“Painted” CNT@Au Nanoparticles: A Nanohybrid Electrocatalyst of Direct Methanol Oxidation

In a world of constant rush towards novel energy sources, hybrid nanomaterials have raised huge interest as their components can synergistically improve the expected performances in terms of power. In this regard, direct methanol oxidation (DMO) is among the most investigated reactions for implementation in portable and other devices. Herein, we report the design of gold-decorated CNT-aryl nanohybrids as electrocatalyst of DMO. In a first step, Azure A (AA), Neutral Red (NR) and Congo Red (CR) dye diazonium salts were reacted with CNTs to provide CNT-Dye nanoscale platforms for the immobilization of gold NPs. This step was conducted with CNT-Dye platforms evenly spread over glassy carbon (GC) electrodes. The CNT-Dye@Au nanohybrid electrode materials served for DMO electrocatalysis. Cyclic voltammograms show that bare CNT-Dye nanohybrids exhibit high electrocatalytic activity, particularly for the CNT-CR nanohybrid which returned a 3-fold improvement. With anchored Au NPs, a further 4 time remarkable increase in the oxidation peak intensity was achieved (i.e. about 12-fold the peak intensity recorded in the absence of any nanocatalyst). The forward to the backward anodic peak current density ratio Jf/Jb was found to be as high as is 1.68. This work provides a simple, elegant and efficient approach for designing robust, nanohybrid electrocatalyst for DMO, based on the smart combination of CNTs, diazotized dyes and gold NPs.

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“Painted” CNT@Au Nanoparticles: A Nanohybrid Electrocatalyst of Direct Methanol Oxidation

10.26434/chemrxiv.12739946 ◽

2020 ◽

Author(s):

Asma Bensghaïer ◽

Viplove Bhullar ◽

Navdeep Kaur ◽

Momath Lo ◽

Myriam Bdiri ◽

...

Keyword(s):

Methanol Oxidation ◽

Electrode Materials ◽

Density Ratio ◽

Neutral Red ◽

Cyclic Voltammograms ◽

Peak Current Density ◽

Peak Intensity ◽

Direct Methanol ◽

Anodic Peak Current ◽

Gold Nps

In a world of constant rush towards novel energy sources, hybrid nanomaterials have raised huge interest as their components can synergistically improve the expected performances in terms of power. In this regard, direct methanol oxidation (DMO) is among the most investigated reactions for implementation in portable and other devices. Herein, we report the design of gold-decorated CNT-aryl nanohybrids as electrocatalyst of DMO. In a first step, Azure A (AA), Neutral Red (NR) and Congo Red (CR) dye diazonium salts were reacted with CNTs to provide CNT-Dye nanoscale platforms for the immobilization of gold NPs. This step was conducted with CNT-Dye platforms evenly spread over glassy carbon (GC) electrodes. The CNT-Dye@Au nanohybrid electrode materials served for DMO electrocatalysis. Cyclic voltammograms show that bare CNT-Dye nanohybrids exhibit high electrocatalytic activity, particularly for the CNT-CR nanohybrid which returned a 3-fold improvement. With anchored Au NPs, a further 4 time remarkable increase in the oxidation peak intensity was achieved (i.e. about 12-fold the peak intensity recorded in the absence of any nanocatalyst). The forward to the backward anodic peak current density ratio Jf/Jb was found to be as high as is 1.68. This work provides a simple, elegant and efficient approach for designing robust, nanohybrid electrocatalyst for DMO, based on the smart combination of CNTs, diazotized dyes and gold NPs.

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Dye Diazonium-Modified Carbon Nanotubes with Immobilized Gold Nanoparticles as Nanohybrid Electrocatalyst of Direct Methanol Oxidation

10.26434/chemrxiv.12739946.v1 ◽

2020 ◽

Author(s):

Asma Bensghaïer ◽

Viplove Bhullar ◽

Navdeep Kaur ◽

Momath Lo ◽

Myriam Bdiri ◽

...

Keyword(s):

Methanol Oxidation ◽

Electrode Materials ◽

Density Ratio ◽

Neutral Red ◽

Cyclic Voltammograms ◽

Peak Current Density ◽

Peak Intensity ◽

Direct Methanol ◽

Gold Nps ◽

Modified Carbon Nanotubes

In a world of constant rush towards novel energy sources, hybrid nanomaterials have raised huge interest as their components can synergistically improve the expected performances in terms of power. In this regard, direct methanol oxidation (DMO) is among the most investigated reactions for implementation in portable and other devices. Herein, we report the design of gold-decorated CNT-aryl nanohybrids as electrocatalyst of DMO. In a first step, Azure A (AA), Neutral Red (NR) and Congo Red (CR) dye diazonium salts were reacted with CNTs to provide CNT-Dye nanoscale platforms for the immobilization of gold NPs. This step was conducted with CNT-Dye platforms evenly spread over glassy carbon (GC) electrodes. The CNT-Dye@Au nanohybrid electrode materials served for DMO electrocatalysis. Cyclic voltammograms show that bare CNT-Dye nanohybrids exhibit high electrocatalytic activity, particularly for the CNT-CR nanohybrid which returned a 3-fold improvement. With anchored Au NPs, a further 4 time remarkable increase in the oxidation peak intensity was achieved (i.e. about 12-fold the peak intensity recorded in the absence of any nanocatalyst). The forward to the backward anodic peak current density ratio Jf/Jb was found to be as high as is 1.68. This work provides a simple, elegant and efficient approach for designing robust, nanohybrid electrocatalyst for DMO, based on the smart combination of CNTs, diazotized dyes and gold NPs.

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PtRu-SiO2-TiO2/C Anode Electrocatalyst for Direct Methanol Fuel Cell

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.287-290.1369 ◽

2011 ◽

Vol 287-290 ◽

pp. 1369-1374 ◽

Cited By ~ 1

Author(s):

Jian Feng Ju ◽

Dong Hui Wu ◽

Yu Jun Shi

Keyword(s):

Fuel Cell ◽

Methanol Oxidation ◽

Direct Methanol Fuel Cell ◽

Nitrogen Adsorption ◽

Surface Characteristics ◽

Cyclic Voltammograms ◽

Oxidation Activity ◽

Transmission Electron ◽

Direct Methanol ◽

Methanol Fuel Cell

The PtRu-SiO2-TiO2/C anode electrocatalyst ( loading 10wt% PtRu ) of direct methanol fuel cell is prepared by the surface reductive deposition method, using Vulcan XC-72 carbon black coated with nanometer SiO2-TiO2 (SiO2-TiO2/C) as the isotopic carrier. The surface characteristics of nanometer SiO2-TiO2 is studied through nitrogen adsorption, which shows that it is of porous structure together with large surface area, that is benefit to enhance the activity of SiO2-TiO2 and the dispersion of PtRu nanoparticle on the carrier of SiO2-TiO2/C. X-ray diffraction( XRD ) and transmission electron microscopy( TEM ) are used to characterize the catalyst. The PtRu nanoparticle homodisperse in SiO2-TiO2/C carrier with diameter around 2.4 nm. Cyclic voltammograms and chronoamperograms are conducted to compare the electrochemical methanol oxidation activity of the PtRu-SiO2-TiO2/C catalyst with the commercial PuRu/C catalyst ( 20 wt% of PtRu ). The results show that PtRu-SiO2-TiO2/C has higher catalytic activity and anti-poisoning ability for methanol oxidation, the addition of porous SiO2-TiO2 can replace the PtRu to some extent, comparing with the commercial PuRu/C catalyst, not only the loading of PtRu has been cut down 50%, but also the electro-oxidizing activity of methanol improved. The electro-oxidizing mechanism is basically analyzed.

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Carboxylic Graphene-Supported Platinum and Platinum-Palladium Nanoparticles with High Electrocatalytic Activity for Methanol Oxidation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.320.670 ◽

2013 ◽

Vol 320 ◽

pp. 670-674 ◽

Cited By ~ 1

Author(s):

Qing Zhou ◽

Guang Can Wang ◽

Long Yang ◽

Yun Yang ◽

Yang Xu

Keyword(s):

Methanol Oxidation ◽

Electrocatalytic Activity ◽

Palladium Nanoparticles ◽

Direct Methanol Fuel Cells ◽

Pd Nanoparticles ◽

Catalyst Supports ◽

Peak Current Density ◽

Supported Platinum ◽

Direct Methanol ◽

Methanol Fuel Cells

Pt, Pd and Pt-Pd nanoparticles (NPs) were synthesized on carboxylic graphene (CGR) sheets. The nanocomposites were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectra (FTIR) and UVvis absorption spectroscopy. Their electrocatalytic activity for methanol oxidation was also investigated. The results showed the peak current density of methanol oxidation of Pt NPs-Graphite oxide (GO), Pd NPs-CGR, Pt NPs-CGR and Pt-Pd NPs-CGR is 12.2μA/cm2, 14.1μA/cm2, 15.1μA/cm2and 21.5μA/cm2respectively. The nanocomposite of CGR as catalyst supports and Pt-Pd NPs as catalyzers is promising for direct methanol fuel cells.

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Recent progress in development of efficient electrocatalyst for methanol oxidation reaction in direct methanol fuel cell

International Journal of Energy Research ◽

10.1002/er.6316 ◽

2020 ◽

Author(s):

Lubna Yaqoob ◽

Tayyaba Noor ◽

Naseem Iqbal

Keyword(s):

Fuel Cell ◽

Methanol Oxidation ◽

Direct Methanol Fuel Cell ◽

Oxidation Reaction ◽

Recent Progress ◽

Methanol Oxidation Reaction ◽

Direct Methanol ◽

Methanol Fuel Cell

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Well-Dispersed Pt Catalysts Supported on Porous Carbon Nanofibers for Improved Methanol Oxidation in Direct Methanol Fuel Cells

ECS Solid State Letters ◽

10.1149/2.0061407ssl ◽

2014 ◽

Vol 3 (7) ◽

pp. M29-M32 ◽

Cited By ~ 14

Author(s):

G.-H. An ◽

H.-J. Ahn

Keyword(s):

Fuel Cells ◽

Carbon Nanofibers ◽

Methanol Oxidation ◽

Porous Carbon ◽

Direct Methanol Fuel Cells ◽

Pt Catalysts ◽

Direct Methanol ◽

Methanol Fuel Cells

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Silver Nanoparticles Supported on Ordered Mesoporous Carbon for Formaldehyde Electrooxidation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.508 ◽

2011 ◽

Vol 110-116 ◽

pp. 508-513

Author(s):

Ling Bin Kong ◽

Ru Tao Wang ◽

Xiao Wei Wang ◽

Zhen Sheng Yang ◽

Yong Chun Luo ◽

...

Keyword(s):

Fuel Cells ◽

Mesoporous Carbon ◽

Chemical Reduction ◽

Chemical Properties ◽

Ordered Mesoporous Carbon ◽

Alkaline Solutions ◽

Cyclic Voltammograms ◽

Peak Current Density ◽

Ordered Mesoporous ◽

Physical And Chemical

Metal nanocatalysts, as the anodic materials, have become increasingly important in fuel cells due to their unique physical and chemical properties. Here we report the ordered mesoporous carbon (CMK-3) supported silver nanocatalysts have been prepared through the wet chemical reduction by using the reduction of formaldehyde. The electrochemical properties of the Ag/CMK-3 nanocatalysts for formaldehyde oxidation are studied by cyclic voltammograms (CV) and chronoamperometric curves (i-t) in alkaline aqueous solutions. The results show that the peak current density (from CV) of the Ag/CMK-3 electrode is 112 mA cm-2, above 2 times higher than that of Ag/XC-72 at the same Ag loading (14.15 μg cm-2). Furthermore, the i-t curves demonstrate that the Ag/CMK-3 nanocatalysts are efficient and stable electrocatalysts for anodic oxidation of formaldehyde in alkaline solutions. Our results indicate that the application potential of Ag/CMK-3 nanocatalysts with the improved electrocatalytic activity has far reaching effects on fuel cells and sensors.

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Electron transport in clay-modified electrodes: study of electron transfer between electrochemically oxidized tris (2,2′-bipyridyl) iron cations and clay structural iron(II) sites

Canadian Journal of Chemistry ◽

10.1139/v92-227 ◽

1992 ◽

Vol 70 (6) ◽

pp. 1833-1837 ◽

Cited By ~ 16

Author(s):

Yan Xiang ◽

Gilles Villemure

Keyword(s):

Electron Transfer ◽

Modified Electrodes ◽

Quantitative Relation ◽

Cyclic Voltammograms ◽

Slow Electron ◽

Cathodic Current ◽

Peak Current ◽

Scan Speed ◽

Anodic Peak Current ◽

Structural Iron

The cyclic voltammograms of tris (2,2′-bipyridyl) iron(II) ([Fe(bpy)3]2+) adsorbed in clay-modified electrodes made from a range of different smectites were recorded. In all cases, at low scan speed (1 mV/s), the initial anodic peak current was much larger than the initial cathodic peak current. Partial reduction of the clay structural iron further increased the initial anodic to cathodic current ratio, suggesting that the discrepancy between the charge transferred in the anodic and cathodic scans was due to a slow electron transfer between the clay structural Fe(II) and the oxidized bipyridyl cations. However, no clear quantitative relation was found between the measured FeO contents of the different clays and the observed excess anodic currents. In fact, of all the clays tested only one, montmorillonite SWy-1, contained enough Fe(II) for it to account for all of the excess anodic charge transferred in the initial scan.

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Bimetallic alloy and semiconductor support synergistic interaction effects for superior electrochemical catalysis

Nanoscale ◽

10.1039/c9nr09608f ◽

2020 ◽

Vol 12 (7) ◽

pp. 4719-4728 ◽

Cited By ~ 1

Author(s):

Yunshan Zheng ◽

Yan Zhai ◽

Maomao Tu ◽

Xinhua Huang ◽

Mingcong Shu ◽

...

Keyword(s):

Fuel Cells ◽

Methanol Oxidation ◽

Oxidation Reaction ◽

Direct Methanol Fuel Cells ◽

Methanol Oxidation Reaction ◽

Electrochemical Catalysis ◽

Anode Catalysts ◽

Bimetallic Alloy ◽

Direct Methanol ◽

Methanol Fuel Cells

The design and fabrication of economically viable anode catalysts for the methanol oxidation reaction (MOR) have been challenging issues in direct methanol fuel cells (DMFCs) over the decades.

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