Author Affiliations
Abstract
1 School of Future Technology and Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng 475004, China
2 Zhenjiang Mars Photoenergy Technology Co., Ltd, Zhenjiang 212011, China
The TiO2 with nanoparticles (NPs), nanowires (NWs), nanorods (NRs) and nanotubes (NTs) structures were prepared by using a in-situ hydrothermal technique, and then proposed as a photoanode for flexible dye-sensitized solar cell (FDSSC). The influences of the morphology of TiO2 on the photovoltaic performances of FDSSCs were investigated. Under rear illumination of 100 mW·cm?2, the power conversion efficiencies of FDSSCs achieved 6.96%, 7.36%, 7.65%, and 7.83% with the TiO2 photoanodes of NPs, NWs, NRs, and NTs and PEDOT counter electrode. The FDSSCs based on TiO2 NRs and NTs photoanodes have higher short circuit current densities and power conversion efficiencies than that of the others. The enhanced power conversion efficiency is responsible for their nanotubes and rod-shaped ordered structures, which are more beneficial to transmission of electron and hole in semiconductor compared to the TiO2 nanoparticles and nanowires disordered structure.
dye-sensitized solar cells photoanode TiO2 morphology Journal of Semiconductors
2024, 45(2): 022801
Author Affiliations
Abstract
1 Georgi Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko, Chaussee Blvd., BG-1784 Sofia, Bulgaria
2 Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., 11 bd., BG-1113 Sofia, Bulgaria
3 Institute of Optical Materials and Technologies, “Acad. Jordan Malinowski”, Bulgarian Academy of Sciences, Acad. Georgi Bonchev Str., bl., 109, BG-1113 Sofia, Bulgaria
4 Dipartimento di Fisica, Università degli Studi della Calabria, Via P. Bucci, Cubo 33B, Rende (CS), IT-87036, Italy
We studied the effect of titanium dioxide (TiO2) nanoparticles (NPs) on dielectric behavior of Na ion-conducting salt-complexed polymer nanocomposite system formed from a binary polymer blend of poly(ethylene oxide) (PEO) and polyvinyl pyrrolidone (PVP), with the addition of both sodium metaperiodate (NaIO4) at concentration 10wt.% and TiO2 NPs of size ∼10nm, at concentrations 1, 2, 3, 4 and 5wt.%. Free standing nanocomposite PEO/PVP/NaIO4/TiO2 films (150m) were characterized at room-temperature by analyzing their complex electrical impedance and dielectric spectra in the range 1Hz–1MHz. At the concentration of 3wt.% of TiO2 NPs, both ion conductivity and dielectric permittivity of the PEO/PVP/NaIO4/TiO2 ion-conducting dielectrics reach an enhancement by more than one order of magnitude as compared to nanoadditive-free case.
Dielectric properties sodium-ion-polymer electrolyte systems titanium dioxide (TiO2) nanoparticles nanocomposites KWW model Journal of Advanced Dielectrics
2024, 14(1): 2350021
1 1.太原理工大学 1. 新材料界面科学与工程教育部重点实验室
2 2.材料科学与工程学院, 太原 030024
针对TiO2表面活性位点不足、反应动力学缓慢、CO2还原产物中碳氢化合物的产率低以及选择性差等问题, 研究通过Pd催化氧还原法在缺氧环境中构筑了具有表面氧空位的一维单晶TiO2纳米带阵列(Pd-Ov-TNB)。通过形貌结构、载流子行为及光催化性能分析, 探究了表面氧空位和Pd的氢溢流效应对光生载流子分离传输及还原产物选择性的影响。结果表明, Pd-Ov-TNB的CO2还原活性强, 产物中CH4、C2H6和C2H4的产率分别为40.8、32.09和3.09 µmol·g-1·h-1, 碳氢化合物的选择性高达84.52%, 在C-C偶联方面展现出巨大的潜力。其一维单晶纳米带结构提高了材料的活性比表面积和结晶度, 为CO2还原反应提供了更多的活性位点, 并加速载流子的分离传输。同时, 氧空位增强了光生电荷的表面积累, 为CO2还原提供了富电子环境。此外, Pd纳米颗粒提高反应体系中H*的浓度, 并通过氢溢流效应将H*转移到催化剂表面吸附CO2的活性位点, 促进反应中间产物氢化。各种优势共同作用促使CO2向碳氢化合物高效转化。
氧空位 TiO2纳米带 氢溢流 光催化还原CO2 oxygen vacancies TiO2 nanobelt hydrogen spillover photocatalytic CO2 reduction
1 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, China
2 Key Laboratory for Optoelectronics and Communication of Jiangxi Province, Jiangxi Science and Technology Normal University, Nanchang 330013, China
3 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 110623, China
4 University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100049, China
Frontiers of Optoelectronics
2020, 13(4): 409
1 Department of Fundamental Course Teaching, Anhui Technical College of Industry and Economy, Hefei 230051, China
2 College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, China
Frontiers of Optoelectronics
2017, 10(4): 395
1 State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
2 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
This paper proposed a new architecture design for nanowire-based quantum-dot-sensitized solar cells to improve the photovoltaic performance. Microstructured rough substrate was used to increase the surface area of the photoanode without influence on charge carrier transport in the system. Compared to conventional devices, the short circuit current density and power conversion efficiency were enhanced by 50%. And the technology can be widely used in the photoelectrochemical (PEC) field, and it can be combined with other hierarchical nanostructures.
quantum-dot-sensitized solar cell (QDSSC) quantum-dot-sensitized solar cell (QDSSC) hierarchical structure hierarchical structure TiO2 nanowires TiO2 nanowires Frontiers of Optoelectronics
2016, 9(1): 53
大连理工大学物理与光电工程学院,大连 116024
表面增强拉曼光谱(SERSp)技术是一种新兴的分析检测技术,由于其对样品分析灵敏度高、检测时间短以及样品所需量小等优点,近年来该技术已在生物医学,化学等领域得到广泛的应用,同时表面增强拉曼散射(SERS)基底的制备已成为该领域的研究热点。本文主要对三种以银纳米粒子(AgNPs)的SERS效应为基质的拉曼活性基底:毛细管-AgNPs,二氧化钛-AgNPs和滤纸-AgNPs进行比较研究。首先分别用三种基底对罗丹明6G(R6G)分子进行拉曼光谱采集及分析,找出三种SERS基底相应的最佳制备条件。最后用这三种最佳条件下制备的SERS基底对同一个健康人血清进行拉曼光谱检测,并对结果进行分析比较。初步结果:三种SERS基底都是可靠的和实用的;二氧化钛-AgNPs基底灵敏度相对较高,但制备过程较复杂;滤纸-AgNPs基底灵敏度其次;毛细管-AgNPs基底及滤纸-AgNPs基底的制备均较为简单。因此,从实用角度考虑,滤纸-AgNPs基底比较适合血清的表面增强拉曼光谱检测与分析。
表面增强拉曼散射 毛细管 二氧化钛 滤纸 银纳米粒子 血清 SERS capillary TiO2 filter paper AgNPs serum
1 广东省高等学校量子信息技术重点实验室，华南师范大学物理与电信工程学院，广东 广州 510006
2 广东工业大学物理与光电工程学院，广东 广州 510006
为研究TiO2和CdTe量子点间荧光共振能量转移效率对PDT体外灭活HL60细胞的影响，本文以发射波长为407.8 nm的TiO2为供体，CdTe为受体，通过TiO2与CdTe超声混合构建荧光共振能量转移体系，研究了TiO2和CdTe量子点间荧光共振能量转移；其中体系中TiO2浓度为200 μg/mL时，通过逐渐增加体系中CdTe浓度来观察供体TiO2荧光强度变化，根据Forster能量共振转移理论计算体系能量转移效率。之后将体系用于PDT体外灭活HL60细胞的实验研究，采用CCK- 8 法，结合酶联免疫检测仪进行细胞活性检测，得出不同浓度下体系的PDT灭活效率。发现当TiO2-CdTe体系荧光共振能量转移效率20.21%时，PDT灭活效率为53.75%，而当体系能量转移效率为6.77%时，灭活效率达到了71.54%，实验表明在一定浓度范围内，TiO2-CdTe混合体系荧光共振能量转移效率低时，PDT灭活效率更高。这可能是由于TiO2-CdTe之间能量共振转移低时，容易致使TiO2表面光生电子和空穴复合率降低，提高了二氧化钛的光催化活性，导致灭活效率增高。
共振能量转移 光动力疗法（PDT） 白血病HL60细胞 TiO2-CdTe TiO2-CdTe resonance energy transfer photodynamic therapy(PDT) leukemic HL60 cell
大连工业大学 新能源材料研究所, 辽宁 大连116034
用溶胶-水热法制备了Sm3+掺杂的TiO2粉体(TiO2∶Sm3+),将其按不同质量分数掺杂到P25基体中,制备了具有下转换功能的光阳极,并将其用于染料敏化太阳能电池中,提高了电池的光电性能。荧光光谱显示,TiO2∶Sm3+粉体可以将紫外光转换为570~700 nm的可见光。当下转换光阳极中TiO2∶Sm3+粉体的掺杂质量分数为80%时,短路电流密度达到13.12 mA/cm2,与纯P25光阳极相比,提高了26.5%,转换效率也提高了23.5%。
染料敏化太阳能电池 溶胶-水热法 下转换光阳极 短路电流 dye-sensitized solar cells sol-hydrothermal method TiO2∶Sm3+ TiO2∶Sm3+ down-conversion photoanode short circuit currents
内蒙古师范大学化学与环境科学学院 功能材料物理与化学自治区重点实验室， 内蒙古 呼和浩特010022
采用溶胶-凝胶法在室温下制备了以BaO-TiO2-3SiO2为基质的稀土Eu3+掺杂的发光材料，各材料的量比为 n(Ba)∶n(Ti)∶n(Si)∶n(Eu)=1∶1∶3∶x。 通过DTA-TG、IR、XRD、激发和发射光谱对材料的结构和发光性能进行了分析。DTA-TG测试表明，样品在50~400 ℃之间出现明显失重现象，说明在此过程中凝胶中的吸附水、乙醇、醋酸等物质发生了脱附释放。IR光谱显示，制备的样品中主要存在Ti—O—Si和O—Si—O键。XRD测试证明，材料属于非晶态。激发和发射光谱图显示，材料制备的最佳退火温度为800 ℃，Eu3+的最佳掺杂比例为x(Eu)=5.75×10-3。在612 nm监测波长下，测得的最佳激发波长为紫外光395 nm 和可见光465 nm，即在395 nm和465 nm光激发下，材料发射的红光单色性好且强度基本相同。
溶胶-凝胶法 发光材料 Sol-gel method BaO-TiO2-3SiO2∶Eu3+ BaO-TiO2-3SiO2∶Eu3+ luminescent materials
