Chemical effects in different aqueous solutions induced by plasma with glow discharge electrolysis (GDE) and contact glow discharge electrolysis (CGDE) are described in this paper. The experimental and discharge char...Chemical effects in different aqueous solutions induced by plasma with glow discharge electrolysis (GDE) and contact glow discharge electrolysis (CGDE) are described in this paper. The experimental and discharge characteristics are also reviewed. These are followed by a discussion of their mechanisms of both anodic and cathodic CGDE..展开更多
Degradation of α-naphthol induced by plasma in aqueous solution was investigated in different initial concentration with contact glow discharge electrolysis(CGDE). The results showed that the degradation of α-naphth...Degradation of α-naphthol induced by plasma in aqueous solution was investigated in different initial concentration with contact glow discharge electrolysis(CGDE). The results showed that the degradation of α-naphthol obeyed the first-rate law. Some of predominant products were analyzed by a high performance liquid chromatography (HPLC). A path of α-naphthol disappearance caused by plasma was proposed according to the detected intermediate products.展开更多
The basis of the hydrophobicity of lanthanide rare earth oxides(REOs)has been the subject of considerable debate.To explore this question,the wetting behaviors and surface compositions of hierarchicallystructured Yb_(...The basis of the hydrophobicity of lanthanide rare earth oxides(REOs)has been the subject of considerable debate.To explore this question,the wetting behaviors and surface compositions of hierarchicallystructured Yb_(2)o_(3)(one of the REOs)coatings and non-REO Al_(2)o_(3)coatings deposited via solution precursor plasma spray process were investigated in this work.The Yb_(2)o_(3)coatings were subjected to a number of post-deposition treatments including vacuum(1-15 Pa)treatment,Ar-plasma treatment,heat treatment(400℃),long-time air exposure and ultra-high vacuum(1×10^(-7)Pa)treatment.Subsequent characterization showed that different post-deposition treatments resulted in different wetting behavior for the Yb_(2)o_(3)coatings which correlated with the content of hydrocarbon on the surface.Yb_(2)o_(3)coatings exhibited reversible transitions between superhydrophobicity after vacuum treatment and superhydrophilicity after Ar-plasma or heat treatment,linked to hydrocarbon adsorption onto and desorption from the surface.Yb_(2)o_(3)coatings after long-time air exposure and ultra-high vacuum treatment both remained hydrophilic and showed a smaller hydrocarbon content than coatings after vacuum treatment.Al_(2)o_(3)coatings with hierarchical surface structures similar to the Yb_(2)o_(3)coatings showed an increase in WCA to only-170 after the same vacuum treatment,indicating the REO has a much higher affinity for hydrocarbon adsorption than Al_(2)o_(3),and that the content of hydrocarbon adsorbed on the surface of the REO determined the wetting behavior.展开更多
In this paper, the AC-excited helium discharges generated between the powered needle electrode enclosed in a conical quartz tube and the grounded de-ionized water electrode are investigated. The current and voltage wa...In this paper, the AC-excited helium discharges generated between the powered needle electrode enclosed in a conical quartz tube and the grounded de-ionized water electrode are investigated. The current and voltage waveforms exhibit a transition from the glow-like to streamer-like mode discharges, which forms a stable cone-shaped structure at the gas-liquid interface. In this region, the air and water vapor diffusion initiate various physical-chemical processes leading to substantial changes of the primary species emission intensities （e.g., OH, N2, NO, and O） and the rotational temperatures. The experimentally measured rotational temperature at the gas-liquid interface is 870 K from the Nz（C-B） band with a power input of 26 W. With the prolongation of the discharge time, significant changes in the discharge voltage and current, discharge emission patterns, instantaneous concentrations of the secondary species （e.g., H202, NO2, and NO3） in the liquid phase, pH values and electrical conductivities of the liquids are observed experimentally. The present study is helpful for deepening the understandings to the basic physical-chemical processes in the discharges in contact with liquids, especially to those occurring in the vicinity of the gas-liquid interface, and also for promoting existing and potential applications of such type of discharges in the fields of environmental protection, biomedicine, agriculture, and so on.展开更多
With the development of society,human beings are facing environmental problems and an energy crisis worldwide.In this context,photocatalysis and electrocatalysis represent promising technologies to help solving these ...With the development of society,human beings are facing environmental problems and an energy crisis worldwide.In this context,photocatalysis and electrocatalysis represent promising technologies to help solving these issues.Up to now,most of the catalysts intended for these usages are prepared via time-consuming wet-chemical approaches,e.g.hydrothermal or sol–gel methods.Moreover,these techniques produce powdery catalysts which need not only a post-filtration step,but also a shaping by a binder for their final applications,which makes the manufacturing cumbersome.Thermal spraying is currently a well-established deposition technique that is capable of elaborating a wide series of functional coatings based on all classes of materials(metals,polymers,ceramics)and featuring tunable compositions as well as micro-and nanostructures.In particular,thermal involving liquid feedstock,and more specifically precursor solutions or suspensions,have allowed generating a wide range of coating thicknesses,from the tenmicron to the submicron/nano scale,increasing thereby the possibilities for enhancing catalytic performances.The present review sets out marking researches relating to the preparation and testing of(i)some photocatalytic coatings intended for the degradation of aqueous organic pollutants and(ii)electrocatalytic coatings investigated as potential energy storage devices.This paper will not only deal with the preparation of catalysts via different thermal spray processes,but also will cover the adjustment of phase compositions and microstructures that are rendered possible when using liquid feedstock thermal spray techniques with the prospect of optimizing the catalytic performances.展开更多
文摘Chemical effects in different aqueous solutions induced by plasma with glow discharge electrolysis (GDE) and contact glow discharge electrolysis (CGDE) are described in this paper. The experimental and discharge characteristics are also reviewed. These are followed by a discussion of their mechanisms of both anodic and cathodic CGDE..
基金a grant from the Science and Technology Key Project of Education Ministry, China and KJCX-01 of Northwest Normal University, Chi
文摘Degradation of α-naphthol induced by plasma in aqueous solution was investigated in different initial concentration with contact glow discharge electrolysis(CGDE). The results showed that the degradation of α-naphthol obeyed the first-rate law. Some of predominant products were analyzed by a high performance liquid chromatography (HPLC). A path of α-naphthol disappearance caused by plasma was proposed according to the detected intermediate products.
基金supported by Natural Science and Engineering Research Council Canada Discovery Grants Program(No.RGPIN-2015-06377(TWC))Natural Science and Engineering Research Council Canada Green Surface Engineering for Advanced Manufacturing(Green-SEAM)Strategic Network。
文摘The basis of the hydrophobicity of lanthanide rare earth oxides(REOs)has been the subject of considerable debate.To explore this question,the wetting behaviors and surface compositions of hierarchicallystructured Yb_(2)o_(3)(one of the REOs)coatings and non-REO Al_(2)o_(3)coatings deposited via solution precursor plasma spray process were investigated in this work.The Yb_(2)o_(3)coatings were subjected to a number of post-deposition treatments including vacuum(1-15 Pa)treatment,Ar-plasma treatment,heat treatment(400℃),long-time air exposure and ultra-high vacuum(1×10^(-7)Pa)treatment.Subsequent characterization showed that different post-deposition treatments resulted in different wetting behavior for the Yb_(2)o_(3)coatings which correlated with the content of hydrocarbon on the surface.Yb_(2)o_(3)coatings exhibited reversible transitions between superhydrophobicity after vacuum treatment and superhydrophilicity after Ar-plasma or heat treatment,linked to hydrocarbon adsorption onto and desorption from the surface.Yb_(2)o_(3)coatings after long-time air exposure and ultra-high vacuum treatment both remained hydrophilic and showed a smaller hydrocarbon content than coatings after vacuum treatment.Al_(2)o_(3)coatings with hierarchical surface structures similar to the Yb_(2)o_(3)coatings showed an increase in WCA to only-170 after the same vacuum treatment,indicating the REO has a much higher affinity for hydrocarbon adsorption than Al_(2)o_(3),and that the content of hydrocarbon adsorbed on the surface of the REO determined the wetting behavior.
基金supported by the Major Science and Technology Program for Water Pollution Control and Treatment(No.2014ZX07215-001)partly by National Natural Science Foundation of China(Nos.11475103,51578309)the Chinese Scholarship Council for the financial assistance of my PhD program in Tsinghua University of China
文摘In this paper, the AC-excited helium discharges generated between the powered needle electrode enclosed in a conical quartz tube and the grounded de-ionized water electrode are investigated. The current and voltage waveforms exhibit a transition from the glow-like to streamer-like mode discharges, which forms a stable cone-shaped structure at the gas-liquid interface. In this region, the air and water vapor diffusion initiate various physical-chemical processes leading to substantial changes of the primary species emission intensities （e.g., OH, N2, NO, and O） and the rotational temperatures. The experimentally measured rotational temperature at the gas-liquid interface is 870 K from the Nz（C-B） band with a power input of 26 W. With the prolongation of the discharge time, significant changes in the discharge voltage and current, discharge emission patterns, instantaneous concentrations of the secondary species （e.g., H202, NO2, and NO3） in the liquid phase, pH values and electrical conductivities of the liquids are observed experimentally. The present study is helpful for deepening the understandings to the basic physical-chemical processes in the discharges in contact with liquids, especially to those occurring in the vicinity of the gas-liquid interface, and also for promoting existing and potential applications of such type of discharges in the fields of environmental protection, biomedicine, agriculture, and so on.
基金supported by the Natural Science Foundation of Jiangsu Higher Education Institution of China(Grant No.20KJB430003)the open project of Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials(Grant No.GFST2021KF01)Humboldt Fellowship for Postdoctoral Researcher(Dr.Zexin YU).
文摘With the development of society,human beings are facing environmental problems and an energy crisis worldwide.In this context,photocatalysis and electrocatalysis represent promising technologies to help solving these issues.Up to now,most of the catalysts intended for these usages are prepared via time-consuming wet-chemical approaches,e.g.hydrothermal or sol–gel methods.Moreover,these techniques produce powdery catalysts which need not only a post-filtration step,but also a shaping by a binder for their final applications,which makes the manufacturing cumbersome.Thermal spraying is currently a well-established deposition technique that is capable of elaborating a wide series of functional coatings based on all classes of materials(metals,polymers,ceramics)and featuring tunable compositions as well as micro-and nanostructures.In particular,thermal involving liquid feedstock,and more specifically precursor solutions or suspensions,have allowed generating a wide range of coating thicknesses,from the tenmicron to the submicron/nano scale,increasing thereby the possibilities for enhancing catalytic performances.The present review sets out marking researches relating to the preparation and testing of(i)some photocatalytic coatings intended for the degradation of aqueous organic pollutants and(ii)electrocatalytic coatings investigated as potential energy storage devices.This paper will not only deal with the preparation of catalysts via different thermal spray processes,but also will cover the adjustment of phase compositions and microstructures that are rendered possible when using liquid feedstock thermal spray techniques with the prospect of optimizing the catalytic performances.
