https://hdl.handle.net/10259/3843 2026-04-18T13:58:49Z https://hdl.handle.net/10259/9276 Silver hexacyanoferrate (II) nanocrystals as a new material to improve Raman scattering enhancement during silver surface oxidation Hernández Muñoz, Sheila; Cheuquepan Valenzuela, William; Pérez Estébanez, Martín; Heras Vidaurre, Aránzazu; Colina Santamaría, Álvaro Raman spectroscopy is a powerful analysis technique that shows its full potential when a high amplification of the Raman signal is achieved. In this sense, Surface-Enhanced Raman scattering (SERS) has been the most widely used phenomenon for analysis. SERS provides the amplification of the Raman intensity due to the interaction of molecules with a plasmonic nanostructured surface. The enhancement of the Raman signal can be also obtained during the electrochemical oxidation of a metal electrode; this phenomenon was denoted as Electrochemical-Surface Oxidation Enhanced Raman Scattering (EC-SOERS) and yields a good Raman signal enhancement with high reproducibility. Until now, only chloride and bromide have been employed in EC-SOERS, using a silver electrode to generate silver chloride and silver bromide nanocrystals. In this work, a new EC-SOERS substrate based on the electrogeneration of silver hexacyanoferrate (II) nanocrystals is presented which provides a very sensitive Raman response. The electrogeneration of this new material can be easily followed using spectroelectrochemistry since the characteristic Raman bands of the nanocrystals lie outside of the fingerprint region used for the analysis where the detection of most of the target molecules is performed. Indigo Carmine has been selected as target molecule, obtaining a very good response at nanomolar level under Raman resonance and non-resonance conditions. 2023-10-10T00:00:00Z https://hdl.handle.net/10259/7581 Electrodeposition of Molybdenum Disulfide (MoS2) Nanoparticles on Monocrystalline Silicon Vizza, Martina; Giurlani, Walter; Cerri, Lorenzo; Calisi, Nicola; Alessio Leonardi, Antonio; Lo Faro, María Josè; Irrera, Alessia; Berretti, Enrico; Perales Rondon, Juan Víctor; Colina Santamaría, Álvaro; Bujedo Saiz, Elena; Innocenti, Massimo Molybdenum disulfide (MoS2 ) has attracted great attention for its unique chemical and physical properties. The applications of this transition metal dichalcogenide (TMDC) range from supercapacitors to dye-sensitized solar cells, Li-ion batteries and catalysis. This work opens new routes toward the use of electrodeposition as an easy, scalable and cost-effective technique to perform the coupling of Si with molybdenum disulfide. MoS2 deposits were obtained on n-Si (100) electrodes by electrochemical deposition protocols working at room temperature and pressure, as opposed to the traditional vacuum-based techniques. The samples were characterized by X-ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM) and Rutherford Back Scattering (RBS). 2022-08-01T00:00:00Z https://hdl.handle.net/10259/7480 Multiamperometric-SERS detection of melamine on gold screen-printed electrodes Hernández Muñoz, Sheila; García, Lydia; Pérez Estébanez, Martín; Cheuquepan Valenzuela, William; Heras Vidaurre, Aránzazu; Colina Santamaría, Álvaro A new, simple and fast protocol to generate gold-based SERS substrates is presented in this work. Melamine is a compound widely used in the industry that can be toxic for humans if consumed even in low concentrations. EC-SERS is an excellent alternative to classical methods to detect and quantify this compound because Raman spectroscopy provides a fingerprint of the molecules, providing very good sensitivity. In this work, timeresolved Raman spectroelectrochemistry is employed to generate a SERS substrate and to detect melamine, all in a single experiment. The dynamic character of this technique provides valuable information about the interaction of the molecule with the generated substrate. An optimization of the spectroelectrochemical method based on a multi-pulse amperometric detection has been performed. The new protocol presented in this work shows significant figures of merit in a very short experiment time, just 25 s. 2022-08-01T00:00:00Z https://hdl.handle.net/10259/7479 Regenerative electrochemical ion pumping cell based on semi-solid electrodes for sustainable Li recovery Perez Antolin, Daniel; Irastorza, Cristina; González, Sara; Moreno, Rebeca; García-Quismondo, Enrique; Palma, Jesús; Lado, Julio J.; Ventosa Arbaizar, Edgar Demand of lithium is expected to increase drastically in coming years driven by the market penetration of electric vehicles powered by Li-ion batteries, which will require faster and more efficient Li extraction technologies than conventional ones (evaporation in brines). The Electrochemical Ion Pumping Cell (EIPC) technology based on the use of Faradaic materials is one of the most promising approaches. However, its relatively short lifespan prevents its commercial deployment. Herein, a new EIPC concept based on the use of semi-solid electrodes is proposed for the first time, which takes advantage of the rheological characteristics of semi-solid electrodes that enable simple and cheap regeneration of the Regenerative Electrochemical Ion Pumping Cell (REIPC) systems after reaching its end-of-life. A proof-of-concept for REIPC is accomplished by simple replacement of the semi-solid electrode demonstrating a remarkable electrochemical performance (e.g. 99.87%cycle− 1 , 99.98%h− 1 , 3–4 mAh cm− 2 ) along with a competitive ion separation (e.g. 16.2 mgLi⋅gNiHCF− 1 , 4 gLi m− 2 and 15.6 Wh⋅mol− 1 ). The use of semisolid electrode offers other unique features such as a significant cost reduction of 95% for every regeneration regarding conventional EIPC, proving that REIPC concept successfully addresses the issues associated to the sustainability and recyclability of the conventional EIPC's for lithium capturing. 2022-07-01T00:00:00Z