Boron nanostructure formation on Mo(112) surface

Hossain, Shahadat; Peng, Guansong; Nakagawa, Takeshi

doi:10.1016/j.susc.2022.122145

Cited by 5 publications

(3 citation statements)

References 37 publications

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“…The fact that such a shift is not seen in the Auger spectra is presumably due the opposite compensation of chemical and final state effects in the case of an atom with two electron vacancies created in the Auger process. Quite strong interaction in the B-Mo system was also recently demonstrated by dynamical LEED and DFT calculations by Hossain et al [ 21 ] for a boron layer annealed on Mo(112) surface. Furthermore, very similar behavior of boron films in terms of diffusion into the Si(111) substrate bulk accompanied by chemical bond formation is reported by Krugener et al [ 22 ], using ultraviolet photoelectron spectroscopy and reflection high-energy electron diffraction.…”

Section: Resultssupporting

confidence: 52%

Enhancing the Catalytic Activity of Mo(110) Surface via Its Alloying with Submonolayer to Multilayer Boron Films and Oxidation of the Alloy: A Case of (CO + O2) to CO2 Conversion

Men

Магкоев

Behjatmanesh–Ardakani

et al. 2023

Nanomaterials

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In-situ formation of boron thin films on the Mo(110) surface, as well as the formation of the molybdenum boride and its oxide and the trends of carbon monoxide catalytic oxidation on the substrates formed, have been studied in an ultra-high vacuum (UHV) by a set of surface-sensitive characterization techniques: Auger and X-ray photoelectron spectroscopy (AES, XPS), low-energy ion scattering (LEIS), reflection-absorption infrared spectroscopy (RAIRS), temperature-programmed desorption (TPD), electron energy loss spectroscopy (EELS) and work function measurements using the Anderson method. The boron deposited at Mo(110) via electron-beam deposition at a substrate temperature of 300 K grows as a 2D layer, at least in submonolayer coverage. Such a film is bound to the Mo(110) via polarized chemisorption bonds, dramatically changing the charge density at the substrate surface manifested by the Mo(110) surface plasmon damping. Upon annealing of the B-Mo(110) system, the boron diffuses into the Mo(110) bulk following a two-mode regime: (1) quite easy dissolution, starting at a temperature of about 450 K with an activation energy of 0.4 eV; and (2) formation of molybdenum boride at a temperature higher than 700 K with M-B interatomic bonding energy of 3.8 eV. The feature of the formed molybdenum boride is that there is quite notable carbon monoxide oxidation activity on its surface. A further dramatic increase of such an activity is achieved when the molybdenum boride is oxidized. The latter is attributed to more activated states of molecular orbitals of coadsorbed carbon monoxide and oxygen due to their enhanced interaction with both boron and oxygen species for MoxByOz ternary compound, compared to only boron for the Mox’By’ double alloy.

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Section: Resultssupporting

confidence: 52%

Enhancing the Catalytic Activity of Mo(110) Surface via Its Alloying with Submonolayer to Multilayer Boron Films and Oxidation of the Alloy: A Case of (CO + O2) to CO2 Conversion

Men

Магкоев

Behjatmanesh–Ardakani

et al. 2023

Nanomaterials

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“…The high-resolution TEM (HR-TEM) illustrates the lattice spacing of 0.213 nm corresponding to the (1 1 2) of MoB. [48,49] CO diffuse-reflectance infrared Fourier transform spectroscopy (CO DRIFTS) was performed to investigate the geometrical information of Ru species. [50] Relative to MoB (Figure S5, Supporting Information), three characteristic peaks are detected due to the adsorption of CO on Ru sites (Figure 1e).…”

Section: Physical Characterizationmentioning

confidence: 99%

Microwave Quasi‐Solid State to Construct Strong Metal‐Support Interactions with Interfacial Electron‐Enriched Ru for Anion Exchange Membrane Electrolysis

Yang,

Liu,

Zang

et al. 2023

Advanced Energy Materials

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Regulating the metal‐support interaction of the anchored metal nanoclusters is recognized as valid approach to optimize the electrocatalytic performance through tuning the interfacial electronic structure. However, developing novel support and understanding the interfacial electron accumulation on modulating the reaction kinetics are still elusive. Herein, highly‐dispersed Ruthenium (Ru) nanoclusters anchored onto phosphorous doped molybdenum boride (Ru/P‐MoB) is developed through ultrafast microwave‐plasma (60 s) approach. The synthesized Ru/P‐MoB impressively promote the hydrogen evolution with low overpotentials of 34, 45, and 40 mV to drive 10 mA cm−2 in alkaline freshwater, alkaline seawater and acid media. Specially, it presents superior turnover frequency and mass/specific activity relative to Pt/C, Ru/C, and Ru/MoB. Moreover, the anion exchange membrane (AEM) electrolyzer cell based on Ru/P‐MoB can achieve 500 and 1000 mA cm−2 with small voltages of 1.71 and 1.78 V with good durability. Experimental and density functional theoretical (DFT) analysis reveal that the strong metal‐support interactions (Ru─Mo and Ru─P bonds) with generated interfacial electron‐enriched Ru, and then favoring the water‐molecule adsorption/dissociation and optimal H intermediate adsorption free energy. This work provides novel designing avenue to exploit electrocatalysts with outstanding catalytic performance under high current density at practical high‐temperature.

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“…Due to the multi-center bonding of boron atoms, abundance of polymorphs has been reported experimentally. Configuration of boron atoms on substrate can be a monolayer (borophene) [9][10][11][12][13][14][15][16][17][18], a two-dimension (2D) boride [19], an embedded one-dimension (1D) wire [20][21][22][23][24] or a zero-dimension (0D) cluster [25,26]. These surface boron materials have accordingly shown varieties of electronic states and some of them are expected to lead to discovery of the intriguing phenomena, such as superconductivity [27][28][29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Structure and Electronic State of Boron Atomic Chains on a Noble Metal (111) Surface

Tsujikawa,

Zhang,

Horio

et al. 2023

e-J. Surf. Sci. Nanotechnol.

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A two-dimensional crystal of the copper boride was grown on the well-known Cu(111) surface by boron deposition. The atomic structure and the electronic state were analyzed by a concerting usage of positron diffraction and photoemission spectroscopy. The surface layer is composed of the B and Cu atomic chains that are alternately arranged. It has been known that the B and Cu phases are completely separated in three-dimensional (3D) materials. The present study intriguingly revealed that a compound is formed in two-dimension (2D) at the surface. In addition, the Cu(111) substrate was found to affect a relative height between the B and Cu chains. The 2D Cu-B compound on Cu(111) likely becomes an ideal B/Cu interface to develop surface science and boron chemistry.

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Boron nanostructure formation on Mo(112) surface

Cited by 5 publications

References 37 publications

Enhancing the Catalytic Activity of Mo(110) Surface via Its Alloying with Submonolayer to Multilayer Boron Films and Oxidation of the Alloy: A Case of (CO + O2) to CO2 Conversion

Enhancing the Catalytic Activity of Mo(110) Surface via Its Alloying with Submonolayer to Multilayer Boron Films and Oxidation of the Alloy: A Case of (CO + O2) to CO2 Conversion

Microwave Quasi‐Solid State to Construct Strong Metal‐Support Interactions with Interfacial Electron‐Enriched Ru for Anion Exchange Membrane Electrolysis

Structure and Electronic State of Boron Atomic Chains on a Noble Metal (111) Surface

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