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您的检索式：作者名="Wu Qinfang"
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| 1 | Ag-Pd alloy decorated ZnIn_(2)S_(4) microspheres with optimal Schottky barrier height for boosting visible-light-driven hydrogen evolution显示文摘Rapid charge carrier recombination rate and insufficient light harvesting capacity are two dominat-ing drawbacks encountered in zinc indium sulfide(ZnIn_(2)S_(4))for photocatalytic applications.Herein,a chemical reduction method was performed to combine bimetallic Ag-Pd alloy nanoparticles(NPs)with spherical-like ZnIn_(2)S_(4)(ZIS).By optimizing Ag:Pd molar ratio and overall loading amount,the optimal Ag_(0.25)Pd_(0.75)-ZIS sample exhibited a maximum H_(2)evolution rate(125.4μmol/h)under visible light,which was higher than that of ZIS,Ag-ZIS and Pd-ZIS.The loading of Ag NPs contribution to PHE reaction by its plasmonic effect was negligible compared to that of Pd loading(Schottky effect).The apparent quan-tum yield(AQY)values over Ag_(0.25)Pd_(0.75)-ZIS sample could reach up to 18.3%at 400 nm and 15.8%at 420 nm.The enhanced activity for photocatalytic hydrogen evolution(PHE)over Ag_(0.25)Pd_(0.75)-ZIS sample was mainly due to the bimetallic synergistic effect that presented as follows.Firstly,the plasmon hy-bridization by loading Ag-Pd bimetallic alloy can significantly increase light harvesting capacity of ZIS.Secondly,the optimal Schottky barrier height formed between Ag-Pd alloy and ZIS interface was benefi-cial for prolonging electron-hole pair lifetimes,promoting charge carrier separation and thus facilitating PHE efficiency.Density functional theory(DFT)analysis indicated that the adsorption energy of H∗over Pd_(0.75)Ag_(0.25)alloy was very close to zero and thus theoretically possessed the highest activity for H_(2)evo-lution,which is in line with experimental results.Combined theoretical calculation with experimental results,a reasonable photocatalytic mechanism was proposed and verified. | Chao Liu Yulong Zhang Jiaxin Wu Hailu Dai Chengjian Ma Qinfang Zhang Zhigang Zou | 2022 | Journal of Materials Science & Technology2022，，19： | 1 |
| 2 | Efects of diferent casting mould cooling rates on microstructure and properties of sand-cast Al-7.5Si-4Cu alloy显示文摘In this work, Al-7.5Si-4Cu alloy melt modified by Al-10Sr, RE and Al-5Ti-B master alloys was poured into multi-step moulds made from three moulding sands, including quartz, alumina and chromite, to investigate comparatively the effects of different cooling rates of the casting mould on the alloy's microstructures and mechanical properties. The results show that with an increase in wall thickness, the cooling rate decreases, the dendrite arm spacing(DAS) increases significantly and the mechanical properties decrease steadily. The elongation is more sensitive to the cooling rate than the tensile strength. No obvious trend of the effect of wall thickness on hardness of the alloy was found. When the cooling rate is at its greatest, the microstructures and mechanical properties are the best when using chromite sand. The improvement of the properties is mainly attributed to the decrease of the DAS, the grain refinement and the metamorphic effect. Each of the three has a strong impact on the microstructures. Furthermore, a series of fitting models was established based on the data of the DAS to predict the mechanical properties of the multivariate sand-cast Al-7.5Si-4Cu alloy, | Liu Guanglei Si Naichao Sun Shaochun Wu Qinfang | 2013 | China Foundry2013，10，6： | 1 |
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