scholarly journals Effects of (Li-Na)2CO3 on The Electrical Properties of Calcia-Stabilized Zirconia/Carbonate Composite Electrolytes

2022 ◽  
Vol 334 ◽  
pp. 04014
Author(s):  
Aiman Iqbal ◽  
Pramujo Widiatmoko ◽  
Hary Devianto
Keyword(s):  
Fuel Cell ◽  
Ionic Conductivity ◽  
Sintering Temperature ◽  
Low Cost ◽  
Fluorite Structure ◽  
Carbonate Content ◽  
Stabilized Zirconia ◽  
Oxygen Conductivity ◽  
Fuel Cell Performance ◽  
Oxygen Ion

Calcia-Stabilized Zirconia (CSZ) is potential as low-cost electrolytes material for Solid oxide fuel cell (SOFC). It is fluorite structure widely known as oxygen ion conductors. Addition of carbonate salt into fluorite-based electrolyte is common to overcome low conductivity of CSZ as well as to decrease sintering temperature. Increase of ionic conductivity in the SOFC electrolyte is also influenced by presence of protons (H+), so it is called mixed-ion electrolytes. In this study, the effect of sintering temperature and carbonate content prepared from mixture of Li2CO3 and Na2CO3 on the relative density, ionic conductivity and microstructure of electrolyte and fuel cell performance was investigated. The sintered CSZ/carbonate samples were examined physically and electrochemically by using SEM, TEM, XRD, and EIS. The unique detail of nanostructure for CSZ/carbonate was investigated by TEM. The XRD is to observed peak associating with CSZ, Li2CO3, and Na2CO3, as well as its crystallinity. Moreover, the electrolyte resistance was measured by EIS so that the proton conductivity and oxygen conductivity of CSZ/carbonate can be calculated. The improvement of low-cost electrolyte material such as CSZ can be realized by providing protons pathway.

Performance Investigation of Dual Layer Yttria-Stabilized Zirconia–Samaria-Doped Ceria Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

2016 ◽  
Vol 13 (1) ◽  
Author(s):  
Ryan J. Milcarek ◽  
Kang Wang ◽  
Michael J. Garrett ◽  
Jeongmin Ahn
Keyword(s):  
Fuel Cell ◽  
Buffer Layer ◽  
Sintering Temperature ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Cell Performance ◽  
Doped Ceria ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Fuel Cell Performance

The performance of yttria-stabilized zirconia (YSZ)–samaria-doped ceria (SDC) dual layer electrolyte anode-supported solid oxide fuel cell (AS-SOFC) was investigated. Tape-casting, lamination, and co-sintering of the NiO–YSZ anode followed by wet powder spraying of the SDC buffer layer and BSCF cathode was proposed for fabrication of these cells as an effective means of reducing the number of sintering stages required. The AS-SOFC showed a significant fuel cell performance of ∼1.9 W cm−2 at 800 °C. The fuel cell performance varies significantly with the sintering temperature of the SDC buffer layer. An optimal buffer layer sintering temperature of 1350 °C occurs due to a balance between the YSZ–SDC contact and densification at low sintering temperature and reactions between YSZ and SDC at high sintering temperatures. At high sintering temperatures, the reactions between YSZ and SDC have a detrimental effect on the fuel cell performance resulting in no power at a sintering temperature of 1500 °C.

Effects of 8mol% yttria-stabilized zirconia with copper oxide on solid oxide fuel cell performance

2015 ◽  
Vol 41 (6) ◽  
pp. 7982-7988 ◽  
Author(s):  
Jin Goo Lee ◽  
Ok Sung Jeon ◽  
Kwang Hyun Ryu ◽  
Myeong Geun Park ◽  
Sung Hwan Min ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Copper Oxide ◽  
Solid Oxide Fuel Cell ◽  
Solid Oxide ◽  
Yttria Stabilized Zirconia ◽  
Cell Performance ◽  
Oxide Fuel ◽  
Stabilized Zirconia ◽  
Fuel Cell Performance

Structural Characterization and Ionic Conductivity of Metastable Gd2(Ti0.65Zr0.35)2O7 Powders Prepared by Mechanical Milling

2006 ◽  
Vol 972 ◽  
Author(s):  
Antonio F. Fuentes ◽  
Karla J. Moreno ◽  
Jacobo Santamaria ◽  
Carlos Leon ◽  
Ulises Amador
Keyword(s):  
Ionic Conductivity ◽  
Mechanical Milling ◽  
Sintering Temperature ◽  
Ion Dynamics ◽  
Conductivity Relaxation ◽  
Electrical Conductivity Relaxation ◽  
Ion Interactions ◽  
Oxygen Ion ◽  
Fluorite Type ◽  
Powder Phase

AbstractWe analyze in this work the influence of ordering on the oxygen ion dynamics in the ionic conductor Gd2(Ti0.65Zr0.35)2O7, prepared by mechanical milling. As-prepared powder phase presents a metastable anion deficient fluorite-type of structure below 800°C becoming a disordered pyrochlore above this temperature. Such phase transformation implies a significant increase in the ionic conductivity of this material as a result of a systematic decrease in the activation energy for the dc conductivity, from 1.23 to 0.78 eV. Electrical conductivity relaxation is well described by the Kohlrausch-Williams-Watts (KWW) stretched exponential function with the fractional exponent n decreasing systematically with increasing sintering temperature (increasing ordering) as a result of decreasing ion-ion interactions in better ordered samples.

Platinum-Catalyzed Polymer Electrolyte Membrane for Fuel Cells

1999 ◽  
Vol 575 ◽  
Author(s):  
T. Jan Hwang ◽  
Hong Shao ◽  
Neville Richards ◽  
Jerome Schmitt ◽  
Andrew Hunt ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Proton Exchange Membrane ◽  
Low Cost ◽  
Polymer Electrolyte Membrane ◽  
Chemical Vapor ◽  
Proton Exchange ◽  
Fabrication Process ◽  
Membrane Electrode ◽  
Fuel Cell Performance ◽  
Electrolyte Membrane

ABSTRACTThe objective of this research is to develop the combustion chemical vapor deposition (CCVD) process for low-cost manufacture of catalytic coatings for proton exchange membrane fuel cell (PEMFC) applications. The platinum coatings as well as the fabrication process for membrane-electrode-assemblies (MEAs) were evaluated in a single testing fuel cell using hydrogen/oxygen. It was found that increasing the platinum loading from 0.05 to 0.1 mg/cm2 did not increase the fuel cell performance. The in-house MEA fabrication process needs to be improved to reduce the cell resistance. Significantly higher performance of Pt coating by the CCVD process has been obtained by MCT's fuelcell industry collaborators who are more experienced with MEA fabrication. The results can not be revealed due to confidentiality agreements.

The Research about La0.8Sr0.2CoO3 Application as Dense Diffusion Barrier in Limiting Current Oxygen Sensors

2013 ◽  
Vol 703 ◽  
pp. 111-114
Author(s):  
Yin Lin Wu ◽  
Hai Yan Zhao ◽  
Fu Shen Li
Keyword(s):  
Diffusion Barrier ◽  
Solid Electrolytes ◽  
Oxygen Sensor ◽  
Low Cost ◽  
Limiting Current ◽  
Stabilized Zirconia ◽  
Long Term Stability ◽  
Oxygen Ion ◽  
Ion Conducting

The fabrication and operation of a new thick film type of limiting current oxygen sensor is demonstrated that utilizes yttria (8% mol) stabilized zirconia (YSZ) as oxygen ion conducting solid electrolytes and dense La0.8Sr0.2CoO3(LSC) as diffusion barrier. The oxygen sensor shows a near linear response between 0 to 10.5% O2in argon at 1023K. The advantages of the sensor are simple construction, low cost and potential long term stability.

Comparative Studies Regarding the Synthesis and Characterization of Cellulose Based-Polymer Assemblies for Fuel Cell Applications

2019 ◽  
Vol 957 ◽  
pp. 475-482
Author(s):  
Ioana Maior ◽  
Ana Maria Albu ◽  
Marius Stelian Popa
Keyword(s):  
Fuel Cell ◽  
Ionic Conductivity ◽  
Comparative Studies ◽  
Electrochemical Impedance ◽  
Molecular Size ◽  
Solid Polymer ◽  
Synthesis And Characterization ◽  
Fuel Cell Performance ◽  
Vis Spectroscopy

The aim of these comparative studies consists of synthesis and characterization of membrane assemblies from cellulose acetate (CelAc) and acrylic acid (AA), using as dopant in-situ generated pyrrole–aniline (Py–AN) copolymer intended for use in fuel cells fabrication. The synthesis was conducted through free radical polymerization in a semi-homogeneous system and the casting method was used to form the solid polymer membranes. In selecting the optimal compositional parameters, the influence of the molecular size of the majority matrix component was also observed. These membrane assemblies were studied using FT-IR spectroscopy, UV-Vis spectroscopy, and X-Ray diffraction analysis which highlighted the structure–composition dependence. With the electrochemical impedance spectroscopy the ionic conductivity of the membrane was determined, in order to evaluate the PEM fuel cell performance. In case of thicker membranes, there is an increase in ionic conductivity values over those of lower thickness, which is due to short-order structural order. Also, a superunitary Py:AN is more favorable to conductivity increase than a less than one ratio.

EFFECT OF (Bi2O3)0.75(Y2O3)0.25 ADDITION ON MICROSTRUCTURES AND IONIC CONDUCTIVITIES OF CODOPED ZIRCONIA

2012 ◽  
Vol 05 (03) ◽  
pp. 1250031
Author(s):  
CHEN CHIA CHOU ◽  
CHUN FENG HUANG ◽  
TSUNG HER YEH
Keyword(s):  
Ionic Conductivity ◽  
Sintering Temperature ◽  
Ionic Conductivities ◽  
Densification Rate ◽  
Stabilized Zirconia ◽  
Zirconia Electrolyte

Variation of microstructures and ionic conductivities in (Bi2O3)0.75(Y2O3)0.25 (YSB) modified electrolyte of 8 mol% Y 2 O 3 stabilized zirconia (8YSZ) and YSB modified codoped zirconia ( ZrO 2)0.92( Y 2 O 3)0.075( MgO )0.005 (YSZM) is investigated in this work. The results demonstrated that a small amount of δ-YSB addition is effective in reducing the sintering temperature of 8YSZ from 1500 to 1200°C and promoting the densification rate of ceramics. Compared to 8YSZ electrolyte, it is interesting that a very limited amount of monoclinic ZrO2 was observed due to the MgO stabilizer in YSB modified codoped zirconia electrolyte. Besides, enhancement of ionic conductivity in δ-YSB modified codoped zirconia is evidently increased by 67% in comparison to the specimen of 8YSZ electrolyte.

Sintering and Electrical Properties of Ce0.8Sm0.2O1.9 Solid Electrolyte Modified by Addition of MnO2

2011 ◽  
Vol 197-198 ◽  
pp. 610-616 ◽  
Author(s):  
Yi Feng Zheng ◽  
Lu Cun Guo
Keyword(s):  
Ionic Conductivity ◽  
Boundary Behavior ◽  
Sintering Temperature ◽  
Fluorite Structure ◽  
X Ray Diffraction ◽  
Marked Influence ◽  
X Ray ◽  
Lower Activation ◽  
Addition Amount ◽  
Lower Activation Energy

The effect of MnO2 addition (0–2.0 mol%) on the densification, crystal structure, and ionic conductivity of Ce0.8Sm0.2O1.9 (SDC) was studied. The addition of MnO2 promotes densification, reducing sintering temperature by ~150°C. X-ray diffraction analysis showed that all the samples exhibit a fluorite structure. Impedance spectroscopy measurements indicated that SDC with appropriate ratio of MnO2 addition has higher ionic conductivity and lower activation energy compared with that of SDC. As the addition amount of Mn increases up to 1.0 mol% [(Ce0.8Sm0.2O1.9)0.99+(MnO2)0.01], the sample attains the highest ionic conductivity, about 35% higher than that of SDC at 600°C. In addition, Mn addition has little effect on bulk conductivity, but a marked influence on grain boundary behavior is observed.

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