Crystalline boron monosulfide nanosheets with tunable bandgaps

Kusaka, Haruki; Ishibiki, Ryota; Toyoda, Masayuki; Fujita, Takeshi; Tokunaga, Tomoharu; Yamamoto, Akiyasu; Miyakawa, Masashi; Matsushita, Kyosuke; Miyazaki, Keisuke; Li, Linghui; Shinde, Satish Laxman; Lima, Mariana S. L.; Sakurai, Takayasu; Nishibori, Eiji; Masuda, Toshio; Horiba, Koji; Watanabe, Kenji; Saito, Susumu; Miyauchi, Mutsumi; Taniguchi, Takashi; Hosono, Hideo; Kondo, Takahiro

doi:10.1039/d1ta03307g

Cited by 25 publications

(29 citation statements)

References 51 publications

(54 reference statements)

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“…The charge states of boron were judged based on the B 1s core level peak position by comparing the results with those in the literature (listed in the Supplementary Information of Ref. [ 46 ]).…”

Section: Methodsmentioning

confidence: 99%

Highly Dispersed Ni Nanoclusters Spontaneously Formed on Hydrogen Boride Sheets

et al. 2022

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Hydrogen boride (HB) sheets are two-dimensional materials comprising a negatively charged hexagonal boron network and positively charged hydrogen atoms with a stoichiometric ratio of 1:1. Herein, we report the spontaneous formation of highly dispersed Ni nanoclusters on HB sheets. The spontaneous reduction reaction of Ni ions by the HB sheets was monitored by in-situ measurements with an ultraviolet-visible spectrometer. Acetonitrile solutions of Ni complexes and acetonitrile dispersions of the HB sheets were mixed in several molar ratios (the HB:Ni molar ratio was varied from 100:0.5 to 100:20), and the changes in the absorbance were measured over time. In all cases, the results suggest that Ni metal clusters grow on the HB sheets, considering the increase in absorbance with time. The absorbance peak position shifts to the higher wavelength as the Ni ion concentration increases. Transmission electron microscopy images of the post-reaction products indicate the formation of Ni nanoclusters, with sizes of a few nanometers, on the HB sheets, regardless of the preparation conditions. These highly dispersed Ni nanoclusters supported on HB sheets will be used for catalytic and plasmonic applications and as hydrogen storage materials.

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Section: Methodsmentioning

confidence: 99%

Highly Dispersed Ni Nanoclusters Spontaneously Formed on Hydrogen Boride Sheets

et al. 2022

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“…To investigate the influence of hydrogen insertion on the photoelectric behavior, excitation−emission matrix (EEM) spectra of WO 3 and H 0.125 WO 3 were also obtained (Figure 1g,h) with a similar emission peak (440−480 nm) corresponding to the emission band of WO 3 . 45,47 In general, the gradual decrease in the EEM fluorescence was accompanied by an increase of electrons participating in the catalytic reaction. 45 The EEM intensity (the color was used to distinguish the intensity) of H 0.125 WO 3 was significantly lower than that of WO 3 , indicating that greater amounts of electrons in H 0.125 WO 3 participated in the catalytic reaction rather than recombined to produce fluorescence.…”

Section: Resultsmentioning

confidence: 99%

Liquid-Metal-Induced Hydrogen Insertion in Photoelectrodes for Enhanced Photoelectrochemical Water Oxidation

et al. 2022

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Fast charge separation and transfer (CST) is essential for achieving efficient solar conversion processes. This CST process requires not only a strong driving force but also a sufficient charge carrier concentration, which is not easily achievable with traditional methods. Herein, we report a rapid hydrogenation method enabled by gallium-based liquid metals (GBLMs) to modify the prototypical WO3 photoelectrode to enhance the CST for a PEC process. Protons in solution are controllably embedded into the WO3 photoanode accompanied by electron injection due to the strong reduction capability of GBLMs. This process dramatically increases the carrier concentration of the WO3 photoanode, leading to improved charge separation and transfer. The hydrogenated WO3 photoanode exhibits over a 229% improvement in photocurrent density with long-term stability. The effectiveness of GBLMs treatment in accelerating the CST process is further proved using other more general semiconductor photoelectrodes, including Nb2O5 and TiO2.

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“…Therefore, the catalytic activities of subnanometric catalysts cannot be estimated from the bulk database. Recently, new boronbased two-dimensional materials have been intensively studied [177][178][179][180][181][182][183][184]. These materials may be new options to control support effects.…”

Section: Discussionmentioning

confidence: 99%

Chemical modification of graphene for atomic-scale catalyst supports

Kunisada

Sakaguchi

2022

Nano Ex.

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One promising way to reduce the use of noble metal catalysts is to use extremely fine particle catalysts, such as subnanoclusters and single-atom catalysts. For practical use, suppression of diffusion and agglomeration of catalysts are needed. Heteroatom-doped graphene, which has high specific surface area, high chemical and mechanical stabilities, high electrical and thermal conductivities, and contains anchoring sites for catalysts, is promising catalyst support. Heteroatom-doped graphene can widely control the support effects. This review summarizes recent dopant structure characterization using spectroscopy and density functional theory calculations. The distribution of highly-dispersed metal catalysts and their diffusion properties are discussed. In addition, The effects of environmental conditions on catalyst dynamic behaviors are introduced. Finally, the outlook of heteroatom-doped graphene and new two-dimensional material supports is discussed.

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Crystalline boron monosulfide nanosheets with tunable bandgaps

Abstract: Two-dimensional (2D) boron monosulfide (BS) nanosheets are predicted to have several stable phases and unique electronic structures, endowing them with interesting attributes, including superconducting, thermoelectric, and hydrogen storage properties. In...

Cited by 25 publications

References 51 publications

Highly Dispersed Ni Nanoclusters Spontaneously Formed on Hydrogen Boride Sheets

Highly Dispersed Ni Nanoclusters Spontaneously Formed on Hydrogen Boride Sheets

Liquid-Metal-Induced Hydrogen Insertion in Photoelectrodes for Enhanced Photoelectrochemical Water Oxidation

Chemical modification of graphene for atomic-scale catalyst supports

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