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Research at St Andrews

Improved mechanical strength, proton conductivity and power density in an ‘all-protonic’ ceramic fuel cell at intermediate temperature

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Author(s)

Abul K. Azad, Abdalla M. Abdalla, Ahmed Afif, Atia Azad, Shammya Afroze, Azam Che Idris, Jun-Young Park, Mohammad Saqib, Nikdalila Radenahmad, Shahzad Hossain, Iftakhar Bin Elius, Md. Al-Mamun, Juliana Zaini, Amer Al-Hinai, Md. Sumon Reza, John T. S. Irvine

School/Research organisations

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 BaCe0.7Zr0.1Y0.15Zn0.05O3−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.
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Details

Original languageEnglish
Article number19382
Number of pages10
JournalScientific Reports
Volume11
DOIs
Publication statusPublished - 29 Sep 2021

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