Investigation of electrical and mechanical properties of 3YSZ/8YSZ composite electrolytes

Ghatee, Mojtaba; Shariat, M.H.; Irvine, John T. S.

doi:10.1016/j.ssi.2008.10.006

Cited by 81 publications

(60 citation statements)

References 32 publications

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“…The conductivity values of YSZ, BCV, and YSZBCV composite samples in the temperature range 400800°C under wet air conditions are shown in Figure 3. The conductivity of YSZ and BCV was comparable to the literature data: 15,22 The conductivity of BCV at 700°C has been reported to be 56 times higher than that of YSZ under the same conditions. More importantly, the conductivity of the YSZBCV composite samples was very close to that of YSZ.…”

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confidence: 86%

Low-temperature Sintering of Yttria-stabilized Zirconia Using Bismuth–Vanadium Oxide as a Sintering Aid at 800 °C

2014

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The effect of the addition of copper-doped bismuth vanadium oxide to yttria-stabilized zirconia (YSZ) on the sinterability and electrical conductivity, especially in reducing atmospheres, has been investigated. When Bi 2 Cu 0.1 V 0.9 O 5.35 was used as a sintering aid, the sintering temperature could be reduced to 800°C, whereas the conventional sintering process requires temperatures above 1300°C. Although the conductivity of YSZ with 1.5 mol % Bi 2 Cu 0.1 V 0.9 O 5.35 was slightly lower than that of pure YSZ sintered at 1300°C, no P O2 dependence was observed under reducing conditions (e.g., P O2 = 10 ¹5 10¹24 atm), which indicates that the electrolyte is applicable to solid-oxide fuel cells.Solid-oxide fuel cells (SOFCs) have been receiving increasing attention as environmentally friendly energy sources.1 These devices are constructed from a dense zirconia-based electrolyte with two electrodes, where yttria-stabilized zirconia (YSZ) is the most widely used electrolyte.2 YSZ electrolytes are conventionally synthesized by a high-temperature sintering process that requires temperatures above 1300°C.3,4 Such high-temperature sintering not only prevents the use of less heat-resistant materials but also leads to an energy-inefficient production process. Considering that SOFCs usually operate at 700°C, 800°C would be an ideal sintering temperature for YSZ. The sintering temperature of YSZ is generally reduced by using sintering aids. Zinc oxide, 5 calcium oxide, 6 copper oxide, 7 and alumina 8 are known as effective sintering aids; however, their effect is limited to about 100200°C. 9 The addition of bismuth oxide improves the sinterability of YSZ 10 and decreases the sintering temperature to 900°C.11 Unfortunately, the reduction of bismuth oxide to bismuth metal in reducing atmospheres leads to the deposition of bismuth on the surface, which degrades the ionic conductivity 2,12 and causes the electrolyte to become completely dysfunctional. Abraham et al. have reported that bismuth vanadium oxide, Bi 4 V 2 O 11 , shows a high oxide ionic conductivity. 13 In particular, the conductivity of Bi 2 Cu 0.1 V 0.9 O 5.35 (BCV) is ca. 0.12 S cm ¹1 at 600°C. 14 Thus, because of its high ionic conductivity and low melting point, the use of this material as a sintering aid would be expected to lower the sintering temperature of YSZ without any metallic bismuth deposition.In this letter, we report the sinterability of a YSZBCV composite powder and its electrochemical properties; in particular, its conductivity under reducing conditions. The results obtained for this YSZBCV composite are compared with those for conventional YSZ sintered at 1300°C for 10 h. The optimization of the BCV-to-YSZ ratio and the application of BCV to other oxide-ion conducting materials, e.g., Ce 0.8 Gd 0.2 O 0.9 , BaZr 0.8 -Y 0.2 O 2.9 , and BaCe 0.8 Y 0.2 O 2.9 , are among our future goals.The YSZBCV composite samples were prepared as follows. Partially stabilized zirconia with 8 mol % yttria (Tosoh, TZ-8Y, crystallite size: 25 nm) was used as-purchase...

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confidence: 86%

Low-temperature Sintering of Yttria-stabilized Zirconia Using Bismuth–Vanadium Oxide as a Sintering Aid at 800 °C

2014

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“…The calculated cell resistance from the IeV curve above 1.4 V was approximately 10 U cm 2 , whereas the cell resistance was much larger and reached w100 U cm 2 at low voltages. The expected ionic resistance of such a YSZ pellet was approximately 6 U cm 2 at 700 C [20], which indicates that the ionic resistance of the YSZ electrolyte largely contributed to the total cell resistance at higher potentials, while the electrode polarization resistance dominated the total cell resistance at low voltages. The final current density of the solid oxide electrolyzer reached w90 mA cm À2 with an applied voltage of 2 V at 700 C.…”

Section: Methodsmentioning

confidence: 97%

Electrolysis of H2O and CO2 in an oxygen-ion conducting solid oxide electrolyzer with a La0.2Sr0.8TiO3+δ composite cathode

Gan

et al. 2012

Journal of Power Sources

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“…1,000°C). As it has been shown by Ghatee et al [2], the addition of 3YSZ material to 8YSZ results in decrease of electrical conductivity with simultaneous improvement of toughness and fracture strength of composite above 550°C. Incorporation of some dopants can improve properties of YSZ materials.…”

Section: Introductionmentioning

confidence: 68%

Properties of Ni/YSZ cermet materials with addition of Al2O3

Drożdż

Wyrwa

Rękas

2013

J Therm Anal Calorim

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The composite anode material for solid oxide fuel cell (SOFC) based on Ni/3YSZ (where 3YSZ means 3 mol% Y 2 O 3 in ZrO 2 ) has been prepared (by means of modified citric method) and studied (structure, microstructure and electrical properties). In order to improve ionic conductivity of 3YSZ, Al 2 O 3 was added at a synthesis stage to cermet material. The application of co-precipitation synthesis method results in obtaining uniform, nanometric powders. The methods of thermal analysis (TG/DTA/EGA and dilatometry) were used to determine thermal treatment of samples and to study mechanical compatibility of electrolyte and cermet anode material. The results of electrical properties measurements show that the addition of small amount of Al 2 O 3 to 3YSZ causes its conductivity improvement and this effect is strongest for the smallest amount of Al 2 O 3 .

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Investigation of electrical and mechanical properties of 3YSZ/8YSZ composite electrolytes

Cited by 81 publications

References 32 publications

Low-temperature Sintering of Yttria-stabilized Zirconia Using Bismuth–Vanadium Oxide as a Sintering Aid at 800 °C

Low-temperature Sintering of Yttria-stabilized Zirconia Using Bismuth–Vanadium Oxide as a Sintering Aid at 800 °C

Electrolysis of H2O and CO2 in an oxygen-ion conducting solid oxide electrolyzer with a La0.2Sr0.8TiO3+δ composite cathode

Properties of Ni/YSZ cermet materials with addition of Al2O3

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