CaltechAUTHORS
  A Caltech Library Service

A high-performance cathode for the next generation of solid-oxide fuel cells

Shao, Zongping and Haile, Sossina M. (2004) A high-performance cathode for the next generation of solid-oxide fuel cells. Nature, 431 (7005). pp. 170-173. ISSN 0028-0836. https://resolver.caltech.edu/CaltechAUTHORS:20131114-151729379

[img]
Preview
PDF (Supplementary Figure 1 The general operation principle of a single-chamber fuel cell using an oxygen ionic conducting electrolyte.) - Supplemental Material
See Usage Policy.

27Kb
[img]
Preview
PDF (Supplementary Figure 2 Crystal structure and phase stability of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF).) - Supplemental Material
See Usage Policy.

51Kb
[img]
Preview
PDF (Supplementary Figure 3 The performance of silver alone as a cathode for Ce0.85Sm0.15O2-delta (SDC) based fuel cells.) - Supplemental Material
See Usage Policy.

28Kb
[img]
Preview
PDF (Supplementary Figure 4 Electrochemical behaviour of an anode supported fuel cell with Sm0.5Sr0.5CoO3-delta + Ce0.85Sm0.15O2-delta (70:30%wt.) as the cathode with 3% H2O + H2 supplied to the anode and air supplied to the cathode.) - Supplemental Material
See Usage Policy.

53Kb
[img]
Preview
PDF (Supplementary Figure 5 Analysis of the contributions to the polarization drops across a Ni + SDC (700 microm) | SDC (20 microm) | BSCF (20 microm) fuel cell operated in dual chamber mode.) - Supplemental Material
See Usage Policy.

36Kb
[img]
Preview
PDF (Supplementary Figure 6 The difference between fuel cell temperature and furnace temperature in single chamber configuration using propane+oxygen mixture as feed gas.) - Supplemental Material
See Usage Policy.

19Kb
[img]
Preview
PDF (Supplementary Figure 7 Oxygen permeability measurement of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) membrane by gas chromatography method.) - Supplemental Material
See Usage Policy.

24Kb
[img]
Preview
PDF (Supplementary Figure 8 Measurement of oxygen vacancy diffusion coefficient, DV, and oxygen surface exchange coefficient, ka, from oxygen permeation studies and detailed modelling of Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF).) - Supplemental Material
See Usage Policy.

46Kb
[img]
Preview
PDF (Supplementary Figure 9 Activation energy for oxygen transportation through Ba0.5Sr0.5Co0.8Fe0.2O3-d dense membranes based simply on oxygen permeation data.) - Supplemental Material
See Usage Policy.

14Kb
[img]
Preview
PDF (Supplementary Figure 10 Influence of CO2 and H2O on the area specific resistance of the Ba0.5Sr0.5Co0.8Fe0.2O3-delta cathode.) - Supplemental Material
See Usage Policy.

42Kb
[img]
Preview
PDF (Supplementary Figure 11 Influence of cathode thickness and fabrication methods on the area specific resistivity of the Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) cathode.)
See Usage Policy.

25Kb
[img]
Preview
PDF (Supplementary Figure 12 Long term performance of fuel cells using a Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF) based cathode.) - Supplemental Material
See Usage Policy.

20Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20131114-151729379

Abstract

Fuel cells directly and efficiently convert chemical energy to electrical energy. Of the various fuel cell types, solid-oxide fuel cells (SOFCs) combine the benefits of environmentally benign power generation with fuel flexibility. However, the necessity for high operating temperatures (800–1,000 °C) has resulted in high costs and materials compatibility challenges. As a consequence, significant effort has been devoted to the development of intermediate-temperature (500–700 °C) SOFCs. A key obstacle to reduced-temperature operation of SOFCs is the poor activity of traditional cathode materials for electrochemical reduction of oxygen in this temperature regime2. Here we present Ba_(0.5_Sr_(0.5)Co_(0.8)Fe_(0.2)O_(3-delta) (BSCF) as a new cathode material for reduced-temperature SOFC operation. BSCF, incorporated into a thin-film doped ceria fuel cell, exhibits high power densities (1,010 mW cm^(-2) and 402 mW cm^(-2) at 600 °C and 500 °C, respectively) when operated with humidified hydrogen as the fuel and air as the cathode gas. We further demonstrate that BSCF is ideally suited to 'single-chamber' fuel-cell operation, where anode and cathode reactions take place within the same physical chamber. The high power output of BSCF cathodes results from the high rate of oxygen diffusion through the material. By enabling operation at reduced temperatures, BSCF cathodes may result in widespread practical implementation of SOFCs.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx/doi.org/10.1038/nature02863DOIArticle
http://www.nature.com/nature/journal/v431/n7005/abs/nature02863.htmlPublisherArticle
http://rdcu.be/coRzPublisherFree ReadCube access
ORCID:
AuthorORCID
Haile, Sossina M.0000-0002-5293-6252
Additional Information:© 2004 Nature Publishing Group. Received 25 February 2004; Accepted 25 June 2004. This work was funded by the Defense Advanced Research Projects Agency, Microsystems Technology Office. Additional support was provided by the National Science Foundation through the Caltech Center for the Science and Engineering of Materials. Selected oxygen permeability measurements were carried out in the Laboratory of Reaction Engineering and Energy, Institute of Research on Catalysis, CNRS, France, during the visit of Z.P.S. there, hosted by C. Mirodatos.
Funders:
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
NSFUNSPECIFIED
Issue or Number:7005
Record Number:CaltechAUTHORS:20131114-151729379
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20131114-151729379
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42474
Collection:CaltechAUTHORS
Deposited By: Jonathan Gross
Deposited On:18 Nov 2013 20:10
Last Modified:03 Oct 2019 05:58

Repository Staff Only: item control page