Electrochemical reduction of NO3− and NO2− on a composite copper thallium electrode in alkaline solutions

Efficient electrochemical reduction of nitrate to nitrogen on tin cathode at very high cathodic potentials

“…4) the reaction order was calculated to be 0.63, 0.78, 0.91 and 0.93 at −2.0, −2.3, −2.7 and −2.9 V, respectively. A fractional reaction order was reported previously by other workers on Pt-Pd-Ge [22], Pd-Sn-Au [30] and Cu-Tl [42] and it was explained assuming a Temkin adsorption [5,27]. Recently, Casella and Contursi [43] reported a value of 1.25 for the reaction order on Pd-Sn in acid medium.…”

Nitrite detection in meat products samples by square-wave voltammetry at a new single walled carbon naonotubes – myoglobin modified electrode

“…In this context, it is well known that, an effective way to solve this problem and to enhance the electrocatalytic activity of an electrode is to appropriately modify its conventional surface, and thus, to shift the overpotential of the redox reaction. Consequently, some new electrocatalytic systems for nitrite determination were developed using electrodes modified with both inorganic and organic compounds as: copper-thallium composite film (Casella & Gatta, 2004), CuNi alloy (Mattarozzi et al, 2013), polyoxometalates (i.e., a 2 -K 7 P 2 VW 17 O 62 Á18H 2 O) (Zhang, Ma, Chen, Pang, & Yu, 2013), ferricyanide-poly(diallyldimethylammonium)-alginate composite film (Qin et al, 2013), graphene oxide (Mani, Periasamy, & Chen, 2012), graphene oxide-multiwalled carbon nanotubes-Pt nanoparticles/myoglobin (Mani, Dinesh, Chen, & Saraswathi, 2014), graphene oxide/Pd nanoparticles (Zhang, Zhao et al, 2013), graphene--Au nanoparticles (Jiang, Fan, & Du, 2014), graphene/phtalocyanine (Cui, Pu, Liu, & He, 2013), chitosan (CS) -Prussian Blue (PB) and graphene nanosheets -carbon nanospheres mixture (Cui et al, 2012), zeolites (Guzmán-Vargas, Oliver-Tolentino, Lima, & Flores-Moreno, 2013), polydiphenylamine -Pt nanoparticles (Unnikrishnan, Ru, Chen, & Mani, 2013), nanocomposite 3,6-bis(2-[2-sulfanyl-ethylimino-methyl]-4-(4-nitro-phenylazo)-phenol)pyridazine coated SiO 2 -Fe 3 O 4 (L-SCMNPs) in carbon paste electrode (Afkhami et al, 2012), ionic-liquid carbon paste electrode (Ojani, Raoof, & Zamani, 2013), electronic tongue (Nuñez, Cetó, Pividori, Zanoni, & del Valle, 2013), tetraruthenated metalloporphyrins , tetrapyridylporphyrins coordinated to four [Ru(5-NO 2 -phen) 2 Cl] + moieties (Dreyse et al, 2011), organoruthenium(II) complexes onto polyethyleneimine-wrapped carbon nanotubes/in situ formed gold nanoparticles (Azadbakht, Abbasi, Derikvand, & Amraei, 2015), hemoglobin (Saadati, Salimi, Hallaj, & Rostami, 2014), hemin (Turdean, Popescu, Curulli, & Palleschi, 2006) and/or myoglobin (Canbay, S ßahin, Kıran, & Akyilmaz, 2015). Despite the huge number of modified electrodes realized in recent years, a simple solution is always more suitable.…”

Rhodium-modified gold polycrystalline surface as anode material in alkaline medium: An electrochemical and XPS investigation

“…These oxides are prepared by anodic, cathodic or spontaneous electrodeposition from solutions containing the relevant metal ions and the physical and electrocatalytic properties of the relevant deposits are easily modulated by means of experimental parameters affecting the electrodeposition processes such as electrolyte composition, pH, applied potential, time of polarisation and electrode substrate. Thus, mixed oxide films formed by electrodeposition of various catalysts such as Ni-Cu, Cu-Tl and Pd-Sn were prepared and successfully characterized as active electrocatalyst for the oxidation of carbohydrates and reduction of nitrate species [12][13][14][15][16].…”