Phosphines in artificial photosynthesis: considering different aspects such as chromophores, water reduction catalysts (WRCs), water oxidation catalysts (WOCs), and dyads

2019 ◽  
Vol 3 (11) ◽  
pp. 2926-2953 ◽  
Author(s):  
J. Pann ◽  
H. Roithmeyer ◽  
W. Viertl ◽  
R. Pehn ◽  
M. Bendig ◽  
...  
Keyword(s):  
Complex Systems ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Phosphine Ligands ◽  
Coordination Complex ◽  
Oxidation Catalysts ◽  
Water Reduction ◽  
Stereoelectronic Properties ◽  
Reduction Catalysts

Coordination complex systems containing phosphine ligands are used in artificial photosynthesis utilizing their unique stereoelectronic properties. Mono-, di- and tetraphosphines act as optimized ligand systems for complexation.

Performance of enhanced DuBois type water reduction catalysts (WRC) in artificial photosynthesis – effects of various proton relays during catalysis

2019 ◽  
Vol 215 ◽  
pp. 141-161 ◽  
Author(s):  
Wolfgang Viertl ◽  
Johann Pann ◽  
Richard Pehn ◽  
Helena Roithmeyer ◽  
Marvin Bendig ◽  
...  
Keyword(s):  
Oxidation State ◽  
Artificial Photosynthesis ◽  
Metal Oxidation ◽  
Water Reduction ◽  
Coordination Site ◽  
Proton Relay ◽  
Additional Coordination ◽  
Type Water ◽  
Reduction Catalysts

A pincer type ligand provides an additional coordination site or a proton relay depending on the metal oxidation state.

scholarly journals Water Oxidation Catalysts: The Quest for New Oxide-Based Materials

Inorganics ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 29 ◽  
Author(s):  
Christos Mavrokefalos ◽  
Greta Patzke
Keyword(s):  
Water Oxidation ◽  
Fossil Fuels ◽  
Artificial Photosynthesis ◽  
Low Cost ◽  
Research Area ◽  
Catalyst Design ◽  
Oxidation Catalysts ◽  
Solar Water Splitting ◽  
Cost Efficient

The expected shortage of fossil fuels as well as the accompanying climate change are among the major challenges of the 21st century. A global shift to a sustainable energy landscape is, therefore, of utmost importance. Over the past few years, solar technologies have entered the energy market and have paved the way to replace fossil-based energy sources, in the long term. In particular, electrochemical solar-to-hydrogen technologies have attracted a lot of interest—not only in academia, but also in industry. Solar water splitting (artificial photosynthesis) is one of the most active areas in contemporary materials and catalysis research. The development of low-cost, efficient, and stable water oxidation catalysts (WOCs) remains crucial for artificial photosynthesis applications, because WOCs still represent a major economical and efficient bottleneck. In the following, we summarize recent advances in water oxidation catalysts development, with selected examples from 2016 onwards. This condensed survey demonstrates that the ongoing quest for new materials and informed catalyst design is a dynamic and rapidly developing research area.

High Surface Area MnO2 Nanomaterials Synthesized by Selective Cation Dissolution for Efficient Water Oxidation

2022 ◽  
Author(s):  
Ravi Kumar Kunchala ◽  
Pushpendra . ◽  
Rimple Kalia ◽  
Sanyasinaidu Boddu
Keyword(s):  
Solar Energy ◽  
Surface Area ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
High Surface ◽  
High Surface Area ◽  
Promising Method ◽  
Chemical Energy ◽  
Oxidation Catalysts

Artificial photosynthesis is a promising method that directly transforms solar energy into chemical energy. To achieve artificial photosynthesis, efficient water oxidation catalysts (WOCs) are essential. In nature, the manganese-oxo-calcium cluster...

scholarly journals Mechanisms of Photoisomerization and Water Oxidation Catalysis of Ruthenium(II) Aquo Complexes

2021 ◽  
Author(s):  
Yuta Tsubonouchi ◽  
Eman A. Mohamed ◽  
Zaki N. Zahran ◽  
Masayuki Yagi
Keyword(s):  
Physicochemical Properties ◽  
Water Oxidation ◽  
Recent Progress ◽  
Artificial Photosynthesis ◽  
Ruthenium Complexes ◽  
Oxidation Catalysis ◽  
Oxidation Catalysts ◽  
Water Oxidation Catalysis ◽  
Molecular Catalysts ◽  
Insight Into

Polypyridyl ruthenium(II) complexes have been widely researched as promising functional molecules. We have found unique photoisomerization reactions of polypyridyl ruthenium(II) aquo complexes. Recently we have attempted to provide insight into the mechanism of the photoisomerization of the complexes and distinguish between the distal−/proximal-isomers in their physicochemical properties and functions. Moreover, polypyridyl ruthenium(II) aquo complexes have been intensively studied as active water oxidation catalysts (WOCs) which are indispensable for artificial photosynthesis. The catalytic aspect and mechanism of water oxidation by the distal-/proximal-isomers of polypyridyl ruthenium(II) aquo complexes have been investigated to provide the guided thought to develop more efficient molecular catalysts for water oxidation. The recent progress on the photoisomerization and water oxidation of polypyridyl ruthenium(II) aquo complexes in our group are reviewed to understand the properties and functions of ruthenium complexes.

Water Oxidation Catalysts for Artificial Photosynthesis

2019 ◽  
Vol 31 (50) ◽  
pp. 1902069 ◽  
Author(s):  
Sheng Ye ◽  
Chunmei Ding ◽  
Mingyao Liu ◽  
Aoqi Wang ◽  
Qinge Huang ◽  
...  
Keyword(s):  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Oxidation Catalysts

Revisiting Dinuclear Ruthenium Water Oxidation Catalysts: Effect of Bridging Ligand Architecture on Catalytic Activity

2021 ◽  
Vol 60 (3) ◽  
pp. 1806-1813
Author(s):  
Husain N. Kagalwala ◽  
Mahesh S. Deshmukh ◽  
Elamparuthi Ramasamy ◽  
Neelima Nair ◽  
Rongwei Zhou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Bridging Ligand ◽  
Dinuclear Ruthenium

Heterogeneous Water Oxidation Catalysts for Molecular Anodes and Photoanodes

Solar RRL ◽  
2021 ◽  
Author(s):  
Matthew V. Sheridan ◽  
Benjamin D. Sherman ◽  
Yi Xie ◽  
Ying Wang
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalysts

scholarly journals Design of Molecular Water Oxidation Catalysts Stabilized by Ultrathin Inorganic Overlayers—Is Active Site Protection Necessary?

Inorganics ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 105 ◽  
Author(s):  
Laurent Sévery ◽  
Sebastian Siol ◽  
S. Tilley
Keyword(s):  
Water Oxidation ◽  
Atomic Layer ◽  
Deposition Process ◽  
Operating Conditions ◽  
Molecular Water ◽  
Side Reactions ◽  
Aqueous Environment ◽  
Oxidation Catalysts ◽  
Initial Onset ◽  
Anchoring Groups

Anchored molecular catalysts provide a good step towards bridging the gap between homogeneous and heterogeneous catalysis. However, applications in an aqueous environment pose a serious challenge to anchoring groups in terms of stability. Ultrathin overlayers embedding these catalysts on the surface using atomic layer deposition (ALD) are an elegant solution to tackle the anchoring group instability. The propensity of ALD precursors to react with water leads to the question whether molecules containing aqua ligands, such as most water oxidation complexes, can be protected without side reactions and deactivation during the deposition process. We synthesized two iridium and two ruthenium-based water oxidation catalysts, which contained an aqua ligand (Ir–OH2 and Ru–OH2) or a chloride (Ir–Cl and Ru–Cl) that served as a protecting group for the former. Using a ligand exchange reaction on the anchored and partially embedded Ru–Cl, the optimal overlayer thickness was determined to be 1.6 nm. An electrochemical test of the protected catalysts on meso-ITO showed different behaviors for the Ru and the Ir catalysts. The former showed no onset difference between protected and non-protected versions, but limited stability. Ir–Cl displayed excellent stability, whilst the unprotected catalyst Ir–OH2 showed a later initial onset. Self-regeneration of the catalytic activity of Ir–OH2 under operating conditions was observed. We propose chloride ligands as generally applicable protecting groups for catalysts that are to be stabilized on surfaces using ALD.

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