scholarly journals Yb2O3 Doped Zr0.92Y0.08O2-α(8YSZ) and Its Composite Electrolyte for Intermediate Temperature Solid Oxide Fuel Cells

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1824 ◽  
Author(s):  
Yumin Cui ◽  
Ruijuan Shi ◽  
Junlong Liu ◽  
Hongtao Wang ◽  
Huiquan Li
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Solid State Reaction Method ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Maximum Power Density ◽  
X Ray Diffraction ◽  
Excellent Performance ◽  
Composite Electrolyte ◽  
X Ray ◽  
Different Temperatures

Yb3+ and Y3+ double doped ZrO2 (8YSZ+4Yb2O3) samples were synthesized by a solid state reaction method. Moreover, 8YSZ+4Yb2O3-NaCl/KCl composites were also successfully produced at different temperatures. The 8YSZ+4Yb2O3, 8YSZ+4Yb2O3-NaCl/KCl (800 °C), and 8YSZ+4Yb2O3-NaCl/KCl (1000 °C) samples were characterized by x–ray diffraction (XRD) and scanning electron microscopy (SEM). The results showed that a dense composite electrolyte was formed at a low temperature of 800 °C. The maximum conductivities of 4.7 × 10−2 S·cm−1, 6.1 × 10−1 S·cm−1, and 3.8 × 10−1 S·cm−1 were achieved for the 8YSZ+4Yb2O3, 8YSZ+4Yb2O3-NaCl/KCl (800 °C), and 8YSZ+4Yb2O3-NaCl/KCl (1000 °C) samples at 700 °C, respectively. The logσ~log (pO2) plot result showed that the 8YSZ+4Yb2O3-NaCl/KCl (800 °C) composite electrolyte is a virtually pure ionic conductor. An excellent performance of the 8YSZ+4Yb2O3-NaCl/KCl (800 °C) composite was obtained with a maximum power density of 364 mW·cm−2 at 700 °C.

Characterization of LSCF-Based Composite and LSCF as Cathodes for Intermediate Temperature SOFCs

2012 ◽  
Vol 727-728 ◽  
pp. 657-662
Author(s):  
Reinaldo Azevedo Vargas ◽  
Everton Bonturim ◽  
Marco Andreoli ◽  
Rubens Chiba ◽  
Emília Satoshi Miyamaru Seo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Spraying ◽  
Potential Use ◽  
Scanning Electron

The (La0.60Sr0.40)(Co0.20Fe0.80)O3-δ - LSCF, (Ce0.90Gd0.10)O1.95 - CGO composites and LSCF were deposited by wet powder spraying deposition method for the purpose of investigating their potential use in Intermediate Temperature Solid Oxide Fuel Cells. The interlayers are necessary between CGO electrolytes and LSCF cathodes in order to improve the performance of these materials. LSCF particles synthesized by citrate technique were calcined at 900 °C for 4 h and, their LSCF-CGO composites and LSCF suspensions deposited on CGO substrate and, sintered in 1100 °C for 1 h, were formed pseudo-perovskite. The ceramics materials were analyzed by X-ray diffraction (XRD) and chemical composition of different half-cells layers by scanning electron microscope with energy dispersive (SEM-EDS). The results are in agreement with the literature and indicate that route studied is adequate for crystal structures formation compatible with films the 35 µm thick total for study of conductivity between the cathode and the electrolyte.

Electrical Property of Mn and Co Dopants on La3Ni2O7±δ and La2.9Sr0.1Ni2O7±δ

2010 ◽  
Vol 93-94 ◽  
pp. 566-569
Author(s):  
Wassayamon Singkha ◽  
Sutin Kuharuangrong
Keyword(s):  
Grain Size ◽  
Electrical Property ◽  
Solid Oxide Fuel Cells ◽  
Sintered Sample ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mn Content ◽  
Mn Dopant

La3Ni2O7±δ and La2.9Sr0.1Ni2O7±δ Ruddlesden-Popper nickelate were synthesized via citrate gel method. The electrical property of Mn and Co dopants on Ni site in these systems was investigated as possible cathode for solid oxide fuel cells. The result of X-ray diffraction shows the presence of La2NiO4 in La3Ni2-xMxO7±δ and La2.9Sr0.1Ni2-xMxO7±δ (M = Mn or Co) as M content increases from x = 0.1 for Mn and x = 0.2 for Co. With further increase of Mn dopant (x ≥ 0.4), LaMnO3 and La2O3 appear with La2NiO4. The grain size of sintered sample decreases as Mn content increases. However, it slightly decreases with increasing Co content. The TEC value increases with Co content. The DC four-point measurement shows a decrease in the conductivity as Co content increases for both La3Ni2-xCoxO7±δ and La2.9Sr0.1Ni2-xCoxO7±δ systems.

Studies of Half-Cell for Anode Supported SOFC after Reduction

2011 ◽  
Vol 287-290 ◽  
pp. 2511-2515 ◽  
Author(s):  
Xia Wang ◽  
Feng Hui Wang
Keyword(s):  
Residual Stress ◽  
Solid Oxide Fuel Cells ◽  
Hydrogen Reduction ◽  
Solid Oxide ◽  
X Ray Diffraction ◽  
Electrolyte Layer ◽  
Half Cell ◽  
X Ray ◽  
Stress Changes ◽  
Different Temperatures

The performance of half-cell for anode supported Solid Oxide Fuel Cells (SOFCs) is necessary to wide use of SOFCs. This work is to study the reduction degree of anode and the residual stress changes that occur during hydrogen reduction on the different temperatures and in different times. The porosity of the specimens with oxidation is less than that of the reduction one. There is no Ni phase in the sample before hydrogen reduction. After hydrogen reduction on 1000°C for 6 hours, there is no NiO phase in the sample. It reveals the NiO has been reduced into Ni completely. We also investigate residual stresses in the electrolyte layer using X-ray diffraction. The residual stress value of electrolyte is about -844.1MPa before reduction. After hydrogen reduction on 800°C for 9 hours, the residual stress is decreased to -474.8MPa. So the reduction temperature can choose as 600°C and the reduction time can choose as 9 hours.

Novel Cathodes Consisting of La3Ni2O7+δ Mixed with Ba0.5Sr0.5Co0.8Fe0.2O3-δ for Proton-Conductive Solid Oxide Fuel Cells (p-SOFCs)

2020 ◽  
Vol 304 ◽  
pp. 67-72
Author(s):  
Hung Ghun Ding ◽  
Wei Sun ◽  
Jing Chie Lin ◽  
Sheng Wei Lee ◽  
Jason Shian Ching Jang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Electron Microscope ◽  
Solid Oxide Fuel Cells ◽  
Air Transportation ◽  
Reduction Reaction ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Maximum Power Density ◽  
X Ray ◽  
Scanning Electron

This work studied on the development of novel cathodes for proton-conductive solid oxide fuel cells (p-SOFCs) made of powders La3Ni2O7+δ (LNO2) mixed with Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF). The cathodes were constructed by a skeleton of LNO2 whose surface coated by BSCF in the ratio (in wt. %) of LNO2/BSCF varying in 15/85, 30/70, 50/50, 75/25 (denote as LN15, LN30, LN50, and LN75, respectively). The skeleton was responsible for carrier conduction and air transportation; the BSCF coating was responsible for catalytic oxygen reduction reaction (ORR). Nascent powders directly collected from combustion were subject to examination by scanning electron microscope (SEM) and X-ray diffractometer (XRD) and further calcination. Well crystalized with highly pure powders obtained post their calcination at 900 °C. Performing the button cells by means of I-V testing at 600, 700 and 800°C, the data of maximum power density () depicted the order LN75 < BSCF < LN15 < LN30< LN50 regardless of temperatures. Among all the specimens, LN50 could be the best cathode candidate for P-SOFCs.

Preparation and properties of solid electrolyte CaxBi1.7−xW0.3O3.45−0.5x electrolyte material by sol–gel combution method

2019 ◽  
Vol 12 (05) ◽  
pp. 1951001
Author(s):  
Jie Yang ◽  
Changan Tian ◽  
Yu Wang ◽  
Junjie Meng ◽  
Dongdong Ji ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Combustion Method ◽  
Solid Oxide ◽  
Electrochemical Studies ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Differential Thermogravimetric Analysis

CaxBi[Formula: see text]W[Formula: see text]O[Formula: see text] (CBW) ([Formula: see text], 0.05, 0.10, 0.15, 0.20, 0.30) electrolyte material were synthesized by sol–gel self-combustion method. The samples were characterized by thermogravimetric-differential thermogravimetric analysis(TG-DSC), X-ray diffraction, scanning electron microscopy (SEM), porosity and electrochemical impedance spectroscopy (EIS). The results show the powders CaxBi[Formula: see text]W[Formula: see text]O[Formula: see text] (CBW) with fluorite crystal structure can be obtained after the precursor was calcined at 760∘C. When sintered at 780∘C for 2[Formula: see text]h, the compact ceramic sintered with relative density higher than 97% can be obtained. The electrochemical studies showed that CaxBi[Formula: see text]W[Formula: see text]O[Formula: see text] (CBW) have high ionic conductivity after 780∘C sintering. The sample Ca[Formula: see text]Bi[Formula: see text]W[Formula: see text]O[Formula: see text] exhibits a conductivity of 0.07978 S[Formula: see text][Formula: see text][Formula: see text]cm[Formula: see text] at 750∘C, and the activation energy is 0.845[Formula: see text]eV, which is expected to be applied to the electrolyte materials for intermediate temperature solid oxide fuel cells (SOFC).

Physical and Microstructural Characterization of Cathode, Composite Cathode and Electrolyte Ceramics to ITSOFC

2014 ◽  
Vol 775-776 ◽  
pp. 52-56
Author(s):  
Reinaldo Azevedo Vargas ◽  
Everton Bonturim ◽  
Marco Andreoli ◽  
Rubens Chiba ◽  
Emília Satoshi Miyamaru Seo
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Microstructural Characterization ◽  
Composite Cathode ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Powder Spraying ◽  
Potential Use

The (La0.60Sr0.40)(Co0.20Fe0.80)O3-δ - LSCF, (Ce0.90Gd0.10)O1.95 - CGO composites and LSCF were deposited by wet powder spraying deposition method for the purpose of investigating their potential use in Intermediate Temperature Solid Oxide Fuel Cells. The interlayers are necessary between CGO electrolytes and LSCF cathodes in order to improve the performance of these materials. LSCF powders synthesized by citrate technique were calcined at 900 °C for 4 h and, their LSCFCGO composites and LSCF suspensions deposited on CGO substrate and, sintered in 1100 °C for 1 h, were formed pseudo-perovskite. The ceramics materials were analyzed by X-ray diffraction (XRD) and chemical composition of different half-cells layers by scanning electron microscope with energy dispersive (SEM-EDS). The results are in agreement with the literature and indicate that route studied is adequate for crystal structures formation compatible with films the 35 μm thick total for study of conductivity between the cathode and the electrolyte.

BaZn2Si2O7 and the solid solution series BaZn2−xCoxSi2O7 (0

2013 ◽  
Vol 207 ◽  
pp. 55-60 ◽  
Author(s):  
Marita Kerstan ◽  
Christian Thieme ◽  
Matthias Grosch ◽  
Matthias Müller ◽  
Christian Rüssel
Keyword(s):  
Solid Solution ◽  
Fuel Cells ◽  
High Temperature ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Solid Solution Series ◽  
X Ray Diffraction ◽  
X Ray ◽  
Solution Series

Preparation and Investigation of Cu Doped(Pr0.5Nd0.5)0.7Ca0.3CrO3–δ Ceramic Interconnect Materials

2013 ◽  
Vol 448-453 ◽  
pp. 2950-2958
Author(s):  
Qing Wen Gu ◽  
Yong Hong Chen ◽  
Dong Tian ◽  
Xiao Yong Lu ◽  
Yan Zhi Ding ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray Diffraction ◽  
Cu Doping ◽  
X Ray ◽  
New Phase ◽  
Interconnect Material ◽  
Scanning Electron ◽  
Ceramic Interconnect

(Pr0.5Nd0.5)0.7Ca0.3Cr1-xCuxO3–δ(PNCCCx x=0, 0.5, 0.1, 0.15，0.2 ) interconnect material and electrolyte powders of Sm0.2Ce0.8O1.9 (SDC) were synthesized by citric acid nitrates self-propagating combustion methodThe phase and microstructure of the sintering samples were investigated by X-ray diffraction and scanning electron microscope, respectively. The electrical conductivity of the samples were measured by four-probe technique. The results indicated that there is no new-phase were detected after co-firing between Cu-doping PNCC and SDC at 1350°C for 5 h. In air or H2 atmosphere, the conductivity of the sintering ceramics increasing with temperature, as well as the Cu-doped contents. At 800°C, the conductivity for PNCCC0.05 reached 37.54S/cm in air, and the maximum of PNCCC/SDC reached 44.52 S/cm in air 30.68 S/cm in H2, respectively. The average thermal expansion coefficient of the series ceramics is between10.4×10-6 K-1 to 10.8×10-6K-1 at the RT-1000°C, which is close to that of the SDC electrolyte. Our results indicate that the PNCCC compounds is a very promising interconnect material for intermediate solid oxide fuel cells.

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