A5001727106- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Copper-based nanomaterials and applications
- Crystal Structures and Properties
- Gas Sensing Nanomaterials and Sensors
- ZnO doping and properties
- Iron-based superconductors research
- Transition Metal Oxide Nanomaterials
- Ga2O3 and related materials
- Advanced Condensed Matter Physics
- Inorganic Fluorides and Related Compounds
- Chalcogenide Semiconductor Thin Films
- Corrosion Behavior and Inhibition
- Diamond and Carbon-based Materials Research
- Magnetic and transport properties of perovskites and related materials
- Integrated Circuits and Semiconductor Failure Analysis
- Electron and X-Ray Spectroscopy Techniques
- Iron oxide chemistry and applications
- Ion-surface interactions and analysis
- Catalysis and Oxidation Reactions
- Laser-Ablation Synthesis of Nanoparticles
- Electronic and Structural Properties of Oxides
- X-ray Spectroscopy and Fluorescence Analysis
- Photocathodes and Microchannel Plates
- Crystallization and Solubility Studies
Stanford University
2023-2025
Interface (United States)
2023-2025
California Institute of Technology
2024
nLIGHT (United States)
2024
SLAC National Accelerator Laboratory
2024
Digital Research Alliance of Canada
2023
The University of Texas at Arlington
2016-2021
Abstract CuFeO 2 is recognized as a potential photocathode for photo(electro)chemical water splitting. However, photocurrents with ‐based systems are rather low so far. In order to optimize charge carrier separation and reduction kinetics, defined /Pt, /Ag, /NiO x (OH) y heterostructures made in this work through photodeposition procedure based on 2H hexagonal nanoplatelet shaped powder. splitting performance tests closed batch photoreactor show that these heterostructured powders exhibit...
Solution combustion synthesis (SCS) is shown to be versatile for the rapid-one-pot of three compounds and four polymorphs in Cu–V–O ternary family: α-CuV2O6, α- β-Cu2V2O7, γ-Cu3V2O8. These feature copper/vanadium stoichiometric ratios ranging from 1:1 3:1; their structural, electronic, optoelectronic, photoelectrochemical attributes were comprehensively characterized by a combination theoretical experimental techniques. The main contribution present study demonstration that range...
This study explores the manifold consequences of introducing copper into an alkaline earth metal (A = Mg, Ca, or Sr) pyrovanadate compound (A2V2O7) framework. Thus, powder X-ray diffraction coupled with Rietveld refinement showed that phase pure alloys, namely, Mg0.67Cu1.33V2O7, CaCuV2O7, and SrCuV2O7 could be obtained via solution combustion synthesis. Local structure distortions from insertion A2V2O7 framework were revealed by Raman spectroscopy photoelectron spectroscopy. Importantly,...
This study addresses a perennial problem in the synthesis of copper vanadates, namely, that phase purity. A time-efficient solution combustion (SCS) was employed for obtaining α-CuV2O6 polycrystalline powder form matter minutes. Admixture final product with α-Cu2V2O7 or V2O5 avoided by combination careful pH control SCS precursor mixture and postsynthesis NaOH wash. The purity resultant demonstrated Rietveld refinement X-ray diffraction data, energy-dispersive analyses, laser Raman...
Abstract The polaronic effects at the atomic level hold paramount significance for advancing efficacy of transition metal oxides in applications pertinent to renewable energy. lattice–distortion mediated localization photoexcited carriers form polarons plays a pivotal role photocatalysis. This investigation focuses on rutile TiO 2 , an important material extensively explored solar energy conversion artificial photosynthesis, specifically targeting generation green H through...
Photocatalytic CO2 reduction to CO under unassisted (unbiased) conditions was recently demonstrated using heterostructure catalysts that combine p-type GaN with plasmonic Au nanoparticles and Cu as cocatalysts (p-GaN/Al2O3/Au/Cu). Here, we investigate the mechanistic role of in p-GaN/Al2O3/Au/Cu photocatalytic operating K-edge X-ray absorption spectroscopy first-principles calculations. Upon exposure gas-phase H2O vapor reaction conditions, composition is identified a mixture CuI CuII oxide,...
Abstract We have applied density functional theory to study the electronic structure changes caused by Nb incorporation in BiVO 4 and application of external pressure. The overall solubility is usually high, presence oxygen vacancies affect dopability . Through analyses chemical‐potential landscape, we determined single‐phase stability zone with doping. most favorable doping simultaneous substitutions at both V‐ Bi‐sites. Even though substitution only V‐site next favorable, band gap change...
Abstract Two polymorphs of AgVO 3 , namely the α‐ and β‐ forms, were prepared their physical, structural, optical, electrochemical, photoelectrochemical characteristics compared using a battery experimental theoretical tools. A two‐step method, previously developed in our laboratory for electrodeposition inorganic semiconductor films, was applied to electrosynthesis silver vanadate (AgVO ) films on transparent, conducting oxide surfaces. In first step, cathodically deposited from non‐aqueous...
Copper vanadates have been important to the development of new-generation photoelectrodes for solar water splitting and hydrogen generation. Of these, copper pyrovanadate (β-Cu2V2O7), 2:1 ternary compound derived from CuO V2O5, has particular interest fuel community. This n-type semiconductor shown highest photocurrent oxidation at 1.23 V versus reversible electrode exhibits good photostability in aqueous media pH 9.2. However, further successful application this material...
Abstract The front cover artwork is provided by Dr. Hori Pada Sarker from Frank Abild‐Pedersen's research group at the SLAC National Accelerator Laboratory. image shows generation of photoexcited carriers (electrons and holes) subsequent formation hole polaron in rutile TiO 2 during oxygen evolution reaction (OER). Read full text Research Article 10.1002/cphc.202400060 .
Understanding individual ions in solutions is essential for advancing our knowledge of complex chemical systems. However, tracking and detecting at the single-ion level liquid environments remains a challenge. We introduce strategy visualization differentiation different environment via point defects hexagonal boron nitride (h-BN) as ion sensor. Ions interacting with optically active h-BN alter emission properties, allowing us to capture these changes visualize single ions. Using Li+ organic...
Cathodic corrosion of copper (Cu) has posed a significant challenge for over century, impeding various technological progresses such as electrochemical conversion CO2 (eCO2RR) into fuels and other value-added carbon products. In this study, employing combined Density Functional Theory (DFT) kinetic Monte Carlo (kMC) simulation approach, we delve the atomistic level mechanism driving phenomenon in Cu. Our hypothesis posits pivotal role alkaline hydrogen evolution reaction (HER) facilitating...
The electrochemical CO 2 reduction reaction (eCO RR) is one of the promising pathways which primarily leverages electrocatalysts such as copper (Cu) to facilitate conversion into higher value carbon products; C1 (e.g., CO, methane, formic acid, and methanol etc.) C2 ethylene, ethane, ethanol using renewable electricity. Cu only monometallic electrocatalyst able electrochemically transform hydrocarbons with appreciable activity selectivity. However, oxide-derived surfaces (OD-Cu) fall short...
The polaronic effects at the atomic level hold paramount significance for advancing efficacy of transition metal oxides in applications pertinent to renewable energy. lattice-distortion localization photoexcited carriers form polarons plays a pivotal role photocatalysis. This investigation focuses on rutile TiO2, an important material extensively explored solar energy conversion artificial photosynthesis, specifically targeting generation green H2 through photoelectrochemical (PEC) H2O...
This study focuses on a solid solution series, Ca(La1- xCe x)2S4 (0 ≤ x 1), where the f electron density is absent in CaLa2S4 and progressively increased until it maximized CaCe2S4. Correspondingly, these samples, synthesized by sealed ampule method, showed progressive variations color ranging from gray for to orange-red The crystal structural nuances of both end members three solutions with = 0.25, 0.50, 0.75 were established complementary use synchrotron X-ray diffraction neutron...
For efficient usage of the rare earth-based materials in electronic or optoelectronic applications, their 4f electrons' behaviors must be understood properly. We have presented Hubbard U corrected density functional theory (DFT+U) study structural, magnetic, electronic, and optical properties a rare-earth chalcogenide system, Ca(La1−xCex)2S4 (0 ≤ x 1). A unique site selection technique based on local magnetic moment arrangements was applied to build atomic for Ce doped solid solution. The...
Optical manipulation has enabled study of bio-chemical and bio-mechanical properties the cells. Laser nanosurgery by ultrafast laser beam with appropriate parameters provides spatially-targeted neurons in a minimal invasiveness manner high efficiency. We utilized femto-second nano-surgery for both axotomy sub-axotomy rat cortical neurons. Degeneration regeneration after was studied without external growth-factor(s) biochemical(s). Further, axonal injury as function pulse energy, exposure...
Both SbTaO 4 and SbNbO in the orthorhombic α-Sb 2 O phase have demonstrated pure water splitting as photo-catalysts. Previous experimental studies shown a significant difference reported bandgap values for such 3.71 eV 2.28 eV. We studied SbTa 1-x Nb x (x = 0, 0.25, 0.5, 0.75, 1) tetragonal, orthorhombic, monoclinic phases. The resulting Sb 3+ M 5+ -2 material can be classified n s m d 0 ternary metal oxide. effects of structural symmetry related distortions on band gaps overall energetics...
Harnessing the power of solar energy plays an essential role in developing renewable technologies to supplement or perhaps replace fossil fuel utilization. The green technology has potential address challenges growing demand and climate changes around world. Production H 2 from water splitting via photo-electrochemical process is one technologies. BiVO 4 best photoanode material for oxidation as well photo-catalyst evolution splitting. Despite being efficient photo absorber material, it poor...