Collaborated with Prof. Pei Dong and her student, Boshen Xu, from George Mason University, we recently have one review paper titled with “Surface Reconstruction of Versatile Perovskites via In Situ Nanoparticle Engineering for Solid Oxide Cells” to be published by Chem Catalysis.
Dr. Jiufeng Ruan, our postdoc researcher, is the equal first author together with Boshen.
This review discusses the atomic-scale surface reconstruction of perovskite oxides via in situ exsolution. It emphasizes the fundamental mechanisms, strategies for precise process control, and the recent progresses of advanced techniques for in situ explorative characterizations. These insights provide guidance for designing durable and efficient perovskite catalysts in solid oxide cells.
Congratulations, everyone! The paper link will be provided soon.
Hybridizing Electrode Interface Structures in Protonic Ceramic Cells for Durable, Reversible Hydrogen and Power Generation
Protonic ceramic electrochemical cells (PCECs) represent a transformative sustainable technology for hydrogen production and power generation, offering an efficient means of energy cycling between electrical and chemical forms. Operating at intermediate temperatures, PCECs utilize proton-conducting ceramic electrolytes, achieving high efficiency, reduced material degradation, and seamless integration with renewable energy systems. These advantages position PCECs as a key component of future sustainable energy solutions. However, a significant challenge remains at the oxygen electrode, where sluggish reaction kinetics and limited active sites hinder overall performance. To address these limitations, we present a hybrid oxygen electrode featuring a PrNi0.7Co0.3O3–δ (PNC) backbone infused with oxygen vacancy-rich praseodymium oxide (PrOx) nanoparticles. This design leverages the interplay between surface and bulk properties to enhance oxygen adsorption, diffusion, and catalytic kinetics. The PrOx nanoparticles introduce abundant oxygen vacancies and modulate the d-band center for optimal adsorption energy, while the PNC backbone provides robust proton conduction and stabilizes reaction intermediates. Electrochemical full cells incorporating this hybrid electrode demonstrate a peak power density of 1.56 W cm-2 at 600°C in fuel cell mode and a current density of 2.25 A cm-2 at 1.30 V in electrolysis mode. Faradaic and energy efficiencies reach 96.8% and 89.9%, respectively, with exceptional thermal cycling stability and reduced polarization resistance (0.079 Ω cm2). By integrating oxygen vacancy engineering with proton-conducting frameworks, this study highlights a scalable approach to overcoming fundamental limitations in PCEC design. The results underscore the potential of advanced electrode architectures to significantly enhance the efficiency, durability, and applicability of PCECs in renewable energy systems.
