Pt–MoOx-carbon nanotube redox couple based electrocatalyst as a potential partner with polybenzimidazole membrane for high temperature Polymer Electrolyte Membrane Fuel Cell applications

Vellacheri, Ranjith; Unni, Sreekuttan M.; Nahire, Sandip B.; Kharul, Ulhas K.; Kurungot, Sreekumar

doi:10.1016/j.electacta.2010.01.012

Cited by 41 publications

(38 citation statements)

References 37 publications

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“…These factors modify the adsorption strength of the adsorbed species and can influence the methanol electro-oxidation. In this study the magnitude of the current resulting from the redox peaks is significantly large for Pt-MoO 3 (2:2)/C electrode compared to earlier reports, [17,18,20] which may be due to higher surface redox reactivity. This surface redox activity has been elusive in some of the earlier studies on noble metal incorporated MoO 3 [19,[21][22][23].…”

Section: Methanol Oxidation On Moo 3 Promoted Pt/c Electrocatalystcontrasting

confidence: 54%

“…Among metal oxides, different forms of molybdates have been extensively studied for their promoting action on electro-oxidation of methanol in acidic media [17][18][19][20][21][22][23]. In the present work, the MoO 3 /C composites have been prepared by a simple intermittent microwave heating (IMH) method and Pt nanoparticles are dispersed over MoO 3 /C composites by a microwave-assisted polyol process.…”

Section: Methanol Oxidation On Moo 3 Promoted Pt/c Electrocatalystmentioning

confidence: 99%

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Metal Oxide Promoted Electrocatalysts for Methanol Oxidation

2011

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An important research target in DMFCs is to find better catalyst materials that are cheaper, less-prone to poisoning and more catalytically active. In this context, metal oxides with good catalytic properties and stronger interaction with Pt nanoparticles can generate active interfacial regions for electrocatalysis. Pt catalysts promoted by certain metal oxides show enhanced methanol electro-oxidation activity and CO tolerance behavior. In this paper we summarize the recent progress from our laboratory which explored the possibility of developing Pt-MoO 3 /C and Pt-Nb 2 O 5 /C electrocatalysts in acidic media, and Pt-V 2 O 5 /C electrocatalyst in alkaline media for direct electro-oxidation of methanol. The oxide electrocatalysts have been prepared by a fast and efficient method of loading the metal oxide on carbon black (Vulcan XC-72) employing an intermittent microwave heating (IMH) method. These materials are found to achieve higher activity and stability towards methanol electro-oxidation.

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Section: Methanol Oxidation On Moo 3 Promoted Pt/c Electrocatalystcontrasting

confidence: 54%

Section: Methanol Oxidation On Moo 3 Promoted Pt/c Electrocatalystmentioning

confidence: 99%

Metal Oxide Promoted Electrocatalysts for Methanol Oxidation

2011

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“…The lower ECSA of the Pt/Mo 2 C nanotubes relative to the commercial Pt/C and PtRu/C catalysts may originate in part from the MoO x layer on the surface of Mo 2 C nanotubes (formed during the preparation process of the Mo 2 C nanotubes), as evidenced by electron energy loss spectroscopy analysis (Supplementary Figure S2c). On the one hand, this MoO x layer was enhanced by the ALD process, which could have further decreased the ECSA of Pt/Mo 2 C. 35 On the other hand, the MoO x layer on the surface of Mo 2 C nanotubes favors the adsorption of OH in solution and acts as a nanostructured OH reservoir for the MOR; thus, it is able to remarkably enhance the catalytic activity. It is worthwhile to note that the benefit from MoO x is observed only when the amount of MoO x is properly maintained so that the Pt-MoO x interface is formed without causing a significant reduction in the ECSA of Pt.…”

Section: Electrochemical Performancementioning

confidence: 99%

“…It is worthwhile to note that the benefit from MoO x is observed only when the amount of MoO x is properly maintained so that the Pt-MoO x interface is formed without causing a significant reduction in the ECSA of Pt. 35 We first examined the catalytic activities of the ALD Pt/Mo 2 C nanotube catalysts with different Pt deposition cycles, as shown in Supplementary Figure S6. The CVs of the electrodes with different catalyst materials were tested in 0.5 M H 2 SO 4 and 0.5 M CH 3 OH solutions and the current densities were normalized to the ECSA of Pt.…”

Section: Electrochemical Performancementioning

confidence: 99%

A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

Zhang

Yang

et al. 2015

NPG Asia Mater

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Poor electrocatalytic activity and carbon monoxide (CO) poisoning of the anode in Pt-based catalysts are still two major challenges facing direct methanol fuel cells. Herein, we demonstrate a highly active and stable Pt nanoparticle/Mo 2 C nanotube catalyst for methanol electro-oxidation. Pt nanoparticles were deposited on Mo 2 C nanotubes using a controllable atomic layer deposition (ALD) technique. This catalyst showed much higher catalytic activity for methanol oxidation and superior CO tolerance, when compared with those of the conventional Pt/C and PtRu/C catalysts. The experimental evidence from X-ray absorption near-edge structure spectroscopy and scanning transmission X-ray microscopy clearly support a strong chemical interaction between the Pt nanoparticles and Mo 2 C nanotubes. Our studies show that the existence of Mo 2 C not only minimizes the required Pt usage but also significantly enhances CO tolerance and thus improves their durability. These results provide a promising strategy for the design of highly active next-generation catalysts.

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“…The favorable shifts in the open circuit, half wave potential and limiting current regions equivalent to the electrode of PtCeO2/C can be attributed to the enhanced ORR activity. It was found that the difference in the limiting currents for the two electrocatalysts may be due to the difference of oxygen diffusion at both of them [72]. It is also found thatPt-CeO 2 /C (8.84 Ce%) had higher onset potential and limiting current than Pt-CeO 2 /C-1 (6.40 Ce%) which is in accordance with Kang et al [73] Oxygen reduction mechanism of Pt-CeO2/C and Pt-CeO 2 /C-1 has been evaluated using the Koutecky-Levichequation to determine the number of electrons transferred per O 2 molecule.…”

Section: Study Of Oxygen Reduction With Rdementioning

confidence: 99%

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

El–Khatib¹,

Fetohi

Amin

et al. 2017

Egypt. J. Chem.

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Pt-MOx/C (M = Ti, Ce or Zr) electrocatalysts was prepared for the purpose of developing a cheap and efficient electrocatalysts for oxygen reduction reaction (ORR) using a mixture of ethylene glycol and sodium borohydride (EG + NaBH 4 ) as areducing agent. Pt/C was studied for estimation of metal oxides effect.Pt-CeO 2 /C-1 was prepared through single reducing agent ethylene glycol for studying the effect of changing the reducing agent on the activity of electrocatalysts toward ORR and for studying ORR kinetics. The electrocatalytic activity of the prepared electrocatalysts towards (ORR) was evaluated by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) on a rotating disc electrode (RDE). Pt-ZrO 2 /C shows the best activity towards ORR among the studied electrocatalysts; the oxygen reduction current density for it is about 5 times; (5.84 mAcm -2 ) as that of Pt/C (1.26 mAcm -2 ). Pt-CeO 2 /C showed better ORR activity (2.24 mAcm -2 ) than Pt-CeO 2 /C-1(1.58 mAcm -2 ) indicating the great effect of changing the reducing agent not only on the electrocatalyst behavior towards ORR but also its particle size and the metal content of the resultant electrocatalysts. Oxygen reduction mechanism for Pt-CeO 2 /C and Pt-CeO 2 /C-1 was evaluated using through KouteckyLevich, they showed first-order kinetics with ORR not controlled solely by diffusion. XRD, EDX and TEM analyses were used to characterize the prepared electrocatalyst.

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Pt–MoOx-carbon nanotube redox couple based electrocatalyst as a potential partner with polybenzimidazole membrane for high temperature Polymer Electrolyte Membrane Fuel Cell applications

Cited by 41 publications

References 37 publications

Metal Oxide Promoted Electrocatalysts for Methanol Oxidation

Metal Oxide Promoted Electrocatalysts for Methanol Oxidation

A highly active, stable and synergistic Pt nanoparticles/Mo2C nanotube catalyst for methanol electro-oxidation

Preparation and Characterization of Nano Structured Pt−MOx/C for Oxygen Reduction Reaction in Acidic Medium

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