New insights into the mechanism of nitrite reduction on a platinum electrode

Duca, Matteo; Kavvadia, V.; Rodríguez, Paramaconi; Lai, Stanley C. S.; Hoogenboom, Thijs; Koper, Marc T. M.

doi:10.1016/j.jelechem.2010.01.019

Cited by 65 publications

(53 citation statements)

References 43 publications

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“…Both peaks were reported before in the literature [4,5]. The first one corresponds to a broad peak that starts to appear at 0.6 V and has a maximum around 0.4 V. This peak has been related with N 2 O formation.…”

Section: Cyclic Voltammetrysupporting

confidence: 68%

“…The first one corresponds to a broad peak that starts to appear at 0.6 V and has a maximum around 0.4 V. This peak has been related with N 2 O formation. The lower potential feature in the hydrogen adsorption region was also described in the literature, for polycrystalline Pt, and has been attributed to hydroxylamine formation [1,4,5]. In the modified electrode, Pt(111)/Bi, the broad peak between 0.6 and 0.3 V almost completely disappears, and the peak at potentials lower than 0.3 V decreases as a consequence of the partial blockage of the surface by Bi adatoms, indicating that Bi does not catalyse these processes.…”

Section: Cyclic Voltammetrysupporting

confidence: 62%

“…Recently, Duca et al [5] showed that the electrochemical reduction of nitrous species on polycrystalline Pt can follow different pathways as a function of the electrode potential and the solution pH. In acidic media, the process is a combination of the nitrite/nitrous acid electro-reactivity with a homogeneous phase reaction producing additional reactive species (NO) from the decomposition of nitrous acid.…”

Section: Introductionmentioning

confidence: 99%

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Nitrite Reduction on Bismuth Modified Pt(111) Surfaces in Different Electrolytic Media

2011

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In this paper, the electrocatalytic enhancement of the Pt(111) surface modified with Bi adatoms towards nitrite reduction and the quantification of the catalytic effect of different adatom coverages are reported. The results were obtained in acidic and neutral media using cyclic voltammetry and in situ infrared spectroscopy measurements and show that the presence of irreversible adsorbed bismuth on Pt(111) electrodes catalyzes nitrite reduction. The presence of the foreign adatom shifts nitrite reduction to potentials as high as 0.80-0.60 V vs RHE, coinciding with the potential at which Bi undergoes its redox surface reaction. Different coverages of Bi on the surface were prepared, revealing that the activity increases with the amount of Bi until its coverage approaches half the saturation of the maximum surface blockage. For higher coverages, the activity decreases steeply, resulting in a volcano-like curve. The spectroelectrochemical experiments show that the main product of nitrite reduction at these high potentials is N 2 O.

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Section: Cyclic Voltammetrysupporting

confidence: 68%

Section: Cyclic Voltammetrysupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Nitrite Reduction on Bismuth Modified Pt(111) Surfaces in Different Electrolytic Media

2011

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“…Nitric acid acts as a strong oxidizing agent and is involved in several industrial processes that can take place in concentrated solutions, stimulating fundamental investigations over decades of electrochemical reactions in this medium [1,2]. For instance, this reduction reaction is involved into the corrosion rate of stainless steel [3,4], but also into applications for the removal of nitrite from ground water, or for the synthesis of hydroxylamine derivatives [5,6].…”

Section: Introductionmentioning

confidence: 99%

On the kinetics of the nitrate reduction in concentrated nitric acid

Lange

Maisonhaute

Robin

et al. 2013

Electrochemistry Communications

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The autocatalytic mechanism involved in the reduction reaction of nitrate in 8M nitric acid solution was investigated in order to propose a complete description of all processes taking place at the interface. A time and potential independent current plateau was observed for low scan rates and was ascribed to limitation by the desorption of NO ads . Data analysis and fit of the experimental chronoamperogram allowed determination of the kinetic constants of the autocatalytic cycle.

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“…Indeed, since the BDD surface is not favorable for adsorption, electrode processes that involve adsorbed intermediates are hindered on diamond, and many outer-sphere redox reactions require large overpotential above the equilibrium potential to proceed efficiently [11]. Here nitrate and nitrite reduction processes involving adsorbates such as NO or N2O, as observed on bulk transition metal electrodes [12], are expected to be favored due to the presence of the nanoparticles over the modified electrodes, which enhances their sensitivity as part of catalytic processes involving metal centers.…”

Section: Nitrate and Nitrite Detectionmentioning

confidence: 99%

Detection of Nitrate/Nitrite Using BDD Electrodes Coated with Metal Nano-Catalysts

Zribi¹,

Scorsone²

2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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Abstract:The aim of this work is to investigate the mechanisms of nitrate and nitrite ions electroreduction in neutral solution at boron doped diamond (BDD) electrodes modified with metal catalyst nanoparticles. The electrode preparation consists in sputtering a thin metal layer onto polycrystalline BDD by a physical vapor deposition method, followed by a dewetting heat treatment at 700 °C under oxygen-free atmosphere. Such a process leads to a stable population of nanosized metal particles as characterized by scanning electron microscopy (SEM) and cyclic voltammetry. Electro-reduction of NO2 − and NO3 − was characterized both on a bare BDD electrode and on BDD electrodes decorated with platinum-gold, ruthenium-gold and ruthenium nanoparticles in the range 4 to 25 mM. The amperometric response was enhanced by the presence of the nanoparticles, the most sensitive electrode being Pt-Au/BDD and Ru-Au/BDD for nitrite and nitrate ions, respectively.

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New insights into the mechanism of nitrite reduction on a platinum electrode

Cited by 65 publications

References 43 publications

Nitrite Reduction on Bismuth Modified Pt(111) Surfaces in Different Electrolytic Media

Nitrite Reduction on Bismuth Modified Pt(111) Surfaces in Different Electrolytic Media

On the kinetics of the nitrate reduction in concentrated nitric acid

Detection of Nitrate/Nitrite Using BDD Electrodes Coated with Metal Nano-Catalysts

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