DSpace Collection:http://hdl.handle.net/10261/12422024-03-28T08:02:26Z2024-03-28T08:02:26ZCement-Based Radiative Coolers for Photovoltaics: Towards a Practical DesignCagnoni, MatteoTesta, PietroDolado, Jorge S.Cappelluti, FedericaMIRACLE Project ID: 964450http://hdl.handle.net/10261/3483322024-02-27T02:15:17Z2024-02-26T11:35:13ZTítulo: Cement-Based Radiative Coolers for Photovoltaics: Towards a Practical Design
Autor: Cagnoni, Matteo; Testa, Pietro; Dolado, Jorge S.; Cappelluti, Federica; MIRACLE Project ID: 964450
Resumen: In 2014, the experimental realization of radiative coolers capable of reaching sub-ambient temperatures
under direct sunlight has opened up new possibilities for the thermal management of solar cells. Radiative
coolers eject excess heat by emitting thermal radiation within the so-called atmosphere transparency
window. The completely passive nature of this process and its reliance on material properties only, make
radiative coolers extremely attractive in terms of energy efficiency. Integrated with a photovoltaic cell, the
radiative cooler can reduce the cell operating temperature, leading to high efficiency and lifetime gains.
Yet, most radiative coolers in the literature are metamaterials with scarce elements or complex fabrications
processes, or organic materials with potential UV instability, with questionable economic viability or
reliability. To address this problem, we have recently proposed cement-based materials as a low-cost,
scalable and stable solution for photovoltaics cooling, showing that their electromagnetic properties can be
tuned to maximize their thermal emissivity by acting on their microstructure. In particular, using a detailed
balance model, we have demonstrated that their cooling performance could increase the efficiency of silicon
solar cells by up to 9% and extended their lifetime by up to 4 times. In this work, we take a further step
towards the experimental realization of this attractive concept, by investigating possible approaches,
requirements and prospects for the practical design of photovoltaic systems employing cement-based
radiative coolers.
Descripción: Research conducted in the framework of MIRACLE Project (Photonic Metaconcrete with Infrared RAdiative Cooling capacity for Large Energy savings, GA 964450), coordinated by Dr. Jorge Sánchez Dolado, from Centro de Física de Materiales (CFM).2024-02-26T11:35:13ZSpectroscopic studies of acylium- and thioacylium ionsThorwirth, S.Asvany, O.Salomon, T.Bast, M.Schmid, P. C.Savić, I.Harding, M. E.Doménech Martínez, José LuisSchlemmer, S.http://hdl.handle.net/10261/3097762023-07-20T11:46:41Z2023-05-26T11:02:02ZTítulo: Spectroscopic studies of acylium- and thioacylium ions
Autor: Thorwirth, S.; Asvany, O.; Salomon, T.; Bast, M.; Schmid, P. C.; Savić, I.; Harding, M. E.; Doménech Martínez, José Luis; Schlemmer, S.
Resumen: Acylium ions, R-C ≡ O +, play a vital role as reaction intermediates in preparatory organic synthesis and, along with their sulfur analogs, R-C ≡ S +, have also been invoked in astrochemical reaction networks to account for the production of (carbon-rich) chain molecules. While in the past some knowledge about the occurence and also kinetics of acylium-/thioacylium ions has been derived through mass spectrometry, comparatively little is known from spectroscopic study going beyond the simplest members of each family, HCO + and HCS + . Here, recent theoretical and spectroscopic studies in the Cologne laboratories are presented.
Descripción: Proceedings of the 7th Chile-Cologne-Bonn Symposium, held 26-30 September, 2022 in Puerto-Varas, Chile.2023-05-26T11:02:02Z