通过在镍钴双金属氢氧化物(Ni-Co LDH)的合成体系中引入胺修饰板钛矿TiO2得到了Ni-Co LDH/TiO2复合光催化材料,并对其光催化降解环丙沙星(CIP)抗生素的活性进行了研究。扫描电子显微镜(SEM)显示Ni-Co LDH将棒状的板钛矿TiO2完全包裹,增...通过在镍钴双金属氢氧化物(Ni-Co LDH)的合成体系中引入胺修饰板钛矿TiO2得到了Ni-Co LDH/TiO2复合光催化材料,并对其光催化降解环丙沙星(CIP)抗生素的活性进行了研究。扫描电子显微镜(SEM)显示Ni-Co LDH将棒状的板钛矿TiO2完全包裹,增大了材料与环丙沙星分子的接触面积。当TiO2与LDH的摩尔比为1:4时,复合材料表现出最佳的催化活性且Ni-Co LDH/TiO2(1:4)在四次循环实验后仍未出现明显的活性下降,说明其具有优异的稳定性。光电化学结果证明这种结构为光催化环丙沙星降解提供了更多的活性位点,其优异的光生电子与空穴的分离和传输效率是其具有最佳催化活性的主要原因。Ni-Co LDH/brookite TiO2 composite is prepared by adding amine-modified TiO2 into the fabrication system of Ni-Co layered bimetallic hydroxide (Ni-Co LDH), and its photocatalytic degradation of ciprofloxacin (CIP) antibiotic is studied. Scanning electron microscopy (SEM) images show that Ni-Co LDH wrapped on the brookite TiO2 increases the contact area between the catalyst and ciprofloxacin molecules. It is found that when the mole ratio of TiO2 to Ni-Co LDH is 1:4, the composite exhibits the best catalytic activity, and the activity of Ni-Co LDH/TiO2(1:4) has no decrease significantly after four cycles tests, indicating that it has excellent stability. The photochemical results show that this structure provides more active sites for photocatalytic ciprofloxacin degradation, and its excellent separation and transfer efficiency of photogenerated electrons and holes are the main reason for its optimal catalytic activity.展开更多
A new kind of anti-oxidation inorganic nano-coating for the common low carbon steel was prepared. It included magnesite mineral, metallurgic dust and silicate adhesive as the main raw materials. The nano-coating could...A new kind of anti-oxidation inorganic nano-coating for the common low carbon steel was prepared. It included magnesite mineral, metallurgic dust and silicate adhesive as the main raw materials. The nano-coating could be sprayed directly onto the low carbon steel slab even though with hot surface as far as under 1000 ℃ . And at the same time, a compact thin nano-film was formed, and the film would inhibit the oxygen into the interface of the steel body and decrease the loss of weight because of oxidation. The loss was decreased by about 60% or more. The properties and mechanism of oxidation resistance of the coating were discussed through XRD, TG-DTA and SEM. The experimental results show that many reactions would happen among the companents of the coating and then many microspheres with the size of 80- 100nm generated in the system. By using the heat of the steel body, the silicate adhesive would interact with the microspheres, and the other components of the coating would be soft and sintered so that when the coating was sprayed onto the suface of the steel slab , the intact and compact film could be formed and adhesive with the steel body. Besides the special properties of anti- oxidation, the coating could prevent the volatilization of microelement in the steel such as silicate and carbon at a high temperature. So it can improve the quality and output of steel with this new kind of nano-coating.展开更多
Lithium-sulfur(Li-S)batteries with high energy density are considered promising energy storage devices for the next generation.Nevertheless,the shuttle effect and the passive layer between the separator and the electr...Lithium-sulfur(Li-S)batteries with high energy density are considered promising energy storage devices for the next generation.Nevertheless,the shuttle effect and the passive layer between the separator and the electrodes still seriously affect the cycle stability and life.Herein,a bimetallic Ni-Co metal-organic framework(MOF)with adsorption and catalytic synergism for polysulfides was successfully synthesized as an electrospinning separator sandwich for Li-S batteries.Introducing porous Ni-Co MOF coatings into the separator provides more adsorption catalytic sites for polysulfides,prevents their diffusion to the anode,and enhances sulfur utilization.Consequently,the improved Li-S batteries with a Ni-Co MOF@PAN(NCMP)electrospun separator delivered excellent rate performance and outstanding cycle stability,yielding an ultra-high initial capacity of 1560 mA h g^(-1)at 0.1 C.Notably,remarkable Li-S battery performance with a discharge capacity of 794 mA h g^(-1)(84.1%capacity retention)was obtained after500 cycles,while delivering a low capacity decay rate of 0.032%during long-term cycling(up to 500cycles)at 1 C.Surprisingly,even at the current density of 2 C,the capacity attenuation rate of 2000 cycles is only 0.034%per cycle.In addition,compared with the Celgard separator,the NCMP separator also had high thermal stability(keeping the separator outline at 200℃)that ensured battery safety and excellent electrolyte wettability(73%porosity and 535%electrolyte absorption)and significantly enhanced the ionic conductivity and Li^(+) transfer number,and protected the surface integrity of the anode.展开更多
Three-electrode plasma jet system consisting of a perforated dielectric tube with two outer and one floating inner electrodes was developed and employed for nano-coating processes of Si [1 0 0] wafer. Lowered gas brea...Three-electrode plasma jet system consisting of a perforated dielectric tube with two outer and one floating inner electrodes was developed and employed for nano-coating processes of Si [1 0 0] wafer. Lowered gas breakdown voltage, increasing plasma density and increased discharge current were achieved by using the floating inner electrode. The low temperature (Nonthermal) Atmospheric Pressure Plasma protective coating technique using precursor-containing gases (Ar, O2 and OMCTS mixture) which injected into Plasma Jet (APPJ), there are several techniques are introduced here to avoid substrate damage including increasing plasma density without increasing the kinetic energy of the ion bombardment. Furthermore some few precautions are given here to insure good media for silicon wafer prepared for coating.展开更多
In this paper, the superhydrophobic polyurethane sponge(SS-PU) was facilely fabricated by etching with Jones reagent to bind the nanoparticles of Ni-Co double layered oxides(LDOs) on the surface, and following modific...In this paper, the superhydrophobic polyurethane sponge(SS-PU) was facilely fabricated by etching with Jones reagent to bind the nanoparticles of Ni-Co double layered oxides(LDOs) on the surface, and following modification with n-dodecyl mercaptan(DDT). This method provides a new strategy to fabricate superhydrophobic PU sponge with a water contact angle of 157° for absorbing oil with low cost and in large scale. It exhibits the strong absorption capacity and highly selective characteristic for various kinds of oils which can be recycled by simple squeezing. Besides, the as-prepared sponge can deal with the floating and underwater oils, indicating its application value in handling oil spills and domestic oily wastewater. The good self-cleaning ability shows the potential to clear the pollutants due to the ultralow adhesion to water. Especially, the most important point is that the superhydrophobic sponge can continuously and effectively separate the oil/water mixture against the condition of turbulent disturbance by using our designed device system, which exhibit its good superhydrophobicity, strong stability.Furthermore, the SS-PU still maintained stable absorption performance after 150 cycle tests without losing capacity obviously, showing excellent durability in long-term operation and significant potential as an efficient absorbent in large-scale dispose of oily water.展开更多
A novel precursor of nickel-cobalt alloy powders with an appropriate Ni to Co molar ratio was prepared under selectively synthetic conditions. The composition and morphology of the precursor were characterized by X-ra...A novel precursor of nickel-cobalt alloy powders with an appropriate Ni to Co molar ratio was prepared under selectively synthetic conditions. The composition and morphology of the precursor were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared spectrometry （FT-IR） and energy dispersive spectrometry （EDS）. The effects of pH value, reaction temperature, metal ion concentrations and surfactant on the morphology and the dispersion of precursor were investigated. The results show that the morphology of precursor depends on ammonia content in the precursor. A fibriform precursor is a complicated ammonia-containing nickel-cobalt oxalate. The uniform shape-controlled fibrous precursor is obtained under the following optimum conditions： ammonia as complex agent as well as pH adjustor, oxalate as coprecipitator, 50-65 °C of reaction temperature, 0.5-0.8 mol/L of total concentration of Ni2＋ and Co2＋, PVP as dispersant, and pH 8.0-8.4.展开更多
文摘通过在镍钴双金属氢氧化物(Ni-Co LDH)的合成体系中引入胺修饰板钛矿TiO2得到了Ni-Co LDH/TiO2复合光催化材料,并对其光催化降解环丙沙星(CIP)抗生素的活性进行了研究。扫描电子显微镜(SEM)显示Ni-Co LDH将棒状的板钛矿TiO2完全包裹,增大了材料与环丙沙星分子的接触面积。当TiO2与LDH的摩尔比为1:4时,复合材料表现出最佳的催化活性且Ni-Co LDH/TiO2(1:4)在四次循环实验后仍未出现明显的活性下降,说明其具有优异的稳定性。光电化学结果证明这种结构为光催化环丙沙星降解提供了更多的活性位点,其优异的光生电子与空穴的分离和传输效率是其具有最佳催化活性的主要原因。Ni-Co LDH/brookite TiO2 composite is prepared by adding amine-modified TiO2 into the fabrication system of Ni-Co layered bimetallic hydroxide (Ni-Co LDH), and its photocatalytic degradation of ciprofloxacin (CIP) antibiotic is studied. Scanning electron microscopy (SEM) images show that Ni-Co LDH wrapped on the brookite TiO2 increases the contact area between the catalyst and ciprofloxacin molecules. It is found that when the mole ratio of TiO2 to Ni-Co LDH is 1:4, the composite exhibits the best catalytic activity, and the activity of Ni-Co LDH/TiO2(1:4) has no decrease significantly after four cycles tests, indicating that it has excellent stability. The photochemical results show that this structure provides more active sites for photocatalytic ciprofloxacin degradation, and its excellent separation and transfer efficiency of photogenerated electrons and holes are the main reason for its optimal catalytic activity.
文摘A new kind of anti-oxidation inorganic nano-coating for the common low carbon steel was prepared. It included magnesite mineral, metallurgic dust and silicate adhesive as the main raw materials. The nano-coating could be sprayed directly onto the low carbon steel slab even though with hot surface as far as under 1000 ℃ . And at the same time, a compact thin nano-film was formed, and the film would inhibit the oxygen into the interface of the steel body and decrease the loss of weight because of oxidation. The loss was decreased by about 60% or more. The properties and mechanism of oxidation resistance of the coating were discussed through XRD, TG-DTA and SEM. The experimental results show that many reactions would happen among the companents of the coating and then many microspheres with the size of 80- 100nm generated in the system. By using the heat of the steel body, the silicate adhesive would interact with the microspheres, and the other components of the coating would be soft and sintered so that when the coating was sprayed onto the suface of the steel slab , the intact and compact film could be formed and adhesive with the steel body. Besides the special properties of anti- oxidation, the coating could prevent the volatilization of microelement in the steel such as silicate and carbon at a high temperature. So it can improve the quality and output of steel with this new kind of nano-coating.
基金supported by the 2022 Yeungnam University Research Grant。
文摘Lithium-sulfur(Li-S)batteries with high energy density are considered promising energy storage devices for the next generation.Nevertheless,the shuttle effect and the passive layer between the separator and the electrodes still seriously affect the cycle stability and life.Herein,a bimetallic Ni-Co metal-organic framework(MOF)with adsorption and catalytic synergism for polysulfides was successfully synthesized as an electrospinning separator sandwich for Li-S batteries.Introducing porous Ni-Co MOF coatings into the separator provides more adsorption catalytic sites for polysulfides,prevents their diffusion to the anode,and enhances sulfur utilization.Consequently,the improved Li-S batteries with a Ni-Co MOF@PAN(NCMP)electrospun separator delivered excellent rate performance and outstanding cycle stability,yielding an ultra-high initial capacity of 1560 mA h g^(-1)at 0.1 C.Notably,remarkable Li-S battery performance with a discharge capacity of 794 mA h g^(-1)(84.1%capacity retention)was obtained after500 cycles,while delivering a low capacity decay rate of 0.032%during long-term cycling(up to 500cycles)at 1 C.Surprisingly,even at the current density of 2 C,the capacity attenuation rate of 2000 cycles is only 0.034%per cycle.In addition,compared with the Celgard separator,the NCMP separator also had high thermal stability(keeping the separator outline at 200℃)that ensured battery safety and excellent electrolyte wettability(73%porosity and 535%electrolyte absorption)and significantly enhanced the ionic conductivity and Li^(+) transfer number,and protected the surface integrity of the anode.
文摘Three-electrode plasma jet system consisting of a perforated dielectric tube with two outer and one floating inner electrodes was developed and employed for nano-coating processes of Si [1 0 0] wafer. Lowered gas breakdown voltage, increasing plasma density and increased discharge current were achieved by using the floating inner electrode. The low temperature (Nonthermal) Atmospheric Pressure Plasma protective coating technique using precursor-containing gases (Ar, O2 and OMCTS mixture) which injected into Plasma Jet (APPJ), there are several techniques are introduced here to avoid substrate damage including increasing plasma density without increasing the kinetic energy of the ion bombardment. Furthermore some few precautions are given here to insure good media for silicon wafer prepared for coating.
基金the financial support from National Key Research & Development Program of China (2017B0602702)。
文摘In this paper, the superhydrophobic polyurethane sponge(SS-PU) was facilely fabricated by etching with Jones reagent to bind the nanoparticles of Ni-Co double layered oxides(LDOs) on the surface, and following modification with n-dodecyl mercaptan(DDT). This method provides a new strategy to fabricate superhydrophobic PU sponge with a water contact angle of 157° for absorbing oil with low cost and in large scale. It exhibits the strong absorption capacity and highly selective characteristic for various kinds of oils which can be recycled by simple squeezing. Besides, the as-prepared sponge can deal with the floating and underwater oils, indicating its application value in handling oil spills and domestic oily wastewater. The good self-cleaning ability shows the potential to clear the pollutants due to the ultralow adhesion to water. Especially, the most important point is that the superhydrophobic sponge can continuously and effectively separate the oil/water mixture against the condition of turbulent disturbance by using our designed device system, which exhibit its good superhydrophobicity, strong stability.Furthermore, the SS-PU still maintained stable absorption performance after 150 cycle tests without losing capacity obviously, showing excellent durability in long-term operation and significant potential as an efficient absorbent in large-scale dispose of oily water.
基金Project (20090162120080) supported by Doctoral Fund of Ministry of Education, ChinaProject (20070410989) supported by China Postdoctoral Science FoundationProject(748310000) supported by Central South University Science Foundation for Youths, China
文摘A novel precursor of nickel-cobalt alloy powders with an appropriate Ni to Co molar ratio was prepared under selectively synthetic conditions. The composition and morphology of the precursor were characterized by X-ray diffractometry （XRD）, scanning electron microscopy （SEM）, Fourier transform infrared spectrometry （FT-IR） and energy dispersive spectrometry （EDS）. The effects of pH value, reaction temperature, metal ion concentrations and surfactant on the morphology and the dispersion of precursor were investigated. The results show that the morphology of precursor depends on ammonia content in the precursor. A fibriform precursor is a complicated ammonia-containing nickel-cobalt oxalate. The uniform shape-controlled fibrous precursor is obtained under the following optimum conditions： ammonia as complex agent as well as pH adjustor, oxalate as coprecipitator, 50-65 °C of reaction temperature, 0.5-0.8 mol/L of total concentration of Ni2＋ and Co2＋, PVP as dispersant, and pH 8.0-8.4.
