A5053000794- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Thermoelectric Materials and Devices
- Chalcogenide Semiconductor Thin Films
- Thermal Expansion and Ionic Conductivity
- Electrocatalysts for Energy Conversion
- Inorganic Chemistry and Materials
- Semiconductor materials and interfaces
- MXene and MAX Phase Materials
- Iron-based superconductors research
- Rare-earth and actinide compounds
- Heusler alloys: electronic and magnetic properties
- Advanced Semiconductor Detectors and Materials
- Electronic and Structural Properties of Oxides
- Intermetallics and Advanced Alloy Properties
- Catalysis and Hydrodesulfurization Studies
- Copper-based nanomaterials and applications
- Machine Learning in Materials Science
- Nanocluster Synthesis and Applications
- Phase-change materials and chalcogenides
- Metalloenzymes and iron-sulfur proteins
- 2D Materials and Applications
- Advanced Battery Materials and Technologies
- Pharmacological Effects and Toxicity Studies
- Ammonia Synthesis and Nitrogen Reduction
Ames National Laboratory
2017-2024
Iowa State University
2017-2024
University of California, Davis
2016-2017
University of California System
2017
An approach to significantly enhance the performance of cost-effective nickel phosphide catalyst for electrochemical water oxidation has been developed via interfacing with Mg oxide-hydroxide. We have synthesized Ni2P nanoparticles anchored on Mg2O(OH)2-like phase supported carbon paper. During oxygen evolution reaction, well-defined serve as precursors immediate formation active and stable nanostructured hydroxide catalyst. As anode reaction in an alkaline electrolyte, electrode shows a...
The effect of the crystal structure ordered transition-metal phosphide catalysts on hydrogen-evolution reaction is investigated using single crystals iron-phosphide (FeP) and monoclinic nickel-diphosphide (<italic>m</italic>-NiP<sub>2</sub>).
In this paper, we explore the drastic differences in transport properties and catalytic activities for two structural polymorphs of NiP2: cubic (Pa3; No. 205) monoclinic NiP2 (C2/c; 15). The former one has been long assumed to be high-pressure metastable phase, as it had originally synthesized through methods. Synthetic situ synchrotron X-ray diffraction studies unambiguously show that polymorph can at ambient pressure but irreversibly transforms into structure above 876 K. Band calculations...
Herein, we describe the synthesis of a toroidal Au
Three novel unconventional clathrates with unprecedented III–V semiconducting frameworks have been synthesized: Cs8In27Sb19, Cs8Ga27Sb19, and Rb8Ga27Sb19. These represent the first examples of tetrel-free that are completely composed main group elements. All title compounds crystallize in an ordered superstructure clathrate-I Ia3̅ space (No. 206; Z = 8). In clathrate framework, a full ordering {Ga or In} Sb is observed by combination high-resolution synchrotron single-crystal powder X-ray...
Specific structural motifs in inorganic solids are often related to their targeted physical properties. For many classes of solids, such as Zintl phases and polar intermetallics, the crystal structures diverse not easy predict. Various antimonides that potential thermoelectric materials were proposed be synthesizable on basis estimated formation energies. Their broadly classified clathrate, channel, layered, or network through a machine learning model trained existing ternary features based...
Two new sodium zinc antimonides NaZn4Sb3 and HT-Na1–xZn4–ySb3 were synthesized by using reactive hydride, NaH, as a precursor. The hydride route provides uniform mixing comprehensive control over the composition, facilitating fast reactions high-purity samples, whereas traditional synthesis metal results in inhomogeneous samples with significant fraction of more stable NaZnSb compound. crystallizes hexagonal P63/mmc space group (No. 194, Z = 2, 4.43579(4) Å, c 23.41553(9) Å) is upon heating...
Bottom-up fabrication of thermoelectric (TE) materials from colloidal nanocrystal (NC) building blocks can substantially increase their TE efficiency, for example, by reducing lattice thermal conductivity. In this work, 10 nm spherical phase-pure oleate-capped PbTe NCs with narrow size distribution were synthesized and employed to fabricate 50 thick films on insulating SiO2/Si substrates. The spin-coating, subsequent ligand exchange procedure, was applied enhance coupling interactions...
A new antimonide K8–xZn18+3xSb16 was synthesized using reactive potassium hydride KH as a precursor. Owing to intimate mixing of starting materials, the route allows rapid phase "screening" ternary systems and is particularly suitable for search antimonides. The crystal structure (x = 1.12(8); P42/nmc (no. 137), 12.3042(5) Å, c 7.3031(3) V 1105.6(1) Å3, R1 0.029) has [Zn18Sb16] framework with large channels alternately filled by K cations Zn3 triangular units. triangles break into finite...
A layered Zintl antimonide NaZnSb (PbClF or Cu2Sb structure type; P4/nmm) was synthesized using the reactive sodium hydride NaH precursor. This method provides comprehensive compositional control and facilitates fast preparation of high-purity samples in large quantities. is highly to humidity/air hydrolyzes NaOH, ZnO, Sb aerobic conditions. On other hand, thermally stable up 873 K vacuum, as no structural changes were observed from high-temperature synchrotron powder X-ray diffraction data...
Single-phase metal dodecaboride solid solutions, Zr0.5Y0.5B12 and Zr0.5U0.5B12, were prepared by arc melting from pure elements. The phase purity composition established powder X-ray diffraction (PXRD), energy-dispersive spectroscopy (EDS), photoelectron (XPS), 10B 11B solid-state nuclear magnetic resonance (NMR) spectroscopy. effects of carbon addition to Zr1–xYxB12 studied it was found that causes fast cooling as a result rapid nucleation grains, well "templating" patterning the surface...
Giant clathrate supercell driven by ordering of Zn/Sb bonding in the framework and Cs-guest vacancies is found unconventional Cs<sub>8</sub>Zn<sub>18</sub>Sb<sub>28</sub>.
During the last few decades, interest over chalcopyrite and related photovoltaics has been growing due outstanding structural electrical properties of thin-film Cu(In,Ga)Se
Three new sodium zinc antimonides Na11Zn2Sb5, Na4Zn9Sb9, and NaZn3Sb3 were synthesized utilizing hydride NaH as a reactive source. In comparison to the synthesis using metal, salt-like can be ball-milled, leading easy uniform mixing of precursors in desired stoichiometric ratios. Such comprehensive compositional control enables fast screening Na–Zn–Sb system identification compounds, followed by their preparation bulk with high purity. Na11Zn2Sb5 crystallizes triclinic P1 space group (No. 2,...
A novel layered compound, NaCu6.3Sb3, has been successfully synthesized from elements. This unique structure crystallizes in the hexagonal space group P63/mmc and lattice constants of a = 4.2166(2) Å c 24.041(1) Å. The consists complex Cu/Sb 2D blocks separated by Na ions. These contain graphene-like layers either Cu or CuSb. solid-state transformations Na-Cu-Sb system between Cu2Sb-NaCu6.3Sb3-NaCu4Sb2 were explored using annealing at different partial vapor pressures Na, differential...
Synthesis, crystal structure, thermal stability, and electronic band structure of four new metal antimonides AM Sb ( A = Rb, Cs; M Zn, Cd) are reported. CsZnSb RbZnSb crystallize in the hexagonal ZrBeSi type, a P 6 3 / mmc space group (no. 194, Z 2) unit cell dimensions 4.5588(2)/4.5466(4) Å c 11.9246(6)/11.0999(10) Å. CsCdSb RbCdSb tetragonal PbFCl type 4/ nmm 129; parameters 4.8884(5)/4.8227(3) 8.8897(9)/8.5492(7) All compounds air‐ water‐sensitive shown through DSC measurements to...
Three new antimonide Zintl phases, RbGaSb2, CsGaSb2, and CsInSb2, were discovered during exploration of corresponding A-M-Sb (A = Rb, Cs; M Ga, In) ternary systems while searching for clathrates. The AGaSb2 phases crystallize in the tetragonal space group P42/nmc (No. 137) LiBS2 structure type, CsInSb2 crystallizes lower symmetry orthorhombic Cmce 64) KGaSb2 type with additional disorder one Cs sites. crystal structures all three reported AMSb2 compounds are composed two-dimensional [MSb2]-...