A centimeter scale self-standing two-dimensional ultra-thin mesoporous platinum nanosheet

Li, Yunqi; Liu, Yuwei; Li, Jing; Xiong, Danping; Chen, Xiran; Liu, Mingtao; Zhong, Zheng; Malgras, Victor; Bandô, Yoshio; Yamauchi, Yusuke; Xu, Jun

doi:10.1039/c9mh01142k

Cited by 20 publications

(19 citation statements)

References 33 publications

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“…For example, centimeter‐scale free‐standing mesoporous Pt nanosheets prepared through the Si wafer solid surface oriented assembly of single micelles demonstrated a higher onset potential and a larger diffusion limited current density than commercially available Pt/C materials in an acidic condition, suggesting that the 2D nanosheets patterned with ordered mesopores are beneficial for the ORR activity. [ 39 ] Moreover, the incorporation of Ni metal to make composite mesoporous PtNi nanosheets further increased the performance of Pt, which was resulted from the enhanced absorption for both O and OH intermediates after Ni doping, as suggested by the DFT calculation ( Figure ). To develop much cheaper electrocatalysts, great efforts have been devoted to develop non‐precious transitional metal‐based electrocatalysts.…”

Section: Applicationsmentioning

confidence: 96%

“…By using a similar concept but a different 2D patterning methodology, a centimeter‐scale freestanding mesoporous Pt nanosheets were prepared through the conformed assembly of core–shell–corona single micelles made of poly (styrene‐ b ‐2‐vinyl pyridine‐ b ‐ethylene oxide) (PS‐ b ‐P2VP‐ b ‐PEO) triblock copolymers on Si wafers (Figure 6f–j). [ 39 ] In a typical synthesis, the pure PS‐ b ‐P2VP‐ b ‐PEO block copolymer micelle methanol solution was first prepared through a dialysis method. Then, the adjustment of the solution pH to acidic triggered the protonation of P2VP, which can further interact with the negatively charged PtCl 6 2− ions by electrostatic attraction to form PS‐ b ‐P2VP‐ b ‐PEO/PtCl 6 2− composite micelles.…”

Section: Bottom‐up Assembly Of Single Micelles Toward 2dommsmentioning

confidence: 99%

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Pushing the Limit of Ordered Mesoporous Materials via 2D Self‐Assembly for Energy Conversion and Storage

Qiu

Zhao

Fang

et al. 2020

Adv Funct Materials

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Material and energy efficiencies are two key parameters that benchmark the electrochemical energy conversion and storage devices (EECSDs). Maximizing both requires researchers to grasp the limits of the physiochemical properties of core electrode materials. Ordered mesoporous materials (OMMs) have been regarded as promising electrode materials; however, their intrinsic deficiencies (e.g., plugs, inaccessible pores, and surfaces) impose limits for wide applications. 2D ordered mesoporous materials (2DOMMs) featured with an extended lateral dimension and a nanometer thickness not only inherit the structure advantages of mesoporous materials, but also have a unique 2D ultrathin feature that can fully address the imperfections of conventional OMMs. Herein, recent achievements on the preparation of 2DOMMs by combining single micelle assembly strategy with 2D bottom‐up patterning techniques including the molecular/space confined, interfacial orientated, and surface limited assembly are focused. Special focus is devoted to the newly developed synthetic strategies and their fundamental mechanisms for accurate control of some key structural parameters. Recent advances of 2DOMMs in EECSDs are also highlighted, which suggest that 2DOMMs are excellent material platforms for developing new battery chemistry as well as targeting performance optimization and cost reduction. Finally, the challenges and prospects are proposed based on current development.

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Section: Applicationsmentioning

confidence: 96%

Section: Bottom‐up Assembly Of Single Micelles Toward 2dommsmentioning

confidence: 99%

Pushing the Limit of Ordered Mesoporous Materials via 2D Self‐Assembly for Energy Conversion and Storage

Qiu

Zhao

Fang

et al. 2020

Adv Funct Materials

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“…[54] Synthesis of centimeter scale mesoporous film with single-layer template by single-layer micelle film laid on the substrate has also been realized. [55] Specific steps are spin-coating the methanol solution of PS-b-PVP-b-PEO and H 2 PtCl 6 on the SiO x /Si substrate, and evaporating solvent (Figure 5f). Under the atomic force microscope (AFM), it can be observed that the single-layer PS-b-PVP-b-PEO spherical micelles are arranged in an orderly manner on the substrate when the micelle concentration is adequate (Figure 5k-n).…”

Section: Soft Template Strategymentioning

confidence: 99%

mentioning

confidence: 99%

Porous Noble Metal Electrocatalysts: Synthesis, Performance, and Development

Chen

2021

Small

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Benefiting from the various structures of channel, skeleton, and pore wall, porous materials are more valuable than nonporous and ultra-small counterparts in practical applications. In regard to porous catalyst, higher surface area logically means more exposed active sites, and reasonable channel structure ensures the accessibility of active sites. Optimization of pore structure, which includes pore size, pore dimensions, and the pore size distributions, would bring enhanced catalytic activity. Besides, to a certain extent, compared with ultra-fine or ultrasmall nanocrystals, porous catalysts constructed by primary particles have higher stability to ensure maximum retention of active sites, and the increased stability can be attributed to the suppression of Ostwald ripening. Meanwhile the influence of porous structure on the catalytic selectivity cannot be ignored, for instance, microporous materials have a shape-selective catalytic effect on reactants, intermediates, and products of different sizes. In porous materials with larger pores, for catalytic reactions with multi-stage reaction products, the mass transfer Active sites (intrinsic activity, quantity, and distribution), electron transfer, and mass diffusion are three important factors affecting the performance of electrocatalysts. Composed of highly active components which are built into various network structures, porous noble metal is an inherently promising electrocatalysts. In recent years, great efforts have been made to explore new efficient synthesis methods and establish structural-performance relationships in the field of porous noble metal electrocatalysis. In this review, the very recent progress in strategies for preparing porous noble metal, including innovation and deeper understanding of traditional methods is summarized. A discussion of relationship between porous noble metal structure and electrocatalytic performance, such as accessibility of active sites, connectivity of skeleton structures, channels dimensions, and hierarchical structures, is provided. rate affected by the shape and dimensions of the pores can also affect the diffusion rate of the primary reaction products and improve the selectivity of the secondary reaction products. [1] For solid catalysts, the species and coordination state of surface atoms could influence the intrinsic activity of active sites, and in porous materials with tortuous channel structure and rough pore wall, atoms with different coordination states exposed on the pore wall would exert different abilities to adsorb and activate reactant molecules.Noble metals possess suitable electronic structures, which gives it a significant innate advantage of excellent catalytic activity and stability. From the perspective of d-band center theory, proper d-band center positions of the noble metals give rise to a moderate chemical adsorption strength for the reactants, intermediate species, and products during the catalytic process. This means noble metals can adsorb and activate the reactant molecules moderately while...

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“…[ 18 ] Large‐sized structure like bulk structure possesses high stability in structure, but limited exposed surface and massive sites not utilized inside are obstacles for applications. [ 19,20 ] Porous nanostructures with higher surface‐to‐volume ratios exhibit higher activity by providing more active sites for contact with reactants, but the reported porous noble metals are generally small in size. Smaller nanostructures are more prone to change in shape or aggregate in performance testing or practical application, leading to a rapid decline in activity over time.…”

Section: Introductionmentioning

confidence: 99%

Interface and Charge Induced Molecular Self‐Assembly Strategy for the Synthesis of Reduced Graphene Oxide Coated with Mesoporous Platinum Sheets

Han

Yang

Feng

et al. 2022

Macromol. Rapid Commun.

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The design of porous noble metal catalysts holds great promise in various electrocatalytic applications. However, it is still a challenge to improve the durability performance through constructing stable framework. Here, an interface and charge induced strategy is developed to synthesize large‐sized continuous reduced graphene oxide@mesoporous platinum (denoted as rGO@mPt) sheets under kinetic control by molecular self‐assembly design. Graphene oxide (GO) is a promising large‐sized growth interface for platinum. Cationic surfactant dioctadecyldimethylammonium chloride bridges the negatively charged GO and platinum precursors, while creating interconnected mesopores. The successful synthesis of rGO@mPt sheets relies on proper kinetic control, which is achieved by controlling pH, temperature, and the complexation of bromide ions. rGO@mPt sheets present strong crystallinity with a pure face‐centered cubic Pt phase. Worm‐like mesostructures with an average pore size of 2.2 nm exist throughout the sheets. rGO@mPt sheets possess both stable framework and abundant active sites, which markedly improve the durability on methanol oxidation reaction while maintaining relatively good catalytic activity. Long‐term stability test shows a slight loss of 1.2% activity after 250 cycles. Amperometric i–t curves reveal the mass current three times higher compared to commercial Pt/C at 3000 s.

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A centimeter scale self-standing two-dimensional ultra-thin mesoporous platinum nanosheet

Abstract: A kind of mesoporous 2D Pt nanosheets with unique structural features exhibits a high electrocatalytic activity towards the oxygen reduction reaction (ORR).

Cited by 20 publications

References 33 publications

Pushing the Limit of Ordered Mesoporous Materials via 2D Self‐Assembly for Energy Conversion and Storage

Pushing the Limit of Ordered Mesoporous Materials via 2D Self‐Assembly for Energy Conversion and Storage

Porous Noble Metal Electrocatalysts: Synthesis, Performance, and Development

Interface and Charge Induced Molecular Self‐Assembly Strategy for the Synthesis of Reduced Graphene Oxide Coated with Mesoporous Platinum Sheets

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