Interfacial Effects in PdAg Bimetallic Nanosheets for Selective Dehydrogenation of Formic Acid

Hu, Chen; Mu, Xiaoliang; Fan, Jingmin; Ma, Hao; Zhao, Xiaojing; Chen, Guangxu; Zhou, Zhi‐You; Zheng, Nanfeng

doi:10.1002/cnma.201500162

Cited by 80 publications

(60 citation statements)

References 38 publications

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“…[7d] These XPS data indicate that the binding energy of both Pd and Ag were shifted to lower values in the PdAg-HNs due to the increased charge density in d-band with al oss in sp-band. [18] In the PdAg-HNs catalysts, the interatomicc harget ransfer that originated from Ag to the Pd atoms owing to the net differencei n work function strengthens the adsorption of formate through strong back-donation. [19] CV curves from À0.8 to 0.2 Vw ith the same Pd loading were used for ap reliminary investigation of the electrochemical properties of the as-prepared commercial Pd/C, Pd, Pd 1 Ag 3 -HNs, Pd 3 Ag 1 -HNs and Pd 1 Ag 1 -HNs catalysts.…”

Section: Resultsmentioning

confidence: 99%

Design of PdAg Hollow Nanoflowers through Galvanic Replacement and Their Application for Ethanol Electrooxidation

Bin

Yang

Zhang

et al. 2016

Chemistry A European J

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In this study, galvanic replacement provides a simple route for the synthesis of PdAg hollow nanoflower structures by using the Ag-seeds as sacrificial templates in the presence of l-ascorbic acid (reductant) and CTAC (capping agent). Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and EDS mapping were used to characterize the as-prepared PdAg hollow nanoflower catalysts, where they were alloyed nanoflower structures with hollow interiors. By maneuvering the Pd/Ag ratio, we found that the as-prepared Pd Ag hollow nanoflower catalysts had the optimized performance for catalytic activity toward ethanol oxidation reaction. Moreover, these as-prepared PdAg hollow nanoflower catalysts exhibited noticeably higher electrocatalytic activity as compared to pure Pd and commercial Pd/C catalysts due to the alloyed Ag-Pd composition as well as the hollow nanoflower structures. It is anticipated that this work provides a rational design of other architecturally controlled bimetallic nanocrystals for application in fuel cells.

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Section: Resultsmentioning

confidence: 99%

Design of PdAg Hollow Nanoflowers through Galvanic Replacement and Their Application for Ethanol Electrooxidation

Bin

Yang

Zhang

et al. 2016

Chemistry A European J

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“…Besides, the importance of the hollow structure, in which most of the atoms are located on the surface of the nanoparticles, was also evidenced by comparison with a AgPd/G counterpart catalyst. Zheng et al studied the synergetic effects of PdAg nanoparticles in the decomposition of FA by using two-dimensional ultrathin PdAg bimetallic nanosheets as model catalysts [66]. Such structures were selected to study the Pd-Ag synergic effect because, as in the case of hollow bimetallic nanostructures previously mentioned [68], they have a high fraction of active sites on the surface.…”

Section: Carbon-supported Pdag Catalystsmentioning

confidence: 99%

Hydrogen Production from Formic Acid Attained by Bimetallic Heterogeneous PdAg Catalytic Systems

2019

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The production of H 2 from the so-called Liquid Organic Hydrogen Carriers (LOHC) has recently received great focus as an auspicious option to conventional hydrogen storage technologies. Among them, formic acid, the simplest carboxylic acid, has recently emerged as one of the most promising candidates. Catalysts based on Pd nanoparticles are the most fruitfully investigated, and, more specifically, excellent results have been achieved with bimetallic PdAg-based catalytic systems. The enhancement displayed by PdAg catalysts as compared to the monometallic counterpart is ascribed to several effects, such as the formation of electron-rich Pd species or the increased resistance against CO-poisoning. Aside from the features of the metal active phases, the properties of the selected support also play an important role in determining the final catalytic performance. Among them, the use of carbon materials has resulted in great interest by virtue of their outstanding properties and versatility. In the present review, some of the most representative investigations dealing with the design of high-performance PdAg bimetallic heterogeneous catalysts are summarised, paying attention to the impact of the features of the support in the final ability of the catalysts towards the production of H 2 from formic acid.Energies 2019, 12, 4027 2 of 27 fact, it is challenging not only for developed countries in which the living standard requires large energy supplies, but also for those developing countries that experience a high population growth.Among greenhouse gases, carbon dioxide (CO 2 ) is considered the most important because, even though its global warming potential (GWP) is much lower than that of other gases, the emissions of CO 2 are far more abundant. GWP parameter was developed to compare the global warming impacts of different gases and it is a measure of how much energy the emissions of 1 ton of a gas will absorb over a given period, relative to the emissions of 1 ton of CO 2 , which is used as the reference. Then, CO 2 has a GWP of 1 regardless of the time used, while GWP is 28-36 and 265-298 times that of CO 2 for methane (CH 4 ) and nitrous oxide (N 2 O), respectively [1]. Such considerations, that are nowadays central scientific and social concerns, have a long historical background within the research community. Arrhenius was among the first to hypothesise about the impact of CO 2 on the Earth's climate [2], but his hypothesis was overlooked until the 1950s [3]. Now, after more than half a century, there is not yet a chemical process able to efficiently clean the growing volumes of CO 2 in the atmosphere. Some interesting actions taken so far are related to the production of hydrocarbon fuels by recycling H 2 O and CO 2 with renewable energy sources or the CO 2 capture and sequestration (CCS) technology [4][5][6][7].In such energy and environmental context, the search for alternative carbon emission-free energy sources is required to avoid further disastrous consequences. Hydrogen (H 2 ), a carbon-free fuel, is consi...

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“…It is worth mentioning that Ag‐enriched Ag‐Pd nanoframes could become extremely susceptible to some conditions under which oxidation could etch Ag from the alloy, leading to the fracture of nanoframes. Taken together, this new class of hollow and porous alloyed nanostructures holds a great promise for catalytic applications owing to their high specific surface areas and other unique characteristics different from their individual components …”

Section: Figurementioning

confidence: 99%

Ag‐Enriched Ag‐Pd Bimetallic Nanoframes and Their Catalytic Properties

Sun

Qin

2016

ChemNanoMat

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We reportafacile synthesis of Ag-enriched Ag-Pd bimetallic nanoframes with ridges as thin as 1.7 nm. The synthesis involvesc o-titration of aqueous AgNO 3 and Na 2 PdCl 4 solutions into an aqueous suspension of Ag nanocubesa tr oom temperature in the presence of ascorbic acid and poly(vinyl pyrrolidone). The Ag and Pd atoms derived from the co-reduction by ascorbic acid are co-deposited on the edge and corner sites of Ag nanocubes for the generation of Ag@Ag-Pd core-frame nanocubes. When subjected to H 2 O 2 etching,t he Ag cores are selectively removed to generate Ag-Pd bimetallic nanoframes made of ultrathin ridges enriched in Ag. In comparison to both the Ag nanocubes and Ag@Ag-Pd core-frame nanocubes, the Ag-Pd bimetallic nanoframes exhibit markedly enhanced activity in catalyzing the reduction of 4-nitrophenol by NaBH 4 .[a] Dr.

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Interfacial Effects in PdAg Bimetallic Nanosheets for Selective Dehydrogenation of Formic Acid

Cited by 80 publications

References 38 publications

Design of PdAg Hollow Nanoflowers through Galvanic Replacement and Their Application for Ethanol Electrooxidation

Design of PdAg Hollow Nanoflowers through Galvanic Replacement and Their Application for Ethanol Electrooxidation

Hydrogen Production from Formic Acid Attained by Bimetallic Heterogeneous PdAg Catalytic Systems

Ag‐Enriched Ag‐Pd Bimetallic Nanoframes and Their Catalytic Properties

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