Electrocatalytic Oxidation of Methanol on a Nickel‐Porphyrin IX Complex Modified Glassy Carbon Electrode in Alkaline Medium

Golabi, S.M.; Nozad, A.

doi:10.1002/elan.200302768

Cited by 78 publications

(42 citation statements)

References 60 publications

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“…As previously reported by others, the anodic peak around 497 mV is attributed to the oxidation of a-Ni(OH) 2 and b-Ni(OH) 2 to b-NiOOH or gNiOOH. The reduction peak around 350 mV correspond to the reduction of the coexisting and interconvertible bNiOOH and g-NiOOH [36][37][38][39][40][41][42][47][48][49].…”

Section: Surface Characterization Of the Ni-gcementioning

confidence: 99%

Electrocatalytic Oxidation of Estrogenic Phenolic Compounds at a Nickel‐Modified Glassy Carbon Electrode

et al. 2011

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This paper demonstrates for the first time, successful electrocatalytic oxidation of electroactive estrogenic phenolic compounds (EPCs) at a nickel-modified glassy carbon electrode (Ni-GCE). The electrode was evaluated in terms of electrocatalytic activity, sensitivity, linear dynamic range, limit of detection, and response stability. In comparison to bare glassy carbon electrode, current amplification was observed for EPCs at Ni-GCE, for example, for a 40 mM estrone at Ni-GCE was amplified by a factor of 1224. The Ni-GCE gave good figures of merit with no evidence of electrode fouling. As an example, the limit of detection (S/N = 3) for 17b-estradiol was 100 nM and the response precision (n = 5) was 3.4 %.

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Section: Surface Characterization Of the Ni-gcementioning

confidence: 99%

Electrocatalytic Oxidation of Estrogenic Phenolic Compounds at a Nickel‐Modified Glassy Carbon Electrode

et al. 2011

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“…It is, however, found that majority of the studies concerned with the use of alkaline media for the oxidation of methanol employ pure metals (single and polycrys- talline Pt, Au, Ni) [18][19][20][21][22][23][24][25][26], metal alloys like Ni-Cu [27] and other Ni based electrode systems [28][29][30][31] as anodes. Studies involving use of Pt modified polymer (or supported) electrodes as electrocatalysts for methanol oxidation in alkaline medium are sparse [32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic oxidation of methanol on Pt modified polyaniline in alkaline medium

Nagashree

Ahmed

2008

Synthetic Metals

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a b s t r a c tA comparative study of the electrocatalytic oxidation of methanol is made in NaOH, Na 2 CO 3 and NaHCO 3 on bare Pt (Pt), polyaniline covered Pt (PANI) and Pt modified polyaniline film on Pt (Pt/PANI) using cyclic voltammetry, polarization, ac impedance spectroscopy and chronoamperometric techniques at 25• C. The cyclic voltammetry and polarization studies show that the potentials at which methanol oxidation commences on different electrodes in each of the alkaline medium examined follow the trend Pt/PANI < Pt < PANI whereas the potentials for initiation of oxidation on each electrode in different alkaline media follow the order NaHCO 3 > Na 2 CO 3 > NaOH. The oxidation current is highest and charge transfer resistance lowest for Pt/PANI films compared to Pt in all the media studied. However, for the same Pt loading Pt/PANI films exhibit larger oxidation currents in NaOH followed by Na 2 CO 3 and NaHCO 3 . The Tafel slope for methanol oxidation on Pt/PANI in NaOH, Na 2 CO 3 and NaHCO 3 has a value of about 115 mV decade −1 . The chronoamperometric response of the Pt/PANI film at the peak potential for methanol oxidation shows lesser sensitivity to poisoning by CO compared to bare Pt and platinised Pt (Pt/Pt).

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“…The previous is possible due to the higher conductivity values of the aqueous K-R electrolyte as shown in Table 3. The pH value of 7.4 in electrolyte solution is too low a value for both nickel catalysts, which is earlier reported to be effective with electro catalytic oxidation of carbohydrates, such as primary alcohols in alkaline solutions [16]. The nickel catalyst requires an [OH] -ion concentration in the electrolyte high enough to work effectively in the electro-oxidation of carbohydrates.…”

Section: Resultsmentioning

confidence: 93%

Direct-Mode Glucose Fuel Cells with Near-Neutral-State Electrolytes: Anode Electrode Studies with Different Catalysts and Electrolytes

Petrakis¹,

Kiros²,

Noponen³

et al. 2009

TOEFJ

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Abstract:In the present study, a direct-mode glucose fuel cell with a neutral-state and near-neutral-state aqueous electrolytes is studied. The near-neutral state electrolytes are important for two reasons. Firstly, the pH of the electrolytes would be near the pH of liquid in living cells. Secondly, the neutral electrolyte would enable good corrosion resistance of catalyst materials. Three different catalyst materials, i.e. Pt-Pd, Raney-Ni and Ni-porphyrin complex, are tested in an anode half-cell configuration with one neutral-state (battery water) and with two near-neutral-state aqueous electrolytes, i.e. modified Krebs-Ringer (K-R) and phosphate, both buffered to a pH value of 7.4. Pt-Pd catalyst in the aqueous K-R electrolyte maintains the negative voltage of the anode half cell with higher current densities that the nickel catalysts do. To estimate the operation of the direct-mode glucose fuel cell, the K-R electrolyte from the anode half-cell tests is tested also in the cathode half-cell with combined catalyst of cobalt porphyrin complex and of spinel. The open circuit voltages and polarisation curves are measured. Also, preliminary results and oxidation degrees of glucose in the tests are shown. Based on our half cell measurements, there are high development demands for the electro-catalysts, which could work efficiently in the near-neutral-state electrolytes.

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Electrocatalytic Oxidation of Methanol on a Nickel‐Porphyrin IX Complex Modified Glassy Carbon Electrode in Alkaline Medium

Cited by 78 publications

References 60 publications

Electrocatalytic Oxidation of Estrogenic Phenolic Compounds at a Nickel‐Modified Glassy Carbon Electrode

Electrocatalytic Oxidation of Estrogenic Phenolic Compounds at a Nickel‐Modified Glassy Carbon Electrode

Electrocatalytic oxidation of methanol on Pt modified polyaniline in alkaline medium

Direct-Mode Glucose Fuel Cells with Near-Neutral-State Electrolytes: Anode Electrode Studies with Different Catalysts and Electrolytes

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