Sustainable energy conversion & storage systems

Iridium Oxide Redox Gradient Material: Operando X‑ray Absorption of Ir Gradient Oxidation States during IrOx Bipolar Electrochemistry

Título :

Iridium Oxide Redox Gradient Material: Operando X‑ray Absorption of Ir Gradient Oxidation States during IrOx Bipolar Electrochemistry

Autores: Laura Fuentes-RodriguezLlibertat AbadLaura SimonelliDino Tonti, and Nieves Casañ-Pastor
Citation and DOI:
J. Phys. Chem. C 2021,
Publication Date:July 27, 2021
DOI: 10.1021/acs.jpcc.1c05012
PlumX: Iridium Oxide Redox Gradient Material: Operando X‑ray Absorption of Ir Gradient Oxidation States during IrOx Bipolar Electrochemistry
Electrodeposited iridium oxide (K1.7IrO0.8 (OH)2.2 × 1.8 H2O; also called IrOx) is among the best substrates for neural growth, decreasing impedance and stimulating cell growth, when used as a connected electrode. Without direct contact, it has been proven to stimulate neurons through a bipolar mechanism related to the conducting character of the material in the presence of remote electric fields.

Biomaterials, Energy

  • Hits: 235

Mechanically Tunable Lattice-Plasmon Resonances by Templated Self-Assembled Superlattices for Multi-Wavelength Surface-Enhanced Raman Spectroscopy

Título : Mechanically Tunable Lattice-Plasmon Resonances by Templated Self-Assembled Superlattices for Multi-Wavelength Surface-Enhanced Raman Spectroscopy
Autores: Mathias CharconnetChristian Kuttner, Javier PlouJuan Luis García-PomarAgustín MihiLuis M. Liz-MarzánAndreas Seifert
Citation and DOI:

Small Methods, 7 July 2021
DOI: 10.1002/smtd.202100453

PlumX: Mechanically Tunable Lattice-Plasmon Resonances by Templated Self-Assembled Superlattices for Multi-Wavelength Surface-Enhanced Raman Spectroscopy
Lattice plasmons, i.e., diffractively coupled localized surface plasmon resonances, occur in long-range ordered plasmonic nanostructures such as 1D and 2D periodic lattices. Such far-field coupled resonances can be employed for ultrasensitive surface-enhanced Raman spectroscopy (SERS), provided they are spectrally matched to the excitation wavelength.

Energy

  • Hits: 373

Observation of second sound in a rapidly varying temperature field in Ge

Título : Observation of second sound in a rapidly varying temperature field in Ge
Autores: Albert Beardo, Miquel López-Suárez, Luis Alberto Pérez, Lluc Sendra, Maria Isabel Alonso, Claudio Melis, Javier Bafaluy, Juan Camacho, Luciano Colombo, Riccardo Rurali, Francesc Xavier Alvarez and Juan Sebastián Reparaz,*
Citation and DOI: Science Advances  30 Jun 2021:
Vol. 7, no. 27, eabg4677
DOI: 10.1126/sciadv.abg4677
PlumX: Observation of second sound in a rapidly varying temperature field in Ge
Second sound is known as the thermal transport regime where heat is carried by temperature waves. Its experimental observation was previously restricted to a small number of materials, usually in rather narrow temperature windows. We show that it is possible to overcome these limitations by driving the system with a rapidly varying temperature field. High-frequency second sound is demonstrated in bulk natural Ge between 7 K and room temperature by studying the phase lag of the thermal response under a harmonic high-frequency external thermal excitation and addressing the relaxation time and the propagation velocity of the heat waves. These results provide a route to investigate the potential of wave-like heat transport in almost any material, opening opportunities to control heat through its oscillatory nature.

Energy

  • Hits: 363

Tuning the architectures and luminescence properties of Cu(I) compounds of phenyl and carboranyl pyrazoles: the impact of 2D versus 3D aromatic moieties in the ligand backbone

Título : Tuning the architectures and luminescence properties of Cu(I) compounds of phenyl and carboranyl pyrazoles: the impact of 2D versus 3D aromatic moieties in the ligand backbone
Autores: Joan Soldevila-Sanmartín, Eliseo Ruiz, Duane Choquesillo-Lazarte, Mark E. Light, Clara Viñas, Francesc Teixidor, Rosario Núñez, * Josefina Pons and  José G. Planas *
Citation and DOI: J. Mater. Chem. C, 2021, Advance Article
PlumX: Tuning the architectures and luminescence properties of Cu(i) compounds of phenyl and carboranyl pyrazoles: the impact of 2D versus 3D aromatic moieties in the ligand backbone
Incorporation of one or two o-carborane moieties at the backbone of the pyrazole ring was achieved by lithiation and nucleophilic addition onto the corresponding 3,5-dimethyl-1-(2-toluene-p-sulfonyloxyethyl)pyrazole. Two monosubstituted carboranyl pyrazoles (L2 and L3) and one disubstituted carboranyl pyrazole (L4) were synthesized and fully characterized. All new compounds, and the corresponding monosubstituted phenylderivative (L1) behave as N-type ligands upon coordination with CuI to afford different polynuclear Cu(I) compounds 1–4. Compounds 1–4 were fully characterized and their molecular structures were determined by X-ray diffraction. It is noteworthy that whereas the pyrazolylphenyl ligand L1, without o-carborane, provides a 1D coordination polymer (1), ligands containing carborane, L2–L3, affords 0D coordination compounds 2 and 3, and disubstituted carboranyl pyrazole ligand L4 gives rise to a 3D coordination polymer.

Energy

  • Hits: 339

Accelerating organic solar cell material's discovery: high-throughput screening and big data

Título : Accelerating organic solar cell material's discovery: high-throughput screening and big data
Autores: Xabier Rodríguez-Martínez, Enrique Pascual-San-José and Mariano Campoy-Quiles
Citation and DOI:

Energy Environ. Sci., 2021, Advance Article
DOI: https://doi.org/10.1039/D1EE00559F

PlumX: Accelerating organic solar cell material's discovery: high-throughput screening and big data
The discovery of novel high-performing materials such as non-fullerene acceptors and low band gap donor polymers underlines the steady increase of record efficiencies in organic solar cells witnessed during the past years. Nowadays, the resulting catalogue of organic photovoltaic materials is becoming unaffordably vast to be evaluated following classical experimentation methodologies: their requirements in terms of human workforce time and resources are prohibitively high, which slows momentum to the evolution of the organic photovoltaic technology.

Energy

  • Hits: 453

Boost of Charge Storage Performance of Graphene Nanowall Electrodes by Laser-Induced Crystallization of Metal Oxide Nanostructures

Autores: Yasmín Esqueda-Barrón, Angel Pérez Del Pino, Pablo García Lebière, Arevik Musheghyan-Avetisyan, Enric Bertran-Serra, Enikö György, Constantin Logofatu
Citation and DOI:

ACS Appl Mater Interfaces. 21;13(15):17957-17970.
Doi: 10.1021/acsami.1c00951. 2021 
Erratum in: ACS Appl Mater Interfaces. 2021 May 20;: PMID: 33843185.

PlumX: Boost of Charge Storage Performance of Graphene Nanowall Electrodes by Laser-Induced Crystallization of Metal Oxide Nanostructures
Major research efforts are being carried out for the technological advancement to an energetically sustainable society. However, for the full commercial integration of electrochemical energy storage devices, not only materials with higher performance should be designed and manufactured but also more competitive production techniques need to be developed.

Energy

  • Hits: 421

Unveiling Planar Defects in Hexagonal Group IV Materials

Autores:

Elham M. T. Fadaly, Anna Marzegalli, Yizhen Ren, Lin Sun, Alain Dijkstra, Diego de Matteis, Emilio Scalise, Andrey Sarikov, Marta De Luca, Riccardo Rurali, Ilaria Zardo, Jos E. M. Haverkort, Silvana Botti, Leo Miglio, Erik P. A. M. Bakkers, and Marcel A. Verheijen

Citation and DOI:
Nano Lett. 2021, 21, 8, 3619–3625
Publication Date:April 12, 2021
https://doi.org/10.1021/acs.nanolett.1c00683
PlumX: Unveiling Planar Defects in Hexagonal Group IV Materials
Recently synthesized hexagonal group IV materials are a promising platform to realize efficient light emission that is closely integrated with electronics. A high crystal quality is essential to assess the intrinsic electronic and optical properties of these materials unaffected by structural defects. Here, we identify a previously unknown partial planar defect in materials with a type I3 basal stacking fault and investigate its structural and electronic properties.

Energy

  • Hits: 465

Battery Materials Design Essentials

Autores: M. Rosa Palacin*
Citation and DOI:
Acc. Mater. Res. 2021, XXXX, XXX, XXX-XXX
Publication Date:April 13, 2021
https://doi.org/10.1021/accountsmr.1c00026
PlumX: Battery Materials Design Essentials
The advanced materials industry is one of the leading technology sectors worldwide. The development of such materials is at the core of the technological innovations and has been possible in the last century thanks to the transition from “observational” science to “control” science.

Energy

  • Hits: 615

Study of nanostructured ultra-refractory Tantalum-Hafnium-Carbide electrodes with wide electrochemical stability window

Autores: Emerson Coy, Visnja Babacic, Luis Yate, Karol Załęski, Yeonho Kim, Juan Sebastián Reparaz, Bernhard Dörling, Bartlomiej Graczykowski, Igor Iatsunskyi, Katarzyna Siuzdak
Citation and DOI: Chemical Engineering Journal, Volume 415, 2021, 128987, ISSN 1385-8947
https://www.sciencedirect.com/science/article/pii/S1385894721005805
PlumX: Study of nanostructured ultra-refractory Tantalum-Hafnium-Carbide electrodes with wide electrochemical stability window
Transition metal carbides have gathered increasing attention in energy and electrochemistry applications, mainly due to their high structural and physicochemical properties. Their high refractory properties have made them an ideal candidate coating technology and more recently their electronic similarity to the platinum group has expanded their use to energy and catalysis. Here, we demonstrate that the nanostructuring and stoichiometry control of the highest melting point material to this date (Ta-Hf-C) results in outstanding electrochemical stability.

Energy

  • Hits: 474

pH-Responsive Self-Assembly of Amyloid Fibrils for Dual Hydrolase-Oxidase Reactions

Autores: Marta Díaz-Caballero, Susanna Navarro, Miquel Nuez-Martínez, Francesca Peccati, Luis Rodríguez-Santiago, Mariona Sodupe, Francesc Teixidor, and Salvador Ventura*
Citation and DOI:
ACS Catal. 2021, 11, 2, 595–607
DOI: https://doi.org/10.1021/acscatal.0c03093
PlumX: pH-Responsive Self-Assembly of Amyloid Fibrils for Dual Hydrolase-Oxidase Reactions
There is an increasing interest in synthetic systems that can execute bioinspired chemical reactions without requiring the complex structures that characterize enzymes in their components. The hierarchical self-assembly of peptides provides a means to create catalytic microenvironments. Ideally, as it occurs in enzymes, the catalytic activity of peptide nanostructures should be reversibly regulated. In a typical enzyme mimetic design, the peptide’s self-assembling and catalytic activities are segregated into different regions of the sequence.

Energy

  • Hits: 527

Noncovalently Linked Metallacarboranes on Functionalized Magnetic Nanoparticles as Highly Efficient, Robust, and Reusable Photocatalysts in Aqueous Medium

Autores: Isabel Guerrero, Arpita Saha, Jewel Ann Maria XavierJewel Ann Maria Xavier, Clara Viñas, Isabel Romero*, and Francesc Teixidor*
Citation and DOI:
ACS Appl. Mater. Interfaces 2020, 12, 50, 56372–56384
Publication Date:December 7, 2020
DOI: https://doi.org/10.1021/acsami.0c17847
PlumX: Noncovalently Linked Metallacarboranes on Functionalized Magnetic Nanoparticles as Highly Efficient, Robust, and Reusable Photocatalysts in Aqueous Medium
A successful homogeneous photoredox catalyst has been fruitfully heterogenized on magnetic nanoparticles (MNPs) coated with a silica layer, keeping intact its homogeneous catalytic properties but gaining others due to the easy magnetic separation and recyclability. The amine-terminated magnetic silica nanoparticles linked noncovalently to H[3,3′-Co(1,2-C2B9H11)2] (H[1]), termed MSNPs-NH2@H[1], are highly stable and do not produce any leakage of the photoredox catalyst H[1] in water. The magnetite MNPs were coated with SiO2 to provide colloidal stability and silanol groups to be tethered to amine-containing units.

Energy

  • Hits: 475

Large-Scale Soft-Lithographic Patterning of Plasmonic Nanoparticles

Autores: Naihao Chiang*, Leonardo Scarabelli*, Gail A. Vinnacombe-Willson, Luis A. Pérez, Camilla Dore, Agustín Mihi, Steven J. Jonas*, and Paul S. Weiss*
Citation and DOI:
ACS Materials Lett. 2021, 3, XXX, 282–289
Publication Date:February 12, 2021
DOI: https://doi.org/10.1021/acsmaterialslett.0c00535
PlumX: Large-Scale Soft-Lithographic Patterning of Plasmonic Nanoparticles
Micro- and nanoscale patterned monolayers of plasmonic nanoparticles were fabricated by combining concepts from colloidal chemistry, self-assembly, and subtractive soft lithography. Leveraging chemical interactions between the capping ligands of pre-synthesized gold colloids and a polydimethylsiloxane stamp, we demonstrated patterning gold nanoparticles over centimeter-scale areas with a variety of micro- and nanoscale geometries, including islands, lines, and chiral structures (e.g., square spirals).

Energy

  • Hits: 646

Disentangling Electron–Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals

Autores: Andrea Rubino, Adrián Francisco-López, Alex J. Barker, Annamaria Petrozza, Mauricio E. Calvo, Alejandro R. Goñi*, and Hernán Míguez*
Citation and DOI:
J. Phys. Chem. Lett. 2021, 12, 1, 569–575
Publication Date:December 31, 2020
https://doi.org/10.1021/acs.jpclett.0c03042
PlumX: Disentangling Electron–Phonon Coupling and Thermal Expansion Effects in the Band Gap Renormalization of Perovskite Nanocrystals
The complex electron–phonon interaction occurring in bulk lead halide perovskites gives rise to anomalous temperature dependences, like the widening of the electronic band gap as temperature increases. However, possible confinement effects on the electron–phonon coupling in the nanocrystalline version of these materials remain unexplored. Herein, we study the temperature (ranging from 80 K to ambient) and hydrostatic pressure (from atmospheric to 0.6 GPa) dependence of the photoluminescence of ligand-free methylammonium lead triiodide nanocrystals with controlled sizes embedded in a porous silica matrix.

Energy

  • Hits: 570

Laser fabrication of hybrid electrodes composed of nanocarbons mixed with cerium and manganese oxides for supercapacitive energy storage

Autores: Pablo García Lebière, * Ángel Pérez del Pino, Guillem Domènech Domingo, Constantin Logofatu, Immaculada Martínez-Rovira, Ibraheem Yousef and Enikö György
Citation and DOI: J. Mater. Chem. A, 2021, Advance Article
https://doi.org/10.1039/D0TA06756C
PlumX: Laser fabrication of hybrid electrodes composed of nanocarbons mixed with cerium and manganese oxides for supercapacitive energy storage
Novel composite materials are being investigated for improving the energy storage performance of electrochemical capacitors. For this goal, synergistic effects via the combination of diverse types of materials are crucial. In this work, electrodes composed of reduced graphene oxide, multiwall carbon nanotubes, as well as cerium and manganese oxides were fabricated through reactive inverse matrix-assisted pulsed laser evaporation (RIMAPLE).

Energy

  • Hits: 558

Predicting the photocurrent–composition dependence in organic solar cells

Autores: Xabier Rodríguez-Martínez, Enrique Pascual-San-José, Zhuping Fei, Martin Heeney, Roger Guimerà and  Mariano Campoy-Quiles
Citation and DOI: Energy Environ. Sci., 2021, Advance Article
https://doi.org/10.1039/D0EE02958K
PlumX: Predicting the photocurrent–composition dependence in organic solar cells

The continuous development of improved non-fullerene acceptors and deeper knowledge of the fundamental mechanisms governing performance underpin the vertiginous increase in efficiency witnessed by organic photovoltaics. While the influence of parameters like film thickness and morphology are generally understood, what determines the strong dependence of the photocurrent on the donor and acceptor fractions remains elusive.

Energy

  • Hits: 586

Enhanced Directional Light Extraction from Patterned Rare‐Earth Phosphor Films

Autores: Elena Cabello‐Olmo, Pau Molet, Agustín Mihi, Gabriel Lozano, Hernán Míguez
Citation and DOI: Adv. Optical Mater. 2020, 2001611.
DOI: https://doi.org/10.1002/adom.202001611
PlumX: Enhanced Directional Light Extraction from Patterned Rare‐Earth Phosphor Films

The combination of light‐emitting diodes (LEDs) and rare earth (RE) phosphors as color‐converting layers comprises the basis of solid‐state lighting. Indeed, most LED lamps include a photoluminescent coating made of phosphor material, i.e., crystalline matrix suitably doped with RE elements, to produce white light from a blue or ultraviolet LED chip.

Energy

  • Hits: 581

Quasiballistic phonon transport from first principles

Autores: Pol Torres, Miquel Royo, Miquel López-Suárez, Junichiro Shiomi, and Riccardo Rurali
Citation and DOI: Phys. Rev. B 102, 144305 – Published 26 October 2020
DOI: https://doi.org/10.1103/PhysRevB.102.144305
PlumX: Quasiballistic phonon transport from first principles
At short length scales phonon transport is ballistic: the thermal resistance of semiconductors and insulators is quantized and length independent. At long length scales, on the other hand, transport is diffusive and resistance arises as a result of the scattering processes experienced by phonons. In many cases of interest, however, these two transport regimes coexist. Here we propose a first-principles approach to treat quasiballistic phonon transport where diffusive and ballistic phonons receive separate theoretical treatments.

Energy

  • Hits: 678

Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices

Título : Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices
Autores: P. Ferrando-Villalba, Shunda Chen, A. F. Lopeandía, F. X. Alvarez, M. I. Alonso, M. Garriga, J. Santiso, G. Garcia, A. R. Goñi, D. Donadio*, and J. Rodríguez-Viejo*
Citation and DOI:
J. Phys. Chem. C 2020, 124, 36, 19864–19872
Publication Date:August 11, 2020
https://doi.org/10.1021/acs.jpcc.0c06410
PlumX: Beating the Thermal Conductivity Alloy Limit Using Long-Period Compositionally Graded Si1–xGex Superlattices
Superlattices with scattering mechanisms at multiple length scales efficiently scatter phonons at all relevant wavelengths and provide a convenient route to reduce thermal transport. Here, we show, both experimentally and by atomistic simulations, that SiGe superlattices with well-established compositional gradients and a sufficient number of interfaces exhibit extremely low thermal conductivity. 

Energy

  • Hits: 664

Homoconjugation in Light-Emitting Poly(phenylene methylene)s: Origin and Pressure-Enhanced Photoluminescence

Autores: Aleksandr Perevedentsev*, Adrián Francisco-López, Xingyuan Shi, Andreas Braendle, Walter R. Caseri, Alejandro R. Goñi, and Mariano Campoy-Quiles
Citation and DOI:
Macromolecules 2020, 53, 17, 7519–7527
Publication DateAugust 26, 2020 
DOI: https://doi.org/10.1021/acs.macromol.0c01153
PlumX: Homoconjugation in Light-Emitting Poly(phenylene methylene)s: Origin and Pressure-Enhanced Photoluminescence
The surprising optical properties of the non-π-conjugated polymer poly(phenylene methylene) (PPM) and its derivatives—that is, absorption in the 350–450 nm and photoluminescence (PL) in the 400–600 nm spectral regions—have been attributed to chromophores formed by homoconjugation along the polymer chain. The enabling role of homoconjugation, however, was hitherto ascertained primarily by excluding alternative origins of luminescence.

Energy

  • Hits: 721

Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures

Autores: Camilla Dore, Bernhard Dörling, Juan Luis Garcia‐Pomar, Mariano Campoy‐Quiles, Agustín Mihi
Citation and DOI: Small 2020, 2004795
 
PlumX: Hydroxypropyl Cellulose Adhesives for Transfer Printing of Carbon Nanotubes and Metallic Nanostructures
Transfer printing is one of the key nanofabrication techniques for the large‐scale manufacturing of complex device architectures. It provides a cost‐effective and high‐throughput route for the integration of independently processed materials into spatially tailored architectures.

Energy

  • Hits: 1077

High‐Throughput Nanofabrication of Metasurfaces with Polarization‐Dependent Response

Metal nanostructures offer exciting ways to manage light at the nanoscale exploited in fields such as imaging, sensing, energy conversion, and information processing. The optical response of the metallic architectures can be engineered to exhibit photonic properties that span from plasmon resonances to more complex phenomena such as negative refractive index, optical chirality, artificial magnetism, and more.

Energy

  • Hits: 796

Electrodeposited Negative Index Metamaterials with Visible and Near Infrared Response

Negative index metamaterials have revolutionized the field of photonics because of their unconventional electromagnetic properties absent in naturally occurring materials. It remains a challenge however, to achieve strong negative refractive index at optical frequencies over large areas in a device compatible fashion.

Energy

  • Hits: 753

Towards photovoltaic windows: scalable fabrication of semitransparent modules based on non-fullerene acceptors via laser-patterning

Semitransparent organic photovoltaics (OPV) possess unique properties that make them highly appealing for their integration into semitransparent architectonic elements such as windows or glazings. In order to provide sufficient transparency, non-opaque electrodes and thin photoactive layers are typically used, thus limiting the light-harvesting capacity.

Energy

  • Hits: 1124

Photoflexoelectric effect in halide perovskites

Harvesting environmental energy to generate electricity is a key scientific and technological endeavour of our time. Photovoltaic conversion and electromechanical transduction are two common energy-harvesting mechanisms based on, respectively, semiconducting junctions and piezoelectric insulators.

Energy

  • Hits: 1002

Large area metasurfaces made with spherical silicon resonators

Pau Molet, Luz Karimé Gil-Herrera, Juan Luis Garcia-Pomar, Niccolò Caselli, Álvaro Blanco, Cefe López, Agustín Mihi. Nanophotonics. Received January 16, 2020; revised February 20, 2020; accepted February 22, 2020.

  • Hits: 881

Narrow linewidth quantum emitters in electron-beam shaped polymer

Carlotta Ciancico, Kevin Schädler, Sofia Pazzagli, Maja Colautti, Pietro Lombardi, Johann Osmond, Camilla Dore, Agustin Mihi, Anna Ovvyan, Wolfram HP Pernice, Enrico Berretti, Alessandro Lavacchi, Costanza Toninelli, Frank H.L. Koppens, Antoine Reserbat-Plantey. ACS Photonics

Energy

  • Hits: 1058

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