Atmospheric Pressure Oxygen Cold Plasma for Synthesizing Au/TiO<sub>2</sub> Catalysts: Effect of Discharge Voltage and Discharge Time

Zhang, Xiuling; Xu, Weiwei; Duan, Dongzhi; Park, Dong-Wha; Di, Lanbo

doi:10.1109/tps.2018.2837646

Cited by 11 publications

(6 citation statements)

References 29 publications

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“…The excellent performance of Au/P25-O 2 P is mainly attributed to the efficient decomposition of gold precursor species, the small size of gold nanoparticles (3.1 ± 1.8 nm), and the high concentration of [O] s species (18.9%). Zhang et al [143] further investigated the effect of discharge voltage and discharge time on the structure and performance of the Au/TiO 2 catalytic material by AP O 2 plasma. There is little difference in the size of gold nanoparticles in the Au/TiO 2 catalysts.…”

Section: Cold Plasma Reduction Of Catalytic Materialsmentioning

confidence: 99%

Cold plasma treatment of catalytic materials: a review

Di¹,

Zhang²,

Zhang³

et al. 2021

J. Phys. D: Appl. Phys.

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Catalytic materials play important roles in chemical, energy, and environmental fields. The exhaustion of fossil fuels and the resulting deteriorative environment have become worldwide problems to be solved urgently. Therefore, treatment of catalytic materials by a green process is required for a sustainable future, and the atom efficiency of the catalytic materials should be improved at the same time. Cold plasma is rich in high-energy electrons and active species, and the gas temperature can be close to room temperature. It has been proved to be a fast, facile, and environmentally friendly novel method for treating catalytic materials, and has aroused increasing research interests. First, plasma treatment can achieve the reduction, deposition, combination, and decomposition of active components during the preparation of catalytic materials. The fast, low-temperature plasma process with a strong electric field in it leads to different types of nucleation and crystal growth compared to conventional thermal methods. Correspondingly, the synthesized catalytic materials generally possess smaller particle sizes and controlled structure depending on the plasma processing parameters and the materials to be treated, which can enhance their activity and stability. Second, plasma treatment can achieve the modification, doping, etching, and exfoliation of the catalytic materials, which can tune the surface properties and electronic structures of the catalytic materials to expose more active sites. Third, plasma treatment can regenerate deactivated catalytic materials by removing the carbon deposits or other poisons, and reconstruction of the destroyed structure. This work reviews the current status of research on cold plasma treatment of catalytic materials. The focus is on physical and chemical processes during plasma processing, the processing mechanism of the catalytic materials, as well as the future challenges in this filed.

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Section: Cold Plasma Reduction Of Catalytic Materialsmentioning

confidence: 99%

Cold plasma treatment of catalytic materials: a review

Di¹,

Zhang²,

Zhang³

et al. 2021

J. Phys. D: Appl. Phys.

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“…AP cold plasma activation with oxygen, argon, and hydrogen as working gas has no significance influence on the size of gold nanoparticles ( D Au = 3.0–3.3 nm). AP cold plasma activation of the Au/P25-As catalysts may not only lead to the decomposition of the gold precursor species and formation of active [O] s species, but also can result in the removal of active [O] s species after longer AP cold plasma treatment time [ 29 ]. The decomposed gold species containing oxidized and metallic gold species can be transformed into active metallic gold species [ 26 ].…”

Section: Resultsmentioning

confidence: 99%

“…In previous work, we adopted AP hydrogen and oxygen cold plasma to synthesize Au/TiO 2 catalysts, and obtained high performance gold catalysts [ 27 , 28 ]. The effect of discharge time and discharge voltage on the structure and property of the Au/TiO 2 catalysts are also investigated and discussed [ 29 ]. The results indicate that the small size of gold nanoparticles and the high concentration of active surface oxygen species are the main reasons for the high performance.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas

Zhang

et al. 2018

Nanomaterials

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Commercial TiO2 (P25) supported gold (Au/P25) attracts increasing attention. In this work, atmospheric-pressure (AP) cold plasma was employed to activate the Au/P25-As catalyst prepared by a modified impregnation method. The influence of cold plasma working gas (oxygen, argon, hydrogen, and air) on the structure and performance of the obtained Au/P25 catalysts was investigated. X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and X-ray spectroscopy (XPS) were adopted to characterize the Au/P25 catalysts. CO oxidation was used as model reaction probe to test the Au/P25 catalyst. XRD results reveal that supporting gold and AP cold plasma activation have little effect on the P25 support. CO oxidation activity over the Au/P25 catalysts follows the order: Au/P25-O2P > Au/P25-As > Au/P25-ArP ≈ Au/P25-H2P > Au/P25-AirP. Au/P25-AirP presents the poorest CO oxidation catalytic activity among the Au/P25 catalysts, which may be ascribed to the larger size of gold nanoparticles, low concentration of active [O]s, as well as the poisoning [NOx]s. The poor catalytic performance of Au/P25-ArP and Au/P25-H2P is ascribed to the lower concentration of [O]s species. 100% CO conversion temperatures for Au/P25-O2P is 40 °C, which is 30 °C lower than that over the as-prepared Au/P25-As catalyst. The excellent CO oxidation activity over Au/P25-O2P is mainly attributed to the efficient decomposition of gold precursor species, small size of gold nanoparticles, and the high concentration of [O]s species.

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“…Metal nanoparticles play a crucial role in a range of applications due to the remarkable improvements in the electronic [1], chemical [2], optical [3], and biological properties [4]. Recent advancements in nanotechnology have attracted interest in the development of new methods to synthesize metal nanoparticles [5,6]. The solution method is still used frequently in newly developed synthesis methods, such as irradiation method [7] and bio-synthesis [8], because nanoparticles generated in solution can form stable colloidal dispersions.…”

Section: Introductionmentioning

confidence: 99%

Simple reactor for the synthesis of silver nanoparticles with the assistance of ethanol by gas–liquid discharge plasma

Pan

Kim

Park

2019

Plasma Sci. Technol.

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Atmospheric pressure plasma technology is gaining increasing importance because it is a simple and tunable synthesis process for the production of metallic nanoparticles. In addition to the development of the power supply, improving the reactor is also one of the main strategies to enhance the utility. In this study, a simple reactor for the gas-liquid discharge plasma induced by argon gas was applied to synthesize silver nanoparticles from silver nitrate (AgNO 3 ) in solution. An AC power supply with a peak voltage of 3.5 kV was used. The frequency and on-time were set to 50 kHz and 2.5 μs, respectively. The oscilloscope showed that the rising time was approximately 2 μs. The ethanol was used as the source for the reactive reducing agent. No more additional components existed in the solution during the discharge and neither of the electrodes was in contact with the treated solution. The temperature increased by 10 °C within 1 min without a cooling system. Carbon was the main impurity and was expected to be produced from the decomposition of the organics under the plasma. The elevated temperature decreased the organic by-products by evaporation and could also decrease the production of carbon. Transmission electron microscopy showed that the spherical silver nanoparticles with a size of approximately 10 nm were synthesized with a crystal structure and that a low concentration of ethanol prefers the production of the mono-dispersed colloid.

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Atmospheric Pressure Oxygen Cold Plasma for Synthesizing Au/TiO₂ Catalysts: Effect of Discharge Voltage and Discharge Time

Cited by 11 publications

References 29 publications

Cold plasma treatment of catalytic materials: a review

Cold plasma treatment of catalytic materials: a review

Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas

Simple reactor for the synthesis of silver nanoparticles with the assistance of ethanol by gas–liquid discharge plasma

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Atmospheric Pressure Oxygen Cold Plasma for Synthesizing Au/TiO2 Catalysts: Effect of Discharge Voltage and Discharge Time

Cited by 11 publications

References 29 publications

Cold plasma treatment of catalytic materials: a review

Cold plasma treatment of catalytic materials: a review

Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas

Simple reactor for the synthesis of silver nanoparticles with the assistance of ethanol by gas–liquid discharge plasma

Contact Info

Product

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Atmospheric Pressure Oxygen Cold Plasma for Synthesizing Au/TiO₂ Catalysts: Effect of Discharge Voltage and Discharge Time