Hollow raspberry-like PdAg alloy nanospheres: High electrocatalytic activity for ethanol oxidation in alkaline media

Peng, Cheng; Hu, Yongli; Liu, Mingrui; Zheng, Yangong

doi:10.1016/j.jpowsour.2014.12.056

Cited by 108 publications

(81 citation statements)

References 35 publications

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“…Comparatively to other noble metal based materials published, the Pt nanoflower catalysts exceed Pd-Ag nanosphere (2.5 mA cm −2 ), Pd/C (1 mA cm −2 ), 33 or polycrystalline platinum (6 mA cm −2 ). 34 The predominant methanol and ethanol catalytic properties prove the efficiency of such hierarchical assembly of Pt nanoparticles into nanoflowers on graphene.…”

Section: Resultsmentioning

confidence: 77%

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

Zhang

Lopes

et al. 2016

J. Electrochem. Soc.

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Platinum (Pt) based electrocatalysts have electrochemical performance that outperforms many other noble metal and metal oxide based materials. Increasing performance allows a reduction in the platinum load, and thus reduce the cost of various devices such as fuel cells. A double pulse electrochemical approach was developed to nucleate and grow Pt nanoparticles into flower shaped assemblies on graphene sheets. The unique morphology and structure of the Pt were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM). The electrocatalytical activities of the Pt nanoflowers were evaluated using methanol and ethanol oxidation as model reactions. This proposed method has led to the synthesis of Pt nanoflowers with the ability to control, both their density and their size on defect free graphene. Alternative and renewable energy sources such as hydrogen and fuel cells provide a great opportunity to overcome the challenge of pollution and energy crises.1 However, cost, performance, and durability of these energy sources are major barrier for their wide-spread commercialization. It is the key driver behind the significant research on electrocatalysts that are used for various energy devices. Carbon supports, such as carbon black, Vulcan X and Ketjen Black, are generally used as supports for electrocatalysts for electrochemical applications. These electrodes using these carbon supports, however, present some important limitations such as inadequate corrosion resistance caused by electrochemical oxidation, structural deterioration, as well as the detachment of the active metal phase. Compared to carbon black, graphene, a two-dimensional carbon nanostructure, exhibits a higher corrosion resistance, high surface area and outstanding electronic, thermal, and mechanical properties; and is anticipated to be a promising replacement for conventional carbon supports.2-4 Recently we have developed an electrochemical exfoliation approach that reproducibly produced graphene at high yield and purity with the ability to modify graphene with polystyrene sulfonate to prevent re-stacking of the sheets. 5Making Pt-based electrocatalysts more-efficient is crucial as this directly leads to less precious metal usage, i.e. lower cost.6 Attempts to optimize the platinum utilization have occurred in parallel with the development of new ways to produce Pt nanostructures with smaller size and a better Pt dispersion on the support. 7 Several techniques have been explored in an attempt to produce efficient Pt electrocatalysts including chemical and physical methods such as chemical reduction [8][9][10] or sputter deposition techniques. 11-13 However, these techniques either lead to high metal loading with poor control of the size distribution or have proven difficult to scale up.9,14 Although great effort has been made toward the development of chimie douce production of shape-controlled Pt nanoparticles, hierarchical nanostructures with high specific surface area remain a challenge. 15 Additiona...

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Section: Resultsmentioning

confidence: 77%

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

Zhang

Lopes

et al. 2016

J. Electrochem. Soc.

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“…Two components alloying of Pd with other metals have been intensively studied, while the multi-alloying still needs to be put more attention, and the muli-alloying also provides vast variations in the choice and combination of different metals. Novel nanostructure of Pd is still a popular topic in this field [136][137][138][139][140][141]. …”

Section: Pd-based Catalysts For the Direct Ethanol Fuel Cells (Defcs)mentioning

confidence: 99%

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

2015

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This review selectively summarizes the latest developments in the Pd-based cataysts for low temperature proton exchange membrane fuel cells, especially in the application of formic acid oxidation, alcohol oxidation and oxygen reduction reaction. The advantages and shortcomings of the Pd-based catalysts for electrocatalysis are analyzed. The influence of the structure and morphology of the Pd materials on the performance of the Pd-based catalysts were described. Finally, the perspectives of future trends on Pd-based catalysts for different applications were considered.

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“…It has been reported that modifications of the Pd nanocatalyst by metals such as Ni [6][7][8], Au [9,10], Cu [10,11], Ag [10,12], Co [10,13 ] effectively improve the catalytic performances of the Pd nanocatalyst toward alcohol oxidations in alkaline media.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

Lović

Jović

2017

J. Electrochem. Sci. Eng.

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Hollow raspberry-like PdAg alloy nanospheres: High electrocatalytic activity for ethanol oxidation in alkaline media

Cited by 108 publications

References 35 publications

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

Electrically Bloomed Platinum Nanoflowers on Exfoliated Graphene: An Efficient Alcohol Oxidation Catalyst

Recent Development of Pd-Based Electrocatalysts for Proton Exchange Membrane Fuel Cells

Electrochemical behavior of electrodeposited Pd and PdNi coatings for the ethanol oxidation reaction in alkaline solution

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