Electrochemical behaviour of tris(1,10-phenanthroline)ruthenium(II) at a surface modified electrode. Electrocatalytic reduction of dioxygen

Shee, Nirmal K.; Patra, Subrata; Drew, Michael G. B.; Lü, Liping; Zangrando, Ennio; Datta, Dipankar

doi:10.1016/j.ica.2017.05.074

Cited by 5 publications

(4 citation statements)

References 59 publications

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“…From the slope of the line in Figure and the equation, one calculates the diffusion coefficient of Co(HCO 3 ) n (H 2 O) 6− n 2− n to be D o =9.87×10 −6 cm 2 s −1 . By using Nicholson's method (see the Supporting Information for details), one calculates that the rate constant for the electron transfer from Co(HCO 3 ) n (H 2 O) 6− n 2− n to the electrode is: k 0 =(0.73±0.10)×10 −3 cm s −1 (Table S1 in the Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…The cyclic voltammograms at the various scan rates and ap lot of i d versus v 1/2 are shown in Figure 6a and b, respectively.C onsequently,t he Randles-Sevcik equation [79] is valid. From the slope of the line in Figure6 and the equation, one calculates the diffusion coefficient of Co(HCO 3 ) n (H 2 O) 6Àn 2Àn to be D o = 9.87 10 À6 cm 2 s À1 .B y using Nicholson's method [80,81] (see the Supporting Information for details), one calculates that the rate constant for the electron transfer from Co(HCO 3…”

Section: The First Wave Co Iii/iimentioning

confidence: 99%

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Cobalt Carbonate as an Electrocatalyst for Water Oxidation

Patra

Illés

Mizrahi³

et al. 2019

Chemistry A European J

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Co II salts in the presence of HCO 3 À /CO 3 2À in aqueous solutionsa ct as electrocatalysts for water oxidation. It comprises of several key steps:( i) Ar elatively small wave at E pa % 0.71 V( vs. Ag/AgCl) owing to the Co III/II redox couple. (ii)Asecond wave is observed at E pa % 1.10 Vwith aconsiderably larger current.I nw hich the Co III undergoes oxidation to form aC o IV species. The large current is attributed to catalytic oxidation of HCO 3 À /CO 3 2À to HCO 4 À .( iii)A process with very large currents at > 1.2 Vo wing to the formation of Co V (CO 3 ) 3 À ,w hich oxidizes both water and HCO 3 À /CO 3 2À . Thesep rocesses depend on [Co II ], [NaHCO 3 ], andp H. Chronoamperometry at 1.3 Vg ives ag reen deposit. It acts as a heterogeneous catalystf or water oxidation. DFT calculations point out that Co n (CO 3 ) 3 nÀ6, n = 4, 5a re attainable at potentials similar to those experimentally observed.Scheme1.Outline of the water oxidation mechanisms. Misthe metal, n represents the highest oxidation state. [50] This figure has beenr eproduced (modified) from reference [50] with permission from the Royal Societyof Chemistry.

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Section: Resultsmentioning

confidence: 99%

Section: The First Wave Co Iii/iimentioning

confidence: 99%

Cobalt Carbonate as an Electrocatalyst for Water Oxidation

Patra

Illés

Mizrahi³

et al. 2019

Chemistry A European J

Self Cite

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“…Figure 8 B shows that the peak currents (I p ) had a good linear relationship with v 1/2 at a temperature of 25 °C. According to the Randles–Sevcik [ 32 ] equation (Equation (2)), the values of the effective surface area (A, cm 2 ) were calculated.

where D refers to the diffusion coefficient of the probe Fe(CN) 6 3−/4− , which is equal to 7.63 × 10 −6 cm 2 /s, as reported by [ 33 ]; c refers to the concentration of the probe Fe(CN) 6 3−/4− (mol/cm 3 ); and v refers to the scan rate (V/s).…”

Section: Resultsmentioning

confidence: 99%

An Amperometric Biomedical Sensor for the Determination of Homocysteine Using Gold Nanoparticles and Acetylene Black-Dihexadecyl Phosphate-Modified Glassy Carbon Electrode

Zhu

Zhang

et al. 2023

Micromachines

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A novel nanocomposite film composed of gold nanoparticles and acetylene black–dihexadecyl phosphate was fabricated and modified on the surface of a glassy carbon electrode through a simple and controllable dropping and electropolymerization method. The nanocomposite film electrode showed a good electrocatalytic response to the oxidation of homocysteine and can work as an amperometric biomedical sensor for homocysteine. With the aid of scanning electron microscopy, energy dispersive X-ray technology and electrochemical impedance spectroscopy, the sensing interface was characterized, and the sensing mechanism was discussed. Under optimal conditions, the oxidation peak current of homocysteine was linearly increased with its concentration in the range of 3.0 µmol/L~1.0 mmol/L, and a sensitivity of 18 nA/(μmol/L) was obtained. Furthermore, the detection limit was determined as 0.6 µmol/L, and the response time was detected as 3 s. Applying the nanocomposite film electrode for monitoring the homocysteine in human blood serum, the results were satisfactory.

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“…It can be oxidized to [Ru(phen) 3 ] 3+ and each coordinated ligand can be reduced reversibly by acceptance of one electron [3]. Further ligand reduction at more negative potentials is also possible [4]. In an ideal case, two sets of three one-electron transfers should be possible, i.e.…”

Section: Electrochemical Properties Of Ru(ii) Complexesmentioning

confidence: 99%

Electrochemical characterization of the artificial metalloenzyme papain-[(η6-arene)Ru(1,10-phenanthroline)Cl]+

Lachmanová

Pospı́šil

Šebera

et al. 2020

Journal of Electroanalytical Chemistry

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Electrochemical properties were studied for [(η 6 -arene)Ru(1,10-phenanthroline)Cl]Cl (arene = C 6 H 5 (CH 2 ) 2 NHCOCH 2 Cl) organometallic complex 1, protein Papain PAP and its conjugate with organometallic complex 1-PAP. The latter can serve as an artificial metalloenzyme with catalytic activity in transfer hydrogenation. This work demonstrates that AC voltammetry and electrochemical impedance spectroscopy can be used as fast tools to screen the catalytic ability of 1-PAP electrochemically by studies of the catalytic hydrogen evolution reaction (HER). Proteins are known to catalyze this process, but we have shown that additional HER signal associated with the catalytic activity of 1 is observed for its conjugate with Papain 1-PAP.

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Electrochemical behaviour of tris(1,10-phenanthroline)ruthenium(II) at a surface modified electrode. Electrocatalytic reduction of dioxygen

Cited by 5 publications

References 59 publications

Cobalt Carbonate as an Electrocatalyst for Water Oxidation

Cobalt Carbonate as an Electrocatalyst for Water Oxidation

An Amperometric Biomedical Sensor for the Determination of Homocysteine Using Gold Nanoparticles and Acetylene Black-Dihexadecyl Phosphate-Modified Glassy Carbon Electrode

Electrochemical characterization of the artificial metalloenzyme papain-[(η6-arene)Ru(1,10-phenanthroline)Cl]+

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