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Composite electrolyte based on nanostructured Ce 0.8 Sm 0.2 O 1.9 (SDC) for low‐temperature solid oxide fuel cells
Author(s) -
Gao Zhan,
Mao Zongqiang,
Wang Cheng,
Huang Jianbing,
Liu Zhixiang
Publication year - 2009
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.1597
Subject(s) - electrolyte , ionic conductivity , materials science , conductivity , anode , solid oxide fuel cell , oxide , composite number , open circuit voltage , electrochemistry , chemical engineering , cathode , analytical chemistry (journal) , chemistry , composite material , electrode , metallurgy , voltage , electrical engineering , chromatography , engineering
Abstract Nanostructured Ce 0.8 Sm 0.2 O 1.9 (SDC) is investigated for low‐temperature solid oxide fuel cells based on SDC‐ 30 wt% (53 mol% Li 2 CO 3 :47 mol% Na 2 CO 3 ) composite electrolyte in this work. SDC is prepared by the combined citrate and EDTA complexing method. X‐ray powder diffraction shows that it forms a well‐cubic fluorite structure after being sintered at 700°C for 2 h. The particle is about 12 nm detected by the transmission electron microscopy. Conductivity for the composite is much higher than the pure SDC at comparable temperatures. A transition of ionic conductivity occurs at 450°C for the composite electrolyte. The single cells are fabricated by a simple dry‐pressing process and tested at 450–600°C. A maximum power density of 900 mW cm −2 and the open‐circuit voltage of 0.92 V are achieved at 600°C. The conduction mechanism has been discussed by comparing the conductivity of composite electrolyte under different conditions. AC impedance for single cell indicates that the electrochemical process involving cathode and anode reactions is the rate‐limiting step. Copyright © 2009 John Wiley & Sons, Ltd.