Publication date: 17th July 2025
The exsolution of transition-metal nanoparticles from non-stoichiometric perovskites presents a powerful strategy for creating high-activity, regenerable fuel cell electrodes. This presentation highlights two recent advances that exploit this approach across distinct electrochemical systems.
First, we examine the A-site-deficient perovskite La0.4Sr0.4Sc0.9Ni0.1O3−δ. Guided by thermodynamic assessment and density functional theory (DFT), this material was designed for the favorable segregation of nickel. Upon hydrogen reduction, it yields uniformly distributed Ni nanoparticles that lower the area-specific resistance to an exceptional 0.055 Ω cm² at 800 °C in humid H2, validating models of heterogeneous nucleation and growth.
Second, the mixed-conducting perovskite BaCo0.4Fe0.4Zr0.1Y0.1O3−δ is presented as a bifunctional electrode for a symmetric protonic ceramic fuel cell. DFT reveals that its performance is driven by the reversible exsolution and dissolution of Co-Fe nanoparticles, a process governed by defect chemistry and orbital interactions. The resulting self-recovering electrodes deliver a peak power density of approximately 350 mW cm⁻² with H2 and demonstrate remarkable fuel flexibility and extended lifetime with methanol or methane.
By synthesizing mechanistic insights from these complementary systems, this talk establishes clear design principles for engineering advanced electrodes. We outline how tailoring cation chemistry, vacancy concentration, and redox protocols can precisely control nanoparticle nucleation, size, and regenerability, charting a strategic path toward efficient, durable, and commercially viable fuel cells.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.