Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3−δ Proton-Conducting Ceramics

Siwei Wang; Yan Chen; Lingling Zhang; Cong Ren; Fanglin Chen; Kyle S. Brinkman

doi:10.1007/s11664-015-4078-9

Two-Step Reactive Aid Sintering of BaZr_0.8Y_0.2O_3−δ Proton-Conducting Ceramics

Siwei Wang, Yan Chen, Lingling Zhang, Cong Ren, Fanglin Chen, Kyle S. Brinkman

Materials Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Ceramic-based proton conductors enable high-temperature hydrogen economy applications such as hydrogen separation membranes, fuel cells, and steam electrolyzers. BaZr_0.8Y_0.2O_3−δ (BZY) proton-conducting oxide possesses the highest level of proton conductivity reported to date, but poor sinterability hinders its widespread utilization. In this paper, we report a two-step reactive aid sintering (TRAS) method involving the introduction of BaCO₃ and B₂O₃-Li₂O for the preparation of dense BZY ceramics sintered at 1500°C. The resulting BZY samples showed a pure perovskite structure with a dramatic increase in the relative density to 91.5%. In addition, the shrinkage during sintering was improved to 19.3% by a TRAS method as compared to 2.6% by the conventional solid date reaction method. The bulk conductivity was improved due to enhanced densification, while the grain boundary conductivity decreased due to the blocking behavior of the sintering aid resulting in a decrease in the total conductivity of the samples.

Original language	English
Pages (from-to)	4898-4906
Number of pages	9
Journal	Journal of Electronic Materials
Volume	44
Issue number	12
DOIs	https://doi.org/10.1007/s11664-015-4078-9
State	Published - Oct 14 2015

Bibliographical note

Publisher Copyright:
© 2015, The Minerals, Metals & Materials Society.

Funding

We gratefully acknowledge the financial support from the SCUREF/SRNS/DOE under Award # B139006. Y. Chen thanks the support from Materials, Science and Engineering Division, Office of Basic Energy, Sciences, Office of Science, U.S. Department of Energy. K. Brinkman acknowledges the Energy Frontier Research Center on Science Based Nano-Structure Design and Synthesis of Heterogeneous Functional Materials for Energy Systems (HeteroFoaM Center) funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences (Award No. DE-SC0001061). K. Brinkman also wishes to acknowledge a 2014 Clemson TIGER Grant on Materials and Processes for Natural Gas Utilization.

Funders	Funder number
Office of Basic Energy, Sciences
SRNS
U.S. Department of Energy	B139006
Office of Science
Basic Energy Sciences	DE-SC0001061
South Carolina Universities Research and Education Foundation
Division of Materials Sciences and Engineering

Keywords

Proton conductor
sinterability
sintering aid
solid oxide fuel cells
solid-state reactive sintering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1007/s11664-015-4078-9

Cite this

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title = "Two-Step Reactive Aid Sintering of BaZr0.8Y0.2O3−δ Proton-Conducting Ceramics",

abstract = "Ceramic-based proton conductors enable high-temperature hydrogen economy applications such as hydrogen separation membranes, fuel cells, and steam electrolyzers. BaZr0.8Y0.2O3−δ (BZY) proton-conducting oxide possesses the highest level of proton conductivity reported to date, but poor sinterability hinders its widespread utilization. In this paper, we report a two-step reactive aid sintering (TRAS) method involving the introduction of BaCO3 and B2O3-Li2O for the preparation of dense BZY ceramics sintered at 1500°C. The resulting BZY samples showed a pure perovskite structure with a dramatic increase in the relative density to 91.5%. In addition, the shrinkage during sintering was improved to 19.3% by a TRAS method as compared to 2.6% by the conventional solid date reaction method. The bulk conductivity was improved due to enhanced densification, while the grain boundary conductivity decreased due to the blocking behavior of the sintering aid resulting in a decrease in the total conductivity of the samples.",

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N2 - Ceramic-based proton conductors enable high-temperature hydrogen economy applications such as hydrogen separation membranes, fuel cells, and steam electrolyzers. BaZr0.8Y0.2O3−δ (BZY) proton-conducting oxide possesses the highest level of proton conductivity reported to date, but poor sinterability hinders its widespread utilization. In this paper, we report a two-step reactive aid sintering (TRAS) method involving the introduction of BaCO3 and B2O3-Li2O for the preparation of dense BZY ceramics sintered at 1500°C. The resulting BZY samples showed a pure perovskite structure with a dramatic increase in the relative density to 91.5%. In addition, the shrinkage during sintering was improved to 19.3% by a TRAS method as compared to 2.6% by the conventional solid date reaction method. The bulk conductivity was improved due to enhanced densification, while the grain boundary conductivity decreased due to the blocking behavior of the sintering aid resulting in a decrease in the total conductivity of the samples.

AB - Ceramic-based proton conductors enable high-temperature hydrogen economy applications such as hydrogen separation membranes, fuel cells, and steam electrolyzers. BaZr0.8Y0.2O3−δ (BZY) proton-conducting oxide possesses the highest level of proton conductivity reported to date, but poor sinterability hinders its widespread utilization. In this paper, we report a two-step reactive aid sintering (TRAS) method involving the introduction of BaCO3 and B2O3-Li2O for the preparation of dense BZY ceramics sintered at 1500°C. The resulting BZY samples showed a pure perovskite structure with a dramatic increase in the relative density to 91.5%. In addition, the shrinkage during sintering was improved to 19.3% by a TRAS method as compared to 2.6% by the conventional solid date reaction method. The bulk conductivity was improved due to enhanced densification, while the grain boundary conductivity decreased due to the blocking behavior of the sintering aid resulting in a decrease in the total conductivity of the samples.

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