Publications

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...

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...

Analysis of gas membrane ultra-high purification of small quantities of mono-isotopic silane

Journal: Journal of Membrane Science

A small quantity of high-value, crude, mono-isotopic silane is a prospective gas for a small-scale, high-recovery, ultra-high membrane purification process. This is an unusual application of gas membrane separation for which we provide a comprehensive analysis of a simple purification model. The goal is to develop...

Surfactant-Assisted Stabilization of Au Colloids on Solids for Heterogeneous Catalysis

Journal: Angewandte Chemie International Edition

The stabilization of surfactant-assisted synthesized colloidal noble metal nanoparticles (NPs, such as Au NPs) on solids is a promising strategy for preparing supported nanocatalysts for heterogeneous catalysis because of their uniform particle sizes, controllable shapes, and tunable compositions. However,...

An Iterative Phase-Space Explicit Discontinuous Galerkin Method for Stellar Radiative Transfer in Extended Atmospheres

Journal: Journal of Quantitative Spectroscopy and Radiative Transfer

A phase-space discontinuous Galerkin (PSDG) method is presented for the solution of stellar radiative transfer problems. It allows for greater adaptivity than competing methods without sacrificing generality. The method is extensively tested on a spherically symmetric, static, inverse-power-law scattering...

Novel Acid Catalysts from Waste-Tire-Derived Carbon: Application in Waste–to-Biofuel Conversion

Journal: Chemistry Select

Many inexpensive biofuel feedstocks, including those containing free fatty acids (FFAs) in high concentrations, are typically disposed of as waste due to our inability to efficiently convert them into usable biofuels. Here we demonstrate that carbon derived from waste tires could be functionalized with sulfonic...

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...

Tilt Grain Boundary Topology Induced by Substrate Topography

Journal: ACS Nano

Synthesis of two-dimensional (2D) crystals is a topic of great current interest, since their chemical makeup, electronic, mechanical, catalytic, and optical properties are so diverse. A universal challenge, however, is the generally random formation of defects caused by various growth factors on flat surfaces. Here...

Acoustic Detection of Phase Transitions at the Nanoscale

Journal: Advanced Functional Materials

Materials near structural phase transitions fi nd applications in a wide range of devices. Typically, phase transitions are determined macroscopically through measurements of relevant order parameters and related property coeffi cients. Here, a method for understanding electric fi eld induced phase transitions in...

Continuously Controlled Optical Band Gap in Oxide Semiconductor Thin Films

Journal: Nano Letters

The optical band gap of the prototypical semiconducting oxide SnO2 is shown to be continuously controlled through single axis lattice expansion of nanometric films induced by low-energy helium implantation. While traditional epitaxy-induced strain results in Poisson driven multidirectional lattice...

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