode is the dissociation and surface diffusion process of adsorbed molecular oxygen.

Keywords: Solid oxide fuel cells (SOFCs); K2NiF4 structure; Cathode material; Electrochemical properties (search for similar items in EconPapers)
Date: 2020
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:159:y:2020:i:c:p:486-493

DOI: 10.1016/j.renene.2020.06.032

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