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Concept

Non-métal

Publications associées (27)

Synthesis and Reactivity of an Anionic Diazoolefin

Rosario Scopelliti, Kay Severin, Farzaneh Fadaei Tirani, Zhaowen Dong, Bastiaan Kooij

Bent (hetero)allenes such as carbodicarbenes and carbodiphosphoranes can act as neutral C-donor ligands, and diverse applications in coordination chemistry have been reported. N-Heterocyclic diazoolefins are heterocumulenes, which can function in a similar ...

Wiley-VCH Verlag GmbH2023

Decoupling the Contributions of Different Instability Mechanisms to the PEMFC Performance Decay of Non-noble Metal O2-Reduction Catalysts

Vasiliki Tileli, Robin Pierre Alain Girod

Non-noble metal catalysts (NNMCs) hold the potential to replace the expensive Pt-based materials currently used to speed up the oxygen reduction reaction (ORR) in proton exchange membrane fuel cell (PEMFC) cathodes, but they feature poor durability that in ...

AMER CHEMICAL SOC2023

Exfoliated 2D Layered and Nonlayered Metal Phosphorous Trichalcogenides Nanosheets as Promising Electrocatalysts for CO2 Reduction

Michael Graetzel, Dan Ren, Hong Zhang, Yelin Hu

Two-dimensional (2D) materials catalysts provide an atomic-scale view on a fascinating arena for understanding the mechanism of electrocatalytic carbon dioxide reduction (CO2 ECR). Here, we successfully exfoliated both layered and nonlayered ultra-thin met ...

Wiley-VCH Verlag GmbH2023

Positive Streamer Initiation in SF6/CO2 Based on Zener's Field Ionization

Guang-Yu Sun

In this study, experiments were performed to measure the inception and breakdown voltages of SF6/CO2 mixed gases with varying mixing ratios at two different pressures (1 and 2 bar). Using the preliminary data obtained from the experiments, a 3D particle mo ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2023

Resonant Inelastic X-Ray Scattering Study of Electron-Exciton Coupling in High-T-c Cuprates

Fabrizio Carbone, Thorsten Schmitt, Ivan Madan, Christophe Berthod, Yi Tseng, Francesco Barantani

Explaining the mechanism of superconductivity in the high-T-c cuprates requires an understanding of what causes electrons to form Cooper pairs. Pairing can be mediated by phonons, the screened Coulomb force, spin or charge fluctuations, excitons, or by a c ...

American Physical Society2022

Phase transition of layer-stacked borophene under pressure

Oleg Yazyev, Quansheng Wu

The 8-Pmmn borophene, a boron analog of graphene, hosts tilted and anisotropic massless Dirac fermion quasiparticles owing to the presence of a distorted graphenelike sublattice. First-principles calculations show that stacked 8-Pmmn borophene is transform ...

AMER PHYSICAL SOC2022

Development of remote C-H bond functionalization of redox-active alcohol derivatives and oxidative transformations under photoredox catalysis

Alexandre Julien Florent Leclair

The development of radical-based remote C(sp3)-H functionalizations of redox-active alcohol derivatives, oxidative cycloaddition and rearrangement transformations under visible light photocatalysis constitute the basis of this thesis. The first chapter des ...

EPFL2021

Confinement of fluorine anions in nickel-based catalysts for greatly enhancing oxygen evolution activity

Pengzuo Chen, Yun Tong

Herein, we highlighted fluorine-anion-modification as a useful method for enhancing OER catalytic activity. Fluorine-anion-doped Ni foam exhibits an almost 10-fold enhancement in OER catalytic activity. Moreover, fluorine-anion-modification could be used a ...

Royal Society of Chemistry2020

Oxygen evolution reaction catalyzed by first-row transition metal oxides: stability and mechanism

Aliki Moysiadou

Water splitting offers the opportunity for storing solar energy and, thus, producing carbon-neutral and renewable solar fuels. The process, known as artificial photosynthesis, is limited by the electrocatalytic conversion of water into molecular oxygen. El ...

EPFL2020

Ab Initio Flexible Force Field for Metal-Organic Frameworks Using Dummy Model Coordination Bonds

Berend Smit, Seyedmohamad Moosavi

We present force fields developed from periodic density functional theory (DFT) calculations that can be used in classical molecular simulations to model M MOF-74 (M = Co, Fe, Mg, Mn, Ni, Zn) and its extended linker analogs. Our force fields are based on c ...

2019

Observation of methane filled hexagonal ice stable up to 150 GPa

Philippe Gillet, Richard Gaal, Livia Eleonora Bove Kado, Umbertoluca Ranieri

Gas hydrates consist of hydrogen-bonded water frameworks enclosing guest gas molecules and have been the focus of intense research for almost 40 y, both for their fundamental role in the understanding of hydrophobic interactions and for gas storage and ene ...

National Academy of Sciences2019

Mechanism suppressing charge recombination at iodine defects in CH3NH3PbI3 by polaron formation

Alfredo Pasquarello, Francesco Ambrosio, Julia Anna Wiktor

Metal-halide perovskites exhibit high efficiencies in photovoltaic applications and low recombination rates, despite the high concentrations of intrinsic defects. We here study the hole trapping at the negative iodine interstitial, which corresponds to the ...

Royal Society of Chemistry2018

Highly Active and Stable Iridium Pyrochlores for Oxygen Evolution Reaction

Nicola Marzari

Proton exchange membrane water electrolysis (PEMWE) is a promising technology for electricity-to-fuel conversion which allows for direct production of hydrogen from water. One of the key problems limiting widespread implementation of PEMWE into energy syst ...

Amer Chemical Soc2017

Two-dimensional polymeric structures and method for producing thereof

Demetri Psaltis, Jeffrey Alan Hubbell, Ye Pu, Ye Pu, Marcin Stefan Zielinski

The present invention relates to polymeric structures, in the form of flat membrane-like surfaces or micro- nanostructures such as capsules, characterized in that it comprises a substantially two-dimensional layer of covalently-bonded monomers of R-substit ...

2016

Electrolytes induce long-range orientational order and free energy changes in the H-bond network of bulk water

Michele Ceriotti, Sylvie Roke, Yixing Chen, Halil Ibrahim Okur, David Mark Wilkins, Carlos Alberto Macias Romero, Gabriele Tocci, Chung-Wen Liang, Nikolaos Gomopoulos

Electrolytes interact with water in many ways: changing dipole orientation, inducing charge transfer, and distorting the hydrogen-bond network in the bulk and at interfaces. Numerous experiments and computations have detected short-range perturbations that ...

American Association for the Advancement of Science (AAAS)2016

Bubble electrodeposition of gold porous nanocorals for the enzymatic and non-enzymatic detection of glucose

Sandro Carrara, Irene Taurino

Au nanocorals are grown on gold screen-printed electrodes (SPEs) by using a novel and simple one-step electro-deposition process. Scanning electron microscopy was used for the morphological characterization. The devices were assembled on a three-electrode ...

Elsevier2016

Primordial metallic melt in the deep mantle

Susannah McGregor Dorfman

Seismic tomography models reveal two large low shear velocity provinces (LLSVPs) that identify large-scale variations in temperature and composition in the deep mantle. Other characteristics include elevated density, elevated bulk sound speed, and sharp bo ...

Amer Geophysical Union2016

Exploring the aqueous vertical ionization of organic molecules by molecular simulation and liquid microjet photoelectron spectroscopy

Jeremy Samuel Arey, Peter Rudolf Tentscher, Jennifer Guerard

To study the influence of aqueous solvent on the electronic energy levels of dissolved organic molecules, we conducted liquid microjet photoelectron spectroscopy (PES) measurements of the aqueous vertical ionization energies (VIEaq) of aniline (7.49 eV), v ...

Amer Chemical Soc2015

The nature of the nonmetal-metal transition in LixCoO2 oxide

Florent Alexandre Boudoire

In this paper we analyze the nature of the nonmetal-metal transition in the LixCoO2 oxide (0.53

Elsevier2014

Mapping environmental partitioning properties of nonpolar complex mixtures by use of GCxGC

Jeremy Samuel Arey, Jonas Gros, Petros Dimitriou Christidis, Deedar Nabi

Comprehensive two-dimensional gas chromatography (GC × GC) is effective for separating and quantifying nonpolar organic chemicals in complex mixtures. Here we present a model to estimate 11 environmental partitioning properties for nonpolar analytes based ...

Amer Chemical Soc2014