Supphasin Thaweesak | Burapha University (original) (raw)
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Papers by Supphasin Thaweesak
RSC Advances, 2022
A silver/titanium dioxide nanoplate (Ag/TiO 2 NP) photoelectrode was designed and fabricated from... more A silver/titanium dioxide nanoplate (Ag/TiO 2 NP) photoelectrode was designed and fabricated from vertically aligned TiO 2 nanoplates (NP) decorated with silver nanoparticles (NPs) through a simple hydrothermal synthesis and electrodeposition route. The electrodeposition times of Ag NPs on the TiO 2 NP were crucial for surface plasmon-driven photoelectrochemical (PEC) water splitting performance. The Ag/TiO 2 NP at the optimal deposition time of 5 min with a Ag element content of 0.53 wt% demonstrated a remarkably high photocurrent density of 0.35 mA cm À2 at 1.23 V vs. RHE under AM 1.5G illumination, which was 5 fold higher than that of the pristine TiO 2 NP. It was clear that the enhanced light absorption properties and PEC performance for Ag/TiO 2 NP could be effectively adjusted by simply controlling the loading amounts of metallic Ag NPs (average size of 10-30 nm) at different electrodeposition times. The superior PEC performance of the Ag/TiO 2 NP photoanode was attributed to the synergistic effects of the plasmonic Ag NPs and the TiO 2 nanoplate. Interestingly, the plasmonic effect of Ag NPs not only increased the visible-light response (l max ¼ 570 nm) of TiO 2 but also provided hot electrons to promote photocurrent generation and suppress charge recombination. Importantly, this study offers a potentially efficient strategy for the design and fabrication of a new type of TiO 2 hybrid nanostructure with a plasmonic enhancement for PEC water splitting.
RSC Advances
A dual-functional WO3/BiVO4 photoanode achieved remarkable photocurrent density, 6.85 mA cm−2 at ... more A dual-functional WO3/BiVO4 photoanode achieved remarkable photocurrent density, 6.85 mA cm−2 at 1.23 V vs. RHE and high efficiency for glycerol degradation.
Nano Energy, 2016
WO 3 nanoplate arrays with (002) oriented facets grown on fluorine doped SnO 2 (FTO) glass substr... more WO 3 nanoplate arrays with (002) oriented facets grown on fluorine doped SnO 2 (FTO) glass substrates are tailored by tuning the precursor solution via a facile hydrothermal method. A 2-step hydrothermal method leads to the preferential growth of WO 3 film with enriched (002) facets, which exhibits extraordinary photoelectrochemical (PEC) performance with a remarkable photocurrent density of 3.7 mA cm-2 at 1.23 V vs. revisable hydrogen electrode (RHE) under AM 1.5 G illumination without the use of any cocatalyst, corresponding to ~93% of the theoretical photocurrent of WO 3. Density functional theory (DFT) calculations together with experimental studies reveal that the enhanced photocatalytic activity and better photostability of the WO 3 films are attributed to the synergistic effect of highly reactive (002) facet 2 and nanoplate structure which facilitates the photo-induced charge carrier separation and suppresses the formation of peroxo-species. Without the use of oxygen evolution cocatalysts, the excellent PEC performance, demonstrated in this work, by simply tuning crystal facets and nanostructure of pristine WO 3 films may open up new opportunities in designing high performance photoanodes for PEC water splitting.
Physical Chemistry Chemical Physics, 2013
Applied Surface Science, 2017
Ag nanoparticle-decorated TiO 2 NWs were fabricated by a facile chemical method. Ag-decorated T... more Ag nanoparticle-decorated TiO 2 NWs were fabricated by a facile chemical method. Ag-decorated TiO 2 NWs was used as photoanode for PEC water splitting. The photoanode shows remarkable visible-light PEC water splitting performance.
Nanomaterials
ZnO and Aluminum doped ZnO nanoparticles (Al/ZnO NPs) were successfully synthesized by the sol-ge... more ZnO and Aluminum doped ZnO nanoparticles (Al/ZnO NPs) were successfully synthesized by the sol-gel method. Together with the effect of calcination temperatures (200, 300 and 400 °C) and Al dosage (1%, 3%, 5% and 10%) on structural, morphological and optical properties of Al/ZnO NPs, their photocatalytic degradation of methyl orange (MO) dye was investigated. The calcination temperatures at 200, 300 and 400 °C in forming structure of ZnO NPs led to spherical nanoparticle, nanorod and nanoflake structures with a well-crystalline hexagonal wurtzite, respectively. The ZnO NPs calcined at 200 °C exhibited the highest specific surface area and light absorption property, leading to the MO removal efficiency of 80% after 4 h under the Ultraviolet (UV) light irradiation. The MO removal efficiency was approximately two times higher than the nanoparticles calcined at 400 °C. Furthermore, the 5% Al/ZnO NPs exhibited superior MO removal efficiency of 99% in only 40 min which was approximately 20...
Journal of Hazardous Materials
International Journal of Food Science
The rising global population continues to threaten the world’s food security. The discovery of ne... more The rising global population continues to threaten the world’s food security. The discovery of new technologies to produce food of nutritional and functional properties is urgently needed. One beneficial food to humans of known nutritional value is the prebiotic levan. To address the problem, the present work is aimed at isolating levansucrase enzyme-producing microorganisms from traditional fermented food in Thailand. Bacterial colony morphology was observed for mucoidal consistency on culture plates. Isolated colonies were characterized morphologically by gram staining methods. Dinitrosalicylic acid (DNS) and thin-layer chromatography (TLC) reported the highest microbial enzyme activity of 8.51 IU/ml at 12 hours via hydrolysis and frutotransferase activities. Structural characterization of levan via Fourier-transform infrared spectroscopy (FTIR) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy showed β-(2,6)-fructofuranose linkages. The highest enzyme activity was exhi...
Progress in Natural Science: Materials International
Journal of Materials Science & Technology
Photocatalysis has attracted much attention in recent years due to its potential in solving energ... more Photocatalysis has attracted much attention in recent years due to its potential in solving energy and environmental issues. Even though numerous achievements have been made, the photocatalytic systems developed to date are still far from practical applications due to the low efficiency and poor durability. Efficient light absorption and charge separation are two of the key factors for the exploration of high performance photocatalytic systems, which is generally difficult to be obtained in a single photocatalyst. The combination of various materials to form heterojunctions provides an effective way to better harvest solar energy and to facilitate charge separation and transfer, thus enhancing the photocatalytic activity and stability. This review concisely summarizes the recent development of visible light responsive heterojunctions, including the preparation and performances of semiconductor/semiconductor junctions, semiconductor/cocatalyst junctions, semiconductor/metal junctions, semiconductor/non-metal junctions, and surface heterojunctions, and their mechanism for enhanced light harvesting and charge separation/transfer.
Dalton Trans.
A new type of boron-doped graphitic carbon nitride (B-g-C3N4) nanosheets was prepared by a benign... more A new type of boron-doped graphitic carbon nitride (B-g-C3N4) nanosheets was prepared by a benign one-pot thermal polycondensation process.
Applied Catalysis B: Environmental, 2017
A new type of visible light active composite containing exfoliated g-C3N4 nanosheets and Ca2Nb2Ta... more A new type of visible light active composite containing exfoliated g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets was prepared. Systematic studies reveal that the g-C3N4/Ca2Nb2TaO10 nanosheet composite with a mass ratio of 80:20 exhibits the best performance in photocatalytic H2 evolution under visible light-irradiation, which is more than 2.8 times out-performing bare g-C3N4 bulk. The enhancement of photocatalytic H2 evolution of the g-C3N4/Ca2Nb2TaO10 composite is attributed to the intimate interfacial connection and synergistic effect between g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets with cascading electrons for efficient charge recombination suppression. Highlights Novel g-C3N4/Ca2Nb2TaO10 nanosheet composite was simply prepared by exfoliation-reassembly method. The hybridization between the g-C3N4 and Ca2Nb2TaO10 nanosheets provides an intimate interfacial connection. The synergistic effect of g-C3N4 and Ca2Nb2TaO10 nanosheets is exemplified for improving photocatalytic H2 evolution under visible light irradiation.
RSC Advances, 2022
A silver/titanium dioxide nanoplate (Ag/TiO 2 NP) photoelectrode was designed and fabricated from... more A silver/titanium dioxide nanoplate (Ag/TiO 2 NP) photoelectrode was designed and fabricated from vertically aligned TiO 2 nanoplates (NP) decorated with silver nanoparticles (NPs) through a simple hydrothermal synthesis and electrodeposition route. The electrodeposition times of Ag NPs on the TiO 2 NP were crucial for surface plasmon-driven photoelectrochemical (PEC) water splitting performance. The Ag/TiO 2 NP at the optimal deposition time of 5 min with a Ag element content of 0.53 wt% demonstrated a remarkably high photocurrent density of 0.35 mA cm À2 at 1.23 V vs. RHE under AM 1.5G illumination, which was 5 fold higher than that of the pristine TiO 2 NP. It was clear that the enhanced light absorption properties and PEC performance for Ag/TiO 2 NP could be effectively adjusted by simply controlling the loading amounts of metallic Ag NPs (average size of 10-30 nm) at different electrodeposition times. The superior PEC performance of the Ag/TiO 2 NP photoanode was attributed to the synergistic effects of the plasmonic Ag NPs and the TiO 2 nanoplate. Interestingly, the plasmonic effect of Ag NPs not only increased the visible-light response (l max ¼ 570 nm) of TiO 2 but also provided hot electrons to promote photocurrent generation and suppress charge recombination. Importantly, this study offers a potentially efficient strategy for the design and fabrication of a new type of TiO 2 hybrid nanostructure with a plasmonic enhancement for PEC water splitting.
RSC Advances
A dual-functional WO3/BiVO4 photoanode achieved remarkable photocurrent density, 6.85 mA cm−2 at ... more A dual-functional WO3/BiVO4 photoanode achieved remarkable photocurrent density, 6.85 mA cm−2 at 1.23 V vs. RHE and high efficiency for glycerol degradation.
Nano Energy, 2016
WO 3 nanoplate arrays with (002) oriented facets grown on fluorine doped SnO 2 (FTO) glass substr... more WO 3 nanoplate arrays with (002) oriented facets grown on fluorine doped SnO 2 (FTO) glass substrates are tailored by tuning the precursor solution via a facile hydrothermal method. A 2-step hydrothermal method leads to the preferential growth of WO 3 film with enriched (002) facets, which exhibits extraordinary photoelectrochemical (PEC) performance with a remarkable photocurrent density of 3.7 mA cm-2 at 1.23 V vs. revisable hydrogen electrode (RHE) under AM 1.5 G illumination without the use of any cocatalyst, corresponding to ~93% of the theoretical photocurrent of WO 3. Density functional theory (DFT) calculations together with experimental studies reveal that the enhanced photocatalytic activity and better photostability of the WO 3 films are attributed to the synergistic effect of highly reactive (002) facet 2 and nanoplate structure which facilitates the photo-induced charge carrier separation and suppresses the formation of peroxo-species. Without the use of oxygen evolution cocatalysts, the excellent PEC performance, demonstrated in this work, by simply tuning crystal facets and nanostructure of pristine WO 3 films may open up new opportunities in designing high performance photoanodes for PEC water splitting.
Physical Chemistry Chemical Physics, 2013
Applied Surface Science, 2017
Ag nanoparticle-decorated TiO 2 NWs were fabricated by a facile chemical method. Ag-decorated T... more Ag nanoparticle-decorated TiO 2 NWs were fabricated by a facile chemical method. Ag-decorated TiO 2 NWs was used as photoanode for PEC water splitting. The photoanode shows remarkable visible-light PEC water splitting performance.
Nanomaterials
ZnO and Aluminum doped ZnO nanoparticles (Al/ZnO NPs) were successfully synthesized by the sol-ge... more ZnO and Aluminum doped ZnO nanoparticles (Al/ZnO NPs) were successfully synthesized by the sol-gel method. Together with the effect of calcination temperatures (200, 300 and 400 °C) and Al dosage (1%, 3%, 5% and 10%) on structural, morphological and optical properties of Al/ZnO NPs, their photocatalytic degradation of methyl orange (MO) dye was investigated. The calcination temperatures at 200, 300 and 400 °C in forming structure of ZnO NPs led to spherical nanoparticle, nanorod and nanoflake structures with a well-crystalline hexagonal wurtzite, respectively. The ZnO NPs calcined at 200 °C exhibited the highest specific surface area and light absorption property, leading to the MO removal efficiency of 80% after 4 h under the Ultraviolet (UV) light irradiation. The MO removal efficiency was approximately two times higher than the nanoparticles calcined at 400 °C. Furthermore, the 5% Al/ZnO NPs exhibited superior MO removal efficiency of 99% in only 40 min which was approximately 20...
Journal of Hazardous Materials
International Journal of Food Science
The rising global population continues to threaten the world’s food security. The discovery of ne... more The rising global population continues to threaten the world’s food security. The discovery of new technologies to produce food of nutritional and functional properties is urgently needed. One beneficial food to humans of known nutritional value is the prebiotic levan. To address the problem, the present work is aimed at isolating levansucrase enzyme-producing microorganisms from traditional fermented food in Thailand. Bacterial colony morphology was observed for mucoidal consistency on culture plates. Isolated colonies were characterized morphologically by gram staining methods. Dinitrosalicylic acid (DNS) and thin-layer chromatography (TLC) reported the highest microbial enzyme activity of 8.51 IU/ml at 12 hours via hydrolysis and frutotransferase activities. Structural characterization of levan via Fourier-transform infrared spectroscopy (FTIR) and 1H and 13C nuclear magnetic resonance (NMR) spectroscopy showed β-(2,6)-fructofuranose linkages. The highest enzyme activity was exhi...
Progress in Natural Science: Materials International
Journal of Materials Science & Technology
Photocatalysis has attracted much attention in recent years due to its potential in solving energ... more Photocatalysis has attracted much attention in recent years due to its potential in solving energy and environmental issues. Even though numerous achievements have been made, the photocatalytic systems developed to date are still far from practical applications due to the low efficiency and poor durability. Efficient light absorption and charge separation are two of the key factors for the exploration of high performance photocatalytic systems, which is generally difficult to be obtained in a single photocatalyst. The combination of various materials to form heterojunctions provides an effective way to better harvest solar energy and to facilitate charge separation and transfer, thus enhancing the photocatalytic activity and stability. This review concisely summarizes the recent development of visible light responsive heterojunctions, including the preparation and performances of semiconductor/semiconductor junctions, semiconductor/cocatalyst junctions, semiconductor/metal junctions, semiconductor/non-metal junctions, and surface heterojunctions, and their mechanism for enhanced light harvesting and charge separation/transfer.
Dalton Trans.
A new type of boron-doped graphitic carbon nitride (B-g-C3N4) nanosheets was prepared by a benign... more A new type of boron-doped graphitic carbon nitride (B-g-C3N4) nanosheets was prepared by a benign one-pot thermal polycondensation process.
Applied Catalysis B: Environmental, 2017
A new type of visible light active composite containing exfoliated g-C3N4 nanosheets and Ca2Nb2Ta... more A new type of visible light active composite containing exfoliated g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets was prepared. Systematic studies reveal that the g-C3N4/Ca2Nb2TaO10 nanosheet composite with a mass ratio of 80:20 exhibits the best performance in photocatalytic H2 evolution under visible light-irradiation, which is more than 2.8 times out-performing bare g-C3N4 bulk. The enhancement of photocatalytic H2 evolution of the g-C3N4/Ca2Nb2TaO10 composite is attributed to the intimate interfacial connection and synergistic effect between g-C3N4 nanosheets and Ca2Nb2TaO10 nanosheets with cascading electrons for efficient charge recombination suppression. Highlights Novel g-C3N4/Ca2Nb2TaO10 nanosheet composite was simply prepared by exfoliation-reassembly method. The hybridization between the g-C3N4 and Ca2Nb2TaO10 nanosheets provides an intimate interfacial connection. The synergistic effect of g-C3N4 and Ca2Nb2TaO10 nanosheets is exemplified for improving photocatalytic H2 evolution under visible light irradiation.