Ultra-low loading Pt decorated coral-like Pd nanochain networks with enhanced activity and stability towards formic acid electrooxidation

Lan, Fei; Wang, Deli; Lu, Shanfu; Zhang, Jin; Liang, Dawei; Peng, Sikan; Liu, Yanyan; Xiang, Yan

doi:10.1039/c2ta00458e

Cited by 48 publications

(34 citation statements)

References 43 publications

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“…In addition, protonated carbonyl groups provided PVP with abundant positive charges, and the electrostatic repulsion effect can disperse the as-synthesized irregular PdAg particles. The PVP polymer chains connected to each other easily to form the nanochain-structure PdAg catalyst [23].…”

Section: Resultsmentioning

confidence: 99%

Hydrothermal Method Using DMF as a Reducing Agent for the Fabrication of PdAg Nanochain Catalysts towards Ethanol Electrooxidation

et al. 2016

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Abstract:In this article, we developed a facile one-step hydrothermal method using dimethyl formamide (DMF) as a reducing agent for the fabrication of PdAg catalyst. The scanning electron microscope (SEM) and transmission electron microscopy (TEM) images have shown that the as-synthesized PdAg catalyst had a nanochain structure. The energy-dispersive X-ray analyzer (EDX) spectrum presented the actual molar ratio of Pd and Ag in the PdAg alloy. Traditional electrochemical measurements, such as cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectrometry (EIS), were performed using a CHI 760D electrochemical analyzer to characterize the electrochemical properties of the as-synthesized catalyst. The results have shown that the PdAg catalyst with a nanochain structure displays higher catalytic activity and stability than pure Pd and commercial Pd/C catalysts.

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Section: Resultsmentioning

confidence: 99%

Hydrothermal Method Using DMF as a Reducing Agent for the Fabrication of PdAg Nanochain Catalysts towards Ethanol Electrooxidation

et al. 2016

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“…In order to achieve high current density and durability, Pd-based bimetallic nanocatalysts and adatom modified Pd catalysts have been used. [13][14][15][16][17][18][19] The electrocatalytic performance of these catalysts depends on the crystallographic orientation, composition, size and shape of the particles. [15][16][17] 950 Sourov Ghosh and C Retna Raj Among the various nanoscale bimetallic nanocatalysts, Pt-Pd is demonstrated to have high electrocatalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Pt-Pd nanoelectrocatalyst of ultralow Pt content for the oxidation of formic acid: Towards tuning the reaction pathway

Ghosh

Raj

2015

J Chem Sci

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Synthesis of highly efficient functional electrocatalyst that favours the electrochemical oxidation of formic acid via CO-free dehydrogenation pathway is required for direct formic acid fuel cells. Traditional catalysts favour the dehydration pathway involving the generation of poisonous CO. Herein we demonstrate the superior electrocatalytic performance of Pt-Pd bimetallic nanoelectrocatalyst of ultralow Pt content and tuning the reaction pathway by controlling the Pt content. Bimetallic nanoparticles of Pt 4 Pd 96 , Pt 7 Pd 93 and Pt 47 Pd 53 compositions are synthesized by electrochemical co-deposition method in aqueous solution. The nanoparticles of ultralow Pt content, Pt 4 Pd 96 , favour the CO-free dehydrogenation pathway for formic acid oxidation with an onset potential of 0 V (SHE) whereas the Pt 47 Pd 53 nanoparticles favour the dehydration pathway involving the formation of CO at high positive potential. The Pt content of the bimetallic nanoparticles actually controls the oxidation peak potential and catalytic activity. Significant negative shift (∼350 mV) in the oxidation peak potential and remarkable enhancement in the current density (2.6 times) are observed for Pt 4 Pd 96 nanoparticles with respect to Pt 47 Pd 53 . The absence of three adjacent Pt and Pd atoms could be the reason for the suppression of CO pathway. The electrochemical impedance measurements indirectly support the CO-free pathway for the formic acid oxidation on Pt 4 Pd 96 nanoparticles.

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“…One of the great challenges in the research and development of PEFCs is the development of alternatives to Pt, catalysts known to produce high power density at room temperature [1][2][3], due to the limitations in the resources of platinum, but also because of its high susceptibility to poisoning by CO which is formed during the fuel oxidation or is present as impurities in the fuels. In effort to overcome these problems, many Pt-based binary alloys have been investigated in terms of their oxidation onset potential as well as current density and their tolerance to CO [4][5][6][7][8][9]. In general, these bimetallic catalysts exhibit improved properties regarding electrocatalytic activity for the oxidation of formic acid and poisoning by CO but their stability depend on the leaching of less noble metal [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation

Lović

Stevanović

Tripković

et al. 2015

J Solid State Electrochem

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Formic acid oxidation was examined on platinumbismuth deposits on glassy carbon substrate prepared by twostep process, i.e., electrochemical deposition of Bi followed by electrochemical deposition of Pt as described in our previous article (J Electrochem Soc 161:H547-H554, 2014). Upon treatment of as-prepared clusters by slow anodic sweep, bimetallic structure consisting of Bi core occluded by Pt and Bi-oxide was obtained and exhibited significant activity and exceptional stability in HCOOH oxidation. In order to explain such electrocatalytic stability, in this work, the electrochemical properties of Pt@Bi/GC catalyst were investigated applying same protocols in supporting electrolyte with or without HCOOH and compared with Pt/GC. The protocols comprised potentiodynamic, quasisteady-state, and chronoamperometric measurements combined with the surface characterization by CO ads stripping voltammetry. Application of potential cycling at Pt@Bi/GC electrode in supporting electrolyte containing HCOOH leads to minor change in surface morphology, mildly leaching of Bi from the electrode surface, and negligible decrease in activity. On the other hand, significant Bi dissolution and considerable decrease in activity are the effects of the same treatment without HCOOH. Contrary to Pt@Bi/GC, Pt/GC electrodes subjected to the same protocols exhibit completely opposite properties being more stabile during potential cycling without HCOOH than in the presence of this acid. Exceptional stability in formic acid oxidation of Pt@Bi/GC catalyst is thus most probably the result of the combination of predominant dehydrogenation path of the reaction, suppressed Bi leaching, and compensation of dissolved Bi from the core as its source due to which surface morphology endured minor changes.

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Ultra-low loading Pt decorated coral-like Pd nanochain networks with enhanced activity and stability towards formic acid electrooxidation

Cited by 48 publications

References 43 publications

Hydrothermal Method Using DMF as a Reducing Agent for the Fabrication of PdAg Nanochain Catalysts towards Ethanol Electrooxidation

Hydrothermal Method Using DMF as a Reducing Agent for the Fabrication of PdAg Nanochain Catalysts towards Ethanol Electrooxidation

Pt-Pd nanoelectrocatalyst of ultralow Pt content for the oxidation of formic acid: Towards tuning the reaction pathway

Insight into electrocatalytic stability of low loading Pt-Bi/GC and Pt/GC clusters in formic acid oxidation

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