Electrical conductivities of nano ionic composite based on yttrium-doped barium zirconate and palladium metal

Tong, Jianhua; Subramaniyan, Archana; Guthrey, Harvey; Clark, Daniel; Gorman, Brian P.; O’Hayre, Ryan

doi:10.1016/j.ssi.2012.01.018

Cited by 17 publications

(9 citation statements)

References 28 publications

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“…At typical operating temperatures of proton ceramic electrochemical cells (700–1000 K), Au, Pt, Pd, Ni, and Cu lead to small or negative Δφ and as such a defect enrichment layer at the contact with BaZrO 3 . This is in line with the reported increase in ionic conductivity of composites between metals (Pd or Ni) and oxides. − …”

Section: Resultssupporting

confidence: 90%

“…Moreover, Clark et al 4 reported enhanced proton conductivity in Y-and Yb-co-doped BaZrO 3 containing Ni particles. Similar results were reported by Tong et al, 5 who studied the ionic conductivity of Y-doped BaZrO 3 containing Pd nanoparticles. In a computational study of the stability of protonic defects near interfaces between metals and BaZrO 3 , Tauer et al 6 reported favorable segregation of OH O…”

Section: Introductionsupporting

confidence: 89%

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The Role of Space Charge at Metal/Oxide Interfaces in Proton Ceramic Electrochemical Cells

Saeed

Bjørheim

2020

J. Phys. Chem. C

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The contact potential and the resulting charge accumulation or depletion at the electrode/electrolyte interface are investigated for Ni and Cu group metals in contact with the stateof-the-art proton conductor acceptor-doped BaZrO 3 by firstprinciples calculations and thermodynamic modeling. The contact potential depends on the metal's work function and the defect chemical properties of the oxide, rendering it strongly temperature and atmosphere dependent. Above 900 K, most metals yield negative contact potentials and enrichment of protonic charge carriers at the electrode/electrolyte interface, facilitating charge transfer. Below 600 K, the contact potentials vary from positive to negative depending on the metal's work function. As such, higher work function metals lead to a space-charge contribution to the electrode impedance at lower temperatures. The prospects of exploiting charge accumulation (or depletion) characteristics of such interfaces are furthermore discussed with a focus on nanocomposite electrodes and solid-state electrochemical capacitors.

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Section: Resultssupporting

confidence: 90%

Section: Introductionsupporting

confidence: 89%

The Role of Space Charge at Metal/Oxide Interfaces in Proton Ceramic Electrochemical Cells

Saeed

Bjørheim

2020

J. Phys. Chem. C

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“…2E), group 3 dopants, produced microstroctures that were similar, or worse, than the BCZY63 control sample, despite having similar sintering conditions (1600 o C for 12 h). PdO is thought to create a small increase in point defect concentrations, a hypothesis which we along with others have previously proposed [14][15][16][17]. Thus we expect its grain size and density to be comparable or slightly better than the control.…”

Section: Microstructurementioning

confidence: 52%

Ionic transport modification in proton conducting BaCe0.6Zr0.3Y0.1O3−δ with transition metal oxide dopants

et al. 2016

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Proton conducting BaCe0.6Zr0.3Y0.1O3-δ (BCZY63) pellets were fabricated by the solid-state reactive sintering method whereby a small extra amount of a metal oxide additive (5 mol%) was included in the precursor mixture before sintering. The effect of the addition of six different metal oxide additives (CuO, ZnO, Fe2O3, MnO2, PdO, and Cr2O3) on the transport properties of BCZY63 was investigated. Although most additives (e.g. ZnO, Fe2O3, MnO2, Cr2O3) led to a decrease (sometimes minor) in conductivity, CuO and PdO dopants yielded an increase in total conductivity compared to the BCZY63 control. The enhancement in the total conductivity is found to be related to two factors: 1) the additive can act as a sintering aid to produce larger grain size; 2) substitutional doping of the BCZY structure by metal ions from additives can lead to increased bulk proton concentration. Due to its excellent sinterability and moderately improved proton conductivity, CuO-doped BCZY63 was subsequently applied as the dense electrolyte layer in protonic ceramic fuel cells utilizing a recently developed single firing step fabrication technique to produce high quality single cells that showed exceptional performance and long-term stability.

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“…Studies have shown increased proton conductivity in Yttrium doped Cerate and Zirconate materials in the presence of Pd. Tong et al reported a conductivity increase of 2.7X in BYZ pellets with 2 wt% Pd nanoparticles dispersed as the minor phase (7). Dispersing a small amount of Pd in the BYZ matrix leads to higher overall proton conductivity due to the high proton permeation in Pd as compared to BYZ.…”

Section: Resultsmentioning

confidence: 99%

Proton Conducting Micro-Solid Oxide Fuel Cells with Nanoscale Palladium Interlayers

Adam¹,

Ramanathan²

2015

ECS Trans.

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Thin film fuel cells with proton conducting oxide electrolytes have been fabricated and characterized. A comparison is made between fuel cells with and without Pd interlayers at the electrodeelectrolyte interface. A nearly two-fold increase in power density was observed in the performance of a thin film BYZ fuel cell by the addition of a palladium interlayer. The studies contribute to engineering improvements in thin film fuel cells and in the future could be useful to understand proton conduction in complex oxides via nanoscale selective permeation layers.

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Electrical conductivities of nano ionic composite based on yttrium-doped barium zirconate and palladium metal

Cited by 17 publications

References 28 publications

The Role of Space Charge at Metal/Oxide Interfaces in Proton Ceramic Electrochemical Cells

The Role of Space Charge at Metal/Oxide Interfaces in Proton Ceramic Electrochemical Cells

Ionic transport modification in proton conducting BaCe0.6Zr0.3Y0.1O3−δ with transition metal oxide dopants

Proton Conducting Micro-Solid Oxide Fuel Cells with Nanoscale Palladium Interlayers

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