scholarly journals Understanding charge transport in non-doped pristine and surface passivated hematite (Fe2O3) nanorods under front and backside illumination in the context of light induced water splitting

2016 ◽  
Vol 18 (44) ◽  
pp. 30370-30378 ◽  
Author(s):  
Prince Saurabh Bassi ◽  
Li Xianglin ◽  
Yanan Fang ◽  
Joachim Say Chye Loo ◽  
James Barber ◽  
...  
Keyword(s):  
Charge Transport ◽  
Water Splitting ◽  
Annealing Temperature ◽  
Depth Study ◽  
Hematite Fe2o3

This work reports an in-depth study of the performance of hematite nanorods under back and front illumination while varying the crucial annealing temperature.

scholarly journals Ni/Si-Codoped TiO2 Nanostructure Photoanode for Enhanced Photoelectrochemical Water Splitting

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4102 ◽  
Author(s):  
Ting Li ◽  
Dongyan Ding
Keyword(s):  
Water Splitting ◽  
Annealing Temperature ◽  
Photocurrent Density ◽  
Electrochemical Anodization ◽  
Codoped Tio2 ◽  
Lower Charge ◽  
Si Doped ◽  
Tio2 Nanostructures ◽  
Tio2 Photoanode ◽  
Pec Water Splitting

We synthesized Ni/Si-codoped TiO2 nanostructures for photoelectrochemical (PEC) water splitting, by electrochemical anodization of Ti-1Ni-5Si alloy foils in ethylene glycol/glycerol solutions containing a small amount of water. The effects of annealing temperature on PEC properties of Ni/Si-codoped TiO2 photoanode were investigated. We found that the Ni/Si-codoped TiO2 photoanode annealed at 700 °C had an anatase-rutile mixed phase and exhibited the highest photocurrent density of 1.15 mA/cm2 at 0 V (vs. Ag/AgCl), corresponding to a photoconversion efficiency of 0.70%, which was superior to Ni-doped and Si-doped TiO2. This improvement in PEC water splitting could be attributed to the extended light absorption, faster charge transfer, possibly lower charge recombination, and longer lifetime.

Effects of yttrium, ytterbium with tungsten co-doping on the light absorption and charge transport properties of bismuth vanadate photoanodes to achieve superior photoelectrochemical water splitting

2020 ◽  
Vol 4 (3) ◽  
pp. 1496-1506 ◽  
Author(s):  
Umesh Prasad ◽  
Jyoti Prakash ◽  
Arunachala M. Kannan
Keyword(s):  
Charge Transport ◽  
Transport Properties ◽  
Water Splitting ◽  
Light Absorption ◽  
Bismuth Vanadate ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Cell ◽  
Co Doping ◽  
Effective Water

Effective water splitting by a photoelectrochemical cell using a BiVO4 photoanode is limited by the light absorption and charge transport properties.

Charge Transport in Mesoscopic Carbon Network Structures

2001 ◽  
Vol 705 ◽  
Author(s):  
V. Ksenevich ◽  
J. Galibert ◽  
V. Samuilov ◽  
Y.-S. Seo ◽  
J. Sokolov ◽  
...  
Keyword(s):  
Charge Transport ◽  
Quantum Interference ◽  
Annealing Temperature ◽  
Weak Localization ◽  
Coulomb Gap ◽  
Temperature Range ◽  
Self Assembling ◽  
Carbon Structures ◽  
Carbon Networks ◽  
Low Dimensional

AbstractThe charge transport and quantum interference effects in low-dimensional mesoscopic carbon networks prepared using self-assembling were investigated. The mechanism of conduction in low-dimensional carbon networks was found to depend on the annealing temperature of the nitrocellulose precursor. The charge transport mechanism for carbon networks obtained at Tann=750 0C was found to be the hopping conductivity in the entire investigated temperature range. The Coulomb gap near the Fermi level in the density of states was observed in the investigated carbon networks. The width of the Coulomb gap was found to be decreased with the annealing temperature of the carbon structures. The crossover from the strong localization to the weak localization regime of the charge transport in the carbon structures, obtained at Tann=950 0C and Tann=1150 0C, was observed in the temperature range T>100 K and T>20 K, respectively.

Orientation modulated charge transport in hematite for photoelectrochemical water splitting

2016 ◽  
Vol 09 (03) ◽  
pp. 1650047 ◽  
Author(s):  
Jiajia Cai ◽  
Yinglei Liu ◽  
Song Li ◽  
Meiqi Gao ◽  
Dunwei Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Single Crystal ◽  
Charge Transport ◽  
Water Splitting ◽  
High Magnetic Field ◽  
Current Method ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Performance

Hematite is currently considered one of the most promising photoanode materials for light-driven water splitting. The photoelectrochemical performance of hematite is limited by its low conductivity. In this work, we demonstrate that the conductivity of hematite films can be tuned by controlling the orientation of hematite crystals. By applying a high magnetic field (up to 10 T) during the drop-casting preparation, hematite films composed of single crystal particles show featured texture by promoting those particles alignment with (001) normal to the substrate. By enhancing the photocurrent densities with tuned hematite orientation, the current method provides an effective way for increasing the number of carriers that can reach the surface.

Temperature-Dependent Charge Transport of Large-Area Molecular Junctions with PEDOT:PSS Electrodes

2020 ◽  
Vol 12 (3) ◽  
pp. 333-336
Author(s):  
Jungmoon Lim ◽  
Gahyun Ahn ◽  
Inho Jeong ◽  
Hyunwook Song
Keyword(s):  
Charge Transport ◽  
Annealing Temperature ◽  
Molecular Junctions ◽  
Electrical Characteristics ◽  
Large Area ◽  
Temperature Dependent ◽  
Interfacial Contact ◽  
End Groups ◽  
Backbone Structure ◽  
Dependent Transport

We report on the temperature-dependent transport behaviors of large-area molecular junctions fabricated with poly-(3,4-ethylene-dioxythiophene) stabilized with polystyrene sulphonic acid (PEDOT:PSS) interlayer electrodes and the archetypal benzenethiol molecules. In this study, we investigated two different benzenethiol molecules: 4-methylbenzenethiol (MBT) and 1,4-benzenedithiol (BDT), which have the identical backbone structure but different top end-groups. The charge transport through the molecular junctions was dominated by distinct interfacial contact properties between the PEDOT:PSS electrodes and the component molecules. We also observed that the electrical characteristics of the MBT junctions are influenced by the PEDOT grain size, particularly depending on the annealing temperature.

scholarly journals Bottom-Up Synthesis of Porous NiMo Alloy for Hydrogen Evolution Reaction

2017 ◽  
Author(s):  
Kailong Hu ◽  
Samuel Jeong ◽  
Mitsuru Wakisaka ◽  
Jun-ichi Fujita ◽  
Yoshikazu Ito
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Production ◽  
Water Splitting ◽  
Hydrogen Evolution Reaction ◽  
Annealing Temperature ◽  
Hydrogen Atmosphere ◽  
Porous Electrodes ◽  
Bottom Up ◽  
Annealing Temperatures ◽  
Oxide Phases

Bottom-up synthesis of porous NiMo alloy reduced by NiMoO4 nanofibers was systematically investigated to fabricate non-noble metal porous electrodes for hydrogen production. The different annealing temperatures of NiMoO4 nanofibers under hydrogen atmosphere reveal that the 950 °C annealing temperature is a key to produce bicontinuous and monorhinic porous NiMo alloy without oxide phases. The porous NiMo alloy as cathodes in electrical water splitting demonstrates not only almost identical catalytic activity with commercial Pt/C, but also superb stability for 12 days.

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