Metal hydrides with a high hydrogen content are important for materials-based hydrogen storage and high-temperature superconductivity. Nanoconfinement of metal hydrides in porous hosts is a promising strategy to tune the thermodynamic stability and control the hydrogen-to-metal ratio. X-ray absorption and photoelectron spectroscopy provided detailed information about the local chemical environment of LaHx species within carbon hosts. Read more »
Journal Covers
Local Chemical Enhancement and Gating of Organic Coordinated Ionic-Electronic Transport
Record ion mobility and conductivities are revealed within a nanoscopic interfacial superhighway of an organic mixed ionic-electronic conductor. Fast ion transport can be controlled by hydrophobicity of molecules local to this channel, effectively gating ion access to the superhighway. This mechanism is used in a novel chemical sensing device which detects the dynamics of a local, buried chemical reaction. Read more »
Advancing high-temperature electrostatic energy storage via linker engineering of metal–organic frameworks in polymer nanocomposites
High-performance, thermally resilient polymer dielectrics are essential for film capacitors used in advanced electronic devices and renewable energy systems, particularly at elevated temperatures where conventional polymers fail to perform. Herein, we unravel the untapped potential of UiO-66 metal–organic framework (MOF) derivatives as exceptional nanofillers for tuning the properties of the widely used polyetherimide (PEI). Read more »
Jamming Giant Molecules at Interface in Organic Photovoltaics to Improve Performance and Stability
Giant molecule acceptors (GMAs), known for their large size and intricate functional structures, are an emerging focus in materials science. Through implementation of an interface-enhanced layer-by-layer fabrication strategy, we have successfully demonstrated that GMA with designed electronic structure at interfaces can effectively improve OPV device performance. Read more »
Elucidating Heterogeneous Li Insertion Using Single-Crystalline and Freestanding Layered Oxide Thin Film
The nanoscale surface insertion of lithium in a single-crystalline and freestanding LiNi1/3Mn1/3Co1/3O2 thin film is elucidated using in situ scanning transmission x-ray microscopy. The realization of advanced analysis through freestanding thin films is expected to be applicable to other systems subjected to external stimuli, such as hydrogen storage alloys, in the field of materials science. Read more »
Electronic energy transfer ionization in naphthalene–CO2 clusters reveals excited states of dry ice
The interaction between CO2 and polycyclic aromatic hydrocarbons is of interest in astrochemically relevant ices, the transition to renewable energy, and the development of green chemistry. We investigate the VUV excitation of the naphthalene–CO2 complex and observe excited states of CO2 through a newly identified electronic energy transfer ionization mechanism. Read more »
4f-Orbital Mixing Increases the Magnetic Susceptibility of Cp’3Eu
The ability to harness the 4f-orbital anisotropies and magnetic susceptibilities of lanthanide elements is key to their application in molecular magnetism, including as molecular qubits and single-molecule magnets. Here, 4f orbital mixing and its impact on the magnetic susceptibility of a trivalent Eu organometallic complex was analyzed experimentally. Read more »
Tuning the Spin Transition and Carrier Type in Rare-Earth Cobaltates via Compositional Complexity
This work demonstrates that tunable disorder in a crystal can be quite useful: compositional site disorder was used to modify oxide semiconductors by changing the carrier type, improving crystallinity and tuning a spin transition. Applications include electrothermal thresholding devices such as radio frequency limiters. Read more »
Unveiling Direct Electrochemical Oxidation of Methane at the Ceria/Gas Interface
Ceria-based oxides embedded in solid-oxide fuel cells are recognized for their critical role in managing hydrocarbon activation and carbon coking. However, even for the simplest hydrocarbon molecule, CH4, the mechanism of electrochemical oxidation at the ceria/gas interface is not well understood. This study presents a Sm-doped ceria thin-film model cell that selectively monitors CH4 direct-electro-oxidation on the ceria surface. Read more »
Electron microscopy observations of the diversity of Ryugu organic matter and its relationship to minerals at the micro- to nano-scale
The work reported here addresses the question of how the organic matter (OM) in the Hayabusa2 samples compares and contrasts with OM from primitive carbonaceous chondrites, as observed primarily by transmission electron microscopy in concert with other microanalytical techniques. Read more »
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