Constructing an active and stable oxygen electrode surface for reversible protonic ceramic electrochemical cells
Pei, Kai (South China University of Technology)
Luo, Shunrui (Institut Català de Nanociència i Nanotecnologia)
He, Fan (South China University of Technology)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Xu, Yangseng (South China University of Technology)
Zhu, Feng (South China University of Technology)
Wang, Yakun (South China University of Technology)
Chen, Yu (South China University of Technology)

Data:	2023
Resum:	The reversible protonic ceramic electrochemical cells (R-PCECs) can efficiently and cost-effectively store and convert energy at low-intermediate temperatures (400-700 C). Their widespread commercialization is mainly limited by the challenges of oxygen electrodes due to the slow oxygen reaction kinetics and poor durability. In this study, we first enhance the reaction activity and surface stability of a double-perovskite PrBaCoO (PBC) oxygen electrode by employing a fluorite-based PrCeO (PCO) catalyst coating. The PCO-coated PBC (PCO-PBC) oxygen electrode shows a much-reduced area-specific resistance of 0. 096 Ωcm and good performance on a fuel-electrode supported single cell at 650 C, displaying a typical peak power density of 1. 21 Wcm (in fuel cell mode) and a typical current density of 2. 69 Acm at 1. 3 V (in electrolysis mode) with reasonable faradaic efficiencies and durability. PCO coating has significantly improved the surface exchange process, facilitated ion diffusion, and suppressed the Ba-segregation of PBC, as confirmed by the analyses of electrochemical performance and TEM.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00457 Agencia Estatal de Investigación PID2020-116093RB-C43 Agencia Estatal de Investigación CEX2021-001214-S
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Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Publicat a:	Applied catalysis. B, Environmental, Vol. 330 (August 2023) , art. 122601, ISSN 0926-3373

DOI: 10.1016/j.apcatb.2023.122601

Preprint 32 p, 3.1 MB

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