Ethanol electro-oxidation with Pt and Pt–Ru catalysts supported on carbon nanotubes

Wang, M.Y.; Chen, J.H.; Fan, Zhen; Tang, Hao; Deng, Guohong; He, Deliang; Kuang, Yafei

doi:10.1016/j.carbon.2004.07.018

Cited by 65 publications

(35 citation statements)

References 10 publications

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“…5; A, curve c). The shapes of curves are typical for the electrooxidation reactions of organic alcohols; specifically, there are two peaks in both forward and reverse scans as reported in the literature [56,[68][69][70]. Most likely, the first (least positive) anodic peak reflects primarily the oxidation of ethanol to CO 2 ; in a given scan, there may be some contribution to this current from incompletely oxidized carbonaceous species formed during the prior cycle.…”

Section: Resultsmentioning

confidence: 84%

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

Miecznikowski

2012

J Solid State Electrochem

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Electrocatalytic systems utilizing carbon (Vulcan)-supported PtRh nanoparticles (PtRh/Vulcan) admixed with either molybdenum oxide or tungsten oxide were tested and compared during electrooxidation of ethanol. The systems' performance was diagnosed using electrochemical techniques such as voltammetry and chronoamperometry. The proposed electrocatalytic materials were also characterized with X-ray diffraction (XRD), transmission and scanning electron microscopies (TEM and SEM), as well as SEM-coupled energy dispersive X-ray spectroscopy (SEM-EDX). For both systems containing molybdenum and tungsten oxides, enhancements in catalytic activities (relative to the behavior observed at bare PtRh/Vulcan nanoparticles) were found during ethanol electrooxidation at room temperature (22°C). Further, it was from chronoamperometric current (density)-time responses that anodic electrocatalytic currents measured at 0.3 V (vs. RHE) were more than 20% higher in the case of the MoO 3 -containing PtRh/Vulcan system relative to that utilizing WO 3 . The diagnostic "CO-stripping" experiments were consistent with the view that addition of molybdenum oxide or tungsten oxide to PtRh/Vulcan tended to shift potential for the oxidation of inhibiting CO-adsorbate ca. 80 or 40 mV towards less negative values in comparison to the analogous but oxide-free system. The fact that carbon (Vulcan)-supported PtRu nanoparticles exhibited higher electrocatalytic reactivity observed phenomena may be attributed to specific interactions between noble metal centers and the oxides in addition to chemical reactivity of metal oxo groups in the vicinity of PtRh/ Vulcan at the electrocatalytic interface.

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Section: Resultsmentioning

confidence: 84%

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

Miecznikowski

2012

J Solid State Electrochem

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“…On the other hand, although the full oxidation of ethanol to carbon dioxide has a favorable thermodynamic potential of 0.08 V (vs. RHE), the efficiency of direct ethanol fuel cells is already severally limited by the formation of partial oxidation products (containing an intact carbon-carbon bond) and strongly adsorbed intermediates. The great body of work developed in the last few years indicates that various Pt-based catalysts such as PtSn [11][12][13] or PtRu [14][15][16] display enhanced electrocatalytic performance for ethanol electrooxidation with respect to monometallic Pt catalyst. In both reactions, the use of oxophilic atoms can aid in the oxidation of CO from the surface as they enhance the activation of water to form surface hydroxides, which can more readily oxidize CO and CH x intermediates that form via bifunctional pathways [17,18].…”

Section: Introductionmentioning

confidence: 99%

Carbon-Supported PtRuMo Electrocatalysts for Direct Alcohol Fuel Cells

et al. 2013

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Abstract:The review article discusses the current status and recent findings of our investigations on the synthesis and characterization of carbon-supported PtRuMo electrocatalysts for direct alcohol fuel cells. In particular, the effect of the carbon support and the composition on the structure, stability and the activity of the PtRuMo nanoparticles for the electrooxidation of CO, methanol and ethanol have been studied. Different physicochemical techniques have been employed for the analysis of the catalysts structures: X-ray analytical methods (XRD, XPS, TXRF), thermogravimetry (TGA) and transmission electron microscopy (TEM), as well as a number of electrochemical techniques like CO adsorption studies, current-time curves and cyclic voltammetry measurements. Furthermore, spectroscopic methods adapted to the electrochemical systems for in situ studies, such as Fourier transform infrared spectroscopy (FTIRS) and differential electrochemical mass spectrometry (DEMS), have been used to evaluate the oxidation process of CO, methanol and ethanol over the carbon-supported PtRuMo electrocatalysts.

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“…However, for Pt-Ru/ CNT/graphite and Pt/CNT/graphite electrodes, only 72% and 55% values remained. 9 This implies that Pt-MoO x /CNT/graphite electrode is a kind of good electrode for ethanol electrooxidation, even superior to Pt-Ru/CNT/graphite electrode.…”

Section: Activation Energy Of Ethanol Electrooxidationmentioning

confidence: 98%

“…A catalyst system, which is able to break C-C bond and oxidize the poisoning intermediates (such as CO ads ) of ethanol oxidation at lower temperature and overpotentials, becomes the investigative focus in DEFC. Many Pt-based catalysts, such as Pt-Ru, [7][8][9] Pt-Sn, 10 Pt-Rh 11 and so on, have been studied to demonstrate the excellent electrocatalytic activity both for methanol and ethanol electrooxidation. Especially, the Pt-Ru binary metallic catalyst (Pt/Ru＝50/50) was commonly accepted as the best electrocatalyst for methanol oxidation.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Pt‐MoO_x/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation

Wang

Cui

2006

Chin. J. Chem.

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MoO x , a non-noble secondary catalyst instead of noble metal Ru, was dispersed on carbon nanotubes (CNT) and then the primary catalyst Pt was electrodeposited on MoO x /CNT/graphite electrode by potential-step method. CNT used was grown directly on graphite disk by chemical vapor deposition. The Pt-MoO x /CNT/graphite electrode was characterized by scanning electron microscopy and energy dispersive X-ray spectroscopy. The electrocatalytic property and the long-term cyclic stability of Pt-MoO x /CNT/graphite electrode for ethanol oxidation have been investigated in 1.0 mol/L CH 3 CH 2 OH＋0.1 mol/L H 2 SO 4 by cyclic voltammetry. On the other hand, the effect of the loading mass of MoO x on specific activity of Pt-MoO x /CNT/graphite electrode and the activation energy of ethanol oxidation were investigated. The Pt-MoO x /CNT/graphite electrode shows good long-term cyclic stability. 82% value of peak current density at the oxidation peak around 0.69 V (vs. SCE) remains after 500 cycles, which is higher than those of Pt/CNT/graphite and Pt-Ru/CNT/graphite electrodes with the corresponding values of 55% and 72%, respectively.

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Ethanol electro-oxidation with Pt and Pt–Ru catalysts supported on carbon nanotubes

Cited by 65 publications

References 10 publications

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

Carbon-Supported PtRuMo Electrocatalysts for Direct Alcohol Fuel Cells

Preparation of Pt‐MoO_x/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation

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Ethanol electro-oxidation with Pt and Pt–Ru catalysts supported on carbon nanotubes

Cited by 65 publications

References 10 publications

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

Enhancement of activity of PtRh nanoparticles towards oxidation of ethanol through modification with molybdenum oxide or tungsten oxide

Carbon-Supported PtRuMo Electrocatalysts for Direct Alcohol Fuel Cells

Preparation of Pt‐MoOx/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation

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Preparation of Pt‐MoO_x/CNT Electrode and Its Electrocatalytic Property for Ethanol Electrooxidation