Investigation of Graphene Supported Platinum-Cobalt Nanocomposites as Electrocatalysts for Ethanol Oxidation

Kepenienė, Virginija; Tamašauskaitė–Tamašiūnaitė, Loreta; Jablonskienė, Jolita; Vaičiūnienė, Jūratė; Kondrotas, Rokas; Juškėnas, Remigijus; Norkus, Eugenijus

doi:10.1149/2.0511414jes

Cited by 12 publications

(8 citation statements)

References 51 publications

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“…Metal nanoparticle surface modification of carbon substrates constitute common catalysts and have a plethora of benefits [1][2][3][4][5] . Of note are the increase of the oxidation efficiency of alkaline electrolytes compared to the non-functionalised catalyst, the oxidative removal of some poisons and consequently more tolerance as well as the durability of electrocatalyst.…”

Section: Introductionmentioning

confidence: 99%

Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation

Mavrokefalos

Hasan

Khunsin

et al. 2017

Electrochimica Acta

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The modification of hydrogen terminated boron-doped diamond (HBDD) electrode with pure palladium (Pd) and Pd-Sn (tin) nanoparticles is described in this study. For synthesis of Sn/HBDD and Pd-Sn/HBDD electrode, a potentiostatic two-step electrochemical method involving the electrodeposition of Sn followed by Pd was used, respectively. The modification of the HBDD electrode with Sn and noble metal Pd by forming bimetallic Pd-Sn nanoparticle leads to a higher electrocatalytic activity. The electrocatalytic activity of the bimetallic Pd-Sn nanoparticles was evaluated towards the electrooxidation of ethanol in alkaline media and compared with that of the Pd nanoparticles alone. The bimetallic Pd-Sn nanoparticles modified HBDD electrode exhibits higher current densities and less poisoning effects during ethanol electrooxidation compared to Pd/HBDD. The proper tuning of the Pd loading on a foreign metal along with the surface termination effects of the BDD electrode plays a crucial role in achieving a high mass (4.26×106mA/g) and specific (12.37mA/cm2) electrocatalytic activity of Pd towards ethanol electrooxidation. The aforementioned catalysts of this research possess a high poisoning resistance (If/Ib=1.63) and stability towards ethanol electrooxidation in alkaline media

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Section: Introductionmentioning

confidence: 99%

Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation

Mavrokefalos

Hasan

Khunsin

et al. 2017

Electrochimica Acta

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“…So far, various Pt-based binary catalysts have been reported to improve the EOR activity [4][5][6][7][8], and PtSn alloy and Pt/SnO x catalysts were the best anode catalysts for EOR [9][10][11][12][13]. In these catalysts, Pt facilitates the adsorption and dissociation of ethanol, while Sn provides OH species for the oxidation of poisoning intermediates such as CH x and CO on Pt [12], which is known as a bi-functional effect.…”

Section: Introductionmentioning

confidence: 99%

Ethanol Oxidation Reaction on Tandem Pt/Rh/SnOx Catalyst

et al. 2017

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Abstract:To elucidate the atomic arrangement of a Pt-Rh-Sn ternary catalyst with a high catalytic activity for ethanol oxidation reaction (EOR) and high CO 2 selectivity, we prepared a tandem Pt/Rh/SnO x , in which a Rh adlayer was deposited on a Pt substrate (Rh coverage: 0.28), followed by depositing several layers of SnO x only on the Rh surface (Sn coverage: 0.07). For reference, Sn was randomly deposited on the Rh-modified Pt (Pt/Rh) electrode whose Rh and Sn coverages were 0.22 and 0.36 (random Pt/Rh/SnO x ). X-ray photoelectron spectroscopy demonstrated that Pt and Rh were metallic, and Sn was largely oxidized. Both Pt/Rh/SnO x electrodes were less positive in onset potential of EOR current density and higher in EOR current density than Pt and Rh/Pt electrodes. In situ infrared reflection-absorption spectroscopy demonstrated that the tandem Pt/Rh/SnO x electrode did not produce acetic acid, but produced CO 2 in contrast to the random Pt/Rh/SnO x , suggesting that a tandem arrangement of Pt, Rh and SnO x , in which the Pt and SnO x sites were separated by the Rh sites, was effective for selective CO 2 production. In the electrostatic electrolysis at 0.5 V vs. RHE, the tandem Pt/Rh/SnO x electrode exhibited higher EOR current density than the Pt and Pt/Rh electrodes after 1.5 h.

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“…The graphene supported PtCo catalyst having the Pt:Co molar ratio equal to 1:7 was prepared by means of rapid microwave heating in the same manner as described in Ref. (18). It has been determined that the Pt and PtCo catalysts were well dispersed on the surface of carbon and graphene, respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The shape and size of catalyst particles were examined using a transmission electron microscope Tecnai G2 F20 X-TWIN equipped with an EDAX spectrometer with an r-TEM detector (14,18).…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

“…Therefore, Ptbased catalysts with transition metals M (Fe, Ni, Co) have recently attracted worldwide attention, because they allow reducing the amount of Pt and enhance the catalytic activities of catalyst and reaction kinetic. It has been determined that the Pt-based catalysts exhibit a better catalytic stability and a higher activity for the oxidation of borohydride (12)(13)(14), methanol (15)(16)(17) and ethanol (17,(18)(19)(20) than the bare Pt catalyst. The catalytic enhancement of Pt alloys with transition metals has been attributed to the PtM alloy formation and the Pt electronic structure change due to the presence of metal, Pt-Pt distance, and d-electron density in Pt (21)(22)(23).…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Electrocatalytic Properties of PtCo/Graphene Catalysts for Ethanol, Methanol and Borohydride Oxidation

Kepenienė

Tamašauskaitė–Tamašiūnaitė

Antanaviciute

et al. 2015

ECS Trans.

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In this study the graphene supported PtCo catalyst with the Pt:Co molar ratio equal to 1:7 was fabricated by means of the rapid microwave heating method with the aim to use it in an alkaline fuel cells, using ethanol, methanol and borohydride as fuel. It was found that the PtCo/GR catalyst with an average particle size of ca. 1-3 nm was synthesized by means of microwave heating of Pt(IV) and Co(II) salts in ethylene glycol solutions. The PtCo/GR catalyst shows an enhanced activity towards the oxidation of H2 generated by catalytic hydrolysis of BH4 – and direct oxidation of BH4 – ions as well as methanol and ethanol oxidation as compared with that at the graphene supported bare Co and Pt/C catalysts. It should be noted that the electrocatalytic activity of the PtCo/GR catalyst depends on the type of fuel.

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Investigation of Graphene Supported Platinum-Cobalt Nanocomposites as Electrocatalysts for Ethanol Oxidation

Cited by 12 publications

References 51 publications

Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation

Electrochemically modified boron-doped diamond electrode with Pd and Pd-Sn nanoparticles for ethanol electrooxidation

Ethanol Oxidation Reaction on Tandem Pt/Rh/SnOx Catalyst

Comparison of Electrocatalytic Properties of PtCo/Graphene Catalysts for Ethanol, Methanol and Borohydride Oxidation

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