Pt/single-stranded DNA/graphene nanocomposite with improved catalytic activity and CO tolerance

Li, Mengzhu; Pan, Yuxia; Guo, Xiaoyu; Liang, Yinhua; Wu, Yiping; Wen, Ying; Yang, Haifeng

doi:10.1039/c5ta00891c

Cited by 35 publications

(22 citation statements)

References 40 publications

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“…By using the π–π interaction between ssDNA and RGO, Li et al created ssDNA–RGO composites for the further bioinspired synthesis of cotton-flower-like platinum nanoparticles (PtNPs) [ 82 ]. The ssDNA molecules were conjugated with RGO via the π–π interaction and PtNPs were formed on the surface of ssDNA–RGO by the bioinspired synthesis.…”

Section: Internal Interactions Towards Biomolecular Self-assemblymentioning

confidence: 99%

Controlling the Self-Assembly of Biomolecules into Functional Nanomaterials through Internal Interactions and External Stimulations: A Review

et al. 2019

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Biomolecular self-assembly provides a facile way to synthesize functional nanomaterials. Due to the unique structure and functions of biomolecules, the created biological nanomaterials via biomolecular self-assembly have a wide range of applications, from materials science to biomedical engineering, tissue engineering, nanotechnology, and analytical science. In this review, we present recent advances in the synthesis of biological nanomaterials by controlling the biomolecular self-assembly from adjusting internal interactions and external stimulations. The self-assembly mechanisms of biomolecules (DNA, protein, peptide, virus, enzyme, metabolites, lipid, cholesterol, and others) related to various internal interactions, including hydrogen bonds, electrostatic interactions, hydrophobic interactions, π–π stacking, DNA base pairing, and ligand–receptor binding, are discussed by analyzing some recent studies. In addition, some strategies for promoting biomolecular self-assembly via external stimulations, such as adjusting the solution conditions (pH, temperature, ionic strength), adding organics, nanoparticles, or enzymes, and applying external light stimulation to the self-assembly systems, are demonstrated. We hope that this overview will be helpful for readers to understand the self-assembly mechanisms and strategies of biomolecules and to design and develop new biological nanostructures or nanomaterials for desired applications.

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Section: Internal Interactions Towards Biomolecular Self-assemblymentioning

confidence: 99%

Controlling the Self-Assembly of Biomolecules into Functional Nanomaterials through Internal Interactions and External Stimulations: A Review

et al. 2019

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“…Such a unique structure confers graphene excellent electrical and thermal conductivity that facilitate electron transfer to nanoparticles and consequently enhance catalytic activities of nanoparticles. Therefore, rGO is considered as an excellent support for nanocatalysts and great efforts have been made to synthesize nanocomposites of nanoparticles/rGO …”

Section: Introductionmentioning

confidence: 99%

“…Therefore, rGO is considered as an excellent support for nanocatalysts and great efforts have been made to synthesize nanocomposites of nanoparticles/rGO. 4,5 Palladium (Pd) nanoparticles are broadly used in catalytic reactions including Suzuki reaction, hydrogenation, -aldylation of ketones, etc. Graphene-supported Pd nanocatalysts with different size, composition and morphology have been prepared using various methods, such as chemical or electrochemical reduction, heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Microbial synthesis of graphene‐supported highly‐dispersed Pd‐Ag bimetallic nanoparticles and its catalytic activity

Han

Song

Wang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Graphene‐supported nanocomposites are promising catalysts for their unique properties. Biosynthesis of such hybrid catalysts possesses several advantages over other methods such as less pollution. The palladium nanoparticle has versatile catalytic activities and its stability and activities can be significantly improved through hybridization with other nanomaterials including graphene. RESULTS In this study, bimetallic palladium‐silver nanoparticles supported on graphene (Pd‐Ag/rGO) was prepared through one‐step biosynthesis using a bacterium Shewanella oneidensis MR‐1. Shewanella oneidensis MR‐1 synthesized Pd‐Ag/rGO through simultaneous reduction of silver nitrate (AgNO3), palladium(II) nitrate (Pd(NO3)2) and graphene oxide (GO). The morphology and composition of the Pd‐Ag/rGO were characterized by transmission electron microscopy, energy dispersive X‐ray, X‐ray diffraction, X‐ray photoelectron spectroscopy, Fourier‐transform infrared spectroscopy and Raman spectroscopy. Furthermore, the hydrogenation activity of synthesized Pd‐Ag/rGO was tested using 4‐nitrophenol as a model chemical at room temperatures and pressure. The Pd‐Ag/rGO showed the best catalytic performance when Pd/Ag ratio was 1:1 and bacterial concentration was 1.0 of OD600 (optical density measured at a wavelength of 600 nm) for the preparation of Pd‐Ag/rGO. Therefore, the kinetic rate constant for 4‐NP reduction was 0.2413 min−1 catalyzed by as‐prepared Pd‐Ag/rGO, which is listed as one of the top level reported catalysts for 4‐NP reduction. CONCLUSION Therefore, this study demonstrated a material and energy‐saving method to synthesize hybrid nanoparticles supported on graphene with high catalytic activity. © 2019 Society of Chemical Industry

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“…The chronoamperometry test has the advantage of observing the change in the HOR current at room temperature since only small amounts of catalysts are evaluated on a glassy carbon electrode. However, conventional chronoamperometry has difficultly in distinguishing the superiority of catalysts with relatively high CO tolerance, despite the physical characteristics (surface structure and composition) of the catalysts being different [19,20,21,22,23,24]. For instance, if a novel catalyst with a much higher CO tolerance is designed and surpasses the CO tolerance of the PtRu catalyst, the chronoamperometry technique cannot be a useful method in identifying the novelty of the developed catalysts since the performance difference is not very divergent in the chronoamperogram [24].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Analysis for Demonstrating CO Tolerance of Catalysts in Polymer Electrolyte Membrane Fuel Cells

et al. 2019

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Since trace amounts of CO in H2 gas produced by steam reforming of methane causes severe poisoning of Pt-based catalysts in polymer electrolyte membrane fuel cells (PEMFCs), research has been mainly devoted to exploring CO-tolerant catalysts. To test the electrochemical property of CO-tolerant catalysts, chronoamperometry is widely used under a CO/H2 mixture gas atmosphere as an essential method. However, in most cases of catalysts with high CO tolerance, the conventional chronoamperometry has difficulty in showing the apparent performance difference. In this study, we propose a facile and precise test protocol to evaluate the CO tolerance via a combination of short-term chronoamperometry and a hydrogen oxidation reaction (HOR) test. The degree of CO poisoning is systematically controlled by changing the CO adsorption time. The HOR polarization curve is then measured and compared with that measured without CO adsorption. When the electrochemical properties of PtRu alloy catalysts with different atomic ratios of Pt to Ru are investigated, contrary to conventional chronoamperometry, these catalysts exhibit significant differences in their CO tolerance at certain CO adsorption times. The present work will facilitate the development of catalysts with extremely high CO tolerance and provide insights into the improvement of electrochemical methods.

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Pt/single-stranded DNA/graphene nanocomposite with improved catalytic activity and CO tolerance

Abstract: The ssDNA–RGO/cotton-flower-like-Pt nanocomposite with an open structure showed high catalytic activity for methanol and promising ability against CO poisoning. The latter was due to abundant OH species induced by N atoms in ssDNA, and oxygen species in both ssDNA and RGO.

Cited by 35 publications

References 40 publications

Controlling the Self-Assembly of Biomolecules into Functional Nanomaterials through Internal Interactions and External Stimulations: A Review

Controlling the Self-Assembly of Biomolecules into Functional Nanomaterials through Internal Interactions and External Stimulations: A Review

Microbial synthesis of graphene‐supported highly‐dispersed Pd‐Ag bimetallic nanoparticles and its catalytic activity

Electrochemical Analysis for Demonstrating CO Tolerance of Catalysts in Polymer Electrolyte Membrane Fuel Cells

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