Direct methane protonic ceramic fuel cells with self-assembled Ni-Rh bimetallic catalyst

Kyungpyo Hong, Mingi Choi, Yonggyun Bae, Jihong Min, Jaeyeob Lee, Donguk Kim, Sehee Bang, Han-Koo Lee, Wonyoung Lee () and Jongsup Hong ()
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Kyungpyo Hong: Yonsei University
Mingi Choi: Seoul National University of Science & Technology
Yonggyun Bae: Yonsei University
Jihong Min: Yonsei University
Jaeyeob Lee: Sungkyunkwan University (SKKU)
Donguk Kim: Sungkyunkwan University (SKKU)
Sehee Bang: Sungkyunkwan University (SKKU)
Han-Koo Lee: Pohang University of Science and Technology (POSTECH)
Wonyoung Lee: Sungkyunkwan University (SKKU)
Jongsup Hong: Yonsei University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Direct methane protonic ceramic fuel cells are promising electrochemical devices that address the technical and economic challenges of conventional ceramic fuel cells. However, Ni, a catalyst of protonic ceramic fuel cells exhibits sluggish reaction kinetics for CH4 conversion and a low tolerance against carbon-coking, limiting its wider applications. Herein, we introduce a self-assembled Ni-Rh bimetallic catalyst that exhibits a significantly high CH4 conversion and carbon-coking tolerance. It enables direct methane protonic ceramic fuel cells to operate with a high maximum power density of ~0.50 W·cm−2 at 500 °C, surpassing all other previously reported values from direct methane protonic ceramic fuel cells and even solid oxide fuel cells. Moreover, it allows stable operation with a degradation rate of 0.02%·h−1 at 500 °C over 500 h, which is ~20-fold lower than that of conventional protonic ceramic fuel cells (0.4%·h−1). High-resolution in-situ surface characterization techniques reveal that high-water interaction on the Ni-Rh surface facilitates the carbon cleaning process, enabling sustainable long-term operation.

Date: 2023
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DOI: 10.1038/s41467-023-43388-8

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