Doping Mo on Tungsten Oxide Thin Film and Photoelectrochemical Measurement

2021 ◽  
Vol 21 (9) ◽  
pp. 4813-4817
Author(s):  
Sang-Hyeok Yoon ◽  
Kyo-Seon Kim
Keyword(s):  
Thin Film ◽  
Tungsten Oxide ◽  
High Surface ◽  
High Surface Area ◽  
Single Step ◽  
Oxide Thin Film ◽  
Mo Doping ◽  
Chemical Bonding State ◽  
Electron Hole Pair ◽  
Molybdenum Doping

Tungsten oxide (WO3) is semiconductor material which can be used for various applications. Especially, one-dimensional (1-D) nanostructured WO3 shows the high photoelectrochemical (PEC) performance due to high surface area and short transport route of electron–hole pair. The flame vapor deposition (FVD) process is an efficient and economical method for preparation of the 1-D nanos-tructured WO3 thin film. Molybdenum doping is a well-known method to improve the PEC performance of WO3 by reducing band gap and increasing electrical property. In this study, we prepared the 1-D WO3 nanostructures doped with Mo by FVD single step process. We confirmed that Mo was successfully doped on WO3 without changing significantly the original nanostructure, crystal structure and chemical bonding state of WO3 thin film. As a result of PEC measurement, the pho-tocurrent densities of WO3 thin film with Mo doping were higher by about 1.4 to 2 times (for applied voltage above 0.7 V vs. SCE) than those without Mo doping.

Preparation of 1-D Nanostructured Tungsten Oxide Thin Film on Wire Mesh by Flame Vapor Deposition Process

2020 ◽  
Vol 20 (7) ◽  
pp. 4517-4520
Author(s):  
Sang-Hyeok Yoon ◽  
Kyo-Seon Kim
Keyword(s):  
Thin Film ◽  
Stainless Steel ◽  
Tungsten Oxide ◽  
Surface Area ◽  
Vapor Deposition ◽  
High Surface ◽  
High Surface Area ◽  
Wire Mesh ◽  
Oxide Thin Film ◽  
Process Conditions

Flame vapor deposition (FVD) process can be used to prepare the tungsten oxide thin film which has photocatalytic activity at visible light. The FVD process is fast and economical to prepare thin film on substrate comparing to other processes. Various nanostructured thin films could be easily prepared by controlling several process parameters in FVD. One-dimensional (1-D) nanostructures with high surface area also can be prepared reproducibly. The tungsten wire precursor was oxidized and vaporized in flame to be deposited onto the substrate. The nanostructure shapes can be adjusted by controlling nucleation and growth rates of tungsten oxide vapor on substrate. In this study, nanostructured tungsten oxide thin film was fabricated on stainless steel mesh by FVD process changing the process variables of FVD. We found that proper selection of suitable process conditions in FVD was quite important for the 1-D nanostructure growth on stainless steel wire mesh with high surface area, which is quite important for photocatalytic application.

scholarly journals Highly efficient electro-optically tunable smart-supercapacitors using an oxygen-excess nanograin tungsten oxide thin film

2017 ◽  
Vol 166 ◽  
pp. 78-85 ◽  
Author(s):  
Akbar I. Inamdar ◽  
Jongmin Kim ◽  
Yongcheol Jo ◽  
Hyeonseok Woo ◽  
Sangeun Cho ◽  
...  
Keyword(s):  
Thin Film ◽  
Tungsten Oxide ◽  
Oxide Thin Film ◽  
Highly Efficient ◽  
Oxygen Excess

Nanostructured tungsten oxide thin film devices: from optoelectronics and ionics to iontronics

2019 ◽  
Vol 7 (42) ◽  
pp. 12968-12990 ◽  
Author(s):  
Zhenyin Hai ◽  
Zihan Wei ◽  
Chenyang Xue ◽  
Hongyan Xu ◽  
Francis Verpoort
Keyword(s):  
Thin Film ◽  
Tungsten Oxide ◽  
Recent Progress ◽  
Oxide Thin Film ◽  
Development Trends ◽  
Challenges And Opportunities ◽  
Thin Film Devices

Recent progress of nanostructured tungsten oxide thin film devices is reviewed from optoelectronics and ionics to iontronics with their development trends, challenges, and opportunities analyzed and proposed.

Facile Synthesis of Activated Carbon from Swamp Taro Stalk via Single Step ZnCl2 Activation

2016 ◽  
Vol 857 ◽  
pp. 475-479 ◽  
Author(s):  
M.S. Mohammed Yahya ◽  
Jeyashelly Andas ◽  
Ghani Zaidi Ab
Keyword(s):  
Activated Carbon ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Total Pore Volume ◽  
Structure Type ◽  
Sem Analysis ◽  
Single Step ◽  
Bet Surface Area ◽  
Type Iv

In this work, mesoporous activated carbon with high surface area was synthesized from swamp taro stalk by single step ZnCl2 activation. The synthesized activated carbon was characterized by Na2S2O3 volumetric method, Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscope (SEM) and N2 adsorption-desorption analyses. Under the single step ZnCl2 activation, the registered iodine number, BET surface area, total pore volume and pore diameter were 1087.57 mgg-1, 1242.26 m2g-1, 0.73cm3g-1 and 3.72 nm respectively with yield of 25.34%. SEM analysis evidenced the well-formation of porous structure. Type IV isotherm with H2 loops obtained from N2-sorption studies indicates the ink bottles shape mesoporous network structure. This research proved the successful conversion of plant waste into high grade activated carbon.

ATOMISTIC SIMULATION OF DISSIPATIVE CHARGE CARRIER DYNAMICS FOR PHOTOCATALYSIS

2012 ◽  
Vol 1390 ◽  
Author(s):  
Talgat M. Inerbaev ◽  
Dmitri S. Kilin ◽  
James Hoefelmeyer
Keyword(s):  
Charge Transfer ◽  
High Surface ◽  
High Surface Area ◽  
Oxidation Catalysis ◽  
Electron Hole ◽  
Charge Carrier Dynamics ◽  
Electron Hole Pair ◽  
Charge Transfer Dynamics ◽  
Reduced Density ◽  
Positively Charged

ABSTRACTPhoto-excitation of high surface area semiconductor nanorods decorated with surface catalyst particles are investigated. DFT-based simulation is applied to the charge transfer dynamics at the interface of the supported nanocatalyst by modeling dynamics of photo-excitations. The modeling is performed by reduced density matrix method in the basis of Kohn-Sham orbitals. The energy of photo-excitation is dissipating due to interaction with lattice vibrations, treated through non-adiabatic coupling as the electron/hole pair relaxes to the conduction / valence band edges. The methodology is applied to TiO2 nanorod modeled as a periodic anatase (100) slab functionalized by minimalistic nano-clusters or doping. Simulations of these models demonstrate the formation of charge transfer state in both time and frequency domain. Computed charge dynamics leads to creation of positively charged areas on the nanorod surface that is an important prerequisite for oxidation catalysis. Our computation identifies optimal composition and morphology of nanocatalyst for such applications as water splitting for hydrogen production or solar cells.

Space-confined preparation of high surface area tungsten oxide and tungsten nitride inside the pores of mesoporous silica SBA-15

2015 ◽  
Vol 211 ◽  
pp. 147-151 ◽  
Author(s):  
Simon Meyer ◽  
Hans Beyer ◽  
Klaus Köhler ◽  
Annemette Hindhede Jensen ◽  
Erik Christensen ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Tungsten Oxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Tungsten Nitride ◽  
And Tungsten
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