scholarly journals Synthesis of an amorphous Geobacter-manganese oxide biohybrid as an efficient water oxidation catalyst

2020 ◽  
Vol 22 (17) ◽  
pp. 5610-5618
Author(s):  
Shafeer Kalathil ◽  
Krishna P. Katuri ◽  
Pascal E. Saikaly
Keyword(s):  
Manganese Oxide ◽  
Water Oxidation ◽  
Geobacter Sulfurreducens ◽  
Oxidation Catalyst ◽  
Oxidation Catalysts

Self-decorated Mn2O3 nanocrystals on Geobacter sulfurreducens were synthesized as sustainable and efficient water oxidation catalysts.

scholarly journals Understanding the performance of a bisphosphonate Ru water oxidation catalyst

2020 ◽  
Vol 49 (40) ◽  
pp. 14052-14060
Author(s):  
Jesús A. Luque-Urrutia ◽  
Jayneil M. Kamdar ◽  
Douglas B. Grotjahn ◽  
Miquel Solà ◽  
Albert Poater
Keyword(s):  
Water Oxidation ◽  
Clean Energy ◽  
Oxidation Catalyst ◽  
Oxidation Catalysts

Water oxidation catalysts (WOCs) are a key part of generating H2 from water and sunlight, consequently, it is a promising process for the production of clean energy.

Inside Back Cover: Scalable Synthesis of Efficient Water Oxidation Catalysts: Insights into the Activity of Flame-Made Manganese Oxide Nanocrystals (ChemSusChem 24/2015)

ChemSusChem ◽  
2015 ◽  
Vol 8 (24) ◽  
pp. 4275-4275
Author(s):  
Guanyu Liu ◽  
Jeremy Hall ◽  
Noushin Nasiri ◽  
Thomas Gengenbach ◽  
Leone Spiccia ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Back Cover ◽  
Scalable Synthesis

(Invited) Visible Light-Driven Water Oxidation with Porphyrin Sensitizers and Water Oxidation Catalysts

2018 ◽  
Vol MA2018-01 (31) ◽  
pp. 1852-1852
Author(s):  
Hiroshi Imahori
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Water Oxidation ◽  
Light Harvesting ◽  
Visible Region ◽  
Oxidation Catalyst ◽  
Efficient Production ◽  
Oxidation Catalysts ◽  
Visible Light Driven ◽  
Artificial Photosynthetic

Exporing renewable energy sources is an important task in making our society sustainable. In this regard, use of sunlight as an infinite energy source is fascinating. Specifically, realizing artificial photosynthesis, i.e., integration of light-harvesting, multi-step electron and proton transfer, and water oxidation for the efficient production of solar fuels, is a great challenge in chemistry. For the purpose, dye-sensitized photoelectrosynthesis cells (DSPSC) have been investigated, as the heterogeneous water splitting on inorganic semiconductors is promising for the upcoming large scale device operation. In DSPSC a molecular sensitizer adsorbed on a semiconducting electrode harvests visible light and injects an electron from the excited-state of the sensitizer (S*) to a conduction band (CB) of the electrode. Then, the sensitizer radical cation (S• +) extracts an electron from a water oxidation catalyst (WOC) to regenerate the sensitizer and one-electron oxidized WOC. After reiterating the cycle, high oxidation states of the WOC are produced, eventually transforming two water molecules into four protons and one oxygen molecule. As the sensitizer bis(2,2’-bipyridine)(4,4’-diphosphonato-2,2’-bipyridine)ruthenium(II) (RuP) has been frequently employed for the construction of molecule-based artificial photosynthetic systems, owing to its sufficient first oxidation potential for water oxidation and a long lifetime of its excited state for electron injection. However, the light-harvesting ability of RuP is rather low in visible region beyond 500 nm. Considering that yellow to red photons mainly shower down on the earth from sun, use of photons in visible region is essential for efficient chemical conversion by sunlight. In this context, porphyrins are attractive as the sensitizer due to their excellent light-harvesting in visible region and facile tuning of their excited-states and redox properties by their chemical functionalization. Nevertheless, molecule-based artificial photosynthetic systems with porphyrins as the sensitizer have been very limited as the result of their poor performance. One plausible reason is the occurrence of fast charge recombination (CR) between the electron injected into the CB of TiO2 (denoted as TiO2(e−)) and S• +. CR from TiO2(e−) to the oxidized WOC would also take place within a few microsecond. Undesirable CR from TiO2(e−) to water is indicated. Thus, to overcome the disadvantages, it is crucial to optimize the electron transfer (ET) processes at the interfaces. In this talk, I will give an overview of our recent initiatives on visible light-driven water oxidation with novel porphyrin sensitizers and water oxidation catalysts. [1] M. Yamamoto, L. Wang, F. Li, T. Fukushima, K. Tanaka, L. Sun and H. Imahori, Chem. Sci., 7, 1430-1439 (2016). [2] M. Yamamoto, Y. Nishizawa, P. Chábera, F. Li, T. Pascher, V. Sundström, L. Sun, and H. Imahori, Chem. Commun., 52, 13702-13705 (2016). [3] M. Yamamoto, J. Föhlinger, J. Petersson, L. Hammarström, and H. Imahori, Angew. Chem. Int. Ed., 56, 3329-3333 (2017).

scholarly journals Periodate – an alternative oxidant for testing potential water oxidation catalysts

2016 ◽  
Vol 4 (8) ◽  
pp. 2863-2872 ◽  
Author(s):  
Andrew Mills ◽  
David Hazafy ◽  
Sofia Elouali ◽  
Christopher O'Rourke
Keyword(s):  
Water Oxidation ◽  
Oxidation Catalyst ◽  
Rapid Screening ◽  
Oxidation Catalysts ◽  
Testing Potential

Periodate is used as an alternative oxidant in the rapid screening of new potential water oxidation catalyst material powders.

scholarly journals P4VP–RuII(bda) polyelectrolyte–metal complex as water oxidation catalyst: on the unique slow-diffusion and multi-charge effects of the polyelectrolyte ligand

RSC Advances ◽  
2018 ◽  
Vol 8 (68) ◽  
pp. 38818-38830 ◽  
Author(s):  
Tao Zheng ◽  
Mo Zhu ◽  
Muhammad Waqas ◽  
Ahmad Umair ◽  
Muhammad Zaheer ◽  
...  
Keyword(s):  
Metal Complex ◽  
Water Oxidation ◽  
Catalytic Mechanism ◽  
Oxidation Catalyst ◽  
Oxidation Catalysts ◽  
Charge Effects ◽  
Slow Diffusion

This work shows how the unique slow diffusion and multi-charge properties of the polyelectrolyte ligand dominate the catalytic mechanism for water oxidation catalysts.

Scalable Synthesis of Efficient Water Oxidation Catalysts: Insights into the Activity of Flame-Made Manganese Oxide Nanocrystals

ChemSusChem ◽  
2015 ◽  
Vol 8 (24) ◽  
pp. 4162-4171 ◽  
Author(s):  
Guanyu Liu ◽  
Jeremy Hall ◽  
Noushin Nasiri ◽  
Thomas Gengenbach ◽  
Leone Spiccia ◽  
...  
Keyword(s):  
Manganese Oxide ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Scalable Synthesis

scholarly journals Decoration of the layered manganese oxide birnessite with Mn(ii/iii) gives a new water oxidation catalyst with fifty-fold turnover number enhancement

2015 ◽  
Vol 44 (29) ◽  
pp. 12981-12984 ◽  
Author(s):  
Ian G. McKendry ◽  
Sandeep K. Kondaveeti ◽  
Samantha L. Shumlas ◽  
Daniel R. Strongin ◽  
Michael J. Zdilla
Keyword(s):  
Manganese Oxide ◽  
Oxidation State ◽  
Water Oxidation ◽  
Oxidation Catalysis ◽  
Oxidation Catalyst ◽  
Turnover Number ◽  
Average Oxidation State ◽  
Water Oxidation Catalysis ◽  
Layered Manganese Oxide

The role of the manganese average oxidation state (AOS) in water oxidation catalysis by birnessite was investigated.

scholarly journals Stability of organic compounds on the oxygen-evolving center of photosystem II and manganese oxide water oxidation catalysts

2016 ◽  
Vol 52 (95) ◽  
pp. 13760-13763 ◽  
Author(s):  
Toru Hayashi ◽  
Akira Yamaguchi ◽  
Kazuhito Hashimoto ◽  
Ryuhei Nakamura
Keyword(s):  
Photosystem Ii ◽  
Manganese Oxide ◽  
Organic Compounds ◽  
Water Oxidation ◽  
Carboxyl Groups ◽  
Oxidation Catalysts ◽  
Oxygen Evolving ◽  
Mn Oxides

Carboxyl groups, abundant residues around the Mn4cluster of photosystem II, stably facilitated electrochemical water oxidation by Mn oxides.

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