Solid-state reactive sintering mechanism for proton conducting ceramics

Nikodemski, Stefan; Tong, Jianhua; O’Hayre, Ryan

doi:10.1016/j.ssi.2013.09.025

Cited by 128 publications

(90 citation statements)

References 21 publications

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“…Corresponding lattice parameters are a = 4.2115 (3) Å for BZY and a = 3.7289 (6) Å, b = 5.8124 (6) Å, and 11.433 (2) Å for BaY 2 NiO 5 , respectively. The lattice parameters of both phases are in good agreement with the results from solid state reactive sintering [11][12][13]. The ionic radii of Ni 2+ , Zr 4+ , Y 3+ , and O 2À at sixfold coordination are 0.69 Å, 0.72 Å, 0.9 Å, and 1.4 Å, respectively, whereas that of Ba 2+ at 12-fold coordination is 1.61 Å [15].…”

Section: Methodssupporting

confidence: 80%

“…The reported sintering time of solid state reactive sintering for BZY with 2 wt.% NiO is over 10 h at 1450°C to obtain 95% relative density [11][12][13]; the preparation of dense BZY from the calcined powder using a conventional solid state reaction is hence an effective means of obtaining dense BZY. SEM micrographs of BZY discs embedded within same BZY powder sintered at 1450°C for 5 h under ambient air and O 2 are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…More recently, Tong et al [11,12] screened a number of metal oxides to enhance the densification and grain growth of BZY from BaCO 3 , ZrO 2 , and Y 2 O 3 precursors by a solid-state reactive sintering method. Among metal oxide sintering aids, NiO is the most effective one, and the mass percent of the NiO (2 wt.%) has been optimized for the densification of BZY with relative density higher than 95% [13]. It also has been found that a minor secondary phase, BaY 2 NiO 5 , is formed in addition to the BZY during solid state reactive sintering, and it acts as a sintering center without loss of proton conductivity.…”

Section: Introductionmentioning

confidence: 99%

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The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

Yoo

Yun

Joo

et al. 2015

Journal of Alloys and Compounds

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Section: Methodssupporting

confidence: 80%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

Yoo

Yun

Joo

et al. 2015

Journal of Alloys and Compounds

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“…Diffusion of Ni from the anode into BZCYYb electrolyte during this co-sintering process improves the sinterability of BZCYYb, resulting in a dense electrolyte layer without defects such as pinholes and cracks. 19)21) However, Ni diffusion generally has a negative effect for mixed ion conductors, namely, decrease in proton transport number, which leads to lower open-circuit voltage (OCV). Solid solution of Ni into the lattice of mixed ion conductors causes degradation of protonic conductivity due to decrease in proton concentration, resulting in a low proton transport number.…”

Section: )14)mentioning

confidence: 99%

Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr0.1Ce0.7Y0.1Yb0.1O3−δ

Shimada

Yamaguchi

Sumi

et al. 2017

J. Ceram. Soc. Japan

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Perovskite-type mixed protonic and oxide ionic conductors for electrolyte material of solid oxide fuel cells were investigated, focusing on BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3¹¤ (BZCYYb) due to its high ionic conductivity and chemical stability. BZCYYb and NiOadded BZCYYb were evaluated using electrolyte-supported cell (ESC) and anode-supported cell (ASC) samples. 2 wt.% NiO was solid solute into the BZCYYb, resulting in improvement in the sinterability and thermal-expansion behavior. The addition of NiO, however, lead to the deterioration of cell performance. Compared with the ESC, power density of the ASC was much higher due to thin electrolyte, whereas its open-circuit voltage (OCV) was lower. This is due to Ni diffusion from the NiOBZCYYb anode into the BZCYYb electrolyte during high-temperature co-sintering process at 1350°C. From the results of OCV measurements, 02 wt.% NiO was considered to be dissolved in the BZCYYb electrolyte of the ASC, suggesting that controlling Ni diffusion during co-sintering process is essential to achieve higher-performance ASCs using BZCYYb.

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“…In order to overcome these problems, it has been recognized that addition of small amount of transition metal (Co, Ni, Cu, Zn, etc.) as a sintering promotion agent is effective on improvement of sinterability [8] [9] [10] [11] [12]. Because Ni is used for the anode electrode material of a fuel cell [13] [14], further consideration is required to obtain the high performance fuel cell using BZ and BZ-Y electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Proton Conductivity of Ni, Y Co-Doped BaZrO3

Morishita¹,

Ikebe²,

Ban³

2018

MSCE

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Dense sintered bodies of proton conducting BaZrO 3 (BZ) and Y-doped BaZrO 3 (BZ-Y) were obtained at 1600˚C for a short sintering time of 5 hours, by the addition of NiO as a sintering promotion agent. The relative density and grain growth of samples, Ni-doped BaZrO 3 (BZ-N) and Ni, Y co-doped BaZrO 3 (BZ-NY), were increased with increasing Ni addition. The sinterability of BZ-NY was greatly improved just to add only 0.6 mol% Ni and the relative density of this sample was more than 98%, in contrast to that of 60% at most for BZ-Y without Ni addition. Electrical conductivity of BZ-NY added Ni 1.0 mol%, BaZr 0.91 Ni 0.01 Y 0.08 O 3-α , was more than 10 −3 S•cm −2 at 900˚C in a wet 1% hydrogen atmosphere, which value was 10 times higher than that of BZ-Y. In addition, the kind of electrical conduction carrier and an ionic transport number were also examined by employing various concentration cells. It was found that the proton conduction was dominant for both BZ-N and BZ-NY samples, although BZ-NY showed scarcely oxygen-ion conduction approximately 10% in a high temperature range higher than 800˚C. From these results, as mall amount of Ni addition found to be effective for improvement of both the sinterability and the electrical conductivity.

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Solid-state reactive sintering mechanism for proton conducting ceramics

Cited by 128 publications

References 21 publications

The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−δ</sub>

Proton Conductivity of Ni, Y Co-Doped BaZrO<sub>3</sub>

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Solid-state reactive sintering mechanism for proton conducting ceramics

Cited by 128 publications

References 21 publications

The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

The effects of NiO addition on the structure and transport properties of proton conducting BaZr0.8Y0.2O3−

Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3&minus;&delta;</sub>

Proton Conductivity of Ni, Y Co-Doped BaZrO&lt;sub&gt;3&lt;/sub&gt;

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Additive effect of NiO on electrochemical properties of mixed ion conductor BaZr<sub>0.1</sub>Ce<sub>0.7</sub>Y<sub>0.1</sub>Yb<sub>0.1</sub>O<sub>3−δ</sub>

Proton Conductivity of Ni, Y Co-Doped BaZrO<sub>3</sub>