Investigation of the stability of Co-doped apatite ionic conductors in NH3
Investigation of the stability of Co-doped apatite ionic conductors in NH3
复制标题
共掺杂磷灰石离子导体在NH3中的稳定性研究
DOI:
10.1016/j.jssc.2010.08.033
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发表时间:
2010
影响因子:
3.3
通讯作者:
Headspith D
中科院分区:
文献类型:
--
作者:
Headspith D
Hydrogen powered solid oxide fuel cells (SOFCs) are of enormous interest as devices for the efficient and clean production of electrical energy. However, a number of problems linked to hydrogen production, storage and transportation are slowing down the larger scale use of SOFCs. Identifying alternative fuel sources to act as intermediate during the transition to the full use of hydrogen is, therefore, of importance. One excellent alternative is ammonia, which is produced on a large scale, is relatively cheap and has the infrastructure for storage and transportation already in place. However, considering that SOFCs operate at temperatures higher than 500 °C, a potential problem is the interaction of gaseous ammonia with the materials in the cathode, anode and solid electrolyte. In this paper, we extend earlier work on high temperature reactions of apatite electrolytes with NH3 to the transition metal (Co) doped systems, La9.67Si5CoO26 and La10(Si/Ge)5CoO26.5. A combination of PXRD, TGA and XAFS spectroscopy data showed a better structural stability for the silicate systems. Apatite silicates and germanates not containing transition metals tend to substitute nitride anions for their interstitial oxide anions, when reacted with NH3 at high temperature and, consequentially, lower the interstitial oxide content. In La9.67Si5CoO26 and La10(Si/Ge)5CoO26.5 reduction of Co occurs as a competing process, favouring lower levels of nitride¿oxide substitution.
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DOI:
10.1107/s0108768107024317
发表时间:
2007-08-01
期刊:
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE
影响因子:
--
作者:
Pramana, Stevin S.;Klooster, Wim T.;White, T. J.
通讯作者:
White, T. J.
影响因子:
9.2
作者:
N. Maffei;L. Pelletier;J. Charland;A. McFarlan
通讯作者:
N. Maffei;L. Pelletier;J. Charland;A. McFarlan
影响因子:
8.6
作者:
F. Cheng;S. Kelly;N. A. Young;Christopher N. Hope;Katie M Beverley;M. G. Francesconi;S. Clark;J. S. Bradley;F. Lefebvre
通讯作者:
F. Lefebvre
DOI:
--
发表时间:
2007
期刊:
Solid State Ionics 178
影响因子:
--
作者:
上野俊吉;中嶋英雄;福田 功一郎;村上 英興;上野俊吉;福田 功一郎;橋本 忍;上野俊吉・中嶋英雄;H. Murakami;武田 はやみ;上野俊吉・林礼明・中嶋英雄;Kiminori Sato;岩田 知之
通讯作者:
岩田 知之
影响因子:
2.7
作者:
H. O’Neill
通讯作者:
H. O’Neill