Effect of the electrolyte on the electrochemical behavior of C60 fullerene films in dimethylformamide + water mixtures

Szűcs, András

doi:10.1016/j.jelechem.2008.06.014

Cited by 4 publications

(1 citation statement)

References 27 publications

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“…The complexation of C 60 with organic host molecules is probably the most common method. [2][3][4][13][14][15][16][17][18][19][20][21][22][23][24] An alternative approach to use C 60 in the presence of proton donors is the modification of the electrode surface [25][26][27][28][29][30][31][32][33][34][35][36] by a layer of C 60 prior to immersing in an aqueous solution. Physical and chemical characteristics of fullerenes and C 60 aggregates have been the subject of several recent studies.…”

Section: Introductionmentioning

confidence: 99%

Search for the form of fullerene C60 in aqueous medium

Pospı́šil

Gál

Hromadová

et al. 2010

Phys. Chem. Chem. Phys.

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A transfer of fullerene C(60) to water was achieved by sonication of a two-phase system of water and C(60) in organic solvents, namely, benzene and toluene. Resulting aqueous dispersions were analyzed electrochemically, spectroscopically, by MALDI-MS and AFM methods. Samples prepared from benzene yield the formal redox potential very close to a value expected from the correlation of redox potentials and solvent donor numbers. However, these samples are not stable and C(60) precipitates out of the aqueous dispersion. Sonication of the toluene/water system produces stable system, in which the measured formal redox potential of C(60) is less negative. Stabilization of C(60) clusters in water is achieved by the presence of an organic amphiphile and spectroscopic methods indicate the presence of benzoate formed during sonication of a toluene/water mixture.

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Section: Introductionmentioning

confidence: 99%

Search for the form of fullerene C60 in aqueous medium

Pospı́šil

Gál

Hromadová

et al. 2010

Phys. Chem. Chem. Phys.

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Salts of C₆₀(OH)₈ Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

et al. 2013

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Full(erene) of surprises: The first isomerically pure multi‐hydroxylated fullerene, C60(OH)8, shows a reduction peak and a reoxidation peak in aqueous solution. With surprising catalytic performance in the hydrogen evolution reaction (HER), when electrodeposited on a glassy carbon electrode (GCE), salts of C60(OH)8 may prove to be effective molecular catalysts for conducting the HER without transition metals.

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Salts of C₆₀(OH)₈ Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

et al. 2013

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With the energy crisis becoming increasingly serious, hydrogen is proposed as a promising energy carrier substitute to fossil energy. A practical technique to produce hydrogen is the splitting of water by either electrochemical or photochemical methods. [1] Usually, catalysts are widely used to overcome the overpotential for the hydrogen evolution reaction (HER) and to obtain high efficiency. Among the catalysts produced for the HER, Pt, Pd, and Ru show the best performance, but their high cost seriously limits their use. On the other hand, less expensive substitutes using metals such as Ni and Co suffer from corrosion, passivation, and lower catalytic activity. [2] The need for active, stable, and inexpensive electrocatalysts has aroused intensive research interest, resulting in the development of molecular catalysts. Thus far, relatively few molecular catalysts have been studied for the HER in aqueous solutions, and most of catalysts studied consisted of transition metals. [3] Herein, we report a novel molecular catalyst based on carbon: a salt consisting of fullerenol anions electrodeposited onto a glassy carbon electrode (GCE) coated with Nafion in an aqueous solution for the HER. The onset potential was estimated to be À0.11 V (vs. RHE) with low loading and high exchange current density.Polyhydroxylated fullerene (fullerenol) is one of the most studied fullerene derivatives, because of their low biological toxicity and outstanding radical scavenging ability. [4] Various synthetic methods have been reported, [5] but most of them obtained complicated mixtures of fullerenols with different structures, which limited further study of their properties. We have previously reported the preparation of the first isomerically pure multihydroxylated fullerene, C 60 (OH) 8 . [6] Its sol-ubility in water is much greater than that of C 60 due to the eight hydroxy groups on the carbon cage, which makes it possible to study its electrochemical properties in aqueous solutions; these properties are fundamental for investigating electrocatalysis based on fullerenols. There have been few reports to date about the electrochemical properties of fullerenols in water, [7,8] therefore, we investigated electrochemical behavior of C 60 (OH) 8 in aqueous solutions. Figure 1 displays a cyclic voltammogram of C 60 (OH) 8 in an aqueous solution of KCl (0.1m). A reduction peak at À1.31 V (vs. SCE) and an oxidation peak at À1.11 V were observed. The experimental results indicated that the cations of the supporting electrolyte influenced the electrochemical behavior of C 60 (OH) 8 . Optimal current responses were obtained in NaCl and KCl solutions, and their redox peak potentials were identical. The possible explanation is that the sizes of sodium and potassium cations are more suitable for intercalation into the lattice of C 60 (OH) 8 crystals to compensate for the negative charge and stabilize its crystal structure upon electrochemical reduction of C 60 (OH) 8 . Therefore, NaCl and KCl were chosen as the supporting electrolytes for the fo...

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Effect of the electrolyte on the electrochemical behavior of C60 fullerene films in dimethylformamide + water mixtures

Cited by 4 publications

References 27 publications

Search for the form of fullerene C60 in aqueous medium

Search for the form of fullerene C60 in aqueous medium

Salts of C₆₀(OH)₈ Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

Salts of C₆₀(OH)₈ Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

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Effect of the electrolyte on the electrochemical behavior of C60 fullerene films in dimethylformamide + water mixtures

Cited by 4 publications

References 27 publications

Search for the form of fullerene C60 in aqueous medium

Search for the form of fullerene C60 in aqueous medium

Salts of C60(OH)8 Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

Salts of C60(OH)8 Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

Contact Info

Product

Resources

About

Salts of C₆₀(OH)₈ Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction

Salts of C₆₀(OH)₈ Electrodeposited onto a Glassy Carbon Electrode: Surprising Catalytic Performance in the Hydrogen Evolution Reaction