Engineering the internal surfaces of three-dimensional nanoporous catalysts by surfactant-modified dealloying

Wang, Zhili; Chen, Mingwei; Han, Jonghee; Chen, Cheng; Ning, Shoucong; Hirata, Akihiko; Fujita, Takeshi; Chen, Ming-Wei

doi:10.1038/s41467-017-01085-3

Cited by 82 publications

(97 citation statements)

References 48 publications

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“…2). Meanwhile, the coarsening also leads to the development of multiple low-energy surface facets 35 for cross-sectional TEM observations. Figure 1a shows the high angle annual dark-field (HAADF) STEM image of NPG covered by a thin layer of MoS 2 .…”

Section: Resultsmentioning

confidence: 99%

Van der Waals interfacial reconstruction in monolayer transition-metal dichalcogenides and gold heterojunctions

Luo

Zhang

et al. 2020

Nat Commun

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The structures and properties of van der Waals (vdW) heterojunctions between semiconducting two-dimensional transition-metal dichalcogenides (2D TMDs) and conductive metals, such as gold, significantly influence the performances of 2D-TMD based electronic devices. Chemical vapor deposition is one of the most promising approaches for large-scale synthesis and fabrication of 2D TMD electronics with naturally formed TMD/metal vdW interfaces. However, the structure and chemistry of the vdW interfaces are less known. Here we report the interfacial reconstruction between TMD monolayers and gold substrates. The participation of sulfur leads to the reconstruction of Au {001} surface with the formation of a metastable Au 4 S 4 interfacial phase which is stabilized by the top MoS 2 and WS 2 monolayers. Moreover, the enhanced vdW interaction between the reconstructed Au 4 S 4 interfacial phase and TMD monolayers results in the transition from n-type TMD-Au Schottky contact to ptype one with reduced energy barrier height.

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Section: Resultsmentioning

confidence: 99%

Van der Waals interfacial reconstruction in monolayer transition-metal dichalcogenides and gold heterojunctions

Luo

Zhang

et al. 2020

Nat Commun

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“…To elucidate that point, we thus studied the ability of the materials to catalyze the glycerol electrooxidation reaction, investigating the GDE- and (111) facets of gold. 46,47,50 Due to the reversibility of those adsorption-desorption processes, the reversible desorption of the lead on (111) and (110) corresponds to the peaks at 0.45 and 0.58 V vs. RHE during the backward scan, respectively. As we previously showed, 29,46…”

Section: Resultsmentioning

confidence: 99%

Bromide-Regulated Anisotropic Growth of Desert-Rose-Like Nanostructured Gold onto Carbon Fiber Electrodes as Freestanding Electrocatalysts

Morandi

Tuleushova

Tingry

et al. 2020

ACS Appl. Energy Mater.

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Three-dimensional (3D) gas diffusion electrodes (GDEs) as support for catalytic nanoparticles are important to the electrolysis and fuel cells fields to facilitate reactant transport and distribution, and reach higher current densities. Hence, the assembly of nanostructured catalytic particles directly onto GDEs during the synthesis could be a powerful one-step strategy to target high performance and long-term durability thanks to the induced strong nanoparticlesupport interaction. We report herein the use of bromide anions to shape the anisotropic growth of nanostructured desert-rose-like gold particles directly onto the GDE, as a freestanding GDE-Au catalyst for straightforward use in electrolysis without an additional step. We showed that the bromide ions determine the anisotropy of the particles, resulting in a growth of gold into nanoplates enclosed by (111) facets. The formation of hierarchical nanostructured 3D Au at the GDE surface was explained by the nanoparticle-mediated aggregation mechanism and the preferential adsorption of Br − on the (111) facet leaving behind dominant planar structured nuclei, which then self-assemble. Electrocatalytic tests towards the glycerol electrooxidation demonstrated that the as-synthesized freestanding surfactant-and binder-free GDE-Au material 2 (100 µgAu cm −2) delivered a high specific peak current density of jp = 33 mA cmAu −2 , which is 3 and 7 higher than the tested commercial Au/C nanocatalyst at loadings of 76 and 152 µgAu cm −2 , respectively. This study provides future directions for the synthesis and application of nanostructured catalysts for alcohol oxidation as an alternative to anodic oxygen evolution, which consumes the majority of the electricity input during the electrolysis.

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“…III A, the self-assembled clusters crystallize under these conditions onto a lattice. 4. Cylindrical Spirals (CS) Elongated, cylindrical spirals of colloids are observed at {δ A , δ R } = {0.2, 2.0}.…”

Section: Clusters (C)mentioning

confidence: 99%

Assembly of particle strings via isotropic potentials

Banerjee

Lindquist

Jadrich

et al. 2019

The Journal of Chemical Physics

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Assembly of spherical colloidal particles into extended structures, including linear strings, in the absence of directional interparticle bonding interactions or external perturbation could facilitate the design of new functional materials. Here, we use methods of inverse design to discover isotropic pair potentials that promote the formation of single-stranded, polydisperse strings of colloids "colloidomers" as well as size-specific, compact colloidal clusters. Based on the designed potentials, a simple model pair interaction with a short-range attraction and a longer-range repulsion is proposed which stabilizes a variety of different particle morphologies including (i) dispersed fluid of monomers, (ii) ergodic short particle chains as well as porous networks of percolated strings, (iii) compact clusters, and (iv) thick cylindrical structures including trihelical Bernal spirals. arXiv:1901.04659v1 [cond-mat.soft]

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Engineering the internal surfaces of three-dimensional nanoporous catalysts by surfactant-modified dealloying

Cited by 82 publications

References 48 publications

Van der Waals interfacial reconstruction in monolayer transition-metal dichalcogenides and gold heterojunctions

Van der Waals interfacial reconstruction in monolayer transition-metal dichalcogenides and gold heterojunctions

Bromide-Regulated Anisotropic Growth of Desert-Rose-Like Nanostructured Gold onto Carbon Fiber Electrodes as Freestanding Electrocatalysts

Assembly of particle strings via isotropic potentials

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