Detection of Hydroxide Ions in Aqueous Solutions by Steady-State Voltammetry

Abdelsalam, Mamdouh E.; Denuault, Guy; Baldo, M. Antonietta; Bragato, Carlo; Daniele, Salvatore

doi:10.1002/1521-4109(200103)13:4<289::aid-elan289>3.0.co;2-f

Cited by 32 publications

(21 citation statements)

References 19 publications

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“…hydroxide. In contrast to results obtained at gold micro-electrodes [4], the linearity is valid for all scan rates for modified electrodes. For phthalocyanine and porphyrin modified electrodes, there is no interference between the wave corresponding to the formation of gold oxides with the wave for the hydroxide oxidation.…”

Section: Oxidation Of Hydroxide At Several Phthalocyanine or Porphyricontrasting

confidence: 77%

“…For phthalocyanine and porphyrin modified electrodes, there is no interference between the wave corresponding to the formation of gold oxides with the wave for the hydroxide oxidation. The latter is the case at gold micro-electrodes making the wave due to hydroxide oxidation less defined and no longer useful for analytical purposes at high scan rates [4]. Fig.…”

Section: Oxidation Of Hydroxide At Several Phthalocyanine or Porphyrimentioning

confidence: 99%

“…A series of papers is devoted to the voltammetric determination of hydroxide ions with formation of oxygen in aqueous solutions by using micro-electrodes or rotating disc electrodes [4][5][6]. In these cases, the concentration of bases can be determined by direct oxidation of hydroxide ions.…”

Section: Introductionmentioning

confidence: 99%

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Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Wael

Adriaens

2008

Talanta

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This work reports on the electrocatalytic oxidation of hydroxide using different central metal ion phthalocyanines and porphyrins immobilized on gold electrodes. The apparent electrocatalytic activity of cobalt phthalocyanine or porphyrin modified electrodes was found to be the greatest among the present series of metal ion macrocycles investigated. Copper and unmetallated phthalocyanine or porphyrin modified electrodes show no electrocatalytic behaviour towards hydroxide, such as bare gold. A possible mechanism for the enhanced reactivity of cobalt ion macrocycles towards the oxygen evolution is given. It is also stated that the electrocatalytic activity towards an adsorbate involves several aspects, such as the coordination state of the central metal ion, the nature of the ligand, the stability of the complexes, the number of d electrons, the energy of orbitals and the strength of the bonding between the central metal ion and the axial ligand.

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Section: Oxidation Of Hydroxide At Several Phthalocyanine or Porphyricontrasting

confidence: 77%

Section: Oxidation Of Hydroxide At Several Phthalocyanine or Porphyrimentioning

confidence: 99%

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Comparison between the electrocatalytic properties of different metal ion phthalocyanines and porphyrins towards the oxidation of hydroxide

Wael

Adriaens

2008

Talanta

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“…The voltammogram shows two well-defined oxidation and reduction peaks. The oxidation peak (I a ) at 0.50 V can be determined as the oxidation of the gold surface and is linked to the reduction process (I c ) at 0.15 V. The latter can in its turn be explained as the reduction of the gold oxides formed during surface oxidation [15].…”

Section: Methodsmentioning

confidence: 99%

Electrochemical and spectroscopic characterization of a gold electrode modified with 3,4′,4″,4‴ copper(II) tetrasulphonated phthalocyanine

Wael

Peeters

Bogaert

et al. 2007

Journal of Electroanalytical Chemistry

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This paper describes an electrochemical and spectroscopic study of a gold electrode modified with 3,4 0 ,4 00 ,4 000 copper(II) tetrasulphophthalocyanine tetrasodium salt (CuTSPc). Its electrochemical behaviour is compared to that with random CuTSPc and cobalt(II) tetrasulphophthalocyanine tetrasodium salt (CoTSPc). In addition electrochemical and synchrotron radiation X-ray fluorescence measurements were performed to characterize the adsorbed copper surface concentration.

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“…microdiscs and microrings, achieve steady state diffusion owing to their geometry; this steady state regime is established very quickly (typically a few ms for micrometre size electrodes) hence removing the need for a diffusion barrier. The limiting current obtained under these steady state conditions can be used to determine the concentration of an analyte without the need for a calibration (Abdelsalam et al, 2001;Sosna et al, 2007). Such an approach was successfully used to record dissolved oxygen profiles with a microdisc sensor mounted on a CTD (Sosna et al, 2008) however the microdisc response still suffered from convection despite the use of a stopped flow system.…”

Section: Microelectrodesmentioning

confidence: 99%