Electron transfer kinetics on composite diamond (sp3)–graphite (sp2) electrodes

Duo, I.; Fujishima, Akira; Comninellis, Ch.

doi:10.1016/s1388-2481(03)00169-3

Cited by 113 publications

(73 citation statements)

References 18 publications

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“…Along with the hydrophilic behavior, the electrochemical characteristics of the BDD films were largely affected by such a polarization process, giving rise to decay in the electrochemical reversibility (as exemplified for the ferri/ferrocyanide system in Figure 2, bold line where DE p reaches 0.5 V). Such behavior has already been described in the literature [1 -13] and was attributed to the oxidation of surface sp 2 states present on the BDD surface, that act as primary pathway for electron transfer at as-grown BDD surfaces [14]. More interestingly for (bio)-electroanalysis, BDD electrochemical oxidation leads to the enlargement of the electrochemical window in aqueous media, especially in oxidation for which the electrochemical window rises 1.9 V (vs. Ag/AgCl), allowing with the electrochemical detection of highly positive oxidation species such as purine bases within DNA structures.…”

Section: àmentioning

confidence: 56%

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

et al. 2005

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Boron doped diamond (BDD) films are promising materials for electroanalysis and bioelectroanalysis. This contribution gives a short review on BDD functionalization by chemical and biochemical entities and on the applications of BDD electrodes to electroanalysis of chemical compounds of biological interest. This review is illustrated by the developments on BDD interfaces in both these areas carried out in our group. BDD electrodes were prepared by means of microwave plasma-assisted CVD onto silicon substrate giving rise to H-terminated BDD films. Anodic polarization of BDD electrodes in aqueous media generates hydrophilic oxidized surfaces and extended electrochemical window in aqueous media. We took advantage of this enlarged electrochemical window together with the hydroxylated surface for the functionalization of BDD electrode surfaces with biomolecules and for bioelectroanalysis. We have designed a novel route of BDD functionalization using OH terminations of the anodized surface. The modification of the BDD surface with biotin groups will be presented here as biologically active model. Furthermore, as the anodic potential window of BDD increases upon electrochemical activation, 2'-deoxyguanosine (1.2 V vs. Ag/AgCl) and 2'-deoxyadenosine (1.5 V vs. Ag/AgCl) could be detected electrochemically with an acceptable signal to noise ratio. The electrochemical signature of each oxidizable base was assessed using differential pulse voltammetry (DPV). These experiments pointed towards adsorption of the oxidized products, which were investigated macroscopically by DPV and at the microscopic level by SECM (scanning electrochemical microscopy).

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Section: àmentioning

confidence: 56%

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

et al. 2005

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“…The specific functional groups on BDD electrodes play an important role in mediating reduction of inorganic compounds [32]. In addition, the oxygenated groups such as carboxyl, carbonyl, and hydroxyl groups at BDD electrodes are suspected to be involved in mediating electron transfer at BDD electrodes and remain on the surface even after cathodic polarization [33].…”

Section: Comparison With Other Systemsmentioning

confidence: 99%

Bromate removal by electrochemical reduction at boron-doped diamond electrode

Zhao

Liu

et al. 2012

Electrochimica Acta

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a b s t r a c tThe electrochemical removal of bromate ions was performed with BDD electrodes in a two-compartment electrolytic reactor. Bromate ions removal and the production of Br − were observed and determined. The removal of bromate ions occurred at an applied bias potential of −0.45 V (vs. SCE). And, the removal rate increased with the applied bias potential. Within 2 h, nearly 90% of bromate ions were removed with the applied bias potential of −1.0 V (vs. SCE). Effect of pH on bromate ions removal was slight. SO 4 2− and Cl − ions inhibit the electrochemical reduction of bromate ions, which can be explained by the competitive adsorption of coexisting anions at the electrode surface with the bromate ions. In comparison, the graphite and carbon paper electrode exhibit low catalytic activities toward reduction removal of bromate ions under the same experimental conditions. A possible reason was proposed.

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“…Comprehensive evaluation of polycrystalline diamond electrodes requires knowledge of the effects of surface structure on the electrochemical behavior of diamond. Numerous papers have dealt with the effects of intercrystallite boundaries [3], single crystal face orientation [4,5], grain size [6] (including nanodiamond films [7,8]), nanostructured (''nano-honeycomb'') surface relief [9,10] and sp 2 -carbon inclusions [11,12], on the electrochemical properties of diamond electrodes. However, no studies on the dependence of diamond electrode behavior on its surface roughness have been performed, to our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Synthetic diamond electrodes: The effect of surface microroughnesson the electrochemical properties of CVD diamond thin films on titanium

et al. 2005

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The electrochemical behavior of B-doped diamond films on Ti substrates subjected to different pretreatment procedures (annealing, sand-blasting, and etching in HCl) is evaluated as a function of surface microroughness. Generally, the differential capacitance follows the true surface area of the electrodes. The width of the potential window also increases, but slightly, with the roughness. The electrode reversibility in the [Fe(CN) 6 ] 3) /[Fe(CN) 6 ] 4) redox system increases with increasing surface roughness. The apparent increase in the reversibility of the reaction may be also explained by the decrease in the true current density. Although the variations in the electrochemical parameters are not strongly pronounced, the tendencies observed can be used to optimise the electrode properties.

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Electron transfer kinetics on composite diamond (sp3)–graphite (sp2) electrodes

Cited by 113 publications

References 18 publications

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

Interfacing Boron Doped Diamond and Biology: An Insight on Its Use for Bioanalytical Applications

Bromate removal by electrochemical reduction at boron-doped diamond electrode

Synthetic diamond electrodes: The effect of surface microroughnesson the electrochemical properties of CVD diamond thin films on titanium

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