Kinetics of reduction of nitric acid by electrochemical method and validation of cell design for plant application

Mishra, Satyabrata; Lawrence, Falix; Mallika, C.; Pandey, N. K.; Srinivasan, R.; Mudali, U. Kamachi; Natarajan, R.

doi:10.1016/j.electacta.2015.01.099

Cited by 14 publications

(4 citation statements)

References 38 publications

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“…−1 V ( Figure 3 b), which is shifted to about −0.54 V at pH = 1.3. This could correspond to the reduction of nitrate ions and the hydrogen evolution reaction (HER), as described elsewhere [ 5 , 31 ]. Both processes provoke the enhancement of the pH value in the vicinity of the working electrode surface due to generation of OH − and the consumption of the H 3 O + species.…”

Section: Resultsmentioning

confidence: 99%

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The Potentiodynamic Bottom-up Growth of the Tin Oxide Nanostructured Layer for Gas-Analytical Multisensor Array Chips

Fedorov

Podgainov

Varezhnikov

et al. 2017

Sensors

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We report a deposition of the tin oxide/hydroxide nanostructured layer by the potentiodynamic method from acidic nitrate solutions directly over the substrate, equipped with multiple strip electrodes which is employed as a gas-analytical multisensor array chip. The electrochemical synthesis is set to favor the growth of the tin oxide/hydroxide phase, while the appearance of metallic Sn is suppressed by cycling. The as-synthesized tin oxide/hydroxide layer is characterized by mesoporous morphology with grains, 250–300 nm diameter, which are further crystallized into fine SnO2 poly-nanocrystals following heating to 300 °C for 24 h just on the chip. The fabricated layer exhibits chemiresistive properties under exposure to organic vapors, which allows the generation of a multisensor vector signal capable of selectively distinguishing various vapors.

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Section: Resultsmentioning

confidence: 99%

“…Indeed, the nitrate reduction is usually considered to follow a series of parallel reactions which produces a number of products such as N 2 , NO 2 − , NH 3 , etc. [ 31 , 32 ], e.g. :

…”

Section: Resultsmentioning

confidence: 99%

The Potentiodynamic Bottom-up Growth of the Tin Oxide Nanostructured Layer for Gas-Analytical Multisensor Array Chips

Fedorov

Podgainov

Varezhnikov

et al. 2017

Sensors

View full text Add to dashboard Cite

show abstract

“…Since a high nitrate level in the drinking water has been proven to be one of the inducements of methemoglobinemia and gastrointestinal cancer, it is important to limit the concentration of nitrate in groundwater and other water bodies [ 3 , 4 , 5 ]. Reducing the nitrate emission from industry effluents is an effective way to limit nitrate pollution since nitric acid is widely used in several industries, such as the nuclear industry and the explosives industry [ 6 , 7 ]. The wastewater from these industries could be strongly acidic with a high concentration of nitrate, which is hardly treated by traditional biological treatments [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…Reducing the nitrate emission from industry effluents is an effective way to limit nitrate pollution since nitric acid is widely used in several industries, such as the nuclear industry and the explosives industry [ 6 , 7 ]. The wastewater from these industries could be strongly acidic with a high concentration of nitrate, which is hardly treated by traditional biological treatments [ 7 ]. An efficient method of removing nitrate from acidic solutions is highly needed.…”

Section: Introductionmentioning

confidence: 99%

N-Doped Graphene as an Efficient Metal-Free Electrocatalyst for Indirect Nitrate Reduction Reaction

2021

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N-doped graphene samples with different N species contents were prepared by a two-step synthesis method and evaluated as electrocatalysts for the nitrate reduction reaction (NORR) for the first time. In an acidic solution with a saturated calomel electrode as reference, the pyridinic-N dominant sample (NGR2) had an onset of 0.932 V and a half-wave potential of 0.833 V, showing the superior activity towards the NORR compared to the pyrrolic-N dominant N-doped graphene (onset potential: 0.850 V, half-wave potential: 0.732 V) and the pure graphene (onset potential: 0.698 V, half-wave potential: 0.506 V). N doping could significantly boost the NORR performance of N-doped graphene, especially the contribution of pyridinic-N. Density functional theory calculation revealed the pyridinic-N facilitated the desorption of NO, which was kinetically involved in the process of the NORR. The findings of this work would be valuable for the development of metal-free NORR electrocatalysts.

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Electrochemical Evaluation of Penta‐Coordinated Fe Phthalocyanine During the Oxygen Reduction Reaction in Various Acidic Solutions

Zúñiga Loyola,

Troncoso,

Gatica Caro

et al. 2024

ChemElectroChem

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Iron phthalocyanine (FePc) was penta‐coordinated with pyridine ligand (Py) grafted on carbon nanotube (CNT), to form (FePc‐Py‐CNT). The complex was studied as a catalyst for the oxygen reduction reaction ORR in seven different supporting electrolytes: OH− (0.1 M), OH− (1 M), NO3− (1 M), HSO4− (1 M), ClO4− (1 M), Br− (1 M), Cl− (1 M), to unveil anion‐poisoning effects and mechanism. Through cyclic voltammetry and polarization curves in N2 and O2 saturated atmospheres, thermodynamic and kinetic data were acquired. In acid media, the formal potential Fe(III)/(II) (E0’Fe(III)/(II)) of the complex is biased to more negative potentials by the anion presence. Similar effects were observed for the onset potential (Eonset) during polarization curves for the ORR. When the ORR was performed in the presence of either ClO4−, or HSO4−, anions, Tafel analysis showed different values depending if were derived from the low or from the high overpotential regions, revealing an inner‐sphere electron transfer mechanism (ISET). The Tafel values derived from measurements in the presence of Cl− and Br− anions do not change when extracted at low or at high overpotentials evidencing an outer‐sphere reaction mechanism (OSET). Gibbs free energies were derived from poisoning tests confirming the ISET and OSET mechanisms. The poisoning effect is responsible for the immediate loss of performance for these catalysts during the ORR in acidic media.

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Kinetics of reduction of nitric acid by electrochemical method and validation of cell design for plant application

Cited by 14 publications

References 38 publications

The Potentiodynamic Bottom-up Growth of the Tin Oxide Nanostructured Layer for Gas-Analytical Multisensor Array Chips

The Potentiodynamic Bottom-up Growth of the Tin Oxide Nanostructured Layer for Gas-Analytical Multisensor Array Chips

N-Doped Graphene as an Efficient Metal-Free Electrocatalyst for Indirect Nitrate Reduction Reaction

Electrochemical Evaluation of Penta‐Coordinated Fe Phthalocyanine During the Oxygen Reduction Reaction in Various Acidic Solutions

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