The adsorption structure of methylthiolate (CH3S) adsorbed on Au(111), a long-standing controversial issue, has been unambiguously determined by scanned-energy and scanned-angle S 2p photoelectron diffraction. molecules are found to occupy atop sites with S-Au distance 2.42 +/- 0.03 A. angular distribution the photoelectrons due forward scattering reveals that S-C bond is inclined approximately 50 degrees from surface normal towards both [211] [121] (nearest-neighbor thiolate) directions.

Cobalt hydroxide nanoplatelets with a uniform hexagonal shape were prepared in high yield ( approximately 95%) by facile hydrothermal route the presence of poly(vinylpyrrolidone). This method provides simple, low-cost, and large-scale to produce beta-cobalt an average diameter 280 nm thickness ca. 26 which show predominant well-crystalline brucite-like phase. Their thermal decomposition produced anisotropic cobalt oxides (CoO Co3O4) under designed temperatures. The products characterized...

The electronic structure of the formally ${\mathrm{Cu}}^{3+}$ (${\mathit{d}}^{8}$) compound ${\mathrm{NaCuO}}_{2}$ has been studied by photoemission spectroscopy and subsequent cluster configuration-interaction calculations. We find that ${\mathit{d}}^{8}$\ensuremath{\rightarrow}${\mathit{d}}^{9}$L (L: ligand hole) charge-transfer energy is negative ground state dominated ${\mathit{d}}^{9}$L configuration. band gap corresponds to charge fluctuations type...

The CO oxidation reaction on the Pd(111) model catalyst at various temperatures (200–400 °C) under hundreds mTorr pressure conditions has been monitored by in situ ambient X-ray photoelectron spectroscopy and mass spectroscopy. In observation of revealed that surface is covered molecules a lower temperature (200 °C), while higher (300–400 several oxide phases are formed surface. We found reactivity enhanced presence significantly suppressed formation cluster PdO bulk oxide. titration...

The origin of the synergistic catalytic effect between metal catalysts and reducible oxides has been debated for decades. Clarification this effect, namely, strong metal-support interaction (SMSI), requires an understanding geometric electronic structures metal-metal oxide interfaces under operando conditions. We show that inherent lattice mismatch bimetallic materials selectively creates surface segregation subsurface atoms. Interfacial nanostructures are then formed chemical reaction...

The effective elimination of N2O from automobile exhaust at low temperatures poses significant challenges. Compared to other materials, supported RhOx catalysts exhibit high decomposition activities, even in the presence O2, CO2, and H2O. Metal additives can enhance low-temperature activities over catalysts; however, enhancement mechanism active sites require further investigation. In this study, we demonstrate activity a monoclinic ZrO2-supported Rh catalyst [Rh(1)/ZrO2] with Ir addition +...

The adsorption and desorption of n-alkanethiol monolayers on Au(111) have been studied under ultrahigh-vacuum condition by the use scanning tunneling microscopy (STM), thermal spectroscopy (TDS), Auger electron (AES). Molecularly resolved STM observations for alkanethiol revealed that at least four different phases evolve during growth, which results in a multistep growth monolayer. species drastically changes critical coverage, is accompanied structure change from low-density flat-lying...

Uniform Co spherical assemblies were prepared via a facile hydrothermal reduction approach in the presence of surfactants with yield 98%. The assembled nanostructures composed ordered nanoplatelets thickness ∼20 nm, as characterized by scanning electronic microscopy (SEM), transmission (TEM), and high-resolution TEM (HRTEM). This material exhibits ferromagnetic characteristics has high surface area, showing potential applications for catalysts other related nanodevices.

In situ O K-edge X-ray absorption fine structure (XAFS) spectroscopy was applied to investigate the electronic and structural change in nickel–borate (Ni–Bi) electrocatalyst during oxygen evolution reaction (OER). An peak observed around 528.7 eV at 1.0 V versus Ag/AgCl a potassium borate aqueous solution, which relates with formation of nanoscale order domains edge-sharing NiO6 octahedra Ni–Bi electrocatalyst. XAFS spectra were measured variation electrode potential from 0.3 up V. The peaks...

La-loaded Al2O3 (La/Al2O3) is a practical support for three-way catalysis (TWC) reactions. Although it has been reported that the addition of La to results in improved thermal stability retain high specific surface areas, its effect on catalytic reduction NOx (DeNOx) not studied systematically. Herein, we describe role La/Al2O3-supported Pd catalysts (Pd/La/Al2O3) TWC For purpose, employed various situ spectroscopic studies, including infrared (IR), X-ray absorption fine structure (XAFS),...

To study the influence of crystal orientation on electrochemical properties boron-doped diamond (BDD), electrodes comprising (100) and (111) homoepitaxial single-crystal layers BDD were investigated these compared with a thin polycrystalline electrode. The samples similar amounts boron around 1020 cm–3 resistivity 6 × 10–3 Ω cm prepared. Evaluation reactivity each both H- O-terminated surfaces showed that was most reactive, whereas proved to be more reactive than ones for BDD. Moreover,...

Catalytic decomposition of N2O into N2 and O2 is one the most important techniques for removing from atmosphere to curb global warming. Supported RhOx catalysts are known show high efficiency decomposition, even in presence O2, compared with other materials, such as supported metal oxides Fe-based zeolite catalysts. In this study, addition Ag was found enhance an Al2O3-supported catalyst (RhOx/Al2O3) decomposition. The promotional effect investigated using various operando spectroscopic...

Catalytic CO oxidation reaction on a Pd(100) single-crystal surface under several hundred mTorr pressure conditions has been studied by ambient X-ray photoelectron spectroscopy and mass spectroscopy. In-situ observation of the reveals that two pathways switch over alternatively depending temperature. At lower temperatures, is covered molecules CO2 formation rate low, indicating poisoning. higher temperatures above 190 °C, an O-Pd-O trilayer oxide phase formed drastically increases. It likely...

Characterization of Mo species on Rh metal particles in Rh–MoOx/C catalyst for C–O hydrogenolysis reactions was carried out with situ ambient-pressure X-ray photoelectron spectroscopy (AP-XPS) and density functional theory (DFT) calculations. The as-prepared sample high oxidation states Rh3+, Rh4+ Mo6+ reduced 0.2 Torr H2. All the most were to Rh0 Mo4+ during heating 570 K. thickness layers after reduction calculated by a numerical analysis based XPS intensity ratio uniform adlayer stacking...

Low temperature and high pressure are thermodynamically more favorable conditions to achieve conversion methanol selectivity in CO2 hydrogenation. However, low-temperature activity is generally very poor due the sluggish kinetics, thus, designing highly selective catalysts active below 200 °C a great challenge CO2-to-methanol conversion. Recently, Re/TiO2 has been reported as promising catalyst. We show that indeed continuous high-pressure (56 331 bar) operations at 125–200 compared an...

<title>Abstract</title> Selective catalytic reduction of NO_x with hydrogen (H₂-SCR) in the presence oxygen is an environmentally friendly and sustainable emission control technology that has attracted considerable attention. However, even most promising currently available catalysts are not sufficiently active to effectively promote this reaction, particularly at low temperatures (&lt; 150°C). Therefore, there urgent need for development highly H₂-SCR...

Monodisperse FePd nanoparticles were prepared by polyol reduction of palladium acetylacetonate and thermal decomposition iron pentacarbonyl, using a combination n-adamantanecarboxylic acid tri-alkylphosphine as stabilizers. The mean particle size can be tuned from 11 to 16 nm controlling the concentration type stabilizers reaction conditions. High monodispersity leads formation two-dimensional (2D) superlattices consisting hexagonal close-packed particles, which was confirmed X-ray...

PURPOSE: To clarify the computed tomographic (CT) features of focal organizing pneumonia. MATERIALS AND METHODS: The authors retrospectively studied CT scans 18 patients with histologically proved Chest radiographs in all suggested bronchogenic carcinoma. RESULTS: Seventeen lesions (94%) had an irregular margin, 10 (56%) satellite lesions, nine (50%) a pleural tag, and air bronchogram. pneumonia could be classified into three types: Type A (n = 5) was small round mass (pleural n 4). B 7)...

We have developed a soft x-ray time-resolved photoemission spectroscopy system using synchrotron radiation (SR) at SPring-8 BL07LSU and an ultrashort pulse laser system. Two-dimensional angle-resolved measurements were performed with time-of-flight-type analyzer. The is synchronized to light pulses of SR time control unit. performance the instrument demonstrated by mapping band structure Si(111) crystal over surface Brillouin zones observing relaxation photo-voltage effect pump (laser) probe method.