We report selective electrocatalytic reduction of carbon dioxide to monoxide on gold nanoparticles (NPs) in 0.5 M KHCO3 at 25 °C. Among monodisperse 4, 6, 8, and 10 nm NPs tested, the 8 Au show maximum Faradaic efficiency (FE) (up 90% -0.67 V vs reversible hydrogen electrode, RHE). Density functional theory calculations suggest that more edge sites (active for CO evolution) than corner competitive H2 evolution reaction) NP surface facilitates stabilization intermediates, such as COOH*,...

Nitrogen-doped carbon nanotubes (NCNTs) have been considered as a promising electrocatalyst for carbon-dioxide-reduction reactions, but two fundamental chemistry questions remain obscure: 1) What are the active centers with respect to various defect species and 2) what is role of density on selectivity NCNTs? The aim this work address these questions. catalytic activity NCNTs depends structural nature nitrogen in CNTs density. Comparing pristine CNTs, presence graphitic pyridinic...

Abstract Nitrogen‐doped carbon nanotubes (NCNTs) have been considered as a promising electrocatalyst for carbon‐dioxide‐reduction reactions, but two fundamental chemistry questions remain obscure: 1) What are the active centers with respect to various defect species and 2) what is role of density on selectivity NCNTs? The aim this work address these questions. catalytic activity NCNTs depends structural nature nitrogen in CNTs density. Comparing pristine CNTs, presence graphitic pyridinic...

High energy density lithium-ion (Li-ion) batteries are commonly used nowadays. Three decades’ worth of intense research has led to a good understanding on several aspects such batteries. But, the issue their safe storage and transportation is still not widely understood from materials chemistry perspective. Current international regulations require Li-ion cells be shipped at 30% SOC (State Charge) or lower. In this article, reasons behind requirement for shipping firstly reviewed then...

This paper reports the measurement of vibration spectra hydrogen sorbed by molybdenum sulphide and alumina supported sulphide. The intensities support idea that is bonded to one or more sulphur atoms rather than metal as case for 2H–H0.1TaS2. Preliminary neutron diffraction data this conclusion.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNeutron diffraction study of cubic ice nucleation in a porous silica networkD. C. Steytler, J. Dore, and WrightCite this: Phys. Chem. 1983, 87, 14, 2458–2459Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 1983https://pubs.acs.org/doi/10.1021/j100237a003https://doi.org/10.1021/j100237a003research-articleACS PublicationsRequest reuse permissionsArticle Views378Altmetric-Citations86LEARN...

Neuro-stimulation has wide ranging clinical and research potential but this is currently limited either by low resolution, penetration or highly invasive procedures. It been reported in previous studies that ultrasound able to elicit a neuro-stimulatory effect at higher resolution than other non-invasive approaches both the underlying mechanism makes possible practical details of how it can be implemented are still poorly understood. The current study identified main issues need resolved...

We study correlated two-level quantum dots, coupled in effective one-channel fashion to metallic leads, with electron interactions including on-level and interlevel Coulomb repulsions, as well the interorbital Hund's rule exchange favoring spin-1 state relevant sector of free dot. For arbitrary dot occupancy, underlying phases, phase transitions (QPTs), thermodynamics, single-particle dynamics, electronic transport properties are considered, direct comparison is made conductance experiments...

The complementary techniques of inelastic neutron scattering and high resolution transmission electron microscopy have been used to study different aspects the constitution several forms lead dioxide. techniques, which are particularly sensitive presence hydrogenous species, indicate that dioxide can accommodate widely varying amounts hydrogen. vibration spectra, recorded after various dehydration procedures, do not show sharp characteristic vibrations consistent with hydroxyl groups similar...

Measurements of quasi-elastic neutron scattering have enabled us to characterize the rotational and translational dynamics an ethylene molecule adsorbed in sodium zeolite 13X. We find that a model for describing motion terms 180° jump rotation about axis perpendicular surface passing through mid-point satisfactorily explains data. Uniaxial other principal axes is incompatible with our measurements. From this we deduce executes 20 jumps between each translation step.

We examine several effects of an applied magnetic field on Anderson-type models for both single- and two-level quantum dots, we make direct comparison between numerical renormalization group (NRG) calculations recent conductance measurements. On the theoretical side, focus is magnetization, single-particle dynamics, zero-bias conductance, with emphasis universality arising in strongly correlated regimes, including a method to obtain scaling behavior field-induced Kondo resonance shifts over...

Abstract This study is a structured literature review of published ResonantAcoustic® Mixing (RAM) literature, considering the benefits and constraints using RAM. Focussing on how this will affect future production rubbery composite rocket propellants. The main RAM were found to be shorter mixing time, versatility ability mix higher viscosities than conventional mixers. Facilitating next generation propellants with improved performance mechanical properties. Mixed in‐situ overcomes viscosity...

We show herein that electrode-level effects of commercially-available hard carbon (HC) material, as a function the HC loading, can have two surprising positive outcomes in sodium-ion (Na-ion) pouch cells. First, electrode’s plating-free volumetric capacity actually increases its loading (and areal capacity) decreases, and secondly, at sub-30 min charging times for Na-ion anode, be better vs graphite anode lithium-ion (Li-ion) cells electrode-level, significantly higher than latter sub-20...

Inelastic neutron scattering (I.N.S.) spectra of C2H4 adsorbed, at two coverages, on a Ag+ exchanged 13X zeolite have been measured. Several the modes vibration adsorbed gas relative to surface observed. These assigned from considerations their intensities, shifts deuteration (C2D4 and trans-C2D2H2) by comparison with I.N.S. some organometallic complexes. The Na+ form were also obtained; however, no firm assignments could be made.

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Neutron scattering experiments on polymethylphenylsiloxane, polypropylene oxide, polyiso butylene and polyethylene oxide show broadening in the quasi-elastic region similar to that previously reported from polydimethylsiloxane. Measurements partially deuterated samples confirm effect arises segmental diffusive motion, rather than rotations of pendant side groups. The temperature dependence this motion gives activation energies which are smaller for self-diffusion obtained longer time-scale...

S. Vasudevan, J. M. Thomas, C. Wright and Sampson, Chem. Soc., Commun., 1982, 418 DOI: 10.1039/C39820000418

Vibrations of ethylene on a zeolite surface have been observed, at two different coverages, by incoherent inelastic neutron scattering.

The inelastic neutron scattering spectra of π-C5H5Rh(C2H4)2, π-C5H5Rh(C2H4)SO2 and [Rh-(C2H4)2Cl]2 have been measured the torsional vibrations their ethylene groups assigned. In diethylene compounds in-phase out-of-phase torsions observed for [Rh(C2H4)2Cl]2 frequencies are 112 ± 5 226 cm–1. A model has proposed interaction between experimentally expressed in terms constants derived from this model.

The thermally stimulated desorption (TSD) curves of oxygen (AMU 16) and cadmium from Class I photoconducting CdS platelets, grown in a N2H2S atmosphere, were studied the temperature range room to 550°C. Substantial with maximum around 350°C was observed. TSD curve for exhibited plateau near 400°C, attributed overstoichiometric thin layer crystal surface, followed by sharp rise above 470°C associated evaporation. Changes spectral distribution photocurrent (SDP) dark current observed upon...