1. Spectroscopic insights into the electrochemical mechanism of rechargeable calcium/sulfur batteriesAntonio Scafuri, Romain Berthelot, Klemen Pirnat, Alen Vižintin, Jan Bitenc, Giuliana Aquilanti, Dominique Foix, Rémi Dedryvère, Iztok Arčon, Robert Dominko, Lorenzo Stievano, 13, original scientific article Abstract: Calcium batteries represent a promising alternative to lithium metal systems. The combination of the low redox potential and low cost and the energy-dense calcium anode (2073 mAh/cm3, similar to 2044 mAh/cm3 for Li) with appropriate low-cost cathode materials such as sulfur could produce a game-changing technology in several fields of applications. In this work, we present the reversible activity of a proof-of-concept Ca/S battery at room temperature, characterized by a surprising medium-term cycling stability with low polarization, promoted by the use of a simple positive electrode made of sulfur supported on an activated carbon cloth scaffold, and a state-of-the-art fluorinated alkoxyborate-based electrolyte. Insights into the electrochemical mechanism governing the chemistry of the Ca/S system were obtained for the first time by combining X-ray photoelectron spectroscopy and X-ray absorption spectroscopy. The mechanism implies the formation of different types of soluble polysulfide species during both charge and discharge at room temperature, and the formation of solid CaS at the end of discharge. The reversible electrochemical activity is proven by the reformation of elemental sulfur at the end of the following charge. These promising results open the way to the comprehension of emerging Ca/S systems, which may represent a valid alternative to Mg/S and Li/S batteries. Keywords: Calcium/Sulfur Batteries
EXAFS, XANES Published in RUNG: 17.10.2020; Views: 2822; Downloads: 0 This document has many files! More... |
2. Magnesium Modifies the Structural Features of Enzymatically Mineralized Collagen Gels Affecting the Retraction Capabilities of Human Dermal Fibroblasts Embedded within This 3D SystemFederica Boraldi, Angelica Bartolomeo, Giulia Annovi, Romain Debret, Daniela Quaglino, 2016, original scientific article Keywords: collagen type I, alkaline phosphatase, fibroblast, three dimensional gel, morphology, mineralization Published in RUNG: 23.08.2019; Views: 2921; Downloads: 0 This document has many files! More... |
3. Studies of the microwave emission of extensive air showers with GIGAS and MIDAS at the Pierre Auger ObservatoryRomain Gaïor, Andrej Filipčič, Gašper Kukec Mezek, Ahmed Saleh, Samo Stanič, Marta Trini, Serguei Vorobiov, Lili Yang, Danilo Zavrtanik, Marko Zavrtanik, 2017, published scientific conference contribution Keywords: Pierre Auger Observatory, microwave emission of extensive air showers, GIGAS and MIDAS Published in RUNG: 16.02.2018; Views: 3132; Downloads: 167 Full text (5,97 MB) |
4. Detection of cosmic rays using microwave radiation at the Pierre Auger ObservatoryRomain Gaïor, Andrej Filipčič, Thomas Paul, Samo Stanič, Darko Veberič, Danilo Zavrtanik, Marko Zavrtanik, 2013, published scientific conference contribution Keywords: Observatorij Pierre Auger, kozmični žarki, radijska emisija Published in RUNG: 15.10.2013; Views: 4763; Downloads: 30 Link to full text |