Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

Kim, Jung‐Ah; Hong, Soonchang; Jang, Hee‐Jeong; Choi, Younghoon; Park, Sungho

doi:10.1016/j.jcis.2012.09.007

Cited by 12 publications

(9 citation statements)

References 34 publications

(43 reference statements)

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“…Synthesis of Au and Au@Ag hexagonal nanoplates was accomplished according to the modified method . Au nanoprisms, synthesized by the previously described method, provided seeds to grow Au hexagonal nanoplates.…”

Section: Methodsmentioning

confidence: 99%

“…Synthesis of Au and Au@Ag hexagonal nanoplates was accomplished according to the modified method. 44 Au nanoprisms, synthesized by the previously described method, provided seeds to grow Au hexagonal nanoplates. AA (22.5 mL, 4.73 mM) was added with stirring to a mixture containing 65 mL of 0.05 mM CTAB, 37.5 μL of 0.1 M NaI, 2 mL of 30 mM HAuCl 4 •3H 2 O, and 10 mL of the Au nanoprism suspension at a rate of 0.5 mL/min by means of a mechanical syringe pump (KD Scientific 200).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

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Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO₂ Reduction

et al. 2017

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Environmental impacts of continued CO2 production have led to an increased need for new methods of CO2 removal and energy development. Nanomaterials are of special interest for these applications, because of their unique chemical and physical properties that allow for highly active surfaces. Here, we successfully synthesize AgPd nanodendrite-modified Au nanoprisms in various shapes (nanoprisms, hexagonal nanoplates, and octahedral nanoparticles) by selective metal deposition. This strategy involves coupling galvanic replacement between Ag layers in Au@Ag core–shell nanoprisms and H2PdCl4 with a coreduction process of silver and palladium ions. Synthesis of AgPd nanodendrite-tipped (4.14–11.47 wt % Pd) and -edged (25.25–31.01 wt % Pd) Au nanoparticles can be controlled simply by tuning the concentration of H2PdCl4. More importantly, these multicomponent AgPd nanodendrite-modified Au nanoparticles show exceptional electrocatalytic performance for CO2 reduction. AgPd nanodendrite-edged Au nanoprisms show more favorable potentials (−0.18 V vs RHE) than previously reported nanocatalysts for the reduction of CO2 to formate, and exhibit higher faradaic efficiencies (49%) than Au, Au@Ag, and AgPd nanodendrite-tipped Au nanoprisms in aqueous electrolytes. Moreover, AgPd nanodendrite-modified Au nanoprisms show much higher selectivity and faradaic efficiency for CO2 reduction to CO (85–87%) than Au and Au@Ag nanoprisms (43–64%) in organic electrolytes. The high performance of these particles for CO2 reduction is attributed to the unique structure of AgPd nanodendrite-modified Au nanoprisms and the synergistic effect of Ag having an affinity for CO2, efficient binding of hydrogen at Pd, and Au as a stable, conductive support. In addition, AgPd nanodendrite-edged Au nanoprisms show highly stable catalytic activity during long-term electrolyses (up to 12 h) and repetitive use. These exciting results indicate that AgPd nanodendrite-modified Au nanoparticles are promising for application in CO2 conversion into useful fuels.

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Section: Methodsmentioning

confidence: 99%

Section: ■ Experimental Sectionmentioning

confidence: 99%

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO₂ Reduction

et al. 2017

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“…Metal nanoparticles have received much attention due to their versatile use in catalysis, optoelectronics, magnetics, biotechnology, and microelectronics applications . Because the nanoparticle size is known to be an important factor to enhance the activity or functionality for practical applications, various synthetic methods have been introduced, and a potential growth mechanism has been proposed to explain the relationship between the crystal structure and the optical, physical, and electrical functionalities .…”

Section: Introductionmentioning

confidence: 99%

2D Single‐Crystalline Copper Nanoplates as a Conductive Filler for Electronic Ink Applications

Lee

Han

Lee

et al. 2017

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Large-scale 2D single-crystalline copper nanoplates (Cu NPLs) are synthesized by a simple hydrothermal method. The combination of a mild reductant, stabilizer, and shape modifier allows the dimensional control of the Cu nanocrystals from 1D nanowires (NWs) to 2D nanoplates. High-resolution transmission electron microscopy (HR-TEM) reveals that the prepared Cu NPLs have a single-crystalline structure. From the X-ray photoelectron spectroscopy (XPS) analysis, it is found that iodine plays an important role in the modification of the copper nanocrystals through the formation of an adlayer on the basal plane of the nanoplates. Cu NPLs with an average edge length of 10 μm are successfully synthesized, and these Cu NPLs are the largest copper 2D crystals synthesized by a solution-based process so far. The application of the metallic 2D crystals as a semitransparent electrode proves their feasibility as a conductive filler, exhibiting very low sheet resistance (0.4 Ω ▫ ) compared to Cu NWs and a transmittance near 75%. The efficient charge transport is due to the increased contact area between each Cu NPL, i.e., so-called plane contact (2D electrical contact). In addition, this type of contact enhances the current-carrying capability of the Cu NPL electrodes, implying that the large-size Cu NPLs are promising conductive fillers for printable electrode applications.

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“…The growth of very small, preformed spherical gold seeds into anisotropic nanoparticles requires symmetry-breaking components, e.g., cationic surfactants like CTAB . However, the anisotropic nanocrystal growth can be influenced by a specific addition of halide ions , or by changing the kinetic conditions . Therefore, the crystallization process can lead to rod-shaped or platelet structures.…”

Section: Introductionmentioning

confidence: 99%

Ostwald Ripening Growth Mechanism of Gold Nanotriangles in Vesicular Template Phases

2016

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The mechanism of nanotriangle formation in multivesicular vesicles (MMV) is investigated by using time dependent SAXS measurements in combination with UV-vis spectroscopy, light and transmission electron microscopy. In the first time period 6.5 nm sized spherical gold nanoparticles are formed inside of the vesicles, which build up soft nanoparticle aggregates. In situ SAXS experiments show a linear increase of the volume and molar mass of nanotriangles in the second time period. The volume growth rate of the triangles is 16.1 nm3/min and the growth rate in vertical direction only 0.02 nm/min. Therefore, flat nanotriangles with a thickness of 7 nm and diameters of 23 nm are formed. This process can be described by a diffusion-limited Ostwald ripening growth mechanism. TEM micrographs visualize soft coral-like structures with thin nanoplatelets at the periphery of the aggregates, which disaggregate in the third time period into nanotriangles and spherical particles. The 16 times faster growth of nanotriangles in lateral than that in vertical direction is related to the adsorption of symmetry breaking components, i.e., AOT and the polyampholyte PalPhBisCarb, on the {111} facets of the gold nanoplatelets in combination with confinement effects of the vesicular template phase.

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Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

Cited by 12 publications

References 34 publications

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO₂ Reduction

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO₂ Reduction

2D Single‐Crystalline Copper Nanoplates as a Conductive Filler for Electronic Ink Applications

Ostwald Ripening Growth Mechanism of Gold Nanotriangles in Vesicular Template Phases

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Influence of iodide ions on morphology of silver growth on gold hexagonal nanoplates

Cited by 12 publications

References 34 publications

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO2 Reduction

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO2 Reduction

2D Single‐Crystalline Copper Nanoplates as a Conductive Filler for Electronic Ink Applications

Ostwald Ripening Growth Mechanism of Gold Nanotriangles in Vesicular Template Phases

Contact Info

Product

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About

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO₂ Reduction

Site-Selective Growth of AgPd Nanodendrite-Modified Au Nanoprisms: High Electrocatalytic Performance for CO₂ Reduction