The effect of cathode material on nitric acid reduction kinetics

Razygraev, V. P.; Lebedeva, M. V.

doi:10.1134/s2070205114070156

Cited by 4 publications

(8 citation statements)

References 2 publications

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“…Both mechanisms occur only in highly acidic conditions below nitrate concentrations of 4.0 m. At nitric acid concentrations >4.0 m, nitric acid naturally decomposes into NO and N 2 O 4 according to equilibria (14) and (15). [46,47] Both NO and N 2 O 4 can lead to the formation of HNO 2 (Reaction (12) and (13)), and this occurs without requiring electrochemical charge transfer reactions. Therefore, these cannot be considered a part of an indirect electrochemical reduction of NO 3…”

Section: −mentioning

confidence: 99%

“…At nitric acid concentrations >4.0 m , nitric acid naturally decomposes into NO and N 2 O 4 according to equilibria (14) and (15). [ 46,47 ] Both NO and N 2 O 4 can lead to the formation of HNO 2 (Reaction (12) and (13)), and this occurs without requiring electrochemical charge transfer reactions. Therefore, these cannot be considered a part of an indirect electrochemical reduction of NO 3 − within an autocatalytic cycle, as discussed above

\begin{matrix} 2 {HNO}_{3} \to 2 NO + 3 / 2 O_{2} + H_{2} O \end{matrix}

\begin{matrix} 2 {HNO}_{3} \to 2 N_{2} O_{4} + 1 / 2 O_{2} + H_{2} O \end{matrix}

…”

Section: Understanding Of Electrochemical Nitrate Reduction Mechanismsmentioning

confidence: 99%

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Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

et al. 2020

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The increasing amount of anthropogenic nitrogen has resulted in alarming levels of nitrate in bodies of water and caused a cascade of damage to the environment and human health. Electrochemical nitrate reduction is an efficient strategy ancillary to biological nitrogen cycle management, which utilizes electrons as green reductants and rebalances the N 2 cycle. In this review, the fundamental principles and implementation of electrochemical nitrate reduction are described to lay the foundation for the eventual large-scale application in the remediation of nitrate-laden wastewaters. Factors that influence the activity and selectivity of electrochemical nitrate reduction are also discussed. Moreover, electrolytic cell design and construction are discussed via a rational choice of critical components and assembly. Finally, a roadmap for the development of highly selective nitrate reduction catalysts is proposed. This review attempts to provide a practical strategy for electrochemical nitrogen cycle management and aims to stimulate future research for final implementation.

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Section: −mentioning

confidence: 99%

\begin{matrix} 2 {HNO}_{3} \to 2 NO + 3 / 2 O_{2} + H_{2} O \end{matrix}

\begin{matrix} 2 {HNO}_{3} \to 2 N_{2} O_{4} + 1 / 2 O_{2} + H_{2} O \end{matrix}

…”

Section: Understanding Of Electrochemical Nitrate Reduction Mechanismsmentioning

confidence: 99%

Restoring the Nitrogen Cycle by Electrochemical Reduction of Nitrate: Progress and Prospects

et al. 2020

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“…Concentrated nitric acid is a complex medium involving various nitrogen species in the liquid and gas phases. Therefore, many works have been devoted to the study of the reduction mechanism of nitric acid on inert metals [7][8][9][10][11][12][13][14][15][16]. All these works have concluded the existence of an autocatalytic mechanism for which HNO 3 is not considered an autocatalytic species.…”

Section: Introductionmentioning

confidence: 99%

“…About 60 years ago, Vetter [10,16] and Schmid et al [7][8][9] independently proposed reduction mechanisms on platinum for nitric acid concentrations in the range of 1 to 10 mol L -1 at 20 °C. Later, Razygraev et al [11,12] performed experiments in 2 mol L -1 boiling nitric acid, showing that both of the proposed previous mechanisms [3][4][5][6] may occur, but at different cathodic overpotentials. These results were subsequently confirmed by Sicsic et al [13] through experimental work performed in 4 mol L -1 nitric acid solution at 40 °C on platinum and gold electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…The following mechanism was thus proposed: (10) Below 0.65 V/SHE, the autocatalytic cycle is interrupted by the reduction reaction of NO into N 2 O (Eq. (11), which results in a significant decrease (in absolute value) of the cathodic current density. (11) Nevertheless, the nitric acid electrolyte remains a medium of great complexity in which reactions are difficult to predict accurately due to multiple parameters.…”

Section: Introductionmentioning

confidence: 99%

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