Electrocatalytic reduction of nitrocompounds on gold UPD modified electrodes

Kokkinidis, G.; Papoutsis, A.; Παπαναστασίου, Γεώργιος

doi:10.1016/0022-0728(93)80413-c

Cited by 24 publications

(19 citation statements)

References 37 publications

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“…It reveals that the formation of peak R 1 , namely the reduction of p-NP, is responsible for the appearance of the reversible redox couples (O 2 /R 2 ). According to existing literatures [15,16,[35][36][37], the oxidation mechanism of p-NP on gold electrode can be described as follows:…”

Section: Methodsmentioning

confidence: 99%

Selective Determination of p‐Nitrophenol Based on Its Unique Voltammetric Behavior on Nanoporous Gold

Liu

Zhang

et al. 2011

Electroanalysis

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In this paper, an unsupported nanoporous gold (us-NPG) was applied as a novel electrochemical sensor material for the selective detection of p-nitrophenol (p-NP) among its isomers in acid solution based on the distinct cyclic voltammetric behavior. To ascertain the ascription of each peak in cyclic voltammograms (CVs) of three nitrophenol isomers (NPs) on the us-NPG, contrast voltammetric studies of NPs were conducted at an ultrathin NPG film supported on glassy carbon substrate (NPG/GC) and a well-defined Au(111) electrode, respectively. Effects of potential scan rate and rotation speed of the electrode on the redox reaction of NPs were investigated to further confirm the reaction mechanisms. Interestingly, unlike those obtained on NPG/GC and Au(111) electrodes, the CVs of both o-nitrophenol (o-NP) and m-nitrophenol (m-NP) on us-NPG presented a new pair of redox waves separated very well from the redox waves of p-NP, indicating an obviously different mechanism involved in the redox process. Based on the voltammetric behavior, trace level determination of p-NP can be achieved on us-NPG electrode in the presence of o-NP and m-NP. Thus, the fast electron transfer, high selectivity and good sensitivity make us-NPG act as an ideal electrochemical sensor material in the selective determination of p-NP in aqueous solutions.

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Section: Methodsmentioning

confidence: 99%

Selective Determination of p‐Nitrophenol Based on Its Unique Voltammetric Behavior on Nanoporous Gold

Liu

Zhang

et al. 2011

Electroanalysis

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“…The reduction involves adsorption of reactants and intermediates and follows direct electron-exchange mechanism on most cathodes except of platinum, in which the reduction proceeds by an electrocatalytic hydrogenation mechanism. The influence of ad-atoms on the reduction of nitro and nitroso compounds on Ag, Au, and Pt electrodes has been studied during the last two decades [55][56][57][58][59][60][61]. It was found that ad-atom layers of Pb, Tl, and Bi deposited at underpotentials have a strong influence on the performance of the above substrates for the nitro and nitroso group electroreduction, both in terms of the improvement of the catalytic activity and the catalytic selectivity of these electrodes.…”

Section: Reduction Of Nitro and Nitroso Compoundsmentioning

confidence: 99%

“…The electrocatalytic influence of Pb(upd) adlayers on the reduction of nitrobenzene on Ag [55] and Au [56] electrodes was studied in acidic solutions. On the bare metals, nitrobenzene is reduced to aniline.…”

Section: Reduction Of Nitrobenzene On Ag/pb(upd) and Au/pb(upd)mentioning

confidence: 99%

“…Tl ad-atoms, deposited on Au in the underpotential region, exert pronounced catalytic effects on the reduction of some N -heterocyclic nitro compounds [56,60,61].…”

Section: Reduction Of Heterocyclic Nitro Compounds On Au/m(upd) Overlmentioning

confidence: 99%

“…6(a). Nitrotriazole undergoes a four-electron reduction both on Au and Au/Pb(upd) [56]. However, the reduction mechanism depends on the UPD ad-atom coverage.…”

Section: The Influence Of Ad-atom Adsorption On Reaction Rates and Mementioning

confidence: 99%

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The Influence of Ad‐atom Adsorption on Reaction Rates and Mechanisms

Kokkinidis

2003

Encyclopedia of Electrochemistry

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The sections in this article are Introduction Metal Ad‐atoms Deposited in the Underpotential Region Electrocatalysis by Ad‐atoms Reactions Catalyzed by Ad‐atoms Reduction of Oxygen Reduction of Nitro and Nitroso Compounds Oxidation of Small Organic Molecules Oxidation of Bigger Organic Molecules Reversible Redox Reactions Inorganic Electrochemical Reactions Conclusion

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