Nitrate and nitrite electrocatalytic reduction on Rh-modified pyrolytic graphite electrodes

Brylev, Oleg; Sarrazin, Mathieu; Roué, Lionel; Bélanger, Daniel

doi:10.1016/j.electacta.2007.03.072

Cited by 193 publications

(89 citation statements)

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“…NO 2 À testing was performed using the FeMAPc-MPA/ AuNPs modified glassy carbon electrode in phosphate buffer solution (0.1 M, pH 5.8). NO 2 À in acidic solution is well known to be unstable and can undergo transformations to NO and NO 3 À , [40] but the oxidation of nitrite at higher pH values is difficult due to deficiency of protons [41]. Therefore, 0.1 M PBS pH 5.8 was selected for electrochemical nitrite detection studies.…”

Section: Cyclic Voltammetry Measurementsmentioning

confidence: 99%

Electrocatalytic Nitrite Determination Using Iron Phthalocyanine Modified Gold Nanoparticles

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The inside cover picture shows the catalytic degradation of a stem‐loop motif of the structured hepatitis C IRES RNA in an HCV‐infected liver cell. Catalytic metallodrugs promote irreversible degradation of the RNA and demonstrate significant antiviral activity in a cellular HCV replicon assay. MALDI‐TOF mass spectrometry combined with computational analysis provides insights into the site‐specific cleavage mechanism. For more details, see the Full Paper by James A. Cowan et al. on

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Section: Cyclic Voltammetry Measurementsmentioning

confidence: 99%

Electrocatalytic Nitrite Determination Using Iron Phthalocyanine Modified Gold Nanoparticles

et al. 2015

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“…[7] Rhodiumo ng raphite was studied by Brylev et al who identified NH 4 + as the only product in 1 m NaCl. [6] On the otherh and, nitrate reductases can selectively reduce micromolar levels of NO À 3 to NO À 2 at pH 7( Scheme1). In this study,w eh ave used the E. coli nitrate reductase, NarGHI, which comprises ac atalytic NarG subunit, electron-relaying NarH subunit, and membrane anchor, NarI.…”

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confidence: 99%

“…[2b, 4,6] The exact product distribution at Pt hasn ot been established, [2b, 4] but NH 3 OH + has been reported as ap roduct in acidic and alkaline media. [7] Rhodiumo ng raphite was studied by Brylev et al who identified NH 4 + as the only product in 1 m NaCl.…”

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Combining Noble Metals and Enzymes for Relay Cascade Electrocatalysis of Nitrate Reduction to Ammonia at Neutral pH

et al. 2015

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Electrocatalytic reduction of nitrate at noble metals is particularly sluggish at neutral pH, while nitrate reductase enzymes are highly active for selective reduction of nitrate to nitrite under these conditions. However,n oble metal electrodes can effectively reducen itrite, even at millimolar concentrations in neutralm edia. In this study,w ed emonstrate tandeme lectrochemicalr eductiono fn itrate to ammonia by combining Escherichia (E.) coli nitrate reductase (NarGHI) on an electrode with Pt or Rh nanoparticles. Under potentialc ontrol, the enzyme first reduces nitrate to nitrite, which is further reduced by the metal at as lightly more negative potential. This creates an ovel electrocatalytic relay cascade where the enzyme overcomes an inherentl imitation of the metal.T his proof-of-concept study,u sing biologicala nd metal catalysts supported on commercial carbon beads, demonstrates as imple approach to the assembly of 'hybrid' electrocatalysts.Anthropogenic imbalances in the global nitrogen cycleh ave raised increasing concern for their potentially noxiouse ffects on the environment and on public health.[1] Nitrate, being ap romoter of algal bloomsa nd ap recursort on itrite, at oxic anion, is the main target of international legislation setting am aximum allowable limit for its concentration in ground and drinking water.S ignificant quantities of nitrate from agricultural activities and acid rain reach groundwater,c alling for efficient approaches to wastewater remediation. Electrocatalytic methods stand poisedt ob ecomeaviable option, and electrochemicalr eactorsh ave been developed; [2] however,t here are significant barriers to their implementation. In particular, noble metal catalysts performp oorly in neutral media (the most commonp Ho fa griculture runoff) andr elease harmful products such as NH 2 OH. Bioelectrochemical reactorsa nd microbial fuel cells, [2,3] both of which incorporate bacterial cellsg rafted onto an electrode, have also been demonstrated for nitrater eduction. Selectivity to dinitrogen,t he mostd esirable product, is an issue fora ll availablen itrater eduction catalytic systems. [2b, 4] The two-electron reduction of NO À 3 to NO À 2 is the rate-determining step (Scheme 1) for noble metals, [2b] particularly at NO

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“…The electrode materials that reveal high activity in NRR are limited to noble metals and their bimetallic alloys [4,20] as well as graphene [21]. However, most of these electrocatalytical systems require high acidity [4] or alkalinity [22,23] for effective NRR. The electrocatalysis of NRR has been observed on electrodes functionalized with transition metal ions cyclams at rather negative potentials (ca.…”

Section: Introductionmentioning

confidence: 99%

Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles

Imar

Yaqub

Maccato

et al. 2015

Electrochimica Acta

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Nitrate and nitrite electrocatalytic reduction on Rh-modified pyrolytic graphite electrodes

Cited by 193 publications

References 50 publications

Electrocatalytic Nitrite Determination Using Iron Phthalocyanine Modified Gold Nanoparticles

Electrocatalytic Nitrite Determination Using Iron Phthalocyanine Modified Gold Nanoparticles

Combining Noble Metals and Enzymes for Relay Cascade Electrocatalysis of Nitrate Reduction to Ammonia at Neutral pH

Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles

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