Publication date: 10th April 2024
Reversible protonic ceramic electrochemical cells (R-PCECs) offer a promising avenue for energy conversion and storage at low to intermediate temperatures (400-700°C), facilitating the conversion of water to hydrogen in electrolysis mode and vice versa, generating electricity in fuel cell mode [1-2]. However, challenges such as slow oxygen reduction/evolution reaction (ORR/OER) kinetics at these temperatures, along with undesirable surface segregation and structural deterioration, hinder their development. PrBaCo2O5+δ (PBC) has emerged as a focus for oxygen electrode materials due to its notable catalytic activity and electrical conductivity. Nonetheless, issues like cobalt oxides and barium carbonate segregation at the surface/interface impede oxygen ion and proton diffusion, leading to a swift decline in performance [3]. This presentation outlines our strategies to enhance the surface/interface of PBC using doping, infiltration [3], and chemical etching techniques. Applied with precision, these methods create a surface/interface that is both more active and durable, thus improving oxygen electrode functionality. Employing advanced characterization tools like Transmission Electron Microscopy (TEM) and Electron Energy Loss Spectroscopy (EELS), we have achieved a comprehensive understanding of the microstructural and compositional transformations from the bulk material to the surface/interface, enabling significant advancements in R-PCECs technology.
This study is financially supported by the Natural Science Foundation of Guangdong Province (2021A1515010395), the National Natural Science Foundation of China (22179039 and 22005105), the Fundamental Research Funds for the Central Universities (2022ZYGXZR002), the Pearl River Talent Recruitment Program (2019QN01C693), and the Introduced Innovative R&D Team of Guangdong (2021ZT09L392). K.P. appreciates the support of the China Postdoctoral Science Foundation Project (2020M682700). S.L. appreciates the support of the Science and Technology Innovation Program of Hunan Province (2021RC2007). ICN2 acknowledges funding from Generalitat de Catalunya 2021SGR00457. This study was supported by MCIN with funding from European Union NextGenerationEU (PRTR-C17. I1) and Generalitat de Catalunya. This research is part of the CSIC program for the Spanish Recovery, Transformation, and Resilience Plan funded by the Recovery and Resilience Facility of the European Union, established by the Regulation (EU) 2020/2094. The authors thank the support from the project NANOGEN (PID2020-116093RB-C43), funded by MCIN/ AEI/10.13039/501100011033/ and by “ERDF A way of making Europe”, by the “European Union”. ICN2 is supported by the Severo Ochoa program from Spanish MCIN/AEI (Grant No.: CEX2021-001214-S) and is funded by the CERCA Programme / Generalitat de Catalunya.
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