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Title: Cathode and electrolyte materials for solid oxide fuel cells and ion transport membranes

Abstract

Novel cathode, electrolyte and oxygen separation materials are disclosed that operate at intermediate temperatures for use in solid oxide fuel cells and ion transport membranes based on oxides with perovskite related structures and an ordered arrangement of A site cations. The materials have significantly faster oxygen kinetics than in corresponding disordered perovskites.

Inventors:
; ;
Publication Date:
Research Org.:
University of Houston, Houston, TX, USA
Sponsoring Org.:
USDOE
OSTI Identifier:
1117876
Patent Number(s):
8,637,209
Application Number:
11/990,295
Assignee:
NETL
DOE Contract Number:
FC26-03NT41960
Resource Type:
Patent
Resource Relation:
Patent File Date: 2006 Aug 09
Country of Publication:
United States
Language:
English
Subject:
25 ENERGY STORAGE

Citation Formats

Jacobson, Allan J, Wang, Shuangyan, and Kim, Gun Tae. Cathode and electrolyte materials for solid oxide fuel cells and ion transport membranes. United States: N. p., 2014. Web.
Jacobson, Allan J, Wang, Shuangyan, & Kim, Gun Tae. Cathode and electrolyte materials for solid oxide fuel cells and ion transport membranes. United States.
Jacobson, Allan J, Wang, Shuangyan, and Kim, Gun Tae. 2014. "Cathode and electrolyte materials for solid oxide fuel cells and ion transport membranes". United States. doi:. https://www.osti.gov/servlets/purl/1117876.
@article{osti_1117876,
title = {Cathode and electrolyte materials for solid oxide fuel cells and ion transport membranes},
author = {Jacobson, Allan J and Wang, Shuangyan and Kim, Gun Tae},
abstractNote = {Novel cathode, electrolyte and oxygen separation materials are disclosed that operate at intermediate temperatures for use in solid oxide fuel cells and ion transport membranes based on oxides with perovskite related structures and an ordered arrangement of A site cations. The materials have significantly faster oxygen kinetics than in corresponding disordered perovskites.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2014,
month = 1
}

Patent:

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  • Methods using novel cathode, electrolyte and oxygen separation materials operating at intermediate temperatures for use in solid oxide fuel cells and ion transport membranes include oxides with perovskite related structures and an ordered arrangement of A site cations. The materials have significantly faster oxygen kinetics than in corresponding disordered perovskites.
  • A single electrochemical cell is described comprising cell segments. The cell segments comprises an annular, electronically conductive, porous, inner electrode; solid electrolyte contacting and surrounding the inner electrode; an electronically conductive, porous outer electrode contacting and surrounding the electrolyte; and an annular. An electronically conductive, interconnection member is disposed between adjacent segments, electronically connecting the inner electrode of one cell segment to the inner electrode of an adjacent cell segment. The outer electrodes are physically and electronically segmented for each other and from the inner electrodes of adjacent cell segments.
  • The electrode performance of a single solid-oxide fuel cell (SOFC) was evaluated using a 500 {micro}m thick La{sub 0.9}Sr{sub 0.1}Ga{sub 0.8}O{sub 0.3} (LSGM) as the electrolyte membrane. A doped lanthanum cobaltite, La{sub 0.6}Sr{sub 0.4}CoO{sub 3{minus}{delta}} was selected as the cathode material, and a samaria-doped ceria-NiO composite powder was used as the anode material. The spray-pyrolysis method was applied for synthesis of the starting powders of the cathode and anode. In this study, different microstructures of the cathode were obtained by varying the sintering temperature from 950 to 1200 C. High power density (the maximum power density of the cell wasmore » about 425 mW/cm{sup 2}, which is 95% of the theoretical value) of the solid oxide fuel cell at 800 C was achieved. The cell performance showed that, with a proper choice of electrode materials with optimized microstructure and LSGM as the electrolyte, a SOFC operating at temperatures T{sub op} {le} 800 is a realistic goal.« less
  • A new anode-supported SOFC material system Ni-BZCYYb|BZCYYb|PBFO is investigated, in which a cobalt-free layered perovskite oxide, PrBaFe 2O 5+δ (PBFO), is synthesized and employed as a novel cathode while the synthesized BZCYYb is used as an electrolyte. The cell is fabricated by a simple dry-pressing/co-sintering process. The cell is tested and characterized under intermediate temperature range from 600 to 700 °C with humified H 2 (~3% H 2O) as fuel, ambient air as oxidant. The results show that the open-circuit potential of 1.006 V and maximal power density of 452 mW cm -2 are achieved at 700 °C. The polarizationmore » resistance of the electrodes is 0.18 Ω cm 2 at 700 °C. Compared to BaZr 0.1Ce 0.7Y 0.1O 3-δ, the conductivity of co-doped barium zirconate–cerate BZCYYb is significantly improved. The ohmic resistance of single cell is 0.37 Ω cm 2 at 700 °C. The results indicate that the developed Ni-BZCYYb|BZCYYb|PBFO cell is a promising functional material system for SOFCs.« less