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Terbium and Tungsten Co-doped Bismuth Oxide Electrolytes for Low Temperature Solid Oxide Fuel Cells
정도원,이강택,Eric D. Wachsman 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.4
We developed a novel double dopant bismuth oxide system with Tb and W. When Tb was doped as a single dopant, a Tb dopantconcentration more than 20 mol% was required to stabilize bismuth oxides with a high conductivity cubic structure. Hightemperature XRD analysis of 25 mol% Tb-doped bismuth oxide (25TSB) confirmed that the cubic structure of 25TSB wasretained from room temperature to 700oC with increase in the lattice parameter. On the other hand, we achieved the stabilizationof high temperature cubic phase with a total dopant concentration as low as ~12 mol% with 8 mol% Tb and 4 mol% W doubledopants (8T4WSB). Moreover, the measured ionic conductivity of 10T5WSB was much higher than 25TSB, thusdemonstrating the feasibility of the double dopant strategy to develop stabilized bismuth oxide systems with higher oxygen ionconductivity for the application of SOFC electrolytes at reduced temperature. In addition, we investigated the long-term stabilityof TSB and TWSB electrolytes.
Jung, Doh Won,Lee, Kang Taek,Wachsman, Eric D. The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.5
<P>Herein, we developed a novel double dopant bismuth oxide electrolyte system with dysprosium (Dy) and gadolinium (Gd). The effect of the co-dopants on phase stability and electrical properties was investigated. Phase transformation from cubic to rhombohedral was observed as Gd dopant concentration increased and consequently resulted in conductivity degradation. The stabilization of high temperature cubic phase was achieved with a total dopant concentration as low as similar to 12 mol% with 8 mol% Dy and 4 mol% Gd double dopant composition (8D4GSB) and this composition showed one of the highest total conductivity reported at this low temperature regime. In addition, the long-term stability of DGSB electrolytes was investigated. (C) The Author(s) 2016. Published by ECS. All rights reserved.</P>
Terbium and Tungsten Co-doped Bismuth Oxide Electrolytes for Low Temperature Solid Oxide Fuel Cells
Jung, Doh Won,Lee, Kang Taek,Wachsman, Eric D. The Korean Ceramic Society 2014 한국세라믹학회지 Vol.51 No.4
We developed a novel double dopant bismuth oxide system with Tb and W. When Tb was doped as a single dopant, a Tb dopant concentration more than 20 mol% was required to stabilize bismuth oxides with a high conductivity cubic structure. High temperature XRD analysis of 25 mol% Tb-doped bismuth oxide (25TSB) confirmed that the cubic structure of 25TSB was retained from room temperature to $700^{\circ}C$ with increase in the lattice parameter. On the other hand, we achieved the stabilization of high temperature cubic phase with a total dopant concentration as low as ~12 mol% with 8 mol% Tb and 4 mol% W double dopants (8T4WSB). Moreover, the measured ionic conductivity of 10T5WSB was much higher than 25TSB, thus demonstrating the feasibility of the double dopant strategy to develop stabilized bismuth oxide systems with higher oxygen ion conductivity for the application of SOFC electrolytes at reduced temperature. In addition, we investigated the long-term stability of TSB and TWSB electrolytes.
전극평형전위차 가스 센싱 메커니즘을 적용한 일산화탄소 소형 전위차센서의 특성 향상에 관한 연구
박준영,김지현,박가영,Park, Jun-Young,Kim, Ji-Hyun,Park, Ka-Young,Wachsman, Eric D. 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.1
Based on the differential electrode equilibria approach, potentiometric YSZ sensors with semiconducting oxide electrodes for CO detection are developed. To improve the selectivity, sensitivity and response-time of the sensor, our strategy includes (a) selection of an oxide with a semiconducting response to CO, (b) addition of other semiconducting materials, (c) addition of a catalyst (Pd), (d) utilization of combined p- and n-type electrodes in one sensor configuration, and (e) optimization of operating temperatures. Excellent sensing performance is obtained by a novel device structure incorporating $La_2CuO_4$ electrodes on one side and $TiO_2$-based electrodes on opposite substrate faces with Pt contacts. The resulting response produces additive effects for the individual $La_2CuO_4$ and $TiO_2$-based electrodes voltages, thereby realizing an even higher CO sensitivity. The device also is highly selective to CO versus NO with minor sensitivity for NO concentration, compared to a notably large CO sensitivity.
Joh, Dong Woo,Park, Jeong Hwa,Kim, Doyeub,Wachsman, Eric D.,Lee, Kang Taek American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.10
<P>A functionally graded Bi1.6.Er0.4O3(ESB)/Y0.16Zr0.84O1.92(YSZ) bilayer electrolyte is successfully developed via a cost-effective screen printing process using nanoscale ESB powders on the tape-cast NiO-YSZ anode support. Because of the highly enhanced oxygen incorporation process at the cathode/electrolyte interface, a novel bilayer solid oxide fuel cell (SOFC) yields extremely high power density of similar to 2.1 W cm(-2) at 700 degrees C, which is a 2.4 times increase compared to that of the YSZ single electrolyte SOFC.</P>
Lim, D.-K.,Choi, M.-B.,Lee, K.-T.,Yoon, H.-S.,Wachsman, E.D.,Song, S.-J. Elsevier 2011 International journal of hydrogen energy Vol.36 No.15
<P><B>Abstract</B></P> <P>The electrical and relaxation properties of Y-doped barium cerate (BaCe<SUB>0.85</SUB>Y<SUB>0.15</SUB>O<SUB>3−δ</SUB>; BCY) were studied as a function of both <SUB> P <SUB> O 2 </SUB> </SUB> and <SUB> P <SUB> H 2 </SUB> O </SUB> in the temperature range of 600–900 °C. The partial conductivities of protons, holes, and oxygen vacancies were successfully calculated, and the activation energy determined for proton transport was 0.29 eV. Twofold non-monotonic conductivity relaxation behaviors were clearly confirmed in the temperature range of 700 ∼ 800 °C during hydration/dehydration. The hydrogen chemical diffusivity at a fixed oxygen partial pressure ( <SUB> P <SUB> O 2 </SUB> </SUB> ), <SUB> D ˜ iH </SUB> , was greater than that of <SUB> D ˜ vH </SUB> , i.e., the oxygen chemical diffusivity at a fixed <SUB> P <SUB> O 2 </SUB> </SUB> , at all experimental conditions, suggesting that the hydrogen chemical diffusion is always faster than oxygen upon hydration/dehydration in the temperature range studied.</P> <P><B>Highlights</B></P> <P>► The partial conductivities of protons, holes, and oxygen vacancies with the activation energy for transport. ► The greater hydrogen chemical diffusivity than the oxygen chemical diffusivity at a fixed oxygen partial pressure ( <SUB> P <SUB> O 2 </SUB> </SUB> ). ► The faster hydrogen diffusion than oxygen upon hydration/dehydration.</P>