Undoped and praseodymium-doped zinc oxide （Pr-doped ZnO） （with 2.0-mol%-6.0-mol% Pr） nanoparticles as sunlight-driven photocatalysts are synthesized by means of co-precipitation with nitrates followed by thermal a...Undoped and praseodymium-doped zinc oxide （Pr-doped ZnO） （with 2.0-mol%-6.0-mol% Pr） nanoparticles as sunlight-driven photocatalysts are synthesized by means of co-precipitation with nitrates followed by thermal annealing. The structure, morphology, and chemical bonding of the photocatalysts are studied by x-ray diffraction （XRD）, scanning electron microscopy （SEM） with energy dispersive x-ray emission spectroscopy （EDS）, x-ray photoelectron spectroscopy （XPS）, and Fourier transform infrared spectroscopy （FTIR）, respectively. The optical properties are studied by photolu- minescence （PL） and UV-vis diffuse reflectance spectroscopy （UV-vis DRS）. We find that Pr doping does not change the crystallinity of ZnO; but it reduces the bandgap slightly, and restrains the recombination of the photogenerated electron-hole pairs. The photocatalytic performance of the photocatalysts is investigated by the photodegradation reaction of 10-mg/L rhodamine B （RhB） solution under simulated sunlight irradiation, showing a degradation rate of 93.75% in ZnO doped with 6.0-mo1% Pr.展开更多
We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4 I5 prepared by pulsed laser deposition. The RbAg4 I5 target for PLD process was mechano-chemically synthesized by high-energy ball ...We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4 I5 prepared by pulsed laser deposition. The RbAg4 I5 target for PLD process was mechano-chemically synthesized by high-energy ball milling in Ar atmosphere using β-AgI and RbI as raw materials. The ion-conducting properties of RbAg4 I5 were studied by alternating current(AC) impedance spectroscopy and the ionic conductivity at room temperature was estimated 0.21 S/m. The structure, morphology, and elemental composition of the RbAg4 I5 film were investigated. The Ag+ ion-conducting property of the prepared superioni-conductor film was exploited for ion–beam generation. The temperature and accelerating voltage dependences of the ion current were studied. Few nA current was obtained at the temperature of 196?C and the accelerating voltage of 10 kV.展开更多
基金Project supported by the International Cooperation Program of the Ministry of Science and Technology of China(Grant No.2015DFR00720)the Cooperation Program of Wuhan Science and Technology Bureau,China(Grant No.2016030409020219)the Shenzhen Committee on Science and Technology Innovation,China(Grant No.JCYJ20170818112901473)
文摘Undoped and praseodymium-doped zinc oxide （Pr-doped ZnO） （with 2.0-mol%-6.0-mol% Pr） nanoparticles as sunlight-driven photocatalysts are synthesized by means of co-precipitation with nitrates followed by thermal annealing. The structure, morphology, and chemical bonding of the photocatalysts are studied by x-ray diffraction （XRD）, scanning electron microscopy （SEM） with energy dispersive x-ray emission spectroscopy （EDS）, x-ray photoelectron spectroscopy （XPS）, and Fourier transform infrared spectroscopy （FTIR）, respectively. The optical properties are studied by photolu- minescence （PL） and UV-vis diffuse reflectance spectroscopy （UV-vis DRS）. We find that Pr doping does not change the crystallinity of ZnO; but it reduces the bandgap slightly, and restrains the recombination of the photogenerated electron-hole pairs. The photocatalytic performance of the photocatalysts is investigated by the photodegradation reaction of 10-mg/L rhodamine B （RhB） solution under simulated sunlight irradiation, showing a degradation rate of 93.75% in ZnO doped with 6.0-mo1% Pr.
基金Project supported by the National Natural Science Foundation of China(Grant No.11875210)China Postdoctoral Science Foundation(Grant No.2018M640724)+1 种基金the International Cooperation Program of Guangdong Provincial Science and Technology Plan Project(Grant No.2018A050506082)the Talent Project of Lingnan Normal University,China(Grant No.ZL1931)
文摘We fabricated a silver ion emitter based on the solid state electrolyte film of RbAg4 I5 prepared by pulsed laser deposition. The RbAg4 I5 target for PLD process was mechano-chemically synthesized by high-energy ball milling in Ar atmosphere using β-AgI and RbI as raw materials. The ion-conducting properties of RbAg4 I5 were studied by alternating current(AC) impedance spectroscopy and the ionic conductivity at room temperature was estimated 0.21 S/m. The structure, morphology, and elemental composition of the RbAg4 I5 film were investigated. The Ag+ ion-conducting property of the prepared superioni-conductor film was exploited for ion–beam generation. The temperature and accelerating voltage dependences of the ion current were studied. Few nA current was obtained at the temperature of 196?C and the accelerating voltage of 10 kV.
