Intermediate Temperature Steam Electrolysis Using Doped Lanthanum Gallate Solid Electrolyte (2) Effects of CeO2 Interlayer on Activity

2007 ◽  
pp. 1005-1008
Author(s):  
Nitiphong Jirathiwathanakul ◽  
Hiroshige Matsumoto ◽  
Tatsumi Ishihara
Keyword(s):  
Solid Electrolyte ◽  
Intermediate Temperature ◽  
Lanthanum Gallate

Intermediate Temperature Steam Electrolysis Using Doped Lanthanum Gallate Solid Electrolyte (2) Effects of CeO2 Interlayer on Activity

2007 ◽  
Vol 544-545 ◽  
pp. 1005-1008 ◽  
Author(s):  
Nitiphong Jirathiwathanakul ◽  
Hiroshige Matsumoto ◽  
Tatsumi Ishihara
Keyword(s):  
Solid Electrolyte ◽  
Formation Rate ◽  
Recovery Process ◽  
Intermediate Temperature ◽  
Lanthanum Gallate ◽  
Diffusion Resistance ◽  
Electrolysis Condition ◽  
New Energy ◽  
H2 Formation ◽  
Wasted Heat

Steam electrolysis is attracting much interest method to produce hydrogen and also the new energy recovery process of wasted heat energy. Up to now, Y2O3 stabilized ZrO2 (YSZ) has been used for a solid electrolyte and so the operating temperature is limited down to 1273K. This study is focused on increasing the performance of steam electrolysis by using LaGaO3 based oxide for electrolyte at intermediate temperature of 873 K, which is upper limit of the obtainable wasted heat. It was found that the formation amount of H2 is almost obeyed the Faraday law up to 1.8 V suggesting that the ionic transport number of oxide ion in LaGaO3 was kept to be 1 under the steam electrolysis condition. The electrolyzing current is improved as following order; La0.6Sr0.4CoO3<Sm0.5Sr0.5CoO3<< Ba0.6La0.4CoO3 for anode and Pt<Ni<Ni-Fe for cathode, respectively. Hydrogen production rate higher than 100 μmol ml-1 min-1 at 873 K and 300 mA cm-2 were successfully demonstrated at 1.8 V in this study. Electrolysis reaction under various reaction conditions are also presented. The H2 formation rate increased with increasing total flow rate due to the diffusion resistance.

Demonstration of high efficiency intermediate-temperature solid oxide fuel cell based on lanthanum gallate electrolyte

2006 ◽  
Vol 408-412 ◽  
pp. 512-517 ◽  
Author(s):  
Toru Inagaki ◽  
Futoshi Nishiwaki ◽  
Jirou Kanou ◽  
Satoru Yamasaki ◽  
Kei Hosoi ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Solid Oxide Fuel Cell ◽  
High Efficiency ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Lanthanum Gallate ◽  
Oxide Fuel

scholarly journals Preparation and Conductivity Studies of La9.33Si6O26 (LSO) -Ce0.85Gd0.15O1.925 (CGO15) Composite Based Electrolyte for IT-SOFC

2018 ◽  
Vol 34 (4) ◽  
pp. 2125-2130
Author(s):  
Atiek Rostika Noviyanti ◽  
Iwan Hastiawan ◽  
Diana Rakhmawaty Eddy ◽  
Muhammad Berlian Adham ◽  
Arie Hardian ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Operating Temperature ◽  
Weight Ratio ◽  
Solid State Reaction Method ◽  
Intermediate Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Intermediate Temperature Range ◽  
Oxide Ion Conductors ◽  
Oxide Ion

Reducing a high-operating temperature of solid oxide fuel cell (SOFC) to intermediate temperature SOFC (IT-SOFC, 500-750ºC) poses a great challenge in the sense of developing solid electrolyte at intermediate temperature range. In response to this, we report a novel composite La9.33Si6O26 (LSO) - Ce0.85Gd0.15O1.925 (CGO) in this study. The synthesis of LSO-CGO composite was carried out by combining LSO with CGO (9:1, 8:2, and 7:3 in weight ratio) using solid state reaction method. In order to get a dense pellet, all of the products were sintered at 1500°C for 3 h. The X-ray diffraction pattern of sintered pellets show typical patterns for both of LSO and CGO which indicate that the composite was successfully formed. The highest conductivity was detected in 7LSO-3CGO, i.e. 2.10×10-3 S cm-1 at 700 ○C and also has low activation energy (0.60 eV). This result suggests that the LSO-YSZ composites are good oxide ion conductors and may potentially be used as an alternative solid electrolyte in IT-SOFC technology.

Structural and conductivity characteristics of Bi4MgxV2−xO11−δ (0⩽x⩽0.3) as solid electrolyte for intermediate temperature SOFC application

2014 ◽  
Vol 589 ◽  
pp. 29-36 ◽  
Author(s):  
Deni S. Khaerudini ◽  
Guoqing Guan ◽  
Peng Zhang ◽  
Xiaogang Hao ◽  
Yutaka Kasai ◽  
...  
Keyword(s):  
Solid Electrolyte ◽  
Intermediate Temperature
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