Molybdate Based Ceramic Negative-Electrode Materials for Solid Oxide Cells

Christopher R. Graves; Bhaskar Reddy Sudireddy; Mogens Bjerg Mogensen

doi:10.1149/1.3495841

Molybdate Based Ceramic Negative-Electrode Materials for Solid Oxide Cells

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Abstract

Novel molybdate materials with varying Mo valence were synthesized as possible negative-electrode materials for solid oxide cells. The phase, stability, microstructure and electrical conductivity were characterized. The electrochemical activity for H2O and CO2 reduction and H2 and CO oxidation was studied using simplified geometry point-contact electrodes. Unique phenomena were observed for some of the materials - they decomposed into multiple phases and formed a nanostructured surface upon exposure to operating conditions (in certain reducing atmospheres). The new phases and surface features enhanced the electrocatalytic activity and electronic conductivity. The polarization resistances of the best molybdates were two orders of magnitude lower than that of donor-doped strontium titanates. Many of the molybdate materials were significantly activated by cathodic polarization, and they exhibited higher performance for cathodic (electrolysis) polarization than for anodic (fuel cell) polarization, which makes them especially interesting for use in electrolysis electrodes. ©2010 COPYRIGHT ECS - The Electrochemical Society

Original language	English
Journal	E C S Transactions
Volume	28
Issue number	11
Pages (from-to)	173-192
ISSN	1938-5862
DOIs	https://doi.org/10.1149/1.3495841
Publication status	Published - 2010
Event	217th Electrochemical Society Meeting: B11 - Ionic and Mixed Conducting Ceramics 7 - Vancouver, Canada Duration: 25 Apr 2010 → 30 Apr 2010 Conference number: 217 http://www.electrochem.org/meetings/biannual/217/217.htm

Conference

Conference	217th Electrochemical Society Meeting
Number	217
Country/Territory	Canada
City	Vancouver
Period	25/04/2010 → 30/04/2010
Internet address	http://www.electrochem.org/meetings/biannual/217/217.htm

Bibliographical note

© The Electrochemical Society, Inc. 2010. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in ECS Transactions.

Keywords

Solid Oxide Fuel Cells
Fuel Cells and Hydrogen

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title = "Molybdate Based Ceramic Negative-Electrode Materials for Solid Oxide Cells",

abstract = "Novel molybdate materials with varying Mo valence were synthesized as possible negative-electrode materials for solid oxide cells. The phase, stability, microstructure and electrical conductivity were characterized. The electrochemical activity for H2O and CO2 reduction and H2 and CO oxidation was studied using simplified geometry point-contact electrodes. Unique phenomena were observed for some of the materials - they decomposed into multiple phases and formed a nanostructured surface upon exposure to operating conditions (in certain reducing atmospheres). The new phases and surface features enhanced the electrocatalytic activity and electronic conductivity. The polarization resistances of the best molybdates were two orders of magnitude lower than that of donor-doped strontium titanates. Many of the molybdate materials were significantly activated by cathodic polarization, and they exhibited higher performance for cathodic (electrolysis) polarization than for anodic (fuel cell) polarization, which makes them especially interesting for use in electrolysis electrodes. {\textcopyright}2010 COPYRIGHT ECS - The Electrochemical Society",

keywords = "Solid Oxide Fuel Cells, Fuel Cells and Hydrogen, Br{\ae}ndselsceller og brint",

author = "Graves, \{Christopher R.\} and \{Reddy Sudireddy\}, Bhaskar and Mogensen, \{Mogens Bjerg\}",

note = "{\textcopyright} The Electrochemical Society, Inc. 2010. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in ECS Transactions.; 217th Electrochemical Society Meeting : B11 - Ionic and Mixed Conducting Ceramics 7 ; Conference date: 25-04-2010 Through 30-04-2010",

year = "2010",

doi = "10.1149/1.3495841",

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journal = "E C S Transactions",

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T1 - Molybdate Based Ceramic Negative-Electrode Materials for Solid Oxide Cells

AU - Graves, Christopher R.

AU - Reddy Sudireddy, Bhaskar

AU - Mogensen, Mogens Bjerg

N1 - Conference code: 217

PY - 2010

Y1 - 2010

N2 - Novel molybdate materials with varying Mo valence were synthesized as possible negative-electrode materials for solid oxide cells. The phase, stability, microstructure and electrical conductivity were characterized. The electrochemical activity for H2O and CO2 reduction and H2 and CO oxidation was studied using simplified geometry point-contact electrodes. Unique phenomena were observed for some of the materials - they decomposed into multiple phases and formed a nanostructured surface upon exposure to operating conditions (in certain reducing atmospheres). The new phases and surface features enhanced the electrocatalytic activity and electronic conductivity. The polarization resistances of the best molybdates were two orders of magnitude lower than that of donor-doped strontium titanates. Many of the molybdate materials were significantly activated by cathodic polarization, and they exhibited higher performance for cathodic (electrolysis) polarization than for anodic (fuel cell) polarization, which makes them especially interesting for use in electrolysis electrodes. ©2010 COPYRIGHT ECS - The Electrochemical Society

AB - Novel molybdate materials with varying Mo valence were synthesized as possible negative-electrode materials for solid oxide cells. The phase, stability, microstructure and electrical conductivity were characterized. The electrochemical activity for H2O and CO2 reduction and H2 and CO oxidation was studied using simplified geometry point-contact electrodes. Unique phenomena were observed for some of the materials - they decomposed into multiple phases and formed a nanostructured surface upon exposure to operating conditions (in certain reducing atmospheres). The new phases and surface features enhanced the electrocatalytic activity and electronic conductivity. The polarization resistances of the best molybdates were two orders of magnitude lower than that of donor-doped strontium titanates. Many of the molybdate materials were significantly activated by cathodic polarization, and they exhibited higher performance for cathodic (electrolysis) polarization than for anodic (fuel cell) polarization, which makes them especially interesting for use in electrolysis electrodes. ©2010 COPYRIGHT ECS - The Electrochemical Society

KW - Solid Oxide Fuel Cells

KW - Fuel Cells and Hydrogen

KW - Brændselsceller og brint

U2 - 10.1149/1.3495841

DO - 10.1149/1.3495841

M3 - Conference article

SN - 1938-5862

VL - 28

SP - 173

EP - 192

JO - E C S Transactions

JF - E C S Transactions

IS - 11

T2 - 217th Electrochemical Society Meeting

Y2 - 25 April 2010 through 30 April 2010

ER -

Molybdate Based Ceramic Negative-Electrode Materials for Solid Oxide Cells

Abstract

Conference

Bibliographical note

Keywords

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