The properties of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 composite anode for zinc electrowinning were investigated. The electrochemical performance was studied by Tafel polarization curves（Tafel）, e...The properties of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 composite anode for zinc electrowinning were investigated. The electrochemical performance was studied by Tafel polarization curves（Tafel）, electrochemical impedance spectroscopy（EIS） and corrosion rate obtained in an acidic zinc sulfate electrolyte solution. Scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and energy dispersive X-ray spectroscopy（EDXS） were used to observe the microstructural features of coating. Anodes of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2, Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC, Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-ZrO2, and Pb-1%Ag anodes were also researched. The results indicated that the Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 showed the best catalytic activity and corrosion resistant performance; the intensity of diffraction peak exhibited the highest value as well as a new PbWO4 phase; the content of WC and ZrO2 in coating showed the highest value as well as the finest grain size.展开更多
Alumina fiber-reinforced zinc alloy composites were manufactured by squeeze casting, and the eutectic transformation in the zinc alloy composites was studied. The results indicate that there is a fine and close interf...Alumina fiber-reinforced zinc alloy composites were manufactured by squeeze casting, and the eutectic transformation in the zinc alloy composites was studied. The results indicate that there is a fine and close interface between the fiber and the matrix, and the alloy elements can improve the combination between the fibers and the matrix in the composites. The fibers can serve as the sites of heterogeneous nucleation of the eutectic in the zinc alloy during the solidification of the composites, and the silicon on the interface between the fibers and the matrix plays a leading role during the coupled growth of the eutectic so that the eutectic transformation of the composites consists of Al-Si eutectic transformation and Zn-AI eutectic transformation.展开更多
We demonstrate that the electroluminescent performances of organic light-emitting diodes are significantly improved by employing a zinc phthalocyanine （ZnPc）-based composite hole transport layer （c-HTL）. The optim...We demonstrate that the electroluminescent performances of organic light-emitting diodes are significantly improved by employing a zinc phthalocyanine （ZnPc）-based composite hole transport layer （c-HTL）. The optimum ris-（8-hydroxyquinoline）aluminum （Alq3）-based organic light-emitting diode with a c-HTL exhibits a lower turn-on voltage of 2.8 V, a higher maximum current efficiency of 3.40 cd/A and a higher maximum power efficiency of 1.91 lm/W, which are superior to those of the conventional device （turn-on voltage of 3.8 V, maximum current efficiency of 2.60 cd/A, and maximum power efficiency of 1.21 lm/W）. We systematically studied the effects of different kinds of N’-diphenyl-N,N’-bis（1-naphthyl）（1,1’-biphenyl）-4,4’diamine （NPB）：ZnPc c-HTL. Meanwhile, we also investigate their mechanisms different from that in the case of using ZnPc as buffer layer. The specific analysis is based on the absorption spectra of the hole transporting material and current density–voltage characteristics of the corresponding hole-only devices.展开更多
The high band gap of zinc oxide(ZnO)has significantly limited its potential application for organic contaminant removal in photocatalysis.In this study,ZnO/halloysites(HNTs)composites(ZnO/HNTs)were prepared using a hi...The high band gap of zinc oxide(ZnO)has significantly limited its potential application for organic contaminant removal in photocatalysis.In this study,ZnO/halloysites(HNTs)composites(ZnO/HNTs)were prepared using a high-temperature calcination method to enhance the removal of tetracycline hydrochloride(TCH).The experimental results demonstrated that the band gap of ZnO/HNTs decreased to 3.12 eV,compared to 3.21 eV for pure ZnO.The observed removal rate(k_(obs))of TCH in the ZnO/HNTs/vis system was 1.90×10^(-2) min^(-1),significantly higher than the rates in the HNTs/vis(1.25×10^(-3)min^(-1))and ZnO/vis(1.13×10^(-2) min^(-1))systems.Additionally,ZnO/HNTs exhibited strong resistance to coexisting natural organic and inorganic matter,maintaining high pollutant removal efficiency in natural water samples.The ZnO/HNTs/vis system also effectively removed other common organic pollutants,such as ciprofloxacin and methylene blue.Cycle tests indicated that the ZnO/HNTs/vis system retained 65.57%of its original efficiency,demonstrating good reusability and versatility.Scavenging and electron paramagnetic resonance experiments identified that h+was the primary species in the ZnO/HNTs/vis system,with other species playing auxiliary roles in TCH degradation.This study provides valuable insights into the design of novel ZnO-based photocatalysts for the degradation of organic pollutants in water.展开更多
Two different morphologies of ZnO（lotus-shaped, rod-shaped） and ZnO/PVDF composite materials were prepared. The morphologies of ZnO and composite materials were characterized by scanning electron microscopy（SEM） a...Two different morphologies of ZnO（lotus-shaped, rod-shaped） and ZnO/PVDF composite materials were prepared. The morphologies of ZnO and composite materials were characterized by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. Fourier transform infrared spectroscopy（FT-IR）, thermal gravimetry（TG）, and X-ray diffraction（XRD） were also used to characterize the chemical structures and phase composites of ZnO and ZnO/PVDF composite materials. Breakdown voltage, dielectric constant and dielectric loss of ZnO/PVDF composite materials were also tested. Microstructure analysis showed that ZnO nanoparticles dispersed uniformly in the matrix. And the dielectric constant expresses a significantly improvement while the dielectric loss and breakdown voltage expresses no significant change. Moreover, dielectric constant keeps an improvement tendency with increasing content of ZnO.展开更多
Rechargeable aqueous zinc-based batteries(RAZBs)are rapidly developing as very promising energy storage devices for both grid-scale and portable applications,thanks to their inherent safety,cost effectiveness,environm...Rechargeable aqueous zinc-based batteries(RAZBs)are rapidly developing as very promising energy storage devices for both grid-scale and portable applications,thanks to their inherent safety,cost effectiveness,environmental friendliness,and competitive energy density.Increasing efforts have been devoted to alleviating the formidable issues of nonuniform plating/stripping,corrosion,and hydrogen evolution related to zinc anode.Significant progress has been made in reversibility and cyclic stability of RAZBs.However,the problems have yet to be resolved well.In this review,strategies for zinc composition and structure optimization and anode–electrolyte interface construction are summarized.Perspectives for the further development of highperformance zinc anodes for RAZBs are outlined to guide future research and to accelerate their commercialization process.展开更多
基金Funded by the National Natural Science Foundation of China(Nos.51564029,51504111,51504231,51364019)the Key Project of Yunnan Province Applied Basic Research Plan of China(No.2014FA024)
文摘The properties of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 composite anode for zinc electrowinning were investigated. The electrochemical performance was studied by Tafel polarization curves（Tafel）, electrochemical impedance spectroscopy（EIS） and corrosion rate obtained in an acidic zinc sulfate electrolyte solution. Scanning electron microscopy（SEM）, X-ray diffraction（XRD）, and energy dispersive X-ray spectroscopy（EDXS） were used to observe the microstructural features of coating. Anodes of Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2, Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC, Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-ZrO2, and Pb-1%Ag anodes were also researched. The results indicated that the Al/conductive coating/α-PbO2-CeO2-TiO2/β-PbO2-WC-ZrO2 showed the best catalytic activity and corrosion resistant performance; the intensity of diffraction peak exhibited the highest value as well as a new PbWO4 phase; the content of WC and ZrO2 in coating showed the highest value as well as the finest grain size.
文摘Alumina fiber-reinforced zinc alloy composites were manufactured by squeeze casting, and the eutectic transformation in the zinc alloy composites was studied. The results indicate that there is a fine and close interface between the fiber and the matrix, and the alloy elements can improve the combination between the fibers and the matrix in the composites. The fibers can serve as the sites of heterogeneous nucleation of the eutectic in the zinc alloy during the solidification of the composites, and the silicon on the interface between the fibers and the matrix plays a leading role during the coupled growth of the eutectic so that the eutectic transformation of the composites consists of Al-Si eutectic transformation and Zn-AI eutectic transformation.
基金Project supported by the National Key Basic Research and Development Program of China(Grant No.2010CB327701)the National Natural Science Foundation of China(Grant No.61275033)
文摘We demonstrate that the electroluminescent performances of organic light-emitting diodes are significantly improved by employing a zinc phthalocyanine （ZnPc）-based composite hole transport layer （c-HTL）. The optimum ris-（8-hydroxyquinoline）aluminum （Alq3）-based organic light-emitting diode with a c-HTL exhibits a lower turn-on voltage of 2.8 V, a higher maximum current efficiency of 3.40 cd/A and a higher maximum power efficiency of 1.91 lm/W, which are superior to those of the conventional device （turn-on voltage of 3.8 V, maximum current efficiency of 2.60 cd/A, and maximum power efficiency of 1.21 lm/W）. We systematically studied the effects of different kinds of N’-diphenyl-N,N’-bis（1-naphthyl）（1,1’-biphenyl）-4,4’diamine （NPB）：ZnPc c-HTL. Meanwhile, we also investigate their mechanisms different from that in the case of using ZnPc as buffer layer. The specific analysis is based on the absorption spectra of the hole transporting material and current density–voltage characteristics of the corresponding hole-only devices.
基金financially supported by the National Natural Science Foundation of China(Nos.52270149,51908528,2200013)Natural Science Foundation of Henan Province,China(No.242300421443)+1 种基金The Science and Technology Key Project of Henan Province,China(No.242102321073)Doctoral Fund Project of Henan University of Technology,China(Nos.2020BS005,2023BS004).
文摘The high band gap of zinc oxide(ZnO)has significantly limited its potential application for organic contaminant removal in photocatalysis.In this study,ZnO/halloysites(HNTs)composites(ZnO/HNTs)were prepared using a high-temperature calcination method to enhance the removal of tetracycline hydrochloride(TCH).The experimental results demonstrated that the band gap of ZnO/HNTs decreased to 3.12 eV,compared to 3.21 eV for pure ZnO.The observed removal rate(k_(obs))of TCH in the ZnO/HNTs/vis system was 1.90×10^(-2) min^(-1),significantly higher than the rates in the HNTs/vis(1.25×10^(-3)min^(-1))and ZnO/vis(1.13×10^(-2) min^(-1))systems.Additionally,ZnO/HNTs exhibited strong resistance to coexisting natural organic and inorganic matter,maintaining high pollutant removal efficiency in natural water samples.The ZnO/HNTs/vis system also effectively removed other common organic pollutants,such as ciprofloxacin and methylene blue.Cycle tests indicated that the ZnO/HNTs/vis system retained 65.57%of its original efficiency,demonstrating good reusability and versatility.Scavenging and electron paramagnetic resonance experiments identified that h+was the primary species in the ZnO/HNTs/vis system,with other species playing auxiliary roles in TCH degradation.This study provides valuable insights into the design of novel ZnO-based photocatalysts for the degradation of organic pollutants in water.
基金Funded by the National Natural Science Foundation of China(51677045)the Natural Science Foundation of Heilongjiang Province of China(E201224)
文摘Two different morphologies of ZnO（lotus-shaped, rod-shaped） and ZnO/PVDF composite materials were prepared. The morphologies of ZnO and composite materials were characterized by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. Fourier transform infrared spectroscopy（FT-IR）, thermal gravimetry（TG）, and X-ray diffraction（XRD） were also used to characterize the chemical structures and phase composites of ZnO and ZnO/PVDF composite materials. Breakdown voltage, dielectric constant and dielectric loss of ZnO/PVDF composite materials were also tested. Microstructure analysis showed that ZnO nanoparticles dispersed uniformly in the matrix. And the dielectric constant expresses a significantly improvement while the dielectric loss and breakdown voltage expresses no significant change. Moreover, dielectric constant keeps an improvement tendency with increasing content of ZnO.
基金support from the China Natural Science Foundation(grant nos.21935003 and 22278392)Strategic Priority Research Program of the CAS(grant no.XDA21070100)+4 种基金Energy Revolution S&T Program of Yulin Branch,Dalian National Laboratory For Clean Energy,CAS(grant no.DNLYLEC202201)CAS Strategic Leading Science&Technology Program(A)(grant no.XDA21070000)Dalian High Level Talent Innovation Support Program(grant no.2020RD05)Youth Innovation Promotion Association,CAS(grant no.2022184)DICP funding(grant no.DICPI202136).
文摘Rechargeable aqueous zinc-based batteries(RAZBs)are rapidly developing as very promising energy storage devices for both grid-scale and portable applications,thanks to their inherent safety,cost effectiveness,environmental friendliness,and competitive energy density.Increasing efforts have been devoted to alleviating the formidable issues of nonuniform plating/stripping,corrosion,and hydrogen evolution related to zinc anode.Significant progress has been made in reversibility and cyclic stability of RAZBs.However,the problems have yet to be resolved well.In this review,strategies for zinc composition and structure optimization and anode–electrolyte interface construction are summarized.Perspectives for the further development of highperformance zinc anodes for RAZBs are outlined to guide future research and to accelerate their commercialization process.
