Publications

Evolutionary selection growth of two-dimensional materials on polycrystalline substrates

Journal: Nature Materials

There is a demand for manufacturing 2D materials with the ultimate quality of single crystals and arbitrary size. Usually, epitaxial growth is considered the method of choice1 in prepar-ing single crystalline thin films but it in turn requires single crystal substrates for deposition. Here we present a different...

Bis-lactam-1,10-phenanthroline (BLPhen), a New Type of Preorganized Mixed N,O-Donor Ligand That Separates Am(III) over Eu(III) with Exceptionally High Efficiency

Journal: Inorganic Chemistry

We report a new family of preorganized bis-lactam-1,10-phenanthroline (BLPhen) complexants that possess both hard and soft donor atoms within a convergent cavity and show unprecedented extraction strength for the trivalent f-block metal ions. BLPhen ligands with saturated and unsaturated δ-lactam rings have notable...

Theoretical prediction of Am(III)/Eu(III) selectivity to aid the design of actinide-lanthanide separation agents

Journal: Dalton Transactions

Selective extraction of minor actinides from lanthanides is a critical step in the reduction of radiotoxicity of spent nuclear fuels. However, the design of suitable ligands for separating chemically similar 4f- and 5f-block trivalent metal ions poses a significant challenge. First-principles calculations should...

Real‐Time Observation of Order‐Disorder Transformation of Organic Cations Induced Phase Transition and Anomalous Photoluminescence in Hybrid Perovskites

Journal: Advanced Materials

A fundamental understanding of the interplay between the microscopic structure and macroscopic optoelectronic properties of organic‐inorganic hybrid perovskite materials is essential to design new materials and improve device performance. However, how exactly the organic cations affect the structural...

Supersonic propagation of lattice energy by phasons in fresnoite

Journal: Nature Communications

Controlling the thermal energy of lattice vibrations separately from electrons is vital to many applications including electronic devices and thermoelectric energy conversion. To remove heat without shorting electrical connections, heat must be carried in the lattice of electrical insulators. Phonons are limited to...

On the structure dependence of CO oxidation over CeO 2 nanocrystals with well-defined surface planes

Journal: Journal of Catalysis

CO oxidation is a model reaction for probing the redox property of ceria-based catalysts. In this study, CO oxidation was investigated over ceria nanocrystals with defined surface planes (nanoshapes) including rods ({110}+{100}), cubes ({100}), and octahedra ({111}). To understand the strong dependence of CO...

A physical catalyst for the electrolysis of nitrogen to ammonia

Journal: Science Advances

Ammonia synthesis consumes 3 to 5% of the world’s natural gas, making it a significant contributor to greenhouse gas emissions. Strategies for synthesizing ammonia that are not dependent on the energy-intensive and methane-based Haber-Bosch process are critically important for reducing global energy consumption and...

Acid–Base Reactivity of Perovskite Catalysts Probed via Conversion of 2-Propanol over Titanates and Zirconates

Journal: ACS Catalysis

Although perovskite catalysts are well-known for their excellent redox property, their acid–base reactivity remains largely unknown. To explore the potential of perovskites in acid–base catalysis, we made a comprehensive investigation in this work on the acid–base properties and reactivity of a series of selected...

Controlling Reaction Selectivity through the Surface Termination of Perovskite Catalysts

Journal: Wiley Online Library

Although perovskites have been widely used in catalysis, tuning of their surface termination to control reaction selectivity has not been well established. In this study, we employed multiple surface-sensitive techniques to characterize the surface termination (one aspect of surface reconstruction) of SrTiO3...

Direct Neutron Spectroscopy Observation of Cerium Hydride Species on a Cerium Oxide Catalyst

Journal: Journal of the American Chemical Society (JACS)

Ceria has recently shown intriguing hydrogenation reactivity in catalyzing alkyne selectively to alkenes. However, the mechanism of the hydrogenation reaction, especially the activation of H2, remains experimentally elusive. In this work, we report the first direct spectroscopy evidence for the presence...

Observation of coherent elastic neutrino-nucleus scattering

Journal: Science

The coherent elastic scattering of neutrinos off nuclei has eluded detection for four decades, even though its predicted cross-section is the largest by far of all low-energy neutrino couplings. This mode of interaction provides new opportunities to study neutrino properties, and leads to a miniaturization of...

Structure and thermochemistry of perrhenate sodalite and mixed guest perrhenate/pertechnetate sodalite

Journal: Environmental Science and Technology

Treatment and immobilization of technetium-99 (99Tc) contained in reprocessed nuclear waste and present in contaminated subsurface systems represents a major environmental challenge. One potential approach to managing this highly mobile and long-lived radionuclide is immobilization into micro- and meso-porous...

Processing of Onion-like Carbon for Electrochemical Capacitors

Journal: ECS Journal of Solid State Science and Technology

Multi-shell fullerenes known as onion-like carbon (OLC) are especially attractive in applications relative to energy storage, such as electrochemical capacitors, due to a near-spherical shape of particles, their nanoscale diameters and high conductivity leading to fast rate performance. Because of this, onion-like...

Computational insight into the capacitive performance of graphene edge planes

Journal: Carbon

Recent experiments have shown that electric double-layer capacitors utilizing electrodes consisting of graphene edge plane exhibit higher capacitance than graphene basal plane. However, theoretical understanding of this capacitance enhancement is still limited. Here we applied a self-consistent joint density...

Nano-scale synthesis of the complex silicate minerals forsterite and enstatite

Journal: Journal of Colloid and Interface Science

Olivine is a relatively common family of silicate minerals in many terrestrial and extraterrestrial environments, and is also useful as a refractory ceramic. A capability to synthesize fine particles of olivine will enable additional studies on surface reactivity under geologically relevant conditions. This paper...

CO2 Capture from Ambient Air by Crystallization with a Guanidine Sorbent

Journal: Angewandte Chemie International Edition

Carbon capture and storage is an important strategy for stabilizing the increasing concentration of atmospheric CO2 and the global temperature. A possible approach toward reversing this trend and decreasing the atmospheric CO2 concentration is to remove the CO2 directly from air (direct air capture). Herein we...

Membrane-Based Gas Separation Accelerated by Hollow Nanosphere Architectures

Journal: Advanced Materials

The coupling of hollow carbon nanospheres with triblock copolymersis a promising strategy to fabricate mixed-matrix membranes. This is because the symmetric microporous shells combine with the hollow space to promote gas transport, and the unique soft–rigid molecular structure of triblock copolymers can accommodate...

A Novel Electrolyte Salt Additive for Lithium-Ion Batteries with Voltages Greater than 4.7 V

Journal: Advanced Energy Materials

Lithium bis(2-methyl-2-fluoromalonato)borate (LiBMFMB), as an additive for LiNi0.5Mn1.5O4, exhibits improved efficiencies and cycling stability. Cyclic voltammograms indicate the cells with additive form good solid-electrolyte interphases (SEIs) during the first cycle, whereas no additive cell needs more cycles to...

Fast MAS 1H NMR Study of Water Adsorption and Dissociation on the (100) Surface of Ceria Nanocubes: A Fully Hydroxylated, Hydrophobic Ceria Surface

Journal: The Journal of Physical Chemistry C

1H nuclear magnetic resonance (NMR) spectroscopy was used to study hydroxylic surface species on ceria nanocubes, a crystalline, high-surface-area CeO2 that presents mostly (100) facets. Water adsorption and desorption experiments in combination with fast magic angle spinning (MAS, 20–40 kHz) 1H NMR provide high-...

Ion-Gated Gas Separation through Porous Graphene

Journal: Nano Letters

Porous graphene holds great promise as a one-atom-thin, high-permeance membrane for gas separation, but to precisely control the pore size down to 3–5 Å proves challenging. Here we propose an ion-gated graphene membrane comprising a monolayer of ionic liquid-coated porous graphene to dynamically modulate the pore...

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