富铈Ce1-xLaxO2催化甲烷氧氯化性能

以硝酸铈、硝酸镧为前体,用氨水共沉淀法制备了一系列Ce_1-xLa_xO₂(x≤0.5)催化剂,利用XRD、N₂吸附-脱附、SEM、Raman、H₂-TPR和OSC对催化剂的物理化学性质进行了表征,并考察其在甲烷氧氯化反应中的催化性能。结果表明:Ce_1-xLa_xO₂催化剂的氧化还原性质随着镧含量的变化发生显著改变,并且这一性质的变化与反应的转化率及产物分布具有较强的联系。Ce_1-xLa_xO₂表面氧物种的活泼性对催化剂活性影响显著,而体相氧物种容易将生成的甲烷氯化物深度氧化。在Ce_1-xLa_xO₂(x<0.3)催化剂上表面氧物种起主导作用,氯甲烷为主要反应产物,Ce_0.8La_0.2O₂催化剂上氯甲烷选择性最高为52%。在体相氧物种更活泼的Ce_0.7La_0.3O₂和Ce_0.5La_0.5O₂上产物中CO的选择性显著上升,Ce_0.5La_0.5O₂催化剂上CO选择性高达48%。稳定性测试表明Ce_0.8La_0.2O₂催化剂具有良好的稳定性。     

The impact of Al2O3 back interface layer on low-temperature growth of ultrathin Cu(In,Ga)Se2 solar cells

With reducing the absorber layer thickness and processing temperature, the recombination at the back interface is severe, which both can result in the decrease of open-circuit voltage and fill factor. In this paper, we prepare Al2O3 by atomic layer deposition (ALD), and investigate the effect of its thickness on the performance of Cu(In,Ga)Se2 (CIGS) solar cell. The device recombination activation energy (EA) is increased from 1.04 eV to 1.11 eV when the thickness of Al2O3 is varied from 0 nm to 1 nm, and the height of back barrier is decreased from 48.54 meV to 38.05 meV. An efficiency of 11.57 % is achieved with 0.88-μm-thick CIGS absorber layer.     

气相法二氧化硅在胶衣树脂中的应用

通过气相法二氧化硅在胶衣树脂中的应用实验,重点研究影响不饱和树脂触变性和黏度的因素.同时测定树脂浇铸体的各项力学性能并讨论了影响该性能的因素.此外,将国产的气相法二氧化硅与国外的同类产品进行比较.