Oxygen reduction reaction on (Pt–NbPO x )/MWCNTs electrodes prepared by microwave irradiation method

Jianshu, Huang; Zhang, Xiaogang; Luo, Jianmin; Sun, Jinhua; Yang, Wenjian

doi:10.1007/s10008-007-0368-3

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…Additionally, on the basis of eq 4c, the reaction rate constants ( k ) can be assessed in a quantitative fashion. Table lists the ORR rate constants at the different Fe x Pt 100- x /GC electrodes (at +0.32 V vs Ag/AgCl), which are all of the order of 10 -3 cm/s, very comparable to the values observed with other catalysts such as Pt−NbPO x supported on multiwalled carbon nanotubes, and quinone- 68 or anthraquinone-modified 69 GC electrodes. Additionally, it can be seen that the ORR rate constant increases with increasing Pt content in the Fe x Pt 100- x nanocatalysts with a drastic jump at x = 42, and at higher Pt contents, the increment becomes very small.…”

Section: Resultssupporting

confidence: 62%

Electrocatalytic Reduction of Oxygen by FePt Alloy Nanoparticles

et al. 2008

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Fe x Pt100- x nanoparticles of different compositions (x = 63, 58, 54, 42, 15, and 0) were prepared and loaded onto a glassy carbon (GC) electrode where their catalytic activities in the electroreduction of oxygen were examined and compared. Cyclic and rotating disk voltammetric studies of the resulting Fe x Pt100- x /GC electrodes showed that the catalytic activity for oxygen reduction exhibited a peak-shape dependence on the particle composition (x). Among the series of nanocatalysts under study, Fe42Pt58 particles showed the maximum activity for O2 reduction in terms of the reduction overpotential and current density. This was accounted for by the effects of the Fe content on the electronic structures of the Pt active sites and the resulting Pt−O interactions. Kinetic analyses showed that direct four-electron reduction of adsorbed oxygen occurred on these catalyst surfaces. Additionally, the rate constant of O2 reduction increased with increasing Pt content in the alloy particles; yet, at x ≤ 42, the rate constant exhibited only a very small increment. These studies suggest that the Fe42Pt58 particles might represent an optimal composition for oxygen reduction among the series of nanoparticle catalysts under the present study.

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Section: Resultssupporting

confidence: 62%

Electrocatalytic Reduction of Oxygen by FePt Alloy Nanoparticles

et al. 2008

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“…19,20 Although previous studies [21][22][23] have shown that Pt-alloy NPs can be synthesized on CNTs for ORR, detailed ORR activity analysis of Pt-alloy NPs on CNTs has not been reported. In this letter, we report a simple aqueous synthetic method for carboxylic acid-functionalized MWNTs (MWNT-COOH) supported Pt x Ni 1-x (Pt:Ni; 1:0, 4:1, 3:1 and 0.7:1) NPs (Pt x Ni 1-x NPs/MWNTs) via an electrostatic attraction as well as ORR activity dependence in term of composite ratios in the Pt x Ni 1-x alloy NPs (Fig.…”

mentioning

confidence: 96%

Oxygen Reduction Activity of PtxNi1-x Alloy Nanoparticles on Multiwall Carbon Nanotubes

Kim¹,

Lee²,

Carlton³

et al. 2011

Electrochem. Solid-State Lett.

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“…In a word, the small particle size and the homogeneous size distribution of Pt/C-W catalyst are ascribed to the rapid reduction of the metal salts and the formation of metallic nuclei in the mixture of EG solution facilitated by microwave irradiation. It is worth to note that most researchers used domestic microwaves to complete the heating in the polyol process [10,15,16], one major deficiency of which is that the temperature of the mixture of polyol solution, platinum salt and support, may vary with the volume of the mixture, irradiation time, the power of the oven, etc. In contrast to, we use an industrial microwave with an infrared thermometer sensor, by which the temperature of the mixture can be easily observed, and therefore a satisfactory control of the reduction temperature realized.…”

Section: Characterization Of Pt/c Catalystsmentioning

confidence: 99%

Microwave Polyol Synthesis of Pt/C Catalyst and its Application to Hydrolysis of Sodium Borohydride

Xu¹,

Wang²,

Dai³

et al. 2009

TOCATJ

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XC-72 carbon supported Pt catalyst was prepared by using a microwave heated ethylene glycol method and characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). For comparison, the same Pt/XC-72 catalyst was also prepared by conventional heated ethylene glycol method. TEM image showed that microwave synthesized Pt nanoparticles were uniformly dispersed on the surface of carbon and had a narrow size distribution. The average particle sizes of Pt nanoparticles synthesized with microwave irradiation and conventional heating method are 2.7 and 3.7 nm, respectively. The Pt/C catalysts exhibited four diffraction peaks that are indexed to the {1 1 1}, {2 0 0}, {2 2 0}, and {3 1 1} planes of Pt. Their catalytic performances were evaluated by hydrolysis of sodium borohydride. The microwave synthesized Pt/XC-72 catalyst exhibited higher catalytic activity than that synthesized with conventional heated ethylene glycol method.

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Oxygen reduction reaction on (Pt–NbPO x )/MWCNTs electrodes prepared by microwave irradiation method

Cited by 5 publications

References 40 publications

Electrocatalytic Reduction of Oxygen by FePt Alloy Nanoparticles

Electrocatalytic Reduction of Oxygen by FePt Alloy Nanoparticles

Oxygen Reduction Activity of PtxNi1-x Alloy Nanoparticles on Multiwall Carbon Nanotubes

Microwave Polyol Synthesis of Pt/C Catalyst and its Application to Hydrolysis of Sodium Borohydride

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