Mononuclear bis(dimethylglyoximato)ruthenium(III) complexes with different appended axial groups: highly efficient catalysts for water oxidation

Khán, M.M.Taqui; Ramachandraiah, G.; Mehta, S.H.; Abdi, Sayed H. R.; Kumar, S Sanal

doi:10.1016/0304-5102(90)85039-k

Cited by 16 publications

(2 citation statements)

References 10 publications

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“…Subsequently, in the last 30 years, a tremendous amount of work has been conducted in order to develop robust and efficient catalysts for water oxidation. Initially, research on water splitting by a molecular catalyst has focused on noble metals complexes such as Ru − and Ir − due to their high activity and robustness. Nonetheless, investigations have shown that under certain conditions, these “robust” complexes can decompose into metal oxide catalysts. − This is particularly notable in the case of Ir due to the high activity of the IrOx as catalyst for water oxidation but also due to the difficulty in detecting these metal oxide particles. , Similarly, catalysts based on first-row transition-metal complexes, such as Mn, − Fe, , Co, Ni, − and Cu, − have recently been developed for the sake of cost-effectiveness.…”

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confidence: 99%

Re-Investigation of Cobalt Porphyrin for Electrochemical Water Oxidation on FTO Surface: Formation of CoOx as Active Species

et al. 2017

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The use of cobalt porphyrin complexes as efficient and cost-effective molecular catalysts for water oxidation has been investigated previously. However, by combining a set of analytical techniques (electrochemistry, ultraviolet–visible spectroscopy (UV–vis), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and synchrotron-based photoelectron spectroscopy (SOXPES and HAXPES)), we have demonstrated that three different cobalt porphyrins, deposited on FTO glasses, decompose promptly into a thin film of CoOx on the surface of the electrode during water oxidation under certain conditions (borate buffer pH 9.2). It is presumed that the film is composed of CoO, only detectable by SOXPES, as conventional techniques are ineffective. This newly formed film has a high turnover frequency (TOF), while the high transparency of the CoOx-based electrode is very promising for future application in photoelectrochemical cells.

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confidence: 99%

Re-Investigation of Cobalt Porphyrin for Electrochemical Water Oxidation on FTO Surface: Formation of CoOx as Active Species

et al. 2017

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“…This belief was largely motivated by structural elucidation of the oxygen-evolving complex in photosystem II that revealed a multi-metallic Mn cluster as the active catalyst. The success achieved by the blue dimer contrasted with the poor or non-existent catalytic activity of mono-nuclear Ru complexes [25,60,61,62,63,64,65,66,67] further propagated the perception that at least two metal sites were necessary to support the multiple oxidizing equivalents required for water oxidation. However, in 2005, Zong and Thummel reported competent water oxidation by a series of mono-nuclear Ru complexes bearing a 2,6-di(1,8-naphthyridin-2-yl)pyridine backbone, a bound water molecule, and varying pyridyl axial groups ( 6a – c , Figure 6) [59].…”

Section: A Brief History and Mini-review Of Ru-based Homogeneous Wmentioning

confidence: 99%

An Overview of Significant Achievements in Ruthenium-Based Molecular Water Oxidation Catalysis

Kamdar

Grotjahn

2019

Molecules

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Fossil fuels (coal, oil, natural gas) are becoming increasingly disfavored as long-term energy options due to concerns of scarcity and environmental consequences (e.g., release of anthropogenic CO2). Hydrogen gas, on the other hand, has gained popularity as a clean-burning fuel because the only byproduct from its reaction with O2 is H2O. In recent decades, hydrogen derived from water splitting has been a topic of extensive research. The bottleneck of the water splitting reaction is the difficult water oxidation step (2H2O → O2 + 4H+ + 4e−), which requires an effective and robust catalyst to overcome its high kinetic barrier. Research in water oxidation by molecular ruthenium catalysts enjoys a rich history spanning nearly 40 years. As the diversity of novel ligands continues to widen, the relationship between ligand geometry or electronics, and catalyst activity is undoubtedly becoming clearer. The present review highlights, in the authors’ opinion, some of the most impactful discoveries in the field and explores the evolution of ligand design that has led to the current state of the art.

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Molekulare Katalysatoren für die Oxidation von Wasser zu Disauerstoff

et al. 2009

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Wasseroxidation: Ein guter Katalysator für die Umsetzung von Wasser zu Sauerstoff ist für die nachhaltige Umwandlung von Sonnenenergie essenziell. Die Schlüsselfaktoren für die Leistungsfähigkeit erfolgreicher molekularer Katalysatoren und die Notwendigkeit für ein katalytisches System auf Festkörperbasis werden erläutert, und die ersten Versuche, molekulare Katalysatoren für die Wasseroxidation auf Trägermaterial herzustellen, werden analysiert. In den letzten vier Jahren wurden wir Zeugen einer Revolution auf dem Gebiet der katalytischen Wasseroxidation: Definierte Moleküle eröffnen neue Möglichkeiten, robustere und effizientere Katalysatoren maßzuschneidern. Angestoßen wurde diese Revolution durch zwei Faktoren: den dringenden Bedarf an sauberen und erneuerbaren Kraftstoffen und das dem Menschen innewohnende Verlangen, die Reaktionen der Natur nachzuahmen – in diesem Fall die des sauerstofferzeugenden Komplexes (OEC) des Photosystems II (PSII). Im Folgenden geben wir einen kurzen Überblick über die wohlbekannten Grundlagen der Oxidation von Wasser zu Disauerstoff und präsentieren anschließend die neuen Entwicklungen auf diesem Forschungsfeld, die neuen Ansätze, Katalysatordesign und ‐leistung zu verbessern, und die Fragen, die diese Entwicklungen insbesondere aus mechanistischer Sicht aufwerfen. Schließlich werden wir noch die Herausforderungen diskutieren, denen sich das Forschungsfeld gegenübersieht.

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Mononuclear bis(dimethylglyoximato)ruthenium(III) complexes with different appended axial groups: highly efficient catalysts for water oxidation

Cited by 16 publications

References 10 publications

Re-Investigation of Cobalt Porphyrin for Electrochemical Water Oxidation on FTO Surface: Formation of CoOx as Active Species

Re-Investigation of Cobalt Porphyrin for Electrochemical Water Oxidation on FTO Surface: Formation of CoOx as Active Species

An Overview of Significant Achievements in Ruthenium-Based Molecular Water Oxidation Catalysis

Molekulare Katalysatoren für die Oxidation von Wasser zu Disauerstoff

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