Boosting photocurrent density of 1D TiO2 based photoanodes by bismuth vanadium oxide enhancement for photoelectrochemical cell application

2021 ◽  
pp. 109013
Author(s):  
Asanee Somdee ◽  
Surangkana Wannapop ◽  
Pisist Kumnorkaew ◽  
Thiti Bovornratanaraks
Keyword(s):  
Vanadium Oxide ◽  
Photocurrent Density ◽  
Photoelectrochemical Cell

Photoelectrocatalytic study and scaling up of titanium dioxide electrodes for wastewater treatment

2013 ◽  
Vol 68 (5) ◽  
pp. 999-1003 ◽  
Author(s):  
C. Pablos ◽  
R. van Grieken ◽  
J. Marugán ◽  
C. Adán ◽  
M. Osuna ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Methanol Oxidation ◽  
Kinetic Constant ◽  
Lower Surface ◽  
Photocurrent Density ◽  
Photoelectrochemical Cell ◽  
Oxidation Of Methanol ◽  
Carrier Separation ◽  
Thermal Electrode ◽  
Tio2 Phase

Different TiO2 photoelectrodes have been characterized and tested for the photoelectrocatalytic oxidation of methanol. Particulate electrodes (TiO2/Ti and TiO2/ITO) have been shown to notably favour charge-carrier transfer at the electrolyte interface while a thermal electrode (Ti) has been shown to favour charge-carrier separation when applying an electric potential bias according to cyclic voltammetry technique, as a consequence of differences in TiO2 surface between particulate and thermal electrodes. Particulate electrodes lead to a higher photoelectrocatalytic activity for methanol oxidation compared to that of the thermal electrode, probably due to the pure-rutile TiO2 phase composition of the latter and its lower surface area. TiO2/Ti electrode has been shown to be the most effective photoelectrode tested for methanol oxidation since its activity was improved by the combination of the particulate TiO2 layer and the high electrical conductivity of the support. Generally, photocurrent density measured in the photoelectrochemical cell seems to correlate with activity, whereas this correlation is not observed when using a larger photoelectrocatalytic reactor. In contrast, the activity obtained for the scaled-up electrode is found to be similar in terms of surface kinetic constant to that obtained at laboratory scale.

scholarly journals Novel Aggregation-Induced Emission Materials/Cadmium Sulfide Composite Photocatalyst for Efficient Hydrogen Evolution in Absence of Sacrificial Reagent

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5287
Author(s):  
Xi Ke ◽  
Kunqiang Wang ◽  
Chen Tu ◽  
Runda Huang ◽  
Dongxiang Luo ◽  
...  
Keyword(s):  
Renewable Energy ◽  
Energy Production ◽  
Photocurrent Density ◽  
Band Alignment ◽  
Photoelectrochemical Cell ◽  
Interfacial Resistance ◽  
Composite Photocatalyst ◽  
Aggregation Induced Emission ◽  
Renewable Energy Production ◽  
The Stability

This work focuses on the development of a novel organic–inorganic photoactive material composited by aggregation-induced emission luminogens (AIE) and CdS. Tetraphenylethene-based AIE (TPE-Ca) is synthesized on CdS to form CdS/TPE-Ca electrode, due to its suitable band structure and potential capability of renewable energy production. The CdS/TPE-Ca electrode presents over three-fold improved photocurrent density and dramatically reduced interfacial resistance, compared with the pure CdS electrode. In addition, the engineering of the band alignment allows the holes to accumulate on the valance band of TPE-Ca, which would partially prevent the CdS from photo-corrosion, thus improving the stability of the sacrificial-free electrolyte photoelectrochemical cell.

Effect of Heat Treatment on Electrodeposited ZnSe on Vertically Aligned ZnO Nanorods for Photoelectrochemical Cell

2020 ◽  
Vol 307 ◽  
pp. 179-184
Author(s):  
Laimy Mohd Fudzi ◽  
Zulkarnain Zainal ◽  
Hong Ngee Lim ◽  
Sook Keng Chang ◽  
Asma Samsudin
Keyword(s):  
Thin Film ◽  
Heat Treatment ◽  
Band Gap ◽  
Zno Nanorods ◽  
Photocurrent Density ◽  
Band Gap Energy ◽  
Photoelectrochemical Cell ◽  
Halogen Lamp ◽  
Additional Layer ◽  
Znse Layer

Following successful growth of zinc oxide (ZnO) nanorods, a layer of zinc selenide (ZnSe) was electrodeposited onto the nanorods to further enhance its conversion efficiency in the photoelectrochemical (PEC) cell. The electrodeposited ZnSe layer onto the ZnO nanorods was subjected to heat treatment at 200, 250 and 300°C. The prepared films were characterized by X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), and ultraviolet-visible spectroscopy (UV-Vis) to investigate the structural, morphological and compositional characteristics. Additionally, PEC conversion generated by the prepared thin films were tested with photocurrent measurements under calibrated visible illumination from a halogen lamp. Based on FESEM analysis, the thickness of ZnO thin film increased with temperature. However, the diameters of the ZnO nanorods were found to be in a decreasing trend upon heat treatment at higher temperature. The electrodeposited ZnSe layer at the potential of -0.7 V for 60 seconds (calcined at 200°C) possessed crystallite size of 20.1 nm. According to UV-Vis analysis, band gap energy measured was 2.8 eV, which is very close to standard ZnSe band gap value (2.7 eV). Additional layer of ZnSe electrodeposited enhanced thin film performance in terms of current density as much as 37.4% while having high photocurrent density of 0.2671 mAcm-2.

Role of Transition Metal-Hydroxide (M-OHx , M=Mn, Fe, Ni, Co) Co-catalyst Loading : Efficiency and Stability of CdS Photoanode

2015 ◽  
Vol 1776 ◽  
pp. 1-6 ◽  
Author(s):  
Alka Pareek ◽  
Pradip Paik ◽  
Pramod H. Borse
Keyword(s):  
Transition Metal ◽  
Water Oxidation ◽  
Photocurrent Density ◽  
Chemical Precipitation ◽  
Metal Hydroxide ◽  
Photoelectrochemical Cell ◽  
Precipitation Method ◽  
Catalyst Loading ◽  
Co Catalyst

ABSTRACTIn this work we have synthesized the colloidal particles of transition metal-hydroxide (M= Ni, Co, Mn, Fe) by a simple chemical precipitation method. The surface of spray deposited CdS thin films were modified using nano-colloids to utlize them as water oxidation catalysts (WOC) for the photoelectrochemical cell (PEC). A systematic comparison of the PEC performance of modified and unmodified film is carried out to understand the role of co-catalyst. Ni(OH)2 modification yields 3.4 times higher photocurrent density than bare CdS photoanode, and exhibits hydrogen-evolution rate of 600 μmol/hr. Fe(OH)2 modified film shows best stability of 8 hours as compared to the others.

scholarly journals Efficient Photoelectrochemical Water Splitting by Tailoring MoS2/CoTe Heterojunction in a Photoelectrochemical Cell

Nanomaterials ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 2341
Author(s):  
Effat Sitara ◽  
Habib Nasir ◽  
Asad Mumtaz ◽  
Muhammad Fahad Ehsan ◽  
Manzar Sohail ◽  
...  
Keyword(s):  
Water Splitting ◽  
Electrochemical Impedance ◽  
Linear Sweep Voltammetry ◽  
Photocurrent Density ◽  
Photoelectrochemical Water Splitting ◽  
Photoelectrochemical Cell ◽  
Electron Hole ◽  
Pair Separation ◽  
Electron Hole Pair ◽  
Electrochemical Impedance Spectroscopic

Solar energy conversion through photoelectrochemical water splitting (PEC) is an upcoming promising technique. MoS2/CoTe heterostructures were successfully prepared and utilized for PEC studies. MoS2 and CoTe were prepared by a hydrothermal method which were then ultrasonicated with wt. % ratios of 1:3, 1:1 and 3:1 to prepare MoS2/CoTe (1:3), MoS2/CoTe (1:1) and MoS2/CoTe (3:1) heterostructure, respectively. The pure materials and heterostructures were characterized by XRD, UV–vis-DRS, SEM, XPS, PL and Raman spectroscopy. Photoelectrochemical measurements were carried out by linear sweep voltammetry and electrochemical impedance spectroscopic measurements. A maximum photocurrent density of 2.791 mA/cm2 was observed for the MoS2/CoTe (1:1) heterojunction which is about 11 times higher than the pristine MoS2. This current density was obtained at an applied bias of 0.62 V vs. Ag/AgCl (1.23 V vs. RHE) under the light intensity of 100 mW/cm2 of AM 1.5G illumination. The enhanced photocurrent density may be attributed to the efficient electron–hole pair separation. The solar to hydrogen conversion efficiency was found to be 0.84% for 1:1 MoS2/CoTe, signifying the efficient formation of the p-n junction. This study offers a novel heterojunction photocatalyst, for PEC water splitting.

Highly stable chemisorption of dyes with pyridyl anchors over TiO2: application in dye-sensitized photoelectrochemical water reduction in aqueous media

2017 ◽  
Vol 53 (21) ◽  
pp. 3042-3045 ◽  
Author(s):  
Kohei Takijiri ◽  
Kohei Morita ◽  
Takashi Nakazono ◽  
Ken Sakai ◽  
Hironobu Ozawa
Keyword(s):  
Aqueous Media ◽  
Photocurrent Density ◽  
Photoelectrochemical Cell ◽  
Water Reduction ◽  
Dye Sensitized ◽  
Anchoring Technique

The “pyridyl anchoring technique” enables constant photocurrent density in a water reduction dye-sensitized photoelectrochemical cell with a polypyridyl ruthenium sensitizer having pyridyl anchors (Ru-py).

scholarly journals Photosensitization of TiO2 Nanotube Arrays with Nanocrystalline Pbs

2019 ◽  
Vol 7 (4.14) ◽  
pp. 560
Author(s):  
Ying-Chin Lim ◽  
Nurul Munirah Hamdan ◽  
Nur Farah Atikah Harun ◽  
Lim Ying Pei
Keyword(s):  
Visible Region ◽  
Precursor Solution ◽  
Solution Concentration ◽  
Photocurrent Density ◽  
Titania Nanotubes ◽  
Photoelectrochemical Cell ◽  
X Ray Diffraction ◽  
Silar Method ◽  
Pbs Nanoparticles ◽  
X Ray

Narrow bandgap lead sulfide (PbS) nanoparticles, which may expand the light absorption range to visible region, have attracted tremendous interest serving as promising sensitizer in coupled semiconductor for photoelectrochemical cell. In this study, PbS were deposited onto titania nanotubes by successive ionic layer adsorption and reaction (SILAR) method. During the SILAR deposition, the growth of PbS onto titania nanotubes (PbS/TNT) had been tuned by tailoring the concentration of the precursor solution. The sample microstructure was characterized using Energy Dispersive X-Ray (EDX), Field Emission Scanning Electron Microscopy (FESEM) and X-Ray Diffraction (XRD). By varying the concentration of precursor solution, size and distribution of PbS nanoparticles could be tuned. Upon growth of PbS onto TNT, all samples showed enhanced photocurrent response ascribed to the changes in microstructure and optical properties of the synthesized samples. At 100 mM solution concentration dipped for 5 SILAR cycles, the sample demonstrated the highest peak photocurrent density of 890 mA/cm2 and a corresponding photoconversion efficiency of 0.55% compared to the as-prepared TNT (36 mA/cm2). The PbS/TNT composite could be considered as an excellent photoelectrode material applied in the solar conversion devices due to its high visible light harvesting capability.    

Influence of Applied Potential on Electrodeposited ZnSe/ZnO Nanostructured Films for Photoelectrochemical Cell

2021 ◽  
Vol 317 ◽  
pp. 463-470
Author(s):  
Laimy Mohd Fudzi ◽  
Zulkarnain Zainal ◽  
Hong Ngee Lim ◽  
Suhaidi B. Shafie ◽  
Sook Keng Chang
Keyword(s):  
Zno Nanorods ◽  
Reference Electrode ◽  
Average Diameter ◽  
Photocurrent Density ◽  
Band Gap Energy ◽  
Photoelectrochemical Cell ◽  
Potential Range ◽  
Halogen Lamp ◽  
Applied Potential ◽  
Conversion Performance

Zinc oxide (ZnO) nanorods is widely investigated due to its high photoelectrochemical conversion performance. Further enhancement may be afforded by introducing a metal chalcogenide sensitization layer such as zinc selenide (ZnSe). In this study, ZnO nanorods were electrodeposited with ZnSe at potential range from -0.5 V to -0.9 V vs Ag/AgCl reference electrode. Structural, morphological and optical properties of ZnSe electrodeposited were investigated as a function applied potential by using X-ray diffractometry (XRD), field emission scanning electron microscopy (FESEM), and ultraviolet-visible spectroscopy (UV-Vis). ZnSe electrodeposited for 15 minutes at -0.7 V showed crystallite size of 20.13 nm with the lowest band gap energy of 2.97 eV. The existence of ZnSe particles with the size of 41.8 nm were proven by FESEM images, after ZnSe particles were electrodeposited onto ZnO nanorods that have an average diameter of 62.6 nm and length of 1.6 µm. The photocurrent density generated by samples were measured in a three-electrodes cell incorporated with halogen lamp. The photocurrent generated increased between -0.5 V to -0.7 V before dropped at higher applied potential due to hydrogen evolution process which affected the thin film quality, ultimately affecting photoconversion performance. The highest photocurrent density of 0.2621 mAcm-2 was recorded for samples prepared at -0.7 V vs Ag/AgCl.

scholarly journals Electrolyte Concentration Effect of a Photoelectrochemical Cell Consisting of TiO2 Nanotube Anode

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Kai Ren ◽  
Yong X. Gan ◽  
Efstratios Nikolaidis ◽  
Sharaf Al Sofyani ◽  
Lihua Zhang
Keyword(s):  
Open Circuit Voltage ◽  
Electrolyte Concentration ◽  
Uv Light ◽  
Photocurrent Density ◽  
High Viscosity ◽  
Open Circuit ◽  
Photoelectrochemical Cell ◽  
Concentration Effect ◽  
Light Illumination ◽  
Applied Bias Voltage

The photoelectrochemical responses of a TiO2 nanotube anode in ethylene glycol (EG), glycerol, ammonia, ethanol, urea, and Na2S electrolytes with different concentrations were investigated. The TiO2 nanotube anode was highly efficient in photoelectrocatalysis in these solutions under UV light illumination. The photocurrent density is obviously affected by the concentration change. Na2S generated the highest photocurrent density at 0, 1, and 2 V bias voltages, but its concentration does not significantly affect the photocurrent density. Urea shows high open circuit voltage at proper concentration and low photocurrent at different concentrations. Externally applied bias voltage is also an important factor that changes the photoelectrochemical reaction process. In view of the open circuit voltage, EG, ammonia, and ethanol fuel cells show the trend that the open circuit voltage (OCV) increases with the increase of the concentration of the solutions. Glycerol has the highest OCV compared with others, and it deceases with the increase in the concentration because of the high viscosity. The OCV of the urea and Na2S solutions did not show obvious concentration effect.

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