Generation of OH radicals at palladium oxide nanoparticle modified electrodes, and scavenging by fluorescent probes and antioxidants

Liu, Jifeng; Lagger, Grégoire; Tacchini, Philippe

doi:10.1016/j.jelechem.2008.03.017

Cited by 31 publications

(33 citation statements)

References 22 publications

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“…The observed differences between the reactivity of the various surface oxygen phases cannot be entirely related to differences in how strongly oxygen is bound to the surface [20]. Recently, the electroreduction and reduction of palladium oxide nanoparticles in the presence of hydrogen peroxide or dissolved oxygen were investigated [21]. It is desirable to acquire an understanding of the effects of the treatment of Pd/AC with oxidizing/reducing agents and electrochemical reduction/oxidation processes, which can alter the chemistry of the metal particles and the support surface.…”

Section: Introductionmentioning

confidence: 99%

Reduction and oxidation of a Pd/activated carbon catalyst: evaluation of effects

Biniak

Diduszko

Gac

et al. 2010

Reac Kinet Mech Cat

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A commercial Pd/activated carbon catalyst (10%) was treated using several redox processes: reduction with gaseous hydrogen at 140°C, reduction by negative electrochemical polarization in acidic and basic environments, oxidation with aqueous hydrogen peroxide, and positive electrochemical polarization in acidic and basic environments. To establish the electrochemical reduction/oxidation conditions, the potentials of hydrogen and oxygen evolution at Pd/AC powder electrodes were determined from cyclic voltammetric (CV) measurements. The samples were examined for the presence of palladium oxide phases on dispersed metal particles using XRD, TPR, and TPD. The metal oxide phase disappeared following hydrogen and electrochemical reduction. Oxidative treatment of the commercial catalyst differentiated the palladium oxide layers on the metal particle surface. Changes in the surface chemistry of the Pd/PdO/AC system were confirmed by the electrochemical behavior of electrodes prepared from the carbon samples.

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Section: Introductionmentioning

confidence: 99%

Reduction and oxidation of a Pd/activated carbon catalyst: evaluation of effects

Biniak

Diduszko

Gac

et al. 2010

Reac Kinet Mech Cat

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“…In comparison, the powdered Pd electrode (Fig. 7) behaves in much the same way as described in the literature [2, 3,10,15,33]. There is a Pd/Pd 2?…”

Section: Resultsmentioning

confidence: 57%

Cyclovoltammetric studies of carbon materials-supported palladium

Hofman

Świątkowski

Pakuła

et al. 2012

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Various Pd amounts (5 and 20 %wt) were chemically deposited on two different carbon materials (activated carbon and carbon black). Support materials were characterized using low-temperature N 2 adsorption and FTIR spectroscopy. SEM images and X-ray diffraction patterns were obtained for the samples tested. Cyclic voltammetric curves in 0.1 M H 2 SO 4 were recorded over a variable sweep potential range for carbon materials with and without Pd. For comparison, the same electrochemical measurements were performed for powdered palladium. The hydrogen electro-oxidation potential decreased and the removal of adsorbed hydrogen by activated carbon-supported palladium was facilitated, which enables these systems to be used as anodes in hydrogen-oxygen fuel cells.

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“…There are quite a lot reports on the photochemical and electrochemical catalytic mechanism of MONPs [33][34][35][36][37][38][39][40]. In this work, it is proposed that the ECL intensification by MONPs was mainly contributed from the generation of electron-hole couple (e  /h + ) due to the splitting of energy band in those semiconductor MONPs.…”

Section: ·mentioning

confidence: 95%

The intensification of luminol electrochemiluminescence by metallic oxide nanoparticles

Guo

Yan

2011

Sci. China Chem.

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In this work, the intensification of luminol electrochemiluminescence (ECL) by metallic oxide nanoparticles (MONPs), as ZnO, MnO 2 , In 2 O 3 and TiO 2 , under alkaline condition is reported and the related mechanism is studied. It is found that all four types of those MONPs exhibit the effect toward the ECL intensification of luminol. Furthermore, the silica sol-gel film is taken to immobilize the MONPs onto the platinum electrodes. The so-obtained modified electrodes also show the enhanced ECL and better signal/noise ratio, as well improved signal stability. Finally, the ECL reagent, luminol, is immobilized together with the MONPs onto the electrode surface to perform as the ECL sensor. On resulting sensors, good linear responses are obtained toward hydrogen peroxide. The mechanism of intensification of luminol ECL by MONPs is discussed in this paper. It is proposed that the ECL intensification can be attributed to the production of reactive oxygen species, as well as the adsorption of luminol on surface of MONPs. electrochemiluminescence, intensification, luminal, metallic oxide nanoparticles, reactive oxygen species

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Generation of OH radicals at palladium oxide nanoparticle modified electrodes, and scavenging by fluorescent probes and antioxidants

Cited by 31 publications

References 22 publications

Reduction and oxidation of a Pd/activated carbon catalyst: evaluation of effects

Reduction and oxidation of a Pd/activated carbon catalyst: evaluation of effects

Cyclovoltammetric studies of carbon materials-supported palladium

The intensification of luminol electrochemiluminescence by metallic oxide nanoparticles

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