Publication date: 10th April 2024
Hydrogen energy has attracted great interest as a renewable and sustainable energy source to achieve carbon neutrality in response to environmental pollution issues and climate change caused by the accelerated greenhouse gas emissions following industrialization. Among the several hydrogen energy systems, reversible-solid oxide cells (R-SOCs) have been regarded as promising electrochemical devices due to their excellent conversion efficiency in both power and fuel generating modes. However, the high-operating temperature of 800-1000 oC leads to serious obstacles such as incompatibility between cell components, gas-sealing, and rapid performance degradation from severe thermal stress. Reversible-protonic ceramic cells (R-PCCs) with proton-conducting oxide (PCO) electrolytes are suggested as a solution for lowering the operating temperature (400-600 oC), as proton transport requires significantly less activation energy (0.4-0.6 eV) than that of oxygen ions. Meanwhile, the electrochemical performances of R-PCCs have currently lagged behind predictions based on their high ionic conductivity due to the sluggish electrocatalytic activities of the air electrode. Thus, further development of highly efficient air electrodes for the fast oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) imperatively remains. Herein, we report a novel air electrode material, Ni-doped layered perovskite PrBa0.5Sr0.5Co2-xNixO5+d (PBSCN, x=0, 0.1, and 0.2), for R-PCCs. With increasing Ni content, the lower oxidation states of Ni and Co were significantly improved the quantitative oxygen vacancy concentration and proton concentration. The PBSCN20 air electrode exhibited outstanding electrochemical performances, exceeding a peak power density of 0.64 W cm-2 in fuel cell mode and a current density of 0.41 A cm-2 in electrolysis mode at 1.3 V and 500 oC. Furthermore, a long-term stability demonstrated excellent durability without obvious performance degradation for 700 h under fuel cell mode, electrolysis mode, and reversible operation mode.
This research was supported by National Research Foundation of Korea (NRF) (NRF- 2021M3I3A1084292).
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
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.