Electrode reactions and accumulation of hydrogen at carbon paste electrodes in the presence of tetrachloropalladate

Lubert, Karl‐Heinz; Guttmann, Markus; Beyer, L.

doi:10.1016/s0022-0728(98)00404-5

Cited by 21 publications

(10 citation statements)

References 28 publications

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“…These CV experiments using a glassy carbon electrode immersed in a solution of PdCl 2 clearly show that various palladium redox processes can occur. Based on the results already reported [23][24][25][26][27][28][29][30][31][32][33][34][35], the observed peaks can be related to the different possible palladium oxidation states such as Pd(0), Pd(II) and Pd(IV) that undergo several redox reactions such as Pd(0) nanoparticles deposit, or Pd(0) oxidation to Pd(II) and Pd(IV) and palladium oxide formation.…”

Section: Redox Behaviour Of Palladium Chloride In Solutionmentioning

confidence: 62%

“…Research on palladium electrochemical behaviour started about three decades ago and was carried out using palladium metal electrodes [23][24][25][26][27][28] or, more recently, gold [28,30] or carbon electrodes [8][9][10][31][32][33][34][35][36][37] modified with palladium in different ways. Microscopy techniques, such as atomic force microscopy (AFM) and scanning electron microscopy have been used to investigate the surface morphology of graphite electrodes modified with electrodeposited palladium nanoparticles [8,9,36,38] and nanowires obtained by electrochemical step edge decoration [10,35,37].…”

Section: Introductionmentioning

confidence: 99%

“…The complexity of palladium electrochemical behaviour in aqueous media is well recognized [31][32][33][34][35]. Among the possible reactions involved are: monolayer oxide formation, metal dissolution, oxygen absorption and hydrous oxide formation [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Palladium nanoparticles and nanowires deposited electrochemically: AFM and electrochemical characterization

Diculescu

Chiorcea-Paquim

Corduneanu

et al. 2007

J Solid State Electrochem

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Palladium nanoparticles and nanowires electrochemically deposited onto a carbon surface were studied using cyclic voltammetry, impedance spectroscopy and atomic force microscopy. The ex situ and in situ atomic force microscopy (AFM) topographic images showed that nanoparticles and nanowires of palladium were preferentially electrodeposited to surface defects on the highly oriented pyrolytic graphite surface and enabled the determination of the Pd nanostructure dimensions on the order of 50-150 nm. The palladium nanoparticles and nanowires electrochemically deposited onto a glassy carbon surface behave differently with respect to the pH of the electrolyte buffer solution. In acid or mild acid solutions under applied negative potential, hydrogen can be adsorbed/absorbed onto/into the palladium lattice. By controlling the applied negative potential, different quantities of hydrogen can be incorporated, and this process was followed, analysing the oxidation peak of hydrogen. It is also shown that the growth of the Pd oxide layer begins at negative potentials with the formation of a pre-monolayer oxide film, at a potential well before the hydrogen evolution region. At positive potentials, Pd(0) nanoparticles undergo oxidation, and the formation of a mixed oxide layer was observed, which can act as nucleation points for Pd metal growth, increasing the metal electrode surface coverage. Depending on thickness and composition, this oxide layer can be reversibly reduced. AFM images confirmed that the PdO and PdO 2 oxides formed on the surface may act as nucleation points for Pd metal growth, increasing the metal electrode surface coverage.

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Section: Redox Behaviour Of Palladium Chloride In Solutionmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Palladium nanoparticles and nanowires deposited electrochemically: AFM and electrochemical characterization

Diculescu

Chiorcea-Paquim

Corduneanu

et al. 2007

J Solid State Electrochem

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“…It could be seen that significant evolution of hydrogen happened at a much more positive potential on an FSDNA-Pd-GCE than that on a bare GCE (a 0.6 V difference in hydrogen evolution potentials was observed). There was an oxidation peak at À0.02 V during a return positive scan on the FSDNA-Pd-GCE, which might be related to the oxidative desorption of hydrogen from the palladium nanoparticles [11,31]. If the potential window was limited to be more positive than À0.25 V, both the hydrogen evolution current and the oxidative hydrogen desorption peak disappeared (see Fig.…”

Section: Oxygen Reduction At Pd Nanoparticle Modified Gcesmentioning

confidence: 98%

DNA-assisted electroless deposition of highly dispersed palladium nanoparticles on glassy carbon surface: Preparation and electrocatalytic properties

Shao

Lü

Deng

2009

Journal of Electroanalytical Chemistry

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“…A couple of small redox peaks can be found at Epa -0.42 V (IVa) and Epc -0.69 V (IVc), these are caused by oxidation and reduction of adsorbed hydrogen species, respectively (H + + e -→ Hsorbed). 38 When the anodic sweep limit was extended to 1.3 V, phenosafranine can be oxidized to form phenosafranine radical cations, followed by radical dimerization via a carbon-nitrogen coupling route. 34 The molecular structure of phenosafranine and the proposed structure of PPS are shown in Scheme 1.…”

Section: Preparation Of Modified Electrodesmentioning

confidence: 99%

Novel Nitrite Sensing Using a Palladium-polyphenosafranine Nano-composite

Zhu

Lin

2007

ANAL. SCI.

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A novel palladium-polyphenosafranine nano-composite (PPS-Pd) was synthesized by electrochemical co-deposition at a glassy carbon electrode (GCE) for fabrication of a nitrite sensor, PPS-Pd/GCE. This PPS-Pd film was characterized by X-ray photoelectron spectroscopy (XPS) and field emission scanning electron microanalysis (SEM). It was found that the PPS-Pd nano-composite consisted of Pd nanoparticles smaller than 10 nm in diameter which stick together due to the polymer, forming a Pd-embedded PPS layer structure. The sensing ability was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and differential pulse amperometry (DPA). The PPS-Pd/GCE had excellent catalytic activity toward the oxidation of nitrite: high current sensitivity of 0.365 A/M cm -2 , good reproducibility, good stability and fast response. In neutral solutions, a linear concentration range of 1.0 × 10 -6 to 1.1 × 10 -3 M (R 2 = 0.999) with the detection limit (s/n = 3) of 3 × 10 -7 M nitrite was obtained for DPV determination.

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Electrode reactions and accumulation of hydrogen at carbon paste electrodes in the presence of tetrachloropalladate

Cited by 21 publications

References 28 publications

Palladium nanoparticles and nanowires deposited electrochemically: AFM and electrochemical characterization

Palladium nanoparticles and nanowires deposited electrochemically: AFM and electrochemical characterization

DNA-assisted electroless deposition of highly dispersed palladium nanoparticles on glassy carbon surface: Preparation and electrocatalytic properties

Novel Nitrite Sensing Using a Palladium-polyphenosafranine Nano-composite

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