scholarly journals Multi-Electron-Transfer Catalysts Needed for Artificial Photosynthesis

2012 ◽  
Vol 1387 ◽  
Author(s):  
James Vickers ◽  
Hongjin Lv ◽  
Petro F. Zhuk ◽  
Yurii V. Geletii ◽  
Craig L. Hill
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Electron Transfer ◽  
Catalytic Activity ◽  
Induction Period ◽  
Water Oxidation ◽  
Fuel Production ◽  
Oxygen Ligand ◽  
Visible Light Driven ◽  
Simple Kinetic Model

ABSTRACTWe report a study on catalytic water oxidation by cobalt in oxygen ligand environments because such systems are as promising as any in the water oxidation component of solar fuel production. We have re-examined the catalytic activity of Co(II) in aqueous solution using either [Ru(bpy)3]3+ as a stoichiometric oxidant or in visible-light-driven reactions with persulfate as a sacrificial electron acceptor. In both systems a distinctive induction period is observed. A simple kinetic model is proposed that describes the experimental data well. The presence of an induction period is explained by relatively slow formation of the true catalyst from aquacobalt(II).

scholarly journals AuNPs-Based Thermoresponsive Nanoreactor as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 963
Author(s):  
Wei Liu ◽  
Xiaolian Zhu ◽  
Chengcheng Xu ◽  
Zhao Dai ◽  
Zhaohui Meng
Keyword(s):  
Aqueous Solution ◽  
Electron Transfer ◽  
Phase Transformation ◽  
Catalytic Activity ◽  
Catalytic Efficiency ◽  
Environmental Pollutant ◽  
Temperature Sensitive ◽  
Efficient Catalyst ◽  
Catalytic Rate ◽  
Silica Core

A new AuNPs-based thermosensitive nanoreactor (SiO2@PMBA@Au@PNIPAM) was designed and prepared by stabilizing AuNPs in the layer of poly(N,N’-methylenebisacrylamide) (PMBA) and subsequent wrapping with the temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) layer. The new nanoreactor exhibited high dispersibility and stability in aqueous solution and effectively prevented the aggregation of AuNPs caused by the phase transformation of PNIPAM. The XPS and ATR-FTIR results indicated that AuNPs could be well stabilized by PMBA due to the electron transfer between the N atoms of amide groups in the PMBA and Au atoms of AuNPs. The catalytic activity and thermoresponsive property of the new nanoreactor were invested by the reduction of the environmental pollutant, 4-nitrophenol (4-NP), with NaBH4 as a reductant. It exhibited a higher catalytic activity at 20 °C and 30 °C (below LCST of PNIPAM), but an inhibited catalytic activity at 40 °C (above LCST of PNIPAM). The PNIPAM layer played a switching role in controlling the catalytic rate by altering the reaction temperature. In addition, this nanoreactor showed an easily recyclable property due to the existence of a silica core and also preserved a rather high catalytic efficiency after 16 times of recycling.

Catalytic activity of NiMnO3 for visible light-driven and electrochemical water oxidation

2013 ◽  
Vol 15 (44) ◽  
pp. 19125 ◽  
Author(s):  
Dachao Hong ◽  
Yusuke Yamada ◽  
Akifumi Nomura ◽  
Shunichi Fukuzumi
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Water Oxidation ◽  
Visible Light Driven

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.

scholarly journals High Catalytic Activity of Heteropolynuclear Cyanide Complexes Containing Cobalt and Platinum Ions: Visible-Light Driven Water Oxidation

2015 ◽  
Vol 54 (19) ◽  
pp. 5613-5617 ◽  
Author(s):  
Yusuke Yamada ◽  
Kohei Oyama ◽  
Rachel Gates ◽  
Shunichi Fukuzumi
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Water Oxidation ◽  
High Catalytic Activity ◽  
Visible Light Driven ◽  
Cyanide Complexes

Au nanoparticle-doped Co3O4–CoFe2O4@SiO2 as a catalyst for visible-light-driven water oxidation

2018 ◽  
Vol 42 (18) ◽  
pp. 14757-14765 ◽  
Author(s):  
Wenlan Ma ◽  
Hui Li ◽  
Qian Xu ◽  
Yi Zhang ◽  
Wei Wang ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Electron Transfer ◽  
Visible Light ◽  
Water Oxidation ◽  
Transfer Rate ◽  
Au Nanoparticle ◽  
Low Dielectric Constant ◽  
Electron Transfer Rate ◽  
Low Dielectric ◽  
Visible Light Driven

Composites of low dielectric constant SiO2, Au and metal oxide was obtained, it showed higher O2 evolution performance due to enhancing the electron transfer rate.

Visible light-driven water oxidation with a subporphyrin sensitizer and a water oxidation catalyst

2016 ◽  
Vol 52 (94) ◽  
pp. 13702-13705 ◽  
Author(s):  
Masanori Yamamoto ◽  
Yusuke Nishizawa ◽  
Pavel Chábera ◽  
Fusheng Li ◽  
Torbjörn Pascher ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Light Absorption ◽  
Water Oxidation ◽  
Artificial Photosynthesis ◽  
Oxidation Catalyst ◽  
Interfacial Electron Transfer ◽  
Visible Light Absorption ◽  
Visible Light Driven

A newly designed contracted porphyrin achieved efficient visible light absorption and interfacial electron transfer for water oxidation in artificial photosynthesis.

scholarly journals High Catalytic Activity of Heteropolynuclear Cyanide Complexes Containing Cobalt and Platinum Ions: Visible-Light Driven Water Oxidation

2015 ◽  
Vol 127 (19) ◽  
pp. 5705-5709 ◽  
Author(s):  
Yusuke Yamada ◽  
Kohei Oyama ◽  
Rachel Gates ◽  
Shunichi Fukuzumi
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Water Oxidation ◽  
High Catalytic Activity ◽  
Visible Light Driven ◽  
Cyanide Complexes

Effects of morphology and exposed facets of α-Fe2O3 nanocrystals on photocatalytic water oxidation

RSC Advances ◽  
2015 ◽  
Vol 5 (64) ◽  
pp. 52210-52216 ◽  
Author(s):  
Quanjun Xiang ◽  
Gui Chen ◽  
Tai-Chu Lau
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Water Oxidation ◽  
Visible Light Driven ◽  
Exposed Facets

The catalytic activity of α-Fe2O3 nanocubes, nanoplates, nanoflakes and nanoparticles for visible light-driven water oxidation is strongly morphology-dependent; α-Fe2O3 nanocubes with exposed {012} facets exhibit far higher activity than nanosheets with exposed {001} facets.

Thermal and photoinduced electron-transfer catalysis of high-valent metal-oxo porphyrins in oxidation of substrates

2016 ◽  
Vol 20 (01n04) ◽  
pp. 35-44 ◽  
Author(s):  
Shunichi Fukuzumi ◽  
Wonwoo Nam
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Water Oxidation ◽  
Photoinduced Electron Transfer ◽  
Hydrogen Abstraction ◽  
Eosin Y ◽  
Cobalt Porphyrins ◽  
Heme Domain ◽  
Visible Light Driven ◽  
High Valent

In this manuscript, we have overviewed thermal and photoinduced electron transfer catalysis of high-valent metal-oxo porphyrins in oxidation of various substrates. The high-valent iron-oxo porphyrin in cytochrome P450 (P450) is produced by photoinduced electron transfer from electron donors, such as triethanolamine (TEOA), to the excited state of a photosensitizer such as eosin Y, followed by the reduction of the heme domain of P450 by the resulting radical anion of the photosensitizer and the subsequent reaction of the reduced heme with dioxygen (O[Formula: see text]. Various substrates were oxidized by O2 in this visible light-driven electron-transfer catalytic reaction with several P450s from bacteria and humans. A manganese(V)-oxo corrorazine was produced by photoinduced electron transfer from the excited state of manganese(III) corrorazine to O2, followed by hydrogen abstraction from toluene derivatives, catalyzing the oxidation of toluene derivatives with O2 in the presence of an acid via photoinduced electron transfer catalysis. High-valent manganese-oxo porphyrins are also produced by photoinduced electron transfer from the excited state of [Ru(bpy)3][Formula: see text] (bpy = 2,2′-bipyridine) to electron acceptors, followed by electron transfer oxidation of manganese(III) porphyrins with [Ru(bpy)3][Formula: see text], catalyzing oxidation of various substrates with O2. Finally photoinduced electron-transfer catalysis of cobalt porphyrins is discussed for the photocatalytic water oxidation with persulfate.

Sign in / Sign up

Export Citation Format

Share Document