Solvothermal synthesis of Bi2O3/BiVO4 heterojunction with enhanced visible-light photocatalytic performances

Novel, three-dimensional, flower-like Bi2O3/BiVO4 heterojunction photocatalysts have been prepared by the combination of homogeneous precipitation and two-step solvothermal method followed by thermal solution of NaOH etching process. The as-obtained samples were fully characterized by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, Brunauer-Emmett-Teller surface area, and UV-vis diffusereflectance spectroscopy in detail. The crystallinity, microstructure, specific surface area, optical property and photocatalytic activity of samples greatly changed depending on solvothermal reaction time. The photocatalytic activities of samples were evaluated on the degradation of methyl orange (MO) under visible-light irradiation. The Bi2O3/BiVO4 exhibited much higher photocatalytic activities than pure BiVO4 and conventional TiO2 (P25). The result revealed that the three-dimensional heterojunction played a critical role in the separation of the electron and hole pairs and enhancement of the interfacial charge transfer efficiency, which was responsible for the enhanced photocatalytic activity.     

Microwave-assisted synthesis of Mo-doped Hl_xSr2Nba_xMOxOlo （x = O, 0.05, 0.1, 0.15 and 0.2） with high photocatalytic activity

Hl-xSr2Nb3-xMox01o photocatalysts were synthesized using a microwave-irradiation-assisted ion- exchange reaction. The physicochemical properties of the photocatalysts were analyzed by field-emission scan- ning electron microscopy （FE-SEM）, X-ray diffraction （XRD） and ultraviolet-visible spectroscopy （UV-vis）. The photocatalytic activity of the Hl-xSr2Nb3-xMox01o was evaluated by degrading methyl orange （MO） dye under light irradiation from a 40-W mercury lamp. The results proved that the Mo doping amount had an important effect on the photocatalytic activity of the catalysts. The highest photoeatalytic activity was obtained when the doping amount was 15 mol%. Furthermore, the complex preparation process and lengthy time was simplified and shortened greatly.     

Bi_2WO_6-SrTiO_3异质结的制备及可见光催化性能研究

采用两步水热法制备出不同比例Bi_2WO_6-SrTiO_3异质结,对其进行XRD、SEM、BET、紫外可见漫反射(DRS)等表征测试。并在室温下以氙灯为光源,对不同比例Bi_2WO_6-SrTiO_3异质结进行吸附与光降解测试。结果表明20 mg/L甲基橙2 h内降解率最高可达95%,且对甲基蓝、刚果红均有降解效果。Bi_2WO_6与SrTiO_3形成了异质结结构有效的抑制了光生载流子与空穴的复合,增强了界面电荷传输效率,使光催化效率得到了提高。     

NiS插层复合HCa2Nb3O10的制备及光催化性能的研究

本文通过高温固相反应制备出KCa2Nb3O10,所制备的样品通过质子交换制备出HCa2Nb3O10,用C6H13NH2对样品进行柱撑制备出HCa2Nb3O10/n-C6H13NH2,然后将Ni2+插入HCa2Nb3O10层间区域,最后通过硫化反应制备出插层复合材料HCa2Nb3O10/NiS。在40W紫外灯照射下,研究了各光催化剂分别降解甲基橙和亚甲基蓝溶液的光催化活性,实验结果表明复合后的催化剂HCa2Nb3O10/NiS光催化分解甲基橙和亚甲基蓝的活性均高于未复合的催化剂单体。     

染料敏化纳米晶TiO2太阳能电池研究进展

介绍了染料敏化纳米晶TiO2太阳能电池的结构及其原理，对影响其光电转换效率的关键因素如纳米TiO2膜、敏化染料、电解质做了介绍。对各组成部分的研究现状做了综述，探讨了研究的主要方向，并对各项研究的意义及基本原理作了评述，对今年DYSC所面临的问题以及工业化的前景做了展望。此外论述了现代分析技术对DYSC电池研究的重要意义。对于DYSC的研究，染料是最重要的方面,TiO2膜的进一步优化对DYSC电池的整体性能的提高有重要的意义；固体电解质的使用是必然的趋势，是工业化的前提。     

染料敏化太阳电池中电子传输性能

通过检测染料敏化TiO2纳米晶太阳电池中TiO2膜厚度和入射光的强度对电池光电转换性能的影响来研究电池中电子的传输性能。结果表明：TiO2膜厚度和入射光强度对电池性能有很大的影响。当TiO2膜厚度增大时，电池的短路电流(Isc)加大，而填充因子(ff)下降，开路电压(Voc)先上升后下降，电池的单色光光电转化效率(IPCE)增大；当光强度加大时，电池的短路电流和开路电压均增加，但是电池的填充因子降低。并用UV-Vis等手段表征了染料RuL2(SCN)2。     

染料敏化太阳能电池的二氧化钛膜性能研究

以二氧化钛(Ti02)纳米粉(P25)为原料，把它研磨成胶状，用涂敷法制得TiO2纳米多孔膜，并组装成太阳能电池，用100W氙灯作为模拟太阳光，对电池进行光电性能测试．根据电池的短路电流(Isc)、开路电压(Voc)和填充因子(ff)等指标来反映电池的性能．研究表明，分散剂乙酰丙酮、OP乳化剂、研磨时间和热处理后的保温时间长短对TiO2膜的性能均有很大的影响．其结果是，乙酰丙酮0．15mL、OP乳化剂0．10mL、研磨时间1h和保温时间0．5h时，TiO2膜的光电性能较好，JIsc,Voc和ff分别为8．85mA、567mV和0．445．并用XRD和比表面及孔隙分析仪对TiQ2膜进行了表征．     

回归式反光材料研究现状分析

本文介绍了回归式反光材料的光学原理,分析了回归式反光材料的国内外研究现状。对国内回归式反光材料的进一步研究方向作了探讨。     

高效染料纳晶太阳能电池

本文介绍了高效染料纳米晶体太阳能电池的发展、结构和工作原理 ,并在此基础上提出一些今后需要解决的问题。     

铬和钼掺杂对HCa2Nb3O10／Pt光催化性能的影响

通过高温固相反应合成了铌酸盐KCa2Nb3O10及Cr^3＋和Mo^6＋掺杂（摩尔分数5％）的KCa2Nh3O10，并通过离子交换反应制备出HCa2Nb3O10及Cr^3＋和Mo^6＋掺杂的HCa2Nb3O10采用X射线衍射、原子吸收光谱、扫描电镜等对所制得的样品进行了表征．在甲醇为电子给体、Pt为助催化剂的情况下，研究了催化剂HCa2Nb3O10及Cr^3＋和Mo^6＋掺杂的HCa2Nb3O10在紫外光辐射下分解水产氢的光催化活性，并讨论了引起催化剂活性差异的原因，