The influence of copper in dealloyed binary platinum–copper electrocatalysts on methanol electroxidation catalytic activities

Poochai, Chatwarin; Veerasai, Waret; Somsook, Ekasith; Dangtip, S.

doi:10.1016/j.matchemphys.2015.07.046

Cited by 15 publications

(8 citation statements)

References 56 publications

(66 reference statements)

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“…Herein, the obtained PtCo nanoparticles is a porous network-like structure, which is different from the dense particles of the reported network-like structures [3][4][5][6][7][8][9][10][11][12][13]. In this work, the precursor PtCo particles is a cotton-like alloy, which is different from the dense solid alloy particles used in the previous reports [14][15][16][17][18][19]. Therefore, the restriction on the sizes of the alloy nanoparticle precursor is broken.…”

Section: Introductionmentioning

confidence: 78%

“…However, the prohibitive cost of platinum, accounting for over 55% of the total cost of low temperature fuel cell systems, the poor durability and the scarcity in supply largely hindered their large-scale practical applications and market deployment [1]. Therefore, alloy nanoparticle precursor, has often been reported and found to be an effective method to enhance the electrocatalytic activity [14][15][16][17][18][19]. This implies that the catalytic activity of the network-like electrocatalysts can be improved by forming porosity within the nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction

Ding

Wang

et al. 2017

Electrochimica Acta

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It has been recently reported that engineering the pores within alloy nanoparticles leads to improvement in the electrochemical activity of nanoparticle catalysts due to the enhanced electrochemical active surface areas. However, to date, few works have reported the tailoring intraporosity within alloy nanoparticle networks.In this study, a different and innovative approach was adopted to yield a network-like PtCo catalyst composed of intraporous nanoparticles used a cotton-like PtCo precursor material. It was found that the network-like structure and intrapores within the nanoparticles could co-evolve after careful controlled electrochemical dealloying, whereby Pt-rich surface was formed during the leaching out of Co in the first 13 th potentiostatic cyclic voltammetry cycles from +0.056 to +1.256 V vs. RHE.Electrochemical data also showed that the mass and area activity of the obtained PtCo networks toward methanol oxidation reaction (MOR) was nearly 3.9, 2.0 and 2.1 times higher than that of commercial Pt/C, PtRu/C catalyst respectively, and much higher than that of Pt3Co networks made of only solid nanoparticles. Moreover, it was observed that such networks exhibited high CO oxidation ability whilst maintaining high catalytic durability under an applied potential of +0.756 V vs. RHE. It was found that developing network-like catalysts composed of porous nanoparticles can be an efficient strategy to improve the catalytic activity and durability of fuel cell catalysts.

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Section: Introductionmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction

Ding

Wang

et al. 2017

Electrochimica Acta

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“…This can be ascribed to an expansion in OH ad sites at the higher potential which oxidizes the adsorbed intermediates, along these lines authorizing the metal destinations to facilitate oxidation [64]. From the Nyquist plots, ethanol and methanol oxidation is typically denoted by frequency inductive circle with a diameter representing charge transfer resistance (R ct ) [65,66]. In Figure 10(a) and 10(b), the radius of the arc reflects the charge transfer resistance (R ct ) between the surface of the electrode and the electrolyte when ethanol and methanol is oxidized on the surface of the electrode.…”

Section: Electrochemical Impedance Study (Eis)mentioning

confidence: 99%

Electro‐oxidation of Ethanol and Methanol on Pd/C, Pd/CNFs and Pd−Ru/CNFs Nanocatalysts in Alkaline Direct Alcohol Fuel Cell

et al. 2020

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Pd/C, Pd/CNFs and PdÀ Ru/CNFs nanocomposite materials were utilized as anode nanocatalysts in lowtemperature alkaline direct alcohol fuel cells. The palladium based nanocatalysts performance and stability were firmly relying upon the attributes of the carbon nanofibers (CNFs). CNFs were successfully synthesized employing a chemical vapour deposition method. The nanocatalysts were synthesized by dispersing Pd and PdÀ Ru nanoparticles onto the CNFs surface using alcohol reduction method. The physical properties of the synthesized nanocatalysts were explored utilizing several techniques such as transmission electron microscope (TEM), scanning electron microscope-Energy dispersive x-ray (SEM-EDX), X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS) and Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) and confirmed successful synthesis of Pd/C, Pd/ CNFs and PdÀ Ru/CNFs nanocomposite. TEM showed that Pd and Ru nanoparticles were uniformly dispersed on the CNFs support surface. ICP-OES determined the palladium and ruthenium concentration in Pd/C, Pd/CNFs and PdÀ Ru/CNFs nanocatalysts to be Pd (7.67 %), Pd (7.74 %), Pd (7.82 %) and Ru (3.22 %) respectively. The three prepared nanocatalysts were evaluated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) in the evaluation of ethanol and methanol oxidation reactions. CV, CA and EIS experiments of PdÀ Ru/CNFs nanocatalyst displayed superior activity towards alcohol oxidation reaction in alkaline conditions than Pd/CNFs and commercial Pd/C nanocatalysts.

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“…Great efforts have been made to enhance the stability; some compositions are easy to dissolve from the reaction interface of the alloy catalyst. 21 − 25 …”

Section: Introductionmentioning

confidence: 99%

“…But, it will lose active sites during working, which results from poisoning of intermediate species during anode reaction process in DMFCs. − To overcome this problem, various metal elements, such as Pd, Ni, and others were used for incorporation into platinum to prepare alloy catalysts. − It not only reduces the amount of platinum but also improves the ability of CO tolerance via a bifunctional mechanism. − Unfortunately, many alloy catalysts are not stable at the inclement circumstance in DMFCs. Great efforts have been made to enhance the stability; some compositions are easy to dissolve from the reaction interface of the alloy catalyst. − …”

Section: Introductionmentioning

confidence: 99%

Pt Nanoparticles Loaded on W₁₈O₄₉ Nanocables–rGO Nanocomposite as a Highly Active and Durable Catalyst for Methanol Electro-Oxidation

Wang

et al. 2018

ACS Omega

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Highly active and durable electrocatalysts are vital for commercialization of direct methanol fuel cells. In this work, a three-dimensional nanocomposite consisting of platinum nanoparticles, W18O49 nanocables, and reduced graphene oxide composite (Pt/W18O49 NCs–rGO) has been prepared as an electrocatalyst for methanol oxidation reaction (MOR). The catalyst is prepared through a two-step method. The W18O49 nanocables and the reduced graphene oxide composite are prepared by a solvothermal process. Then, Pt nanoparticles are loaded on the W18O49 nanocables and the reduced graphene oxide composite by a hydrogen reduction at ambient condition. The obtained catalyst has a special three-dimensional architecture consisting of two-dimensional nanosheets, assembled one-dimensional nanocables, and the loaded nanoparticles on their surface. The Pt/W18O49 NCs–rGO catalyst shows 1.56 time mass activities than the Pt/C, with the current density of the forward anodic peak reaching 1624 mA/mgPt at 0.854 V versus reversible hydrogen electrode potential in 0.1 M HClO4 and 0.5 M CH3OH mixed electrolyte. It also shows a strong antipoisoning property toward CO. For the durability testing, the current density of Pt/W18O49 NCs–rGO shows a 37% decay, whereas the current of Pt/C catalyst shows a 41% degradation from 600 to 3600 s at 0.7 V. The high activity toward MOR, good antipoisoning for intermediate products, and excellent stability are ascribed to strong metal–support interaction effects between the Pt nanoparticles and the W18O49 NCs.

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The influence of copper in dealloyed binary platinum–copper electrocatalysts on methanol electroxidation catalytic activities

Cited by 15 publications

References 56 publications

Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction

Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction

Electro‐oxidation of Ethanol and Methanol on Pd/C, Pd/CNFs and Pd−Ru/CNFs Nanocatalysts in Alkaline Direct Alcohol Fuel Cell

Pt Nanoparticles Loaded on W₁₈O₄₉ Nanocables–rGO Nanocomposite as a Highly Active and Durable Catalyst for Methanol Electro-Oxidation

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The influence of copper in dealloyed binary platinum–copper electrocatalysts on methanol electroxidation catalytic activities

Cited by 15 publications

References 56 publications

Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction

Tailoring nanopores within nanoparticles of PtCo networks as catalysts for methanol oxidation reaction

Electro‐oxidation of Ethanol and Methanol on Pd/C, Pd/CNFs and Pd−Ru/CNFs Nanocatalysts in Alkaline Direct Alcohol Fuel Cell

Pt Nanoparticles Loaded on W18O49 Nanocables–rGO Nanocomposite as a Highly Active and Durable Catalyst for Methanol Electro-Oxidation

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Pt Nanoparticles Loaded on W₁₈O₄₉ Nanocables–rGO Nanocomposite as a Highly Active and Durable Catalyst for Methanol Electro-Oxidation