Surface chemistry of boron oxidation. 1. Reactions of oxygen and water with boron films grown on tantalum(110)

Wang, Y.; Fan, Jian Chun; Trenary, Michael

doi:10.1021/cm00026a007

Cited by 47 publications

(40 citation statements)

References 2 publications

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“…In addition to the activity,t he stability of ac atalyst is crucial for its technological application.T herefore, the long-term performance of the most active phase (Co 0.7 Fe 0.3 ) 2 B, was investigated using ag alvanostatic scan at ac onstant currentd ensity of 10 mA cm À2 in 1 m KOH solution ( Figure4d). [64][65][66] The observed XPS-features agree well with XPS studies of the binary Co 2 Bc atalysts by Masa et al [11,13] They also showed the transformationf rom an onactive to an activated phase after an electrochemical treatment. We assume that duringt he first two hours all sites in the networklike structure are activated leading to the highest overall catalytic performance.…”

Section: Electrochemical Characterizationsupporting

confidence: 85%

“…The (Co 1Àx Fe x ) 2 Bc atalysts were furtheri nvestigated by XPS. [64,65] In the O1s spectrum we observe ab road peak from 535 down to 529 eV in binding energy (Figure 3d). The 2p photoemission spectrum of Co is depicted in Figure 3a.I ts hows signals at 778.4 (Co 2p 3/2 )a nd 793.5 eV (Co 2p 1/2 )a tt he same position as Co 0 ,a so bserved previously for binary cobaltb orides.…”

Section: Resultsmentioning

confidence: 84%

“…The former can be attributed to the metal-boride, whereas the second is mainlyd ue to B 2 O 3 and other boron-oxo species. [64,65] In the O1s spectrum we observe ab road peak from 535 down to 529 eV in binding energy (Figure 3d). Prominent features are observed at 533.5,5 32.5, and 530.5 eV.T hese can be assigned to boron-a nd cobalt-oxo species.…”

Section: Resultsmentioning

confidence: 84%

“…Herein,t he XPS resultso f( Co 0.7 Fe 0.3 ) 2 Ba re discussed exemplarily for the other systems. [6,[64][65][66] Additional features at 534 and 535 eV bindinge nergy are due to carbon-oxygen compounds and adsorbed water,respectively. [60,61] A small high binding energy shoulder of Co 2p 3/2 ( % 781.3 eV) indicatesp artial oxidation.…”

Section: Resultsmentioning

confidence: 99%

“…Prominent features are observed at 533.5,5 32.5, and 530.5 eV.T hese can be assigned to boron-a nd cobalt-oxo species. [6,[64][65][66] Additional features at 534 and 535 eV bindinge nergy are due to carbon-oxygen compounds and adsorbed water,respectively.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

et al. 2018

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High-performance catalysts for the oxygen-evolution reaction in water electrolysis are usually based on expensive and rare elements. Herein, mixed-metal borides are shown to be competitive with established electrocatalysts like noble metal oxides and other transition-metal(oxide)-based catalysts. Iron incorporation into nanoscale dicobalt boride results in excellent activity and stability in alkaline solutions. (Co Fe ) B shows an overpotential of η=0.33 V (1.56 V vs. RHE) at 10 mA cm in 1 m KOH with a very low onset potential of ≈1.5 V vs. RHE, comparable to the performance of IrO and RuO . XPS shows that the original catalyst is modified under the reaction conditions and indicates that CoOOH and Co(OH) are formed as active surface species, whereas the Fe remains in the catalyst, contributing to an improved catalyst performance. The nanoscale borides are obtained by a one-step solution synthesis, calcined, and characterized by XRD, energy-dispersive X-ray spectroscopy, and SEM. Single crystals of (Co Fe ) B grown under chemical transport conditions were used for an unambiguous specification of the nanostructured particles by relating the cobalt/iron ratio to the lattice parameters.

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Section: Electrochemical Characterizationsupporting

confidence: 85%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

et al. 2018

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Sensing Applications of Atomically Thin Group IV Carbon Siblings Xenes: Progress, Challenges, and Prospects

Khan

Tareen

Wang

et al. 2020

Adv Funct Materials

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The 2D graphene (G) nanosheets (NSs) discovery is amound the foremost revolutionary incidents in materials science history. This discovery has stimulated huge attention in the study of other novel 2D materials (2DMs). This trend might be called modern day "alchemy," where the basic aim is to convert most of periodic table elements into G like 2D structures. Monoelemental, atomically thin 2DMs, called "Xenes" ("X" = group (III-VI)A elements, "ene" suffix that indicates one atom thick 2D layer of atoms) which are a newly invented family among nanomaterials. The number of predicted and experimentally synthesized 2D Xene materials of group IVA, i.e., G's siblings, has gained attention in nanosize devices. Such materials involve buckle structures that have recently been experimentally fabricated. The 2D Xene materials analog to G offer exciting potential for novel sensing applications. The group IVA Xenes, in cooperation with their ligandfunctionalized derivatives, arrange in a honeycomb lattice analogous to G but through a changeable degree of buckling. Their electronic structure ranges from trivial insulators passing via semiconductors with tunable gaps, to semimetallic, depending on substrate, chemical functionalization, and strain. In this review, different potential synthesis methods for group IVA 2D Xenes are briefly presented. A brief overview of their properties obtained theoretically and experimentally is presented, and finally their potential sensing applications are discussed.

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Room‐Temperature Metal‐Catalyzed Ultrafast Gasification of Ultrathin Boron Flakes

Liu

Liao

Wei

et al. 2022

Adv Funct Materials

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The trivalent outer shell of boron renders this element electron‐poor but chemically rich, exhibiting more than one dozen allotropes. Its 2D polymorph has been recently synthesized on metal substrates under ultrahigh vacuum and has attracted intense interest. However, probing its properties ex situ has been challenging due to the quality degradation—surface oxidation—that occurs upon exposure to ambient environments. Herein, this surface chemistry is investigated in regard to the air stability of ultrathin boron flakes on metals prepared by atmospheric‐pressure chemical vapor deposition. The characteristic Volmer–Weber growth is recognized by the stacking of polygon‐shaped, thin flakes as isolated islands. Significantly, the metal‐catalyzed, ultrafast gasification of boron flakes at room temperature, exemplified by the complete, spontaneous vanishment of 200 nm‐thick boron islands in 3 h is observed. A two‐step mechanism, first oxygen‐involved surface oxidation and then subsequent reactions with water forming a highly volatile boric acid layer, is unambiguously revealed by combined surface characterizations. The catalysis by metal substrates, corroborated by theoretical calculations, is attributed as the crucial cause of the unprecedented gasification. The concept of oxygen‐free growth is thereby proposed for air‐sensitive material growth by introducing in situ oxygen scavengers. These findings significantly expand the fundamental understanding of the surface chemistry of boron and pave the way for the chemical vapor deposition growth of hydrophobic materials.

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Surface chemistry of boron oxidation. 1. Reactions of oxygen and water with boron films grown on tantalum(110)

Cited by 47 publications

References 2 publications

Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

Sensing Applications of Atomically Thin Group IV Carbon Siblings Xenes: Progress, Challenges, and Prospects

Room‐Temperature Metal‐Catalyzed Ultrafast Gasification of Ultrathin Boron Flakes

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