Facile preparation of a variety of bimetallic dendrites with high catalytic activity by two simultaneous replacement reactions

Liu, Jun; Wu, Qian; Huang, Fuli; Zhang, Hefang; Xu, Shili; Huang, Wei; Li, Zelin

doi:10.1039/c3ra41268g

Cited by 32 publications

(22 citation statements)

References 67 publications

(76 reference statements)

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“…When this was done, little 4-NP was adsorbed to the catalyst. As shown in Fig 6A, complete reduction of 4-NP occurred in 160 s, which is faster than previously reported rates (Zeng et al, 2013;Chu et al, 2011;Posada et al, 2006;Liu et al, 2013;Yao et al, 2015). We did experiment to investigate the adsorption effect in the absence of Cu/ Cu 2 O/CuO@C, the result showed that UV-vis adsorption spectra of 4-NP didn't change during 10 h with the addition of NaBH4 (Fig.…”

Section: Catalytic Capabilitymentioning

confidence: 59%

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Zhao

Tan

et al. 2016

Science of The Total Environment

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• We present an effective catalyst for reductive degradation of organic dyes and phenols in water.• Compared with noble metals, Cu/Cu 2 O/ CuO@C particles are more efficient and less expensive • The porous structure provided a large contact area and channels for the pollutions and active site. , infrared spectroscopy and Raman analysis, revealed that it was composed of graphitized carbon with numerous nanoparticles (100 nm in diameter) of Cu/CuO/Cu 2 O that were uniformly distributed on internal and external surfaces of the carbon support. Gallic acid (GA) has been used as both organic ligand and carbon precursor with metal organic frameworks (MOFs) as the sacrificial template and metal oxide precursor in this green synthesis. The material combined the advantages of MOFs and Cu-containing materials, the porous structure provided a large contact area and channels for the pollutions, which results in more rapid catalytic degradation of pollutants and leads to greater efficiency of catalysis. The material gave excellent catalytic performance for organic dyes and phenols. In this study, Cu/Cu 2 O/CuO@C was used as catalytic to reduce 4-NP, which has been usually adopted as a model reaction to check the catalytic ability. Catalytic experiment results show that 4-NP was degraded approximately 3 min by use of 0.04 mg of catalyst and the conversion of pollutants can reach more than 99%. The catalyst exhibited little change in efficacy after being utilized five times. Rates of degradation of dyes, such as Methylene blue (MB) and Contents lists available at ScienceDirectScience of the Total Environment j o u r n a l h o m e p a g e : w w w . e l s e v i e r . c o m / l o c a t e / s c i t o t e n v Rhodamine B (RhB) and phenolic compounds such as O-Nitrophenol (O-NP) and 2-Nitroaniline (2-NA) were all similar.

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Section: Catalytic Capabilitymentioning

confidence: 59%

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Zhao

Tan

et al. 2016

Science of The Total Environment

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“…50 Besides, the abundant of NaBH 4 might benefit to protect p-AP from aerial oxidation. 50 Besides, the abundant of NaBH 4 might benefit to protect p-AP from aerial oxidation.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation of reduced graphene oxide supported PtNi alloyed nanosnowflakes with high catalytic activity

et al. 2015

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A facile hydrothermal strategy was designed for the preparation of alloyed PtNi nanosnowflakes supported on reduced graphene oxide (PtNi nanosnowflakes/RGO), with the assistance of N, N-dimethylformamide (DMF) as the solvent and reductant, and ethylenediamine as the surfactant and capping agent. The as-obtained nanocomposites were mainly characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) andRaman spectroscopy, which showed enhanced catalytic activity and better stability over commercial Pt/C (10 wt. %) in the catalytic reduction of p-nitrophenol to p-aminophenol. 3 catalysis. 19 Among them, Pt-based nanostructures, particularly alloying with transition metals, have received widespread research attention thanks to their high catalytic activity for many industrially important reactions. 20 For example, PtNi, 21 PtFe, 22PtCu, 23 and PtCo 24 were prepared and used as high-performance hybrid electrocatalysts in the literature. Goodman's group found that Ni-Pt surfaces with Ni coverage in the monolayer regime showed higher hydrogenolysis activity than those of their individual counterparts (i.e., single Ni and Pt). 25 The improved catalytic activity is attributed to the synergetic effects such as geometric and electronic effects originated from the lattice contraction and downshift of the d-band center of Pt in the bimetallic structures. 14 Graphene oxide (GO) has many oxygen-containing functional groups on its surface such as hydroxyl, epoxide, carbonyl, and carboxyl groups, which provide chemically active sites available for metal nanoparticles anchoring and dispersion. 26,27 It is also beneficial to avoid metal nanoparticles from aggregation, thereby resulting into highly dispersed metal nanoparticles with ultra-small sizes. Moreover, GO is a low-cost carbon material that can be easily reduced to graphene. In addition, graphene-supported Pt-based catalysts demonstrate improved catalytic performances and undergo less poisoning by CO-like intermediates during methanol oxidation reaction as compared to those supported on commercial carbon black. 28Herein, a simple and facile hydrothermal method was developed for one-pot synthesis of PtNi nanosnowflakes anchored on reduced graphene oxide (RGO). The catalytic performance of PtNi nanosnowflakes/RGO was also investigated, using the 5 room temperature naturally. The resulting black precipitates were collected by centrifugation and thoroughly washed with ethanol for several times, and dried at 60 °C in vacuum for further characterization. CharacterizationThe morphology and microstructure of the samples were determined by transmission electron microscopy (TEM) and high-resolution TEM (HR-TEM) on a JEM-2100F transmission electron microscope operating at an acceleration voltage of 200 kV attached with selective area electron diffraction (SAED) and energy dispersive X-ray spectrometer (EDS). The elemental mappings were recorded on the scanning transmission electron microscope (STEM) with a high-angle annular d...

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“…During this process, Pd-Cu alloy was formed. It is possible that the adding of ammonia favors the formation of Pd-Cu alloy [ 25 , 26 ]. We believe the PVP plays a crucial role as a structure-directing agent during the reduction, which is similar to the system of the Pt-Cu under the circumstance of cetyltrimethylammonium bromide (CTAB).…”

Section: Resultsmentioning

confidence: 99%

One-Pot Synthesis of Hierarchical Flower-Like Pd-Cu Alloy Support on Graphene Towards Ethanol Oxidation

et al. 2017

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The synergetic effect of alloy and morphology of nanocatalysts play critical roles towards ethanol electrooxidation. In this work, we developed a novel electrocatalyst fabricated by one-pot synthesis of hierarchical flower-like palladium (Pd)-copper (Cu) alloy nanocatalysts supported on reduced graphene oxide (Pd-Cu(F)/RGO) for direct ethanol fuel cells. The structures of the catalysts were characterized by using scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectrometer (XPS). The as-synthesized Pd-Cu(F)/RGO nanocatalyst was found to exhibit higher electrocatalytic performances towards ethanol electrooxidation reaction in alkaline medium in contrast with RGO-supported Pd nanocatalyst and commercial Pd black catalyst in alkaline electrolyte, which could be attributed to the formation of alloy and the morphology of nanoparticles. The high performance of nanocatalyst reveals the great potential of the structure design of the supporting materials for the future fabrication of nanocatalysts.

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Facile preparation of a variety of bimetallic dendrites with high catalytic activity by two simultaneous replacement reactions

Cited by 32 publications

References 67 publications

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Cu/Cu2O/CuO loaded on the carbon layer derived from novel precursors with amazing catalytic performance

Facile preparation of reduced graphene oxide supported PtNi alloyed nanosnowflakes with high catalytic activity

One-Pot Synthesis of Hierarchical Flower-Like Pd-Cu Alloy Support on Graphene Towards Ethanol Oxidation

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