Enhanced electrocatalytic activity of carbon-supported MnOx/Ru catalysts for methanol oxidation in fuel cells

Rebello, Jeanette S.; Samant, Purnakala; Figueiredo, José L.; Fernandes, Julio B.

doi:10.1016/j.jpowsour.2005.03.005

Cited by 45 publications

(23 citation statements)

References 13 publications

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“…These challenges stimulated efforts to develop a series of electrocatalysts to increase the efficiency of MOR in a DMFC. Although nonnoble metal catalysts have been investigated and used for MOR [7], platinum and its alloys are the only proven state-ofthe-art catalysts for use in MOR.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic properties of carbon supported cobalt phthalocyanine–platinum for methanol electro-oxidation

Reddy

2008

International Journal of Hydrogen Energy

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Section: Introductionmentioning

confidence: 99%

Electrocatalytic properties of carbon supported cobalt phthalocyanine–platinum for methanol electro-oxidation

Reddy

2008

International Journal of Hydrogen Energy

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“…Another phenomenon that could contribute to the improvement of the catalytic activity involves the previously mentioned hydrogen intercalation/de‐intercalation process into Mn 3 O 4 lattice. Hence, the methanol dehydrogenation process is catalyzed by Mn 2+ /Mn 3+ redox couple via the evolution of protons and electrons ,. Therefore, the utilization of such hybrid support could lead to increase the reaction rate …”

Section: Resultsmentioning

confidence: 99%

“…Hence, the methanol dehydrogenation process is catalyzed by Mn 2 + /Mn 3 + redox couple via the evolution of protons and electrons. [36,37] Therefore, the utilization of such hybrid support could lead to increase the reaction rate. [26] Furthermore, the more homogeneous spatial distribution of nanoparticles with the rise in oxide content also contributes to the enhancement of methanol electrooxidation.…”

Section: Resultsmentioning

confidence: 99%

Manganese (II,III) Oxide‐Activated Carbon Black Supported PtRu Nanoparticles for Methanol Electrooxidation in Acid Medium

et al. 2018

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In this work, PtRu nanoparticles supported on hybrid manganese (II,III)‐carbon composites were prepared by a microwave‐assisted polyol process in ethylene glycol. The obtained PtRu/(100‐x) C.xMn3O4 catalysts were characterized by XRD diffraction, TEM, SEM‐EDX analysis, ICP‐AES and electrochemical techniques. Small and well‐distributed nanoparticles of about 2.6 nm were obtained over the hybrid support. The as‐prepared catalysts presented similar Pt : Ru atomic ratio (ca. 3.4 : 1), indicating that the composition of the bimetallic system is unaffected by the oxide content in the hybrid support. However, the noble metal loading increased with the increase in the oxide content due to the formation of more nucleation sites during microwave heating. The electrochemical experiments showed that the best performance and the lowest poisoning rate are obtained with PtRu/90C.10Mn3O4 followed by PtRu/70C.30Mn3O4. The bimetallic catalyst supported over 90C.10Mn3O4 exhibited a steady current density of 215 mA mgPtRu−1 at 0.5 V, which is 40 % higher than that of PtRu/C. This behavior is mainly associated with the ability of Mn3O4 to provide a large extra amount of hydroxyl groups and promote the dehydrogenation of methanol.

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“…In this context, several bimetallic and metal oxidemodified Pt-based electrocatalysts have been suggested with an aim to mitigate such poisoning effects [2,[4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic Oxidation of CO at Pt Modified with Manganese Oxide Nanorods

2011

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CO oxidation at Pt anodes modified with manganese oxide nanorods (nano-MnO x /Pt) has been studied by cyclic and linear sweep voltammetry. Both CO adlayer stripping and oxidation of bulk CO are enhanced by nano-MnO x as compared to unmodified Pt electrodes. This is manifested by a negative shift of approximately 200 mV in the peak potential of CO adlayer stripping at the modified compared to the unmodified Pt surface. This enhancement is attributed to the catalytic mediation of manganese oxide nanorods (electrodeposited in a γ-MnOOH single crystalline phase), which supplies oxygen species at relatively low anodic potentials and thus facilitates the oxidation of CO to CO 2 . This finding sheds new light on the formic acid oxidation in the presence of MnO x , as the latter can remove CO efficiently from the Pt surface, and hence, prevents its de-activation.A polycrystalline Pt wire is the working electrode (d= 2.0 mm, sealed in a Teflon jacket leaving an exposed

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Enhanced electrocatalytic activity of carbon-supported MnOx/Ru catalysts for methanol oxidation in fuel cells

Cited by 45 publications

References 13 publications

Electrocatalytic properties of carbon supported cobalt phthalocyanine–platinum for methanol electro-oxidation

Electrocatalytic properties of carbon supported cobalt phthalocyanine–platinum for methanol electro-oxidation

Manganese (II,III) Oxide‐Activated Carbon Black Supported PtRu Nanoparticles for Methanol Electrooxidation in Acid Medium

Electrocatalytic Oxidation of CO at Pt Modified with Manganese Oxide Nanorods

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