Biphenyl appended non-noble metal complexes as electrocatalysts for the electrochemical oxygen reduction reaction

Junaid, Qazi Mohammad; Singh, Devesh Kumar; Ganesan, Vellaichamy; Sabiah, Shahulhameed

doi:10.1016/j.ica.2022.120822

Cited by 4 publications

(7 citation statements)

References 31 publications

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“…However, the H 2 O 2 could be an alternative to O 2 as an oxidant in the development of new fuel cells such as the single compartment hydrogen peroxide fuel cells, where the H 2 O 2 acts as both fuel and oxidizer [26]. The mononuclear arrangements promote the 2-electrons pathway in alkaline media as it was reported for the heterogeneous catalysts [Cu(heimp) 2 ] [27] and [Cu(L) (TfO)] [28]. Moreover, the binuclear [Cu 2 (addpa) (CH 3 CN) 2 (ClO 4 ) 2 ](ClO 4 ) 2 complex also exhibits an ORR mechanism via 2-electrons in homogenous phase [29].…”

Section: Mononuclear Cu-catalysts For Orrmentioning

confidence: 96%

Strategies to improve the catalytic activity and stability of bioinspired Cu molecular catalysts for the ORR

Muñoz‐Becerra

Zagal

Venegas

et al. 2022

Current Opinion in Electrochemistry

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Section: Mononuclear Cu-catalysts For Orrmentioning

confidence: 96%

Strategies to improve the catalytic activity and stability of bioinspired Cu molecular catalysts for the ORR

Muñoz‐Becerra

Zagal

Venegas

et al. 2022

Current Opinion in Electrochemistry

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“…Accordingly, studies on ORR activity and selectivity of different transition metals in the new coordination environment of ligands (like, C 2 ‐symmetric bissulfoximine ligands in the present work whose electrocatalytic efficiency for the ORR are not explored) are necessary. Moreover, most ORR catalytic studies are executed by integrating the active sites on conducting carbon supports [6–10] . Since the carbon materials themselves may work as ORR catalysts, there are chances to wrongly interpret the difference in the ORR activity of different transition metal active sites to the carbon supports.…”

Section: Introductionmentioning

confidence: 99%

“…In our recent research, we have reported the ORR activity of quinoline‐based metal complexes [10] . As a different N‐donor scaffold, herein, we focused on the electrocatalytic activity of sulfoximine‐based metal complexes for the ORR.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, most ORR catalytic studies are executed by integrating the active sites on conducting carbon supports. [6][7][8][9][10] Since the carbon materials themselves may work as ORR catalysts, there are chances to wrongly interpret the difference in the ORR activity of different transition metal active sites to the carbon supports. Therefore, in the present work, the ORR activity of iron, cobalt, nickel, and copper in a sulfoximine ligand environment is compared without the carbon supports.…”

Section: Introductionmentioning

confidence: 99%

“…In our recent research, we have reported the ORR activity of quinoline-based metal complexes. [10] As a different N-donor scaffold, herein, we focused on the electrocatalytic activity of sulfoximine-based metal complexes for the ORR. Consequently, we synthesized a new type of bissulfoximine pincer ligand by coupling diphenylsulfoximine with 2,6-bis(bromomethyl)pyridine.…”

Section: Introductionmentioning

confidence: 99%

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C₂‐Symmetric Bissulfoximine‐Based Metal Complexes: Synthesis, Characterization and Their Electrocatalytic Activity in Oxygen Reduction Reaction

Junaid

Singh

Ganesan

et al. 2022

Chemistry An Asian Journal

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Sulfoximine‐based metal complexes have gained much interest in recent years owing to their promising properties in synthetic organic chemistry. These sulfoximines have been recently introduced in the field of organometallics. However, the coordination properties of pincer sulfoximine ligands and their metal complexes have not been reported. Here, a C2‐symmetric bissulfoximine‐based pincer ligand ((pyridine‐2,6‐diylbis(methylene))bis(azaneylylidene))bis(diphenyl‐λ6‐sulfanone), namely S‐P ligand and its metal [M(SP)2]2+ {M=Fe (SC‐1), Co (SC‐2), Ni (SC‐3), Cu (SC‐4)} complexes, were synthesized. The complexes were characterized by different spectroscopic techniques like UV‐Vis, IR, NMR, ESI‐MS, and single‐crystal XRD. Complexes SC‐1 and SC‐3 exhibited octahedral geometry irrespective of the metal center. The complexes were systematically explored for electrocatalytic oxygen reduction reaction (ORR) by immobilizing them on a glassy carbon electrode using Nafion. These complexes showed selective two‐electron catalytic reduction of O2 to H2O2 in which complex SC‐2 showed the highest selectivity (≈90%) and complex SC‐4 showed the highest onset potential (0.75 V).

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Metal Centers Drive Selectivity of Electrocatalytic Oxygen Reduction Reaction Promoted by Tetrapyrazinoporphyrazine Complexes

Sordello,

Azzi,

Pellegrino

et al. 2024

Advanced Sustainable Systems

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Fuel cells represent a promising technology for the future decarbonization of the mobility sector. However, the efficient use of H2 and O2 to produce electricity still requires noble metal catalysts such as platinum and ruthenium. In particular, the Oxygen Reduction Reaction (ORR) is complex and limiting due to its mechanism, which involves the transfer of four electrons and four protons to produce water. The search for alternative catalysts exhibiting high selectivity is progressing at a rapid pace. In this context, this group previously unveiled a homogeneous catalyst based on titanium‐centered tetrapyrazinoporphyrazines (TPyzPz) for the ORR, noting a certain modularity in the selectivity toward either a two‐ or four‐electron reduction reaction. In this study, the influence of different metal centers (magnesium (Mg), cobalt (Co), copper (Cu), and zinc (Zn)) and various substituents is investigated on the tetrapyrazinoporphyrazine ring. The findings indicate a strong dependence of activity and selectivity on these modifications. Notably, cobalt and copper catalysts exhibit a selectivity greater than 90% toward H2O production in the ORR. However, alterations to the macrocycle structure significantly affected the reactivity of these catalysts. These new insights highlighted the importance of careful structural design in the development of the next generation of ORR catalysts.

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Biphenyl appended non-noble metal complexes as electrocatalysts for the electrochemical oxygen reduction reaction

Cited by 4 publications

References 31 publications

Strategies to improve the catalytic activity and stability of bioinspired Cu molecular catalysts for the ORR

Strategies to improve the catalytic activity and stability of bioinspired Cu molecular catalysts for the ORR

C₂‐Symmetric Bissulfoximine‐Based Metal Complexes: Synthesis, Characterization and Their Electrocatalytic Activity in Oxygen Reduction Reaction

Metal Centers Drive Selectivity of Electrocatalytic Oxygen Reduction Reaction Promoted by Tetrapyrazinoporphyrazine Complexes

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Biphenyl appended non-noble metal complexes as electrocatalysts for the electrochemical oxygen reduction reaction

Cited by 4 publications

References 31 publications

Strategies to improve the catalytic activity and stability of bioinspired Cu molecular catalysts for the ORR

Strategies to improve the catalytic activity and stability of bioinspired Cu molecular catalysts for the ORR

C2‐Symmetric Bissulfoximine‐Based Metal Complexes: Synthesis, Characterization and Their Electrocatalytic Activity in Oxygen Reduction Reaction

Metal Centers Drive Selectivity of Electrocatalytic Oxygen Reduction Reaction Promoted by Tetrapyrazinoporphyrazine Complexes

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C₂‐Symmetric Bissulfoximine‐Based Metal Complexes: Synthesis, Characterization and Their Electrocatalytic Activity in Oxygen Reduction Reaction