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Protonic ceramic fuel cells with added Zn to Y-doped barium cerate-zirconate perovskite electrolyte material show improved mechanical strength, durability, and performance.

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Abstract

Abstract Protonic ceramic fuel cells (PCFCs) have become the most efficient, clean and cost-effective electrochemical energy conversion devices in recent years. While significant progress has been made in developing proton conducting electrolyte materials, mechanical strength and durability still need to be improved for efficient applications. We report that adding 5 mol% Zn to the Y-doped barium cerate-zirconate perovskite electrolyte material can significantly improve the sintering properties, mechanical strength, durability and performance. Using same proton conducting material in anodes, electrolytes and cathodes to make a strong structural backbone shows clear advantages in mechanical strength over other arrangements with different materials. Rietveld analysis of the X-ray and neutron diffraction data of BaCe 0.7 Zr 0.1 Y 0.15 Zn 0.05 O 3-δ (BCZYZn05) revealed a pure orthorhombic structure belonging to the Pbnm space group. Structural and electrochemical analyses indicate highly dense and high proton conductivity at intermediate temperature (400-700 °C). The anode-supported single cell, NiO-BCZYZn05 | BCZYZn05 | BSCF-BCZYZn05, demonstrates a peak power density of 872 mW cm -2 at 700 °C which is one of the highest power density in an all-protonic solid oxide fuel cell. This observation represents an important step towards commercially viable SOFC technology.

Key findings

  • Adding 5 mol% Zn to the Y-doped barium cerate-zirconate perovskite electrolyte material improves sintering properties and mechanical strength.
  • Using the same proton conducting material in anodes, electrolytes, and cathodes improves mechanical strength compared to other arrangements.
  • Rietveld analysis reveals a pure orthorhombic structure belonging to the Pbnm space group in the BCZYZn05 material.

Keywords

ElectrolyteCeramicPower densityConductivityPerovskite (structure)Rietveld refinement

Identifiers

DOI
10.21203/rs.3.rs-601475/v1
Journal
Research Square
Year
2021