Application of a Triple-Conducting Heterostructure Electrolyte of Ba0.5Sr0.5Co0.1Fe0.7Zr0.1Y0.1O3-δ and Ca0.04Ce0.80Sm0.16O2-δ in a High-Performance Low-Temperature Solid Oxide Fuel Cell

Sajid Rauf, Bin Zhu, M. A.K. Yousaf Shah, Zuhra Tayyab, Sanam Attique, Nasir Ali, Naveed Mushtaq, Baoyuan Wang, Changping Yang, Muhammad Imran Asghar, Peter D. Lund

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)

Abstract

Dual-ion electrolytes with oxygen ion and proton-conducting properties are among the innovative solid oxide electrolytes, which exhibit a low Ohmic resistance at temperatures below 550 °C. BaCo0.4Fe0.4Zr0.1Y0.1O3-δ with a perovskite-phase cathode has demonstrated efficient triple-charge conduction (H+/O2-/e-) in a high-performance low-temperature solid oxide fuel cell (LT-SOFC). Here, we designed another type of triple-charge conducting perovskite oxide based on Ba0.5Sr0.5Co0.1Fe0.7Zr0.1Y0.1O3-δ (BSCFZY), which formed a heterostructure with ionic conductor Ca0.04Ce0.80Sm0.16O2-δ (SCDC), showing both a high ionic conductivity of 0.22 S cm-1 and an excellent power output of 900 mW cm-2 in a hybrid-ion LT-SOFC. In addition to demonstrating that a heterostructure BSCFZY-SCDC can be a good functional electrolyte, the existence of hybrid H+/O2- conducting species in BSCFZY-SCDC was confirmed. The heterointerface formation between BSCFZY and SCDC can be explained by energy band alignment, which was verified through UV-vis spectroscopy and UV photoelectron spectroscopy (UPS). The interface may help in providing a pathway to enhance the ionic conductivities and to avoid short-circuiting. Various characterization techniques are used to probe the electrochemical and physical properties of the material containing dual-ion characteristics. The results indicate that the triple-charge conducting electrolyte is a potential candidate to further reduce the operating temperature of SOFC while simultaneously maintaining high performance.

Original languageEnglish
Pages (from-to)35071-35080
Number of pages10
JournalACS applied materials & interfaces
Volume12
Issue number31
DOIs
Publication statusPublished - 5 Aug 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Ba0.5Sr0.5Co0.1Fe0.7Zr0.1Y0.1O3−δ (BSCFZY) perovskite
  • band alignment
  • dual-ion conductivity
  • Schottky junction
  • semiconductor−ion heterostructure
  • triple-charge conduction

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