General promoting effect of polydopamine on supported noble metal catalysts

Zhang, Mingwei; Li, Guozhu; Sun, Xiaoling; Jiang, Yujiao; Zhang, Xiangwen

doi:10.1039/c7ta06204d

Cited by 32 publications

(31 citation statements)

References 40 publications

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“…It is widely accepted that capping molecules adsorb to the metal surface to change its surface energy . Li et al . indicated that the reaction rate constant is related to the intitial adsorption of 4‐NP on the catalyst of noble mental.…”

Section: Resultsmentioning

confidence: 99%

“…It is conjectured that π‐π or p‐π strong interaction between the giant π bonds of rGO nanosheet and benzene ring of 4‐NP . Besides, dextran with multiply hydroxyl groups on Pt NPs can withdraw electrons of Pt‐NPs to reach the optimal adsorption energy of reactant ,,…”

Section: Resultsmentioning

confidence: 99%

“…In homogenous catalysts, ligand can serve as electric-withdrawing to reduce the electron density of metal to adjust the property of metal. [29] Li et al [18] illuminated that the interaction between d orbit of metal and nitro group of 4-NP can result in the transfer of electron. The donner-acceptor effects could lead to intriguing positions.…”

Section: Dft Calculationsmentioning

confidence: 99%

“…[37] Besides, dextran with multiply hydroxyl groups on Pt NPs can withdraw electrons of Pt-NPs to reach the optimal adsorption energy of reactant. [18,29,37]…”

Section: Catalytic Activity and Stabilitymentioning

confidence: 99%

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Toward an Understanding of Capping Molecules on Pt Nanoparticles for Hydrogenation: the Key Role of Hydroxyl Groups

Hou

Sun

et al. 2019

ChemistrySelect

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Preparation of active and stable platinum nanoparticles (Pt NPs) for hydrogenation is of great importance. Herein, a joint experimental and theoretical study has been conducted to investigate the role of capping molecules on Pt NPs for hydrogenation. Both small biomolecules of adenine, D‐ribose, adenosine, and 2′‐deoxyadenosine and macromolecule of dextran have been studied as capping agents of Pt NPs. Kinetic data are collected and fitted for deep insight and clear comparison of Pt activity. TEM, SEM, XRD, nitrogen adsorption‐desorption were employed to characterize the obtained catalysts. DFT calculations have been carried out to investigate the exact interactions in this system. A volcano plot is obtained between the adsorption energy of 4‐NP on various Pt NPs against reaction rate constant (k), which is in accordance with the Brønsted‐Evans‐Polanyi (BEP) relation. Moreover, active and stable catalyst (Pt/rGO) has been prepared using dextran as capping agent and rGO as support. The hydrogenation of 4‐NP over Pt/rGO can reach 100% conversion in only 2 min. The catalyst can still maintain its activity after solvent removal and long‐time storage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Dft Calculationsmentioning

confidence: 99%

“…[37] Besides, dextran with multiply hydroxyl groups on Pt NPs can withdraw electrons of Pt-NPs to reach the optimal adsorption energy of reactant. [18,29,37]…”

Section: Catalytic Activity and Stabilitymentioning

confidence: 99%

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Toward an Understanding of Capping Molecules on Pt Nanoparticles for Hydrogenation: the Key Role of Hydroxyl Groups

Hou

Sun

et al. 2019

ChemistrySelect

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“…Herein, MoS 2 nanosheets have been shown to be promising candidate components for various fields, such as the detection of water-soluble substances, humidity, and gas species. [22][23][24][25][26] MBAMS was prepared via MoS 2 exfoliation processes and subsequent chemical functionalization process with 4-MBA for realizing the reactivity and selectivity toward the target substance. Here, 4-MBA, a small ligand molecule with a thiol and a carboxyl group, was used to modify the surface of MoS 2 nanosheets.…”

mentioning

confidence: 99%

Control of Volume‐Responsive Properties of Hydrogels through Molybdenum Disulfide Nanosheet Incorporation

Kim

Lee

2019

Adv Materials Technologies

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efforts have been devoted to remove the aforementioned limitations of the PNIPAM hydrogel sensors by incorporating nanomaterials. [17,18] Recently, low dimensional nanomaterials with a large specific surface area such as carbon nanotubes and graphene oxide have been incorporated to hydrophilic polymers such as PNIPAM, chitosan, and polyacrylic acid hydrogels to enhance the adsorption of substances and chemical storage capacity. [19][20][21] In this study, we demonstrate a composite hydrogel of MoS 2 nanosheets functionalized with 4-mercaptobenzoic acid (MBA) and PNIPAM (MBAMS-PNIPAM hydrogel) for the detection of water-soluble phenols. Herein, MoS 2 nanosheets have been shown to be promising candidate components for various fields, such as the detection of water-soluble substances, humidity, and gas species. [22][23][24][25][26] MBAMS was prepared via MoS 2 exfoliation processes and subsequent chemical functionalization process with 4-MBA for realizing the reactivity and selectivity toward the target substance. Here, 4-MBA, a small ligand molecule with a thiol and a carboxyl group, was used to modify the surface of MoS 2 nanosheets. We also verified that we can adjust the phenol detection range by controlling the adsorption and responsivity of the MBAMS-PNIPAM hydrogel through the amount of the incorporated MoS 2 . In addition, we demonstrate an in situ detection strategy of watersoluble phenols by developing an effective transduction strategy to convert the hydrogel volume change into electronic signals. The novel transduction strategy uses a liquid metal-based capacitive transduction method. Furthermore, combined with a handheld signal processor and home-built data-visualization software, we demonstrate a portable detection instrument for phenolic molecules. The instrument successfully detected resorcinol concentrations as low as 10 mg L −1 . As an example, compared to other sensors using optical or electrical mechanisms, [27][28][29] our hydrogel can be readily integrated with existing ducts, containers, or pipe systems without any additional process. Furthermore, above certain concentrations, the hydrogel color change will be large enough to enable detection with the naked eye. As this strategy enables the simple, one-step, and easy detection, it can be easily extended to detect water-soluble chemicals other than phenols in the future. Figure 1a depicts the molecular structure of MBAMS-PNIPAM hydrogels and the detection mechanism of phenols. The surface of MoS 2 was functionalized with 4-MBA molecules to enhance the reactivity and selectivity toward the target phenolic substance and stabilize the hydrogel structure. The target phenolic molecule A composite structure of molybdenum disulfide (MoS 2 ) nanosheets and poly(N-isopropylacrylamide) (PNIPAM) hydrogel is demonstrated for the selective detection of phenols. The incorporation of MoS 2 with a hydrogel system enhances its adsorption and its volume-change response to phenols. It is verified that the phenol detection range can be adjusted by controlling the ...

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Biocompatible Materials Enabled by Biobased Production of Pyomelanin Isoforms Using an Engineered Yarrowia lipolytica

Miller

Springthorpe

Imbrogno

et al. 2021

Adv Funct Materials

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Melanin-like compounds have been studied in recent years for their electron transport and ultraviolet (UV) light absorbance properties as well as applications as functional, biocompatible catalysts, and material additives. Pyomelanin is a unique form of melanin compounds that has not received significant attention. Here, a strain of Yarrowia lipolytica suitable for the production of nearly 2.8 g L −1 of homogentisic acid (HGA) is metabolically engineered, which can then be oxidized to form pyomelanin either in situ or through altering pH. By using this biosourced material, a series of material traits including spectral analysis/UV-vis absorbance properties, electronic and metal interaction/chelation properties, and effectiveness in polymer dispersions with poly(l-lactide) are evaluated. In all cases, biosourced pyomelanin performs on par with or better than a chemically sourced analog. In a performance application, it is explored how pyomelanin may be blended at low concentrations to increase the elasticity of a rigid commercial polymer. Collectively, this work establishes biosourced pyomelanin as a versatile compound for unique material applications.

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General promoting effect of polydopamine on supported noble metal catalysts

Abstract: A joint experimental–theoretical study has been conducted to investigate the role of polydopamine as an interface facilitator for supported noble metal catalysts.

Cited by 32 publications

References 40 publications

Toward an Understanding of Capping Molecules on Pt Nanoparticles for Hydrogenation: the Key Role of Hydroxyl Groups

Toward an Understanding of Capping Molecules on Pt Nanoparticles for Hydrogenation: the Key Role of Hydroxyl Groups

Control of Volume‐Responsive Properties of Hydrogels through Molybdenum Disulfide Nanosheet Incorporation

Biocompatible Materials Enabled by Biobased Production of Pyomelanin Isoforms Using an Engineered Yarrowia lipolytica

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