Electrocatalytic hydrogen evolution reaction with a supramolecular cobalt(II)phthalocyanine carrying four cobaloxime moieties

Özçeşmeci, İbrahim; Demir, Aykut; Akyüz, Duygu; Koca, Atıf; Gül, Ahmet

doi:10.1016/j.ica.2017.07.024

Cited by 40 publications

(14 citation statements)

References 31 publications

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“…reported a shift of overpotential from −780 mV on GCE to −440 mV after modification with reduced graphene oxide and CoPc composite in acidic conditions . Unsubstituted and cobaloxime substituted CoPc were explored towards HER activity and showed overpotential values of about −620 and −360 mV, respectively, in phosphate buffer containing 0.1 M LiClO 4 . The electrochemical activity in MPcs is primarily due to the redox‐active metal cation and the oxidation of macrocyclic ligand.…”

Section: Resultsmentioning

confidence: 87%

“…[30] Unsubstituted and cobaloxime substituted CoPc were explored towards HER activity and showed overpotential values of about À 620 and À 360 mV, respectively, in phosphate buffer containing 0.1 M LiClO 4 . [31] The electrochemical activity in MPcs is primarily due to the redox-active metal cation and the oxidation of macrocyclic ligand. The metal-free hydrogen phthalocyanine (H 2 Pc) does not possess any electrochemical activity towards water electrolysis.…”

Section: Resultsmentioning

confidence: 99%

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Solution Processable Transition Metal Phthalocyanine Nanofibres

Madhuri

John

2019

ChemistrySelect

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Solution processable organic functional materials are highly desirable for device fabrication and applications. The insoluble nature of unsubstituted metal phthalocyanines (MPcs) often limits their applications that demand solution based coating techniques. In this work, nano‐architectures of metal phthalocyanines with important transition metal ions, Mn, Fe, Co, Cu and Zn that are highly dispersible in polar organic solvents have been prepared through a simple chemical route and applied as electrode materials for electrochemical hydrogen evolution reaction (HER). The formation of different MPcs is confirmed through various techniques such as Raman spectrocopy, X‐ray diffraction and X‐ray photoelectron spectroscopy. The morphology of the synthesized MPcs has a fibre‐like structure with varying dimensions of 150–650 nm in width and 5–10 μm in length. These nanostructures are supramolecular self‐assemblies of individual macrocycle rings coming together to form fibre‐like structures through π‐π interactions and are highly ordered with β crystal phase. The obtained CuPc and CoPc nanofibre dispersion coated on to a glassy carbon electrode exhibited an onset potential of −250 and −290 mV and a Tafel slope of 120 and 107 mV dec−1, respectively, for HER and good stability up to 1000 cycles.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 99%

Solution Processable Transition Metal Phthalocyanine Nanofibres

Madhuri

John

2019

ChemistrySelect

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“…Acar et al demonstrated the effect of mono (pyridine-4-oxy)tri(tert-butyl) phthalocyaninato Co (II) and mono (pyridine-4-oxy)-hexa(hexyl)phthalocyaninato Co (II) in oxygen reduction reactions [30]. Özçeşmeci et al reported electrocatalytic hydrogen evolution reaction with a cobalt (II)phthalocyanine system bearing four cobaloxime moieties [31]. Cui et al showed the interesting application of amino functionalized Iron (II) phthalocyanine in direct methanol fuel cells [32].…”

Section: Regioisomers Of N 4 -Macrocyclic Complexesmentioning

confidence: 99%

Isomerism‐Activity Relation in Molecular Electrocatalysis: A Perspective

et al. 2020

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This perspective provides a brief overview on the role of isomerism of secondary‐sphere functionality in molecular electrocatalysis, without which there exists a clear knowledge‐gap in defining a molecule's structure‐activity relation. The discussion unfolds how isomerism of the functionality triggers short‐range interactions in the molecule leading to unprecedented events in electrocatalysis. This perspective highlights that the isomerism of substituents makes an independent contribution to electrocatalysis over its nature and for exploiting the maximum potential of the molecule in electrocatalysis, nature of the substituent as well as its isomerism should be given consideration.

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“…The most important advantage of phthalocyanines and metallo-derived phthalocyanines is that they can be modified with various functional groups and their physical, optical and electronic properties can be controlled (3). Metallo-phthalocyanines generally have been used as catalysts (4,5), as organic semiconductors in transistors (6), as photo-active material in laser printers (7), as photosensitizers in dye sensitized solar cells (8) and photodynamic cancer therapy (9). Recently, triazole substituted phthalocyanine complexes have attracted the attention due to their use in various applications fields such as materials science, agrochemistry, and medicinal chemistry (10,11).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and in-situ spectroelectrochemical behaviors of non-peripherally tetra substituted zinc(II) and magnesium(II) phthalocyanines

Çubukçu

2021

Journal of the Turkish Chemical Society Section A: Chemistry

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The electrochemical behaviors of non-peripherally tetra substituted zinc(II) and magnesium(II) phthalocyanines were studied at glassy carbon electrode in N,N-dimethylformamide using cyclic and square wave voltammetry techniques. Electrochemical mechanisms of complexes were illuminated by using the relationship between scan rate and peak current. The complexes exhibited reversible and diffusion controlled behaviors. The effect of metal center on redox properties of complexes were investigated and compared. Zinc and magnesium phthalocyanines showed three reduction redox pairs and one oxidation redox pair, which are similar with small differences in potential during electrochemical measurements. Electrochemical results were supported with in-situ spectroelectrochemical measurements. Moreover, the color changes were recorded and sharp color transitions were observed during the reduction and oxidation redox processes.

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Electrocatalytic hydrogen evolution reaction with a supramolecular cobalt(II)phthalocyanine carrying four cobaloxime moieties

Cited by 40 publications

References 31 publications

Solution Processable Transition Metal Phthalocyanine Nanofibres

Solution Processable Transition Metal Phthalocyanine Nanofibres

Isomerism‐Activity Relation in Molecular Electrocatalysis: A Perspective

Electrochemical and in-situ spectroelectrochemical behaviors of non-peripherally tetra substituted zinc(II) and magnesium(II) phthalocyanines

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