scholarly journals Distance dependent charge separation and recombination in semiconductor/molecular catalyst systems for water splitting

2014 ◽  
Vol 50 (84) ◽  
pp. 12768-12771 ◽  
Author(s):  
Anna Reynal ◽  
Janina Willkomm ◽  
Nicoleta M. Muresan ◽  
Fezile Lakadamyali ◽  
Miquel Planells ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Water Splitting ◽  
Charge Separation ◽  
Molecular Catalyst ◽  
Catalyst Systems ◽  
Kinetics Of

The molecular structure of the catalyst strongly influences the kinetics of charge separation and recombination.

Plasmonic gold nanoparticle-decorated BiVO4/ZnO nanowire heterostructure photoanodes for efficient water oxidation

2018 ◽  
Vol 8 (15) ◽  
pp. 3759-3766 ◽  
Author(s):  
Seungkyu Kim ◽  
Yejong Yu ◽  
Sang Yun Jeong ◽  
Mi Gyoung Lee ◽  
Hye Won Jeong ◽  
...  
Keyword(s):  
Gold Nanoparticle ◽  
Water Splitting ◽  
Water Oxidation ◽  
Charge Separation ◽  
Au Nanoparticles ◽  
Photoelectrochemical Water Splitting ◽  
Zno Nanowire ◽  
Kinetics Of

To enhance the charge separation and kinetics of water oxidation using a BiVO4 photoanode, a BiVO4/ZnO nanowire heterostructure decorated with gold (Au) nanoparticles is fabricated as a photoanode for photoelectrochemical water splitting.

scholarly journals Understanding the anatase–rutile phase junction in charge separation and transfer in a TiO2 electrode for photoelectrochemical water splitting

2016 ◽  
Vol 7 (9) ◽  
pp. 6076-6082 ◽  
Author(s):  
Ailong Li ◽  
Zhiliang Wang ◽  
Heng Yin ◽  
Shengyang Wang ◽  
Pengli Yan ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation ◽  
Rutile Phase ◽  
Interface Structure ◽  
Photoelectrochemical Water Splitting ◽  
Tio2 Electrode ◽  
Phase Alignment ◽  
Efficient Charge

The key to phase junctions for efficient charge separation is to consider both the phase alignment and interface structure.

Copolymerization of Isobutene and Isoprene at “High” Temperature with Syncatalyst Systems Based on Aluminum Organic Compounds

1976 ◽  
Vol 49 (4) ◽  
pp. 937-959 ◽  
Author(s):  
S. Cesca ◽  
M. Bruzzone ◽  
A. Priola ◽  
G. Ferraris ◽  
P. Giusti
Keyword(s):  
Energy Savings ◽  
Ion Pairs ◽  
Great Part ◽  
Methyl Chloride ◽  
Reactivity Ratio ◽  
Experimental Conditions ◽  
Noticeable Increase ◽  
Catalyst Systems ◽  
Kinetics Of ◽  
Kinetics Of Vulcanization

Abstract New catalyst systems based on alkylaluminum derivatives and halogen or interhalogen compounds were found highly efficient in the synthesis of high-molecular-weight IIR at temperatures above − 50°C. The reaction mechanism was studied in detail for the system Et2AlCl + Cl2. The reactions occurring between chlorine, isobutene, Et2AlCl, and the solvent (CH3Cl) were elucidated and studied under various experimental conditions (e.g. presence or absence of light, simultaneous presence of the copolymerization system components, temperature, type of halogen, use of model compound of isobutene). It was concluded that halogenium ions, i.e. Cl+, Br+, or I+, are the initiating species. Kinetic and conductometric investigations showed that scarcely dissociated ion pairs, e.g. Cl+[Et2AlCl2]−, were formed in the absence of monomer; but in the presence of isobutene, a noticeable increase of the electrical conductivity and rapid polymerization occurred. The maximum polymerization rate was first order with respect to the concentrations of monomer, Cl2, and Et2AlCl. In the homopolymerization of isobutene, transfer to monomer and termination reactions were negligible. The MW of IIR was found to be mainly dependent on the concentrations of the catalyst components, on isoprene concentration, and on temperature. The reactivity ratio of isobutene with isoprene was found to be r1=2.5±0.5 at −35°C, while the activation energies relative to MW were −5.8 ± 0.4, kcal/mol for polyisobutene, and −5.7 ± 0.7 and − 4.3 ± 0.5 kcal/mol for IIR containing, respectively, 1.3 and 1.9 mol% of isoprene. The evaluation of some physicochemical and technological properties of typical IIR produced with the system Et2AlCl + Cl2, indicated that isoprene is randomly distributed along the chains and that the MWD is monomodal, while the glass transition temperature, tensile properties, mechanical-dynamic spectra, and kinetics of vulcanization are very similar to those of commercial IIR. Very preliminary data, referring to several classes of new catalyst systems yielding IIR having good properties, were also obtained. The syncatalyst systems here described can work in a homogeneous phase consisting of an aliphatic hydrocarbon besides methyl chloride, still giving IIR with high MW. Therefore, a completely homogeneous process can be envisioned for the synthesis of IIR at −50°C thus avoiding a great part of the fouling problems of the slurry process. The economic advantage of using “high” temperatures of polymerization is briefly discussed in terms of energy savings.

The direct observation of charge separation dynamics in CdSe quantum dots/cobaloxime hybrids

2016 ◽  
Vol 18 (6) ◽  
pp. 4300-4303 ◽  
Author(s):  
J. Huang ◽  
Y. Tang ◽  
K. L. Mulfort ◽  
X. Zhang
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Charge Separation ◽  
Cdse Quantum Dots ◽  
X Ray ◽  
Molecular Catalyst ◽  
Cdse Quantum Dot ◽  
Photoinduced Charge Separation ◽  
X Ray Absorption ◽  
Photoinduced Charge

In this work, we investigated photoinduced charge separation dynamics in a CdSe quantum dot/cobaloxime molecular catalyst hybrid using the combination of transient optical (OTA) and X-ray absorption (XTA) spectroscopy.

Assembling γ-graphyne surrounding TiO2 nanotube arrays: An efficient p-n heterojunction for boosting photoelectrochemical water splitting

2021 ◽  
Author(s):  
Dong Qiu ◽  
Chengli He ◽  
Yuxuan Lu ◽  
Qiaodan Li ◽  
Yang Chen ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation ◽  
Hydrogen Generation ◽  
Electron Injection ◽  
Tio2 Nanotube Arrays ◽  
Tio2 Nanotube ◽  
Photoelectrochemical Water Splitting ◽  
Nanotube Arrays ◽  
Injection Efficiency ◽  
Electron Injection Efficiency

Photoelectrochemical water splitting is an excellent strategy for hydrogen generation, and it is pivotal to develop photoanodes with proficient sunlight harvesting, rapid charge separation, and enhanced electron injection efficiency. In...

Direct Electrochemical Visualization of the Orthogonal Charge Separation in Anatase Nanotube Photoanodes for Water Splitting

ACS Catalysis ◽  
2022 ◽  
pp. 1201-1208
Author(s):  
Marina V. Makarova ◽  
Fumiaki Amano ◽  
Shinpei Nomura ◽  
Chihiro Tateishi ◽  
Takeshi Fukuma ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation

Enhancing light harvesting and charge separation of Cu2O photocathodes with spatially separated noble-metal cocatalysts towards highly efficient water splitting

2018 ◽  
Vol 6 (41) ◽  
pp. 20393-20401 ◽  
Author(s):  
Dong Chen ◽  
Zhifeng Liu ◽  
Zhengang Guo ◽  
Weiguo Yan ◽  
Ying Xin
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
Charge Separation ◽  
Light Harvesting ◽  
Highly Efficient

A feasible strategy of spatially separated noble-metal cocatalysts for Cu2O photocathodes to enhance light harvesting and charge separation.

scholarly journals Water Splitting: In Situ Formation of Oxygen Vacancies Achieving Near‐Complete Charge Separation in Planar BiVO 4 Photoanodes (Adv. Mater. 26/2020)

2020 ◽  
Vol 32 (26) ◽  
pp. 2070198 ◽  
Author(s):  
Songcan Wang ◽  
Tianwei He ◽  
Peng Chen ◽  
Aijun Du ◽  
Kostya (Ken) Ostrikov ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation ◽  
Oxygen Vacancies ◽  
In Situ Formation

Enhancing charge separation on high symmetry SrTiO3exposed with anisotropic facets for photocatalytic water splitting

2016 ◽  
Vol 9 (7) ◽  
pp. 2463-2469 ◽  
Author(s):  
Linchao Mu ◽  
Yue Zhao ◽  
Ailong Li ◽  
Shengyang Wang ◽  
Zhiliang Wang ◽  
...  
Keyword(s):  
Water Splitting ◽  
Charge Separation ◽  
High Symmetry ◽  
Photocatalytic Water Splitting ◽  
Highly Efficient ◽  
Overall Water Splitting ◽  
Spatial Charge

Spatial charge separation achieved on the anisotropic facets of high symmetry SrTiO3nanocrystals for highly efficient photocatalytic overall water splitting.

Sign in / Sign up

Export Citation Format

Share Document