Zeolite-encapsulated M(Co,Fe,Mn)(SALEN) complexes modified glassy carbon electrodes and their application in oxygen reduction

Zhang, Rong; Ma, Jinghong; Wang, Qianqian; Wang, Baocheng; Li, Ruifeng

doi:10.1016/j.jelechem.2010.03.012

Cited by 50 publications

(12 citation statements)

References 65 publications

(81 reference statements)

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“…Hence, to confirm the nature of electron transport in the encapsulated complexes, voltammograms were recorded over a period of time at a scan rate of 0.1 V. Several other groups have reported that if the electron transfer occurs via an extra-zeolite mechanism, the zeolite modified electrode (ZME) results in a drastic decrease in peak currents over minutes. 41,42 In the present case, peak currents obtained at ZME were found to be stable up to several hours and did not vanish up to a number of cycles (we recorded up to 50 cycles). This behavior a The values (in cm −1 ) given in the parentheses are for encapsulated complexes.…”

Section: ■ Results and Discussionsupporting

confidence: 39%

Electronic, Conjugation, and Confinement Effects on Structure, Redox, and Catalytic Behavior of Oxido-Vanadium(IV) and -(V) Chiral Schiff Base Complexes

et al. 2015

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Change in oxophilicity, redox, and catalytic behavior with the modification of ligand system was observed for four oxido-vanadium Schiff base complexes. Mononuclear V(IV) complexes were obtained with methyl-substituted Schiff base ligand and one having higher conjugation. Electronic and conjugation effects reduce the oxophilicity of vanadium and led to mononuclear (LV IV O, L = Schiff base ligand) species. However, μ-oxido bridged dinuclear [OV V OL] 2 complexes were formed with Schiff base ligands without such electronic effect under identical condition. Such structural variation also changed the electronic and redox properties of the metal complexes and brought about substantial differences in the catalytic activities of the vanadium Schiff base complexes. Confinement effect imparted by the zeolite-Y framework on the metal complexes synthesized inside the cavity by the "ship in a bottle synthesis" method was also found to alter the catalytic behavior of the metal complexes. All of the mononuclear and μ-oxido bridged dinuclear vanadium Schiff base complexes were found to give moderate to high enantioselectivity in epoxidation of styrene and oxidative coupling of 2-naphthol. Zeolite-Y encapsulated complexes however were found to show better catalytic activity than the mononuclear homogeneous catalyst but less than the dinuclear species. Catalytic activities of the complexes were found to depend on rate of oxygen flow, temperature, solvent, and the amount of catalyst. Change in redox potentials due to electronic, conjugation, and confinement effect highly influenced the catalytic behavior of the metal complexes. The lower was the oxidation potential, the higher was the catalytic activity. The best results for epoxidation of styrene were observed at −15 °C, while a maximum amount of BINOL was achieved at 0 °C. All of the chiral catalysts were found to be more effective in epoxidation of styrene. As compared to the homogeneous chiral catalyst, zeolite-Y embedded chiral catalysts were found to be advantageous in terms of recyclability, easy separation, and in some cases higher enantioselectivity.

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Section: ■ Results and Discussionsupporting

confidence: 39%

Electronic, Conjugation, and Confinement Effects on Structure, Redox, and Catalytic Behavior of Oxido-Vanadium(IV) and -(V) Chiral Schiff Base Complexes

et al. 2015

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“…The response of peak current intensity was fitted with scan rate and the following equation was obtained: j (mA cm –2 ) = −0.012 – 0.502 V ( V ) ( R 2 = 0.992) (Figure d). The excellent linear relationship between the scan rate and the reduction peak current indicates absorption-controlled nonenzymatic H 2 O 2 monitoring. − …”

Section: Resultsmentioning

confidence: 94%

Flexible Active-Site Engineering of Monometallic Co-Layered Double Hydroxides for Achieving High-Performance Bifunctional Electrocatalyst toward Oxygen Evolution and H₂O₂ Reduction

Chen

Ding

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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It is highly desirable but challenging to develop a facile and scalable strategy to synthesize efficient bifunctional electrocatalysts for oxygen evolution and H 2 O 2 reduction by engineering the active site of monometallic-layered double hydroxides (LDHs). Herein, we developed a convenient, efficient, and scalable method for the construction of monometallic Co-LDHs with tunable Co n+ (n = 2, 3) concentration by a one-pot solvothermal reaction in a short time (e.g., 2 and 4 h) using only cobalt nitrate and hexamine as raw materials. The catalytic performance of Co-LDHs was mainly determined by the Co n+ (n = 2, 3) concentration, which could be simply regulated by tuning the solvothermal time. Combining the joint merits of three-dimensional flowerlike architecture (abundant accessible active sites and a fast electron/mass transport), Co-LDHs-4 with abundant Co 3+ species exhibited an excellent electrocatalytic activity for oxygen evolution reaction in terms of a low overpotential at 10 mA cm −2 (η 10 = 241 mV) and long-term durability for 70 h at 100 mA cm −2 , better than the state-of-the-art IrO 2 and most of the reported analogues. Besides, Co-LDHs-2 enriched in Co 2+ displayed a superior electrochemical activity for H 2 O 2 detection with a broad linear range (0.002−20 mM), a low detection limit (0.002 mM), and a high response sensitivity (272.02 μA mM −1 cm −2 ). Therefore, this work opens a new horizon for the rational development of a highly active electrocatalyst with tunable concentrations of active components.

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“…Manganese(III), iron(III), cobalt(II), and ruthenium(III)-Schiff base complexes are mainly used in indirect electroreductions of halohydrocarbons [29,30] or molecular oxygen [31][32][33][34][35][36] in order to epoxide olefins or to oxidize hydrocarbons. These reactions using electrocatalytic systems could be performed in homogeneous as well as in heterogeneous catalysis.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Electrochemical Study of Tetradentate Ruthenium‐Schiff Base Complexes: Dioxygen Activation with a Cytochrome P450 Model Using 1‐ or 2‐Methylimidazole as Axial Bases

Ourari

Khelafi

Aggoun

et al. 2011

Advances in Physical Chemistry

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Salicylaldehyde, 2-hydroxyacetophenone, and 3,5-dichlorosalicylaldehyde react with 1,2-diaminoethane to give three symmetrical Schiff bases H 2 L 1 , H 2 L 2 , and H 2 L 3 , respectively. With Ru(III) ions, these ligands lead to three complexes: Ru(III)ClL 1 (1), Ru(III)ClL 2 (2), and Ru(III)ClL 3 (3). The purity of these compounds was estimated by TLC technique and microanalysis while their structures were supported by the usual spectroscopic methods such as NMR, infrared, and electronic spectra. The cyclic voltammetry in acetonitrile showed irreversible waves for all three ligands. Under the same experimental conditions, it was proved that the ruthenium is coordinated in the three complexes 1, 2, and 3 showing quasireversible redox systems. The behavior of these complexes and their comparison with cytochrome P450 are investigated using them as catalysts in the presence of molecular oxygen with an apical nitrogen base: 1-or 2-methylimidazole.

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Zeolite-encapsulated M(Co,Fe,Mn)(SALEN) complexes modified glassy carbon electrodes and their application in oxygen reduction

Cited by 50 publications

References 65 publications

Electronic, Conjugation, and Confinement Effects on Structure, Redox, and Catalytic Behavior of Oxido-Vanadium(IV) and -(V) Chiral Schiff Base Complexes

Electronic, Conjugation, and Confinement Effects on Structure, Redox, and Catalytic Behavior of Oxido-Vanadium(IV) and -(V) Chiral Schiff Base Complexes

Flexible Active-Site Engineering of Monometallic Co-Layered Double Hydroxides for Achieving High-Performance Bifunctional Electrocatalyst toward Oxygen Evolution and H₂O₂ Reduction

Synthesis, Characterization, and Electrochemical Study of Tetradentate Ruthenium‐Schiff Base Complexes: Dioxygen Activation with a Cytochrome P450 Model Using 1‐ or 2‐Methylimidazole as Axial Bases

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Zeolite-encapsulated M(Co,Fe,Mn)(SALEN) complexes modified glassy carbon electrodes and their application in oxygen reduction

Cited by 50 publications

References 65 publications

Electronic, Conjugation, and Confinement Effects on Structure, Redox, and Catalytic Behavior of Oxido-Vanadium(IV) and -(V) Chiral Schiff Base Complexes

Electronic, Conjugation, and Confinement Effects on Structure, Redox, and Catalytic Behavior of Oxido-Vanadium(IV) and -(V) Chiral Schiff Base Complexes

Flexible Active-Site Engineering of Monometallic Co-Layered Double Hydroxides for Achieving High-Performance Bifunctional Electrocatalyst toward Oxygen Evolution and H2O2 Reduction

Synthesis, Characterization, and Electrochemical Study of Tetradentate Ruthenium‐Schiff Base Complexes: Dioxygen Activation with a Cytochrome P450 Model Using 1‐ or 2‐Methylimidazole as Axial Bases

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Flexible Active-Site Engineering of Monometallic Co-Layered Double Hydroxides for Achieving High-Performance Bifunctional Electrocatalyst toward Oxygen Evolution and H₂O₂ Reduction