scholarly journals Halogenated earth abundant metalloporphyrins as photostable sensitizers for visible-light-driven water oxidation in a neutral phosphate buffer solution

2016 ◽  
Vol 18 (22) ◽  
pp. 15191-15198 ◽  
Author(s):  
Hung-Cheng Chen ◽  
Joost N. H. Reek ◽  
René M. Williams ◽  
Albert M. Brouwer
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
Oxidation Catalysts ◽  
Buffer Solution ◽  
Earth Abundant ◽  
Visible Light Driven

Chlorinated porphyrins containing earth abundant Cu(ii) and Ni(ii) are powerful and photostable photosensitizers for water oxidation catalysts.

scholarly journals Platinum(ii)–porphyrin as a sensitizer for visible-light driven water oxidation in neutral phosphate buffer

2015 ◽  
Vol 8 (3) ◽  
pp. 975-982 ◽  
Author(s):  
Hung-Cheng Chen ◽  
Dennis G. H. Hetterscheid ◽  
René M. Williams ◽  
Jarl Ivar van der Vlugt ◽  
Joost N. H. Reek ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
High Potential ◽  
Water Soluble ◽  
Buffer Solution ◽  
Visible Light Driven

A water-soluble Pt(ii)–porphyrin with a high potential for one-electron oxidation (∼1.42 V vs. NHE) proves very suitable for visible-light driven water oxidation in neutral phosphate buffer solution in combination with a variety of WOCs.

(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).

An aqueous, organic dye derivatized SnO2/TiO2 core/shell photoanode

2016 ◽  
Vol 4 (8) ◽  
pp. 2969-2975 ◽  
Author(s):  
Kyung-Ryang Wee ◽  
Benjamin D. Sherman ◽  
M. Kyle Brennaman ◽  
Matthew V. Sheridan ◽  
Animesh Nayak ◽  
...  
Keyword(s):  
Water Splitting ◽  
Phosphonic Acid ◽  
Phosphate Buffer ◽  
Phosphate Buffer Solution ◽  
Organic Dye ◽  
Photoelectrochemical Cell ◽  
Core Shell ◽  
Buffer Solution ◽  
Dye Sensitized ◽  
Visible Light Driven

Visible light driven water splitting in a dye-sensitized photoelectrochemical cell (DSPEC) based on a phosphonic acid-derivatized donor–π–acceptor (D–π–A) organic dye (P–A–π–D) is described with the dye anchored to an FTO|SnO2/TiO2 core/shell photoanode in a pH 7 phosphate buffer solution.

Efficient visible light-driven water oxidation catalysts based on B-β-{BiW8O30} and unique 14-nuclear hetero-metal sandwich unit

2018 ◽  
Vol 54 (6) ◽  
pp. 674-677 ◽  
Author(s):  
Lige Gong ◽  
Li Yu ◽  
Kai Yu ◽  
Yong Ding ◽  
Jinhua Lv ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Water Oxidation ◽  
Light Irradiation ◽  
Oxidation Catalysts ◽  
Visible Light Driven

A 14-nuclear hetero-metal unit was introduced into {BiW8} systems, which exhibits unusual catalytic activity for water oxidation under visible light irradiation.

Visible-light-driven water oxidation at a polychromium-oxo-electrodeposited TiO2 electrode as a new type of earth-abundant photoanode

2014 ◽  
Vol 50 (10) ◽  
pp. 1241-1243 ◽  
Author(s):  
Masashi Kajita ◽  
Kenji Saito ◽  
Naoto Abe ◽  
Akinori Shoji ◽  
Kazuki Matsubara ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Tio2 Electrode ◽  
Earth Abundant ◽  
Visible Light Driven ◽  
New Type

A polychromium-oxo-deposited TiO2 electrode was fabricated as an earth-abundant photoanode for visible-light-driven water oxidation.

Polyoxometalate-Based Nickel Clusters as Visible Light-Driven Water Oxidation Catalysts

2015 ◽  
Vol 137 (16) ◽  
pp. 5486-5493 ◽  
Author(s):  
Xin-Bao Han ◽  
Yang-Guang Li ◽  
Zhi-Ming Zhang ◽  
Hua-Qiao Tan ◽  
Ying Lu ◽  
...  
Keyword(s):  
Visible Light ◽  
Water Oxidation ◽  
Oxidation Catalysts ◽  
Nickel Clusters ◽  
Visible Light Driven
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