Exceptionally high performance of protonic ceramic fuel cells with stoichiometric electrolytes

Abstract

Proton conducting electrochemical cells, especially protonic ceramic fuel cells (PCFCs), are expected to be a breakthrough technology in next-generation energy conversion systems, primarily because of their high proton conductivity and low activation energy below 600 °C. However, the low chemical and physical stability of proton conducting oxides during the sintering process has resulted in a substantially lower electrochemical performance than their predictions, limiting their utilization and application. Here, we present the fabrication of a stoichiometric BaZr0.4Ce0.4Y0.1Yb0.1O3−δ (BZCYYb) electrolyte with an average grain size of ∼10 μm by controlling the chemical potential of the A-site cation, Ba, near the BZCYYb electrolyte surface during the sintering process. A stoichiometric BZCYYb-based PCFC in an anode-supported configuration exhibits 1.90 W cm−2 and 1.01 W cm−2 with an extremely low ohmic resistance of 0.060 ohm cm2 at 650 °C and 0.082 ohm cm2 at 550 °C, respectively, surpassing the values of all previously reported PCFCs without complicated engineering in materials and structures of other cell components.

Graphical abstract: Exceptionally high performance of protonic ceramic fuel cells with stoichiometric electrolytes

Supplementary files

Article information

Article type
Paper
Submitted
18 May 2021
Accepted
15 Oct 2021
First published
16 Oct 2021

Energy Environ. Sci., 2021, Advance Article

Exceptionally high performance of protonic ceramic fuel cells with stoichiometric electrolytes

M. Choi, J. Paik, D. Kim, D. Woo, J. Lee, S. J. Kim, J. Lee and W. Lee, Energy Environ. Sci., 2021, Advance Article , DOI: 10.1039/D1EE01497H

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