Browsing by Author "55cf9d82-4f78-4fa4-b8f6-3e87c074245b"
Now showing items 21-40 of 83
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Electrochemical valorization of HMF using Ni/Graphite electrodes
Carvajal, David; Arcas, Ramón; Gouda, Laxman; Fabregat-Santiago, Francisco; Mas, Elena Elsevier (2024-01)The electrooxidation of 5-hydroxymethylfurfural (HMF) into 2,5- furandicarboxilic acid (FDCA) has been successfully accomplished using cost-effective NiO–OH electrodes, prepared through Ni electrodeposition on pencil ... -
Electron injection and scaffold effects in perovskite solar cells
Anaya, Miguel; Zhang, Wei; Clasen Hames, Bruno; Li, Yuelong; Fabregat-Santiago, Francisco; Calvo, Mauricio E.; Snaith, Henry J.; Míguez, Hernán; Mora-Sero, Ivan Royal Society of Chemistry (2016-12)In spite of the impressive efficiencies reported for perovskite solar cells (PSCs), key aspects of their working principles, such as electron injection at the contacts or the suitability of the utilization of a specific ... -
Electron Lifetime in Dye-Sensitized Solar Cells: Theory and Interpretation of Measurements
Bisquert, Juan; Fabregat-Santiago, Francisco; Mora-Sero, Ivan; Garcia-Belmonte, Germà; Gimenez, Sixto American Chemical Society (2009)The electron lifetime τn in dye-sensitized solar cells (DSC) is a central quantity to determine the recombination dynamics in the solar cell. It can be measured by several methods: impedance spectroscopy, IMVS, stepped ... -
Electron Transport and Recombination in Solid-State Dye Solar Cell with Spiro-OMeTAD as Hole Conductor
Fabregat-Santiago, Francisco; Bisquert, Juan; Cevey, Le; Chen, Peter; Wang, Mingkui; Zakeeruddin, Shaik Mohammed; Grätzel, Michael American Chemical Society (2009)We show that electron transport mechanisms in TiO2 solid-state dye-sensitized solar cells (SDSCs) with spiro-OMeTAD as hole conductor are similar to those of high-performance DSCs with liquid electrolytes and ionic liquids. ... -
Electron Transport in Dye-Sensitized Solar Cells Based on ZnO Nanotubes: Evidence for Highly Efficient Charge Collection and Exceptionally Rapid Dynamics
Martinson, Alex B. F.; Góes, Márcio Sousa; Fabregat-Santiago, Francisco; Bisquert, Juan; Pellin, Michael J.; Hupp, Joseph T. American Chemical Society (2009)Dye-sensitized solar cells based on ordered arrays of polycrystalline ZnO nanotubes, 64 μm in length, are shown to exhibit efficient electron collection over the entire photoanode array length. Electrochemical impedance ... -
Electron trapping induced electrostatic adsorption of cations: a general factor leading to photoactivity decay of nanostructured TiO2
He, Tao; libo, wang; Fabregat-Santiago, Francisco; Liu, Guoqun; Li, Ying; Wang, Chong; Guan, Rengui Royal Society of Chemistry (2017-02)In this work, a mechanism of electron trapping induced electrostatic adsorption of electrolyte cations (ETIEA) is proposed to explain the general photoactivity decay of nanostructured TiO2 electrodes, usually occurring ... -
Electron-Transfer Kinetics through Interfaces between Electron-Transport and Ion-Transport Layers in Solid-State Dye-Sensitized Solar Cells Utilizing Solid Polymer Electrolyte
Cho, Woohyung; Lim, Jongchul; Kim, Tea-Yon; Kim, Young Rae; Song, Donghoon; Park, Taiho; Fabregat-Santiago, Francisco; Bisquert, Juan; Kang, Yong Soo American Chemical Society (2016)The origin of the differences between the performance parameters found for dye-sensitized solar cells (DSCs) using liquid and poly(ethylene oxide)-based solid polymer electrolytes has been investigated. Limitations associated ... -
Elucidating Capacitance and Resistance Terms in Confined Electroactive Molecular Layers
Bueno, Paulo R.; Fabregat-Santiago, Francisco; Davis, Jason J. American Chemical Society (2013)Electrochemical analyses on confined electroactive molecular layers, herein exemplified with electroactive self-assembled monolayers, sample current contributions that are significantly influenced by additional nonfaradaic ... -
Enhanced Carrier Transport Distance in Colloidal PbS Quantum-Dot-Based Solar Cells Using ZnO Nanowires
Wang, Haibin; González Pedro, Victoria; Kubo, Takaya; Fabregat-Santiago, Francisco; Bisquert, Juan; Sanehira, Yoshitaka American Chemical Society (2015-11)Nanostructured solar cells are a promising area of research for the production of low cost devices that may eventually be capable of complementing or even replacing present technologies in the field of solar power ... -
Enhanced diffusion through porous nanoparticle optical multilayers
López López, Carmen; Colodrero, Silvia; Raga, Sonia R.; Lindström, Henrik; Fabregat-Santiago, Francisco; Bisquert, Juan; Míguez, Hernán Royal Society of Chemistry (2012)Herein we demonstrate improved mass transport through nano- particle one-dimensional photonic crystals of enhanced porosity. Analysis is made by impedance spectroscopy using iodine and ionic liquid based electrolytes and ... -
Enhanced electrochemical hydrogen peroxide productionfrom surface state modified mesoporous tin oxide catalysts
BinSaeedan, Norah M.; Arunachalam, Prabhakarn; Al-Mayouf, Abdullah; Naji Shaddad, Maged; Amer, Mabrook S.; Beagan, Abeer; Fabregat-Santiago, Francisco; Bisquert, Juan Wiley (2022-05-15)Electrochemical hydrogen peroxide (H2O2) production via the two-electronoxygen reduction reaction (ORR) has received much consideration as a substi-tute to the well-known industrial anthraquinone method. The present ... -
Experimental Characterization and Statistical Analysis of Water-Based Gold Nanofluids for Solar Applications: Optical Properties and Photothermal Conversion Efficiency
Burgos Rodríguez, Jorge; Mondragon, Rosa; Elçioğlu, Elif Begüm; Fabregat-Santiago, Francisco; Hernandez, Leonor Wiley (2022-03-26)Optimizing optical and photothermal properties of the solar nanofluids (NFs) to be used in direct absorption solar collectors is a key issue to maximize efficiencies in these collector types. This work both experimentally ... -
Experimental Data in "New Views on Carrier Diffusion and Recombination by Combining Small Perturbation Techniques: Application to BiVO4 Photoelectrodes"
Alvarez, Agustin; García-Tecedor, Miguel; Montañés, Laura; Mas, Elena; Gimenez, Sixto; Fabregat-Santiago, Francisco (2022) -
From Flat to Nanostructured Photovoltaics: Balance between Thickness of the Absorber and Charge Screening in Sensitized Solar Cells
Fabregat-Santiago, Francisco; Bisquert, Juan; Mora-Sero, Ivan; Boix, Pablo P; Yong, Hui Lee; Sang, Hyuk Im; Sang, Il Seok American Chemical Society (2012-01)Nanoporous metal oxide electrodes provide a high internal area for dye anchoring in dye-sensitized solar cells, but the thickness required to extinguish the solar photons also enhances recombination at the TiO2/electrolyte ... -
General Working Principles of CH3NH3PbX3 Perovskite Solar Cells
González Pedro, Victoria; Juarez-Perez, Emilio J.; Arsyad, Waode Sukmawati; Barea, Eva M; Fabregat-Santiago, Francisco; Mora-Sero, Ivan; Bisquert, Juan American Chemical Society (2014)Organometal halide perovskite-based solar cells have recently realized large conversion efficiency over 15% showing great promise for a new large scale cost-competitive photovoltaic technology. Using impedance spectroscopy ... -
Harnessing infrared photons for photoelectrochemical hydrogen generation. A PbS quantum dot based "quasi-artificial leaf"
Trevisan, Roberto; Rodenas, Pau; González Pedro, Victoria; Sima, Cornelia; S. Sánchez, Rafael; Barea, Eva M; Mora-Sero, Ivan; Fabregat-Santiago, Francisco; Gimenez, Sixto American Chemical Society (2013)Hydrogen generation by using quantum dot (QD) based heterostructures has emerged as a promising strategy to develop artificial photosynthesis devices. In the present study, we sensitize mesoporous TiO2 electrodes with ... -
High carrier density and capacitance in TiO2 Nanotube arrays induced by electrochemical doping
Fabregat-Santiago, Francisco; Barea, Eva M; Bisquert, Juan; Mor, Gopal K.; Shankar, Karthik; Grimes, Craig A. American Chemical Society (2008)The paper describes the electronic charging and conducting properties of vertically oriented TiO2 nanotube arrays formed by anodization of Ti foil samples. The resulting films, composed of vertically oriented nanotubes ... -
Hole conductivity and acceptor density of p-type CuGaO2 nanoparticles determined by impedance spectroscopy: The effect of Mg doping
Herraiz Cardona, Isaac; Fabregat-Santiago, Francisco; Renaud, Adèle; Julian-Lopez, Beatriz; Odobel, Fabrice; Carioc, Laurent; Jobic, Stéphane; Gimenez, Sixto Elsevier (2013)Delafossite materials like CuGaO2 have appeared as promising p-type semiconductor materials for their exploitation in tandem dye sensitized solar cells and water splitting photoelectrochemical cells. However, the intrinsic ... -
Hydrazine sensors development based on a glassy carbon electrode modified with a nanostructured TiO2 films by electrochemical approach
Rahman, Mohammed M.; Alfonso, Valero G.; Fabregat-Santiago, Francisco; Bisquert, Juan; Asiri, Abdullah M.; Alshehri, Abdelmohsen A.; Albar, Hassan A. Springer Verlag (2017)The authors describe a selective hydrazine sensor that is based on the use of a film of TiO2 nanoparticles faceted predominantly at the 101 and 001 sides. The hydrazine (Hyd) sensor was fabricated by depositing the ... -
Impedance spectroscopic analysis of high-performance dye sensitized solar cells based on nano-clay electrolytes
González Pedro, Victoria; Sakurai, Hideki; Tomita, Mitsuru; Ito, Bruno Ieri; Fabregat-Santiago, Francisco; Uchida, Satoshi; Segawa, Hiroshi Elsevier (2016)In this work we present quasi-solid state dye-sensitized solar cells obtained employing artificial hydrotalcite nano-clay as electrolyte additive, with a greatly improved photo-energy conversion efficiency of up to 10.9% ...