Listar Departament: Física por autoría "f91ca8b7-2f59-4583-a516-f4d4186c64ca"

Mostrando ítems 21-40 de 45

    • closedAccess   Modeling and characterization of extremely thin absorber (eta) solar cells based on ZnO nanowires 

      Mora-Sero, Ivan; Gimenez, Sixto; Fabregat-Santiago, Francisco; Azaceta, Eneko; Tena-Zaera, Ramón; Bisquert, Juan RSC Publishing (2011-03-15)
      Extremely thin absorber (eta)-solar cells based on ZnO nanowires sensitized with a thin layer of CdSe have been prepared, using CuSCN as hole transporting material. Samples with significantly different photovoltaic performance ...

    • openAccess   Modulating the interaction between gold and TiO2 nanowires for enhanced solar driven photoelectrocatalytic hydrogen generation 

      Sudhagar, P.; Song, Taeseup; Devadoss, Anitha; Lee, Jung Woo; Haro, Marta; Terashima, Chiaki; Lysak, Volodymyr V.; Bisquert, Juan; Fujishima, Akira; Gimenez, Sixto; Paik, Ungyu Royal Society of Chemistry (2015)
      The interaction strength of Au nanoparticles with pristine and nitrogen doped TiO2 nanowire surfaces was analysed using density functional theory and their significance in enhancing the solar driven photoelectrocatalyti ...

    • openAccess   Near-complete suppression of surface losses and total internal quantum efficiency in BiVO4 photoanodes 

      Trzesniewski, Bartek J.; Digdaya, Ibadillah; Nagaki, Tetsuro; Ravishankar, Sandheep; Herraiz Cardona, Isaac; Vermaas, David; Longo, Alessandro; Gimenez, Sixto; Smith, Wilson A. Royal Society of Chemistry (2017-05-26)
      Bismuth vanadate (BiVO4) is one of the most efficient light absorbing metal oxides for solar water splitting. BiVO4 photoanodes immersed in an electrolyte in an open circuit configuration and exposed to simulated solar ...

    • openAccess   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 Wiley (2022)
      Impedance spectroscopy (IS), intensity-modulated photocurrent spectroscopy (IMPS), and intensity-modulated photovoltage spectroscopy (IMVS) are well-established powerful modulated techniques to characterize optoelectronic ...

    • openAccess   Organic photoelectrochemical cells with quantitative photocarrier conversion 

      Guerrero, Antonio; Haro, Marta; Bellani, Sebastiano; Antognazza, Maria Rosa; Meda, Laura; Gimenez, Sixto; Bisquert, Juan Royal Society of Chemistry (2014)
      Efficient solar-to-fuel conversion could be a cost-effective way to power the planet using sunlight. Herein, we demonstrate that Organic Photoelectrochemical Cells (OPECs) constitute a versatile platform for the efficient ...

    • closedAccess   Panchromatic sensitized solar cells based on metal sulfide quantum dots grown directly on nanostructured TiO2 electrodes 

      Mora-Sero, Ivan; Gimenez, Sixto; Braga, Antonio; Concina, Isabella; Vomiero, Alberto American Chemical Society (2011-02)
      The use of narrow band gap semiconductors such as PbS may expand the light absorption range to the near-infrared region in quantum-dot-sensitized solar cells (QDSCs), increasing the generated photocurrent. However, the ...

    • closedAccess   Panchromatic Solar-to-H2 Conversion by a Hybrid Quantum Dots-Dye Dual Absorber Tandem Device 

      González Pedro, Victoria; Zarazúa, Isaac; Barea, Eva M; Fabregat-Santiago, Francisco; Rosa, Elder de la; Mora-Sero, Ivan; Gimenez, Sixto American Chemical Society (2014-01)
      Solution-processed mesoscopic oxide semiconductor-based materials offer potentially low-cost and high stability alternative for next generation of water to hydrogen conversion photoelectrochemical cells (PEC). In the present ...

    • closedAccess   Photoanodes Based on Nanostructured WO3 for Water Splitting 

      Tacca, Alessandra; Meda, Laura; Marra, Gianluigi; Savoini, Alberto; Caramori, Stefano; Cristino, Vito; Bignozzi, Carlo Alberto; González Pedro, Victoria; Pérez Boix, Pablo; Gimenez, Sixto; Bisquert, Juan Wiley (2012-08)
      Anodically grown WO3 photoelectrodes prepared in an N-methylformamide (NMF) electrolyte have been investigated with the aim of exploring the effects induced by anodization time and water concentration in the electrochemical ...

    • openAccess   Photoelectrochemical and Impedance Spectroscopic Investigation of Water Oxidation with “Co–Pi”-Coated Hematite Electrodes 

      Klahr, Benjamin; Gimenez, Sixto; Fabregat-Santiago, Francisco; Bisquert, Juan; Hamann, Thomas American Chemical Society (2012)
      Uniform thin films of hematite (α-Fe2O3) deposited by atomic layer deposition (ALD) coated with varying amounts of the cobalt phosphate catalyst, “Co–Pi,” were investigated with steady-state and transient photoelectrochemical ...

    • closedAccess   Photoelectrochemical water splitting with dual-photoelectrode tandem and parallel configurations: Enhancing light harvesting and carrier collection efficiencies 

      Keshavarzi, Reza; Mousavian, Mahlasadat; Omrani, MirKazem; Mirkhani, Valiollah; Afzali, Niloufar; Mesa, Camilo A.; Mohammadpoor-Baltork, Iraj; Gimenez, Sixto Elsevier (2023)
      Photoelectrochemical (PEC) water splitting stands out as one of the most promising technologies to store solar energy into chemical bonds and decarbonize industry and transport. In the present study, we develop ...

    • closedAccess   Photon Up-Conversion with Lanthanide-Doped Oxide Particles for Solar H2 Generation 

      Gonell, Francisco; Haro, Marta; S. Sánchez, Rafael; Negro, Patricia; Mora-Sero, Ivan; Bisquert, Juan; Julian-Lopez, Beatriz; Gimenez, Sixto American Chemical Society (2014-05)
      Up-conversion (UC) of infrared (IR) photons into visible radiation constitutes a promising strategy to enhance the light harvesting efficiency of photovoltaic and photoelectrochemical devices. In the present study, we ...

    • closedAccess   Plasmonic versus catalytic effect of gold nanoparticles on mesoporous TiO2 electrodes for water splitting 

      Haro, Marta; Abargues, Rafael; Herraiz Cardona, Isaac; Martínez-Pastor, Juan P.; Gimenez, Sixto Elsevier (2014-10)
      Solar water splitting with metal oxide semiconductors constitutes a promising approach to the conversion of solar energy into chemical energy stored in the atomic bonds of hydrogen molecules. In the present study, we ...

    • closedAccess   Quantum Dot Based Heterostructures for Unassisted Photoelectrochemical Hydrogen Generation 

      Rodenas, Pau; Song, Taeseup; Sudhagar, P.; Marzari, Gabriela; Han, Hyungkyu; Badia Bou, Laura; Gimenez, Sixto; Fabregat-Santiago, Francisco; Mora-Sero, Ivan; Bisquert, Juan; Paik, Ungyu; Kang, Yong Soo Wiley (2013-02)
      TiO2 hollow nanowires (HNWs) and nanoparticles (NPs) constitute promising architectures for QDs sensitized photoanodes for H2 generation. We sensitize these structures with CdS/CdSe quantum dots by two different methods ...

    • closedAccess   Recombination in Quantum Dot Sensitized Solar Cells 

      Mora-Sero, Ivan; Gimenez, Sixto; Fabregat-Santiago, Francisco; Gómez, Roberto; Shen, Qing; toyoda, taro; Bisquert, Juan American Chemical Society (2009-11)
      Quantum dot sensitized solar cells (QDSCs) have attracted significant attention as promising third-generation photovoltaic devices. In the form of quantum dots (QDs), the semiconductor sensitizers have very useful and often ...

    • openAccess   Ru-based nanoparticles supported on carbon nanotubes for electrocatalytic hydrogen evolution: structural and electronic effects 

      Romero, Núria; Fenoll, Dídac A.; Gil Jiménez, Laia; Campos Jara, Sergi; Creus, Jordi; Martí Balaguer, Gerard; Heras-Domingo, Javier; Collière, Vincent; Mesa, Camilo A.; Gimenez, Sixto; Francàs Forcada, Laia; Rodriguez-Santiago, Luís; Solans Monfort, Xavier; Sodupe, Mariona; Bofill, Roger; PHILIPPOT, Karine; García-Antón, Jordi; Sala, Xavier Royal Society of Chemistry (2023-10-10)
      The performance of Ru-based nanoparticles (NPs) in the hydrogen evolution reaction (HER) relies on both their structural properties and the oxidation state of the metal. Herein, the versatility of the organometallic approach ...

    • openAccess   Selective contacts drive charge extraction in quantum dot solids via asymmetry in carrier transfer kinetics 

      Mora-Sero, Ivan; González Pedro, Victoria; Gimenez, Sixto; Bertoluzzi, Luca; Fabregat-Santiago, Francisco; Kemp, Kyle W.; Sargent, Edward H.; Bisquert, Juan Nature Publishing Group (2013)
      Colloidal quantum dot solar cells achieve spectrally selective optical absorption in a thin layer of solution-processed, size-effect tuned, nanoparticles. The best devices built to date have relied heavily on drift-based ...

    • openAccess   Self-supported ultra-active NiO-based electrocatalysts for the oxygen evolution reaction by solution combustion 

      Bucci, Alberto; García-Tecedor, Miguel; Corby, Sacha; Rao, Reshma R.; Martin-Diaconescu, Vlad; Oropeza, Freddy E; de la Peña O'Shea, Víctor Antonio; Durrant, James; Gimenez, Sixto; Lloret Fillol, Julio Royal Society of Chemistry (2021-04-20)
      The oxygen evolution reaction (OER) is a fundamental process to develop a technology that can drive energy transition towards renewable and sustainable fuels. Nevertheless, efficient and straightforward methodologies to ...

    • openAccess   Suppressing H2 Evolution and Promoting Selective CO2 Electroreduction to CO at Low Overpotentials by Alloying Au with Pd 

      Valenti, Marco; Prasad, Nitin P.; Kas, Recep; Bohra, Divya; Ma, Ming; Balasubramanian, Vignesh; Chu, Liangyong; Gimenez, Sixto; Bisquert, Juan; Dam, Bernard; Smith, Wilson A. (2019-03-11)
      CO2 electroreduction is a promising technology to produce chemicals and fuels from renewable resources. Polycrystalline and nanostructured metals have been tested extensively while less effort has been spent on understanding ...

    • openAccess   The Complex Role of Carbon Nitride as a Sensitizer in Photoelectrochemical Cells 

      Herraiz Cardona, Isaac; Yang, Xiaofei; Gimenez, Sixto; Antonietti, Markus; Shalom, Menny; Xu, Jingsan Wiley (2015-08)
      The role of carbon nitride (C3N4) as an absorber in a photoelectrochemical cell is reported. C3N4-sensitized TiO2 mesoporous film created via in-situ, vapor-transport growth results in a direct Ti–O–C bonding. The material ...

    • openAccess   The role of crystal facets and disorder on photo-electrosynthesis 

      Pastor, Ernest; Montañés, Laura; Gutiérrez-Blanco, Ana; Hegner, Franziska; Mesa, Camilo A.; Lopez, Nuria; Gimenez, Sixto Royal Society of Chemistry (2022-09-23)
      Photoelectrochemistry has the potential to play a crucial role in the storage of solar energy and the realisation of a circular economy. From a chemical viewpoint, achieving high conversion efficiencies requires subtle ...