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Title: A bulk-heterostructure nanocomposite electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for low-temperature solid oxide fuel cells
Authors: Cai, Yixiao
Chen, Yang
Akbar, Muhammad
Jin, Bin
Tu, Zhengwen
Mushtaq, Naveed
Wang, Baoyuan
Qu, Xiangyang
Xia, Chen
Huang, Yizhong
Keywords: Engineering::Materials
Issue Date: 2021
Source: Cai, Y., Chen, Y., Akbar, M., Jin, B., Tu, Z., Mushtaq, N., Wang, B., Qu, X., Xia, C. & Huang, Y. (2021). A bulk-heterostructure nanocomposite electrolyte of Ce0.8Sm0.2O2-δ–SrTiO3 for low-temperature solid oxide fuel cells. Nano-Micro Letters, 13(1), 46-.
Journal: Nano-Micro Letters
Abstract: Since colossal ionic conductivity was detected in the planar heterostructures consisting of fluorite and perovskite, heterostructures have drawn great research interest as potential electrolytes for solid oxide fuel cells (SOFCs). However, so far, the practical uses of such promising material have failed to materialize in SOFCs due to the short circuit risk caused by SrTiO3. In this study, a series of fluorite/perovskite heterostructures made of Sm-doped CeO2 and SrTiO3 (SDC–STO) are developed in a new bulk-heterostructure form and evaluated as electrolytes. The prepared cells exhibit a peak power density of 892 mW cm−2 along with open circuit voltage of 1.1 V at 550 °C for the optimal composition of 4SDC–6STO. Further electrical studies reveal a high ionic conductivity of 0.05–0.14 S cm−1 at 450–550 °C, which shows remarkable enhancement compared to that of simplex SDC. Via AC impedance analysis, it has been shown that the small grain-boundary and electrode polarization resistances play the major roles in resulting in the superior performance. Furthermore, a Schottky junction effect is proposed by considering the work functions and electronic affinities to interpret the avoidance of short circuit in the SDC–STO cell. Our findings thus indicate a new insight to design electrolytes for low-temperature SOFCs.
ISSN: 2311-6706
DOI: 10.1007/s40820-020-00574-3
Rights: © 2021 The Author(s). Open Access. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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