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学者姓名：桑丽霞
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摘要 ：
Hierarchical Ag/SiO2/TiO2 nanobowl (NB) arrays were fabricated for use as plasmonic photoanodes for solar-hydrogen conversion. The nanobowls had large pore size and were composed of an upper TiO2 nanoring and a lower TiO2 nanohole. A thin SiO2 inter-layer was introduced as an electron transmission channel to change the mechanism of hot electron transport. Simulations were performed to characterize the variation of electron concentration in Ag/SiO2/TiO2 NB arrays, taking into account both the optical transition of photogenerated electrons, and electron tunneling. The multiphysics coupling function of COMSOL software provided the light source for optical transition of photogenerated electrons, and a Wentzel-Kramers-Brillouin model was employed to represent the tunneling. The results demonstrate that the TiO2 nanoring was a transporter, which transmitted electrons downward to the nanohole. The SiO2 layer replaces the Schottky barrier to become a bridge for tunneling of hot electrons in high- and low-energy states into TiO2. Moreover, the coverage of the SiO2 layer helped increase the light absorption of TiO2, it also reduced the near electric field coupling between Ag and TiO2. Accordingly, under AM 1.5 light irradiation, the photocurrent density and average hydrogen evolution rate of Ag/SiO2/TiO2 were 1.8 and 2.2 times higher, respectively, than those of pure TiO2, implying far more efficient migration of carriers.
关键词 ：
hot electron hot electron nanobowl nanobowl SiO2 layer SiO2 layer tunneling tunneling Wentzel-Kramers-Brillouin (WKB) approximation Wentzel-Kramers-Brillouin (WKB) approximation
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| GB/T 7714 | Yu, Zexin , Sang, Lixia , Cao, Angran et al. Oriented electron tunneling transport in hierarchical Ag/SiO2/TiO2 nanobowl arrays for plasmonic solar water splitting [J]. | NANO RESEARCH , 2021 . |
| MLA | Yu, Zexin et al. "Oriented electron tunneling transport in hierarchical Ag/SiO2/TiO2 nanobowl arrays for plasmonic solar water splitting" . | NANO RESEARCH (2021) . |
| APA | Yu, Zexin , Sang, Lixia , Cao, Angran , Gao, Yunlong . Oriented electron tunneling transport in hierarchical Ag/SiO2/TiO2 nanobowl arrays for plasmonic solar water splitting . | NANO RESEARCH , 2021 . |
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摘要 ：
Bimetallic nanostructures have been endowed with the function of enhancing photon absorption and charge separation for photo-hydrogen conversion. Bimetallic CuAg/TiO2 nanotube arrays (TNTAs) were synthesized with the different ratios of precursors Cu2+ and Ag+ (1 : 3, 1 : 1, and 3 : 1) and their local electric field distribution was characterized by means of COMSOL software. The results demonstrate that the increase of the amount of Cu particles has an active effect on the inhibition of the hot spot effect between Ag particles. In addition, the current flow between Ag and Cu verified the "double take" of Cu particles. They receive hot electrons transferred from Ag, and also provide injected hot electrons for TiO2. Based on X-ray photoelectron spectroscopy, the binding energy shifts in a CuAg bimetal with different metal ratios, indicating the electron transfer behavior from Ag to Cu. When an optimal proportion of the CuAg bimetal is 3 : 1, the photocurrent density and average hydrogen evolution rate of CuAg/TNTAs were 1.78 and 1.69 times higher, respectively, than those of pure TNTAs, implying far more efficient migration of hot electrons.
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| GB/T 7714 | Yu, Zexin , Gao, Yunlong , Sang, Lixia et al. Probing into the double identity of Cu in bimetallic CuAg-TNTA hot-electron devices for photo-hydrogen conversion [J]. | CATALYSIS SCIENCE & TECHNOLOGY , 2021 , 11 (19) : 6529-6536 . |
| MLA | Yu, Zexin et al. "Probing into the double identity of Cu in bimetallic CuAg-TNTA hot-electron devices for photo-hydrogen conversion" . | CATALYSIS SCIENCE & TECHNOLOGY 11 . 19 (2021) : 6529-6536 . |
| APA | Yu, Zexin , Gao, Yunlong , Sang, Lixia , Lei, Lei . Probing into the double identity of Cu in bimetallic CuAg-TNTA hot-electron devices for photo-hydrogen conversion . | CATALYSIS SCIENCE & TECHNOLOGY , 2021 , 11 (19) , 6529-6536 . |
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摘要 ：
超临界二氧化碳(S-CO_2)太阳能热发电技术需要集热蓄热介质的工作温度能够达到1 000℃以上,以有效提升太阳能热发电效率和降低太阳能热发电成本。固体颗粒可作为集热蓄热工作介质应用于高温环境,其性质和筛选研究对于发展S-CO_2太阳能热发电技术至关重要。本文综述了近年来应用于太阳能热发电领域的各种集热蓄热颗粒及其性能研究,包括颗粒的光学性能、热物理性能、热稳定性和抗磨损性,进而总结和展望了集热蓄热颗粒的研究重点,指出目前缺乏对固体颗粒性能的全面分析研究,对颗粒表面改性以及通过添加颜料来制备高吸收率的粒子是新的研究热点,国内对于颗粒比热容的研究温度较低(800℃以下),需进一步加强颗粒比热容和...
关键词 ：
光学性质 光学性质 太阳能热发电 太阳能热发电 超临界二氧化碳 超临界二氧化碳 热物理性能 热物理性能 固体颗粒 固体颗粒
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| GB/T 7714 | 刘建峰 , 桑丽霞 , 王凯音 et al. 超临界二氧化碳太阳能热发电系统中集热蓄热颗粒及其性质研究现状 [J]. | 热力发电 , 2020 , 49 (10) : 38-47 . |
| MLA | 刘建峰 et al. "超临界二氧化碳太阳能热发电系统中集热蓄热颗粒及其性质研究现状" . | 热力发电 49 . 10 (2020) : 38-47 . |
| APA | 刘建峰 , 桑丽霞 , 王凯音 , 张冉 , 吴玉庭 . 超临界二氧化碳太阳能热发电系统中集热蓄热颗粒及其性质研究现状 . | 热力发电 , 2020 , 49 (10) , 38-47 . |
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摘要 ：
本实用新型公开了一种用于激光闪射法测量颗粒热扩散系数的坩埚，包括上端开口带帽边的坩埚体，直径与坩埚体帽边相同的圆环垫片，施压环，施压环上部设置有盖檐，宽度与坩埚体帽边相同，施压环下部有一圆形盖片。本实用新型的坩埚，可精确控制或改变坩埚内颗粒样品的厚度，避免了试样厚度的粗略测量，从而提高测试精度。
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| GB/T 7714 | 桑丽霞 , 张冉 . 用于激光闪射法测量颗粒热扩散系数的坩埚 : CN202020541145.3[P]. | 2020-04-14 . |
| MLA | 桑丽霞 et al. "用于激光闪射法测量颗粒热扩散系数的坩埚" : CN202020541145.3. | 2020-04-14 . |
| APA | 桑丽霞 , 张冉 . 用于激光闪射法测量颗粒热扩散系数的坩埚 : CN202020541145.3. | 2020-04-14 . |
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摘要 ：
In order to simplify the complex process of preparing TiO2 nano bowl array by traditional method, the basic principle of two-step anodizing method was adopted. Namely, during the first and second anodizing process, oxidation voltage and electrolyte concentration all keep as before, but varying the anodizing time. The first anodizing time is 1 hour, and the second anodizing time changes from 0 s to 140 s. After the first anodizing, as the initial oxide layer for the second anodization, the residual bowl like pits on the surface of Ti-sheet may undergo three stages of growth. Firstly, the TiO2 barrier began to grow longitudinally at the bottom of the pit. Then the dissolution of the electrolyte at the edge of the bowl took effect, and nano pores appeared in the bowl. Secondly, the longitudinal growth rate of the barrier layer and the dissolution rate of the electrolyte reached a relative balance. The bottom center of the TiO2 barrier layer was first corroded, then the corrosion position changed around the bowl edge, and other nanopores were corroded laterally. Thirdly, the relationship between the longitudinal corrosion rate and the transverse corrosion rate was constantly changing, which showed that the depth of the nanopore in the bowl increased all the time, but the diameter of the bowl and the pore first increased and then decreased. Under the condition of the growth rate of TiO2 barrier layer was in relative equilibrium with the chemical dissolution rate of electrolyte, and the longitudinal corrosion rate was relatively consistent with the transverse corrosion rate, TiO2 nano bowl array with large pore diameter was synthesized. The optimal second anodizing time was 110 s, and the diameter of bowl was 133 nm. © All right reserved.
关键词 ：
Corrosion rate Corrosion rate Dissolution Dissolution Electrolytes Electrolytes Growth rate Growth rate Nanopores Nanopores Oxide minerals Oxide minerals Titanium dioxide Titanium dioxide
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| GB/T 7714 | Yu, Zexin , Sang, Lixia . Preparation and Formation Mechanism of a Novel TiO2 Nano Bowl Array with Large Hole Diameter [J]. | Chinese Journal of Materials Research , 2020 , 34 (7) : 489-494 . |
| MLA | Yu, Zexin et al. "Preparation and Formation Mechanism of a Novel TiO2 Nano Bowl Array with Large Hole Diameter" . | Chinese Journal of Materials Research 34 . 7 (2020) : 489-494 . |
| APA | Yu, Zexin , Sang, Lixia . Preparation and Formation Mechanism of a Novel TiO2 Nano Bowl Array with Large Hole Diameter . | Chinese Journal of Materials Research , 2020 , 34 (7) , 489-494 . |
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摘要 ：
用两步阳极氧化法简便快捷地制备出低成本TiO_2纳米碗阵列。固定阳极氧化电压、实验温度和电解液浓度等因素、改变第二次阳极氧化时间并结合扫描电镜等测试手段考察阵列碗状结构的形成过程,从阵列的形成机制研究了TiO_2纳米碗内TiO_2阻挡层的纵向生长、电解液的溶解、纵向腐蚀及横向扩展之间关系的变化。结果表明,当纵向生长与纵向溶解、纵向腐蚀与横向扩展达到平衡时,TiO_2碗内纳米孔消失,孔径与碗口直径相同。当第二次阳极氧化时间为110 s时,合成出133 nm的TiO_2纳米碗状阵列。
关键词 ：
TiO_2纳米孔 TiO_2纳米孔 TiO_2纳米碗 TiO_2纳米碗 TiO_2阻挡层 TiO_2阻挡层 两步阳极氧化法 两步阳极氧化法 材料表面与界面 材料表面与界面 腐蚀 腐蚀
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| GB/T 7714 | 于泽鑫 , 桑丽霞 . 新型大孔径TiO_2纳米碗状阵列的制备及其机制 [J]. | 材料研究学报 , 2020 , 34 (07) : 489-494 . |
| MLA | 于泽鑫 et al. "新型大孔径TiO_2纳米碗状阵列的制备及其机制" . | 材料研究学报 34 . 07 (2020) : 489-494 . |
| APA | 于泽鑫 , 桑丽霞 . 新型大孔径TiO_2纳米碗状阵列的制备及其机制 . | 材料研究学报 , 2020 , 34 (07) , 489-494 . |
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摘要 ：
利用经典分子动力学对锐钛矿型TiO_2(101)/(001)羟基化表面与水分子的相互作用进行模拟计算,分析得到表面羟基对TiO_2-H_2O界面性质的影响.首先,通过TiO_2表面钛、氧原子与水中氧、氢原子间的径向分布函数及键长验证得到,所建羟基化TiO_2(101)/(001)模型和力场能够很好地模拟TiO_2-水体系的结构和相关特性.由分子动力学快照图可知,TiO_2表面的O_(2c)吸附位在羟基化前后不发生改变,而完整表面原有的Ti_(5c)吸附位被表面羟基中的氢原子取代.羟基化表面的水分子以氢键作用吸附于TiO_2表面引起界面电荷转移,根据水分子密度分布可知TiO_2-H_2O界面形成...
关键词 ：
吸附 吸附 扩散 扩散 水 水 界面性质 界面性质 羟基化表面 羟基化表面 锐钛矿型TiO_2 锐钛矿型TiO_2
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| GB/T 7714 | 桑丽霞 , 雷蕾 , 陈平方 et al. 锐钛矿型TiO_2羟基化表面与H_2O相互作用的分子动力学研究 [J]. | 北京工业大学学报 , 2020 , 46 (02) : 180-190 . |
| MLA | 桑丽霞 et al. "锐钛矿型TiO_2羟基化表面与H_2O相互作用的分子动力学研究" . | 北京工业大学学报 46 . 02 (2020) : 180-190 . |
| APA | 桑丽霞 , 雷蕾 , 陈平方 , 王军 . 锐钛矿型TiO_2羟基化表面与H_2O相互作用的分子动力学研究 . | 北京工业大学学报 , 2020 , 46 (02) , 180-190 . |
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摘要 ：
In this study, series of KCl-LiCl /expanded graphite (EG) composite phase change materials (CPCM) with dif-ferent EG contents for high temperature thermal energy utilization were prepared by melting impregnation method. The mixture of KCl-LiCl was served as the phase change material (PCM) for thermal energy storage, while EG was acted as not only the matrix to prevent the leakage of PCM but also the heat transfer promoter to improve the thermal conductivity of PCM. The microstructures, phase transition properties, thermal conductivity and thermal stability of different samples were evaluated, and the results showed that KCl-LiCl was wrapped in the network structure of EG without agglomeration. The experimental latent heat of CPCMs were close to the theoretical value and there was no remarkable variation in melting point. The highest thermal conductivity of CPCMs was 12.05 W/(m center dot K), which is 41.6 times higher than that of KCl-LiCl. Moreover, the CPCMs whose EG content higher than 20 wt% showed good thermal stability after 100 thermal shock cycles. Furthermore, when 10 wt% SiC particles were added into 80KCl-LiCl/20EG, the compressive strength of 80KCl-LiCl/20EG/10SiC was enhanced to 9 MPa, which is 1.8 times higher than that of 80KCl-LiCl/20EG.
关键词 ：
Composite phase change material Composite phase change material Compressive strength Compressive strength Expanded graphite Expanded graphite Molten salt Molten salt Thermal property Thermal property
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| GB/T 7714 | Sang, Lixia , Xu, Yongwang . Form stable binary chlorides/expanded graphite composite material with enhanced compressive strength for high temperature thermal storage [J]. | JOURNAL OF ENERGY STORAGE , 2020 , 31 . |
| MLA | Sang, Lixia et al. "Form stable binary chlorides/expanded graphite composite material with enhanced compressive strength for high temperature thermal storage" . | JOURNAL OF ENERGY STORAGE 31 (2020) . |
| APA | Sang, Lixia , Xu, Yongwang . Form stable binary chlorides/expanded graphite composite material with enhanced compressive strength for high temperature thermal storage . | JOURNAL OF ENERGY STORAGE , 2020 , 31 . |
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摘要 ：
The wrapping of plasmonic metal particles with silica shell is considered to be one of the effective means to make full use of hot electrons for solar-hydrogen conversion. Ag@SiO2-TiO2 structures with different shell thicknesses (2, 3, 5, 7 and 11 nm) as hot-electron devices were fabricated, and their local electric field was simulated by the COMSOL software. A novel method was proposed to visually characterize the migration of hot electrons, which was represented by multiphysics coupling. The simulated current flow indicates the transfer direction of hot electrons, and the variation of electron-hole concentration implies the gain and loss of electrons. The results demonstrate that the applied thinner silica shell not only decreases the barrier to the hot electron transport out of shell, but also intensify local electric field. When the silica shell thickness is 2 nm, the amount of hot electrons migrated out of shell is high, such that the photogenerated electrons in TiO2 have more chances for jumping to higher energy states, which results in the enhanced separation of electrons and holes. The photocurrent and photovoltage of Ag@SiO2 (2 nm)-TiO2 were respectively 1.68 and 1.54 times higher than those of Ag-TiO2 denoting the highest carriers' migration and utilization efficiency.
关键词 ：
Hot electron Hot electron Localized surface plasmon resonance Localized surface plasmon resonance Migration path Migration path Silica shell Silica shell Silver Silver
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| GB/T 7714 | Yu, Zexin , Sang, Lixia , Chen, Yi-tung . A novel route to visualize the hot electron transfer process in Ag@SiO2-TiO2 for solar-hydrogen conversion [J]. | APPLIED SURFACE SCIENCE , 2020 , 527 . |
| MLA | Yu, Zexin et al. "A novel route to visualize the hot electron transfer process in Ag@SiO2-TiO2 for solar-hydrogen conversion" . | APPLIED SURFACE SCIENCE 527 (2020) . |
| APA | Yu, Zexin , Sang, Lixia , Chen, Yi-tung . A novel route to visualize the hot electron transfer process in Ag@SiO2-TiO2 for solar-hydrogen conversion . | APPLIED SURFACE SCIENCE , 2020 , 527 . |
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摘要 ：
Hydrogen can be produced by photoelectrochemical (PEC) water splitting using a KOH solution as an electrolyte and TiO2 as a photoanode. In this work, we fabricated anatase TiO2 nanoring/nanotube arrays and TiO2 nanotube arrays using an anodic oxidation method, confirmed by field-emission scanning electron microscopy (FESEM) and X-ray diffractometry (XRD), and then conducted the photoelectrochemical experiments with 1 M KOH and Na2SO4 solutions. The bias voltage, small impedance, negative flat-band potential, large capacitance, and depletion layer width in the anatase TiO2-KOH system were observed, leading to the stable and large photocurrent density. To understand the effects of KOH on the interface properties of TiO2/H2O, the electric double layers of anatase TiO2(001), (100), (101)/KOH interfaces were further investigated by calculating the ion-surface interaction with molecular dynamics simulations. It is noted that the number density of potassium ions has the same trend as that of oxygen atoms due to the layering effect in liquids and the strongest ionic hydration of K+ on anatase (101) is observed by analyzing the radial distribution function and coordination number. In addition, the electrostatic characteristics along the TiO2/KOH interfaces were analyzed based on the Grahame double layer model. The potential drops in the outer Helmholtz layer of anatase (001), (100), and (101) surfaces are 1.08, 0.26, and 0.51 V, respectively. Compared with TiO2-H2O systems, the larger potential drops in the TiO2-KOH system explain the phenomenon that KOH solute contributes substantially to a chemical bias in PEC reactions. At the same time, we estimated the depletion layer widths of anatase TiO2(001), (100), and (101) surfaces as 37.48, 173.25, and 64.49 angstrom, respectively, which are of similar magnitude to the experimental results. Anatase TiO2(100) with the widest depletion layer is suggested in photocatalysis. These works provide a clear understanding of interfacial behavior of KOH on anatase TiO2 from a microscale, which can be used to explain the promotion effect of the KOH electrolyte and guide the design of TiO2 nanocrystals in the PEC system.
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| GB/T 7714 | Lei, Lei , Sang, Lixia , Zhang, Yudong et al. Interfacial Analysis of Anatase TiO2 in KOH Solution by Molecular Dynamics Simulations and Photoelectrochemical Experiments [J]. | ACS OMEGA , 2020 , 5 (7) : 3522-3532 . |
| MLA | Lei, Lei et al. "Interfacial Analysis of Anatase TiO2 in KOH Solution by Molecular Dynamics Simulations and Photoelectrochemical Experiments" . | ACS OMEGA 5 . 7 (2020) : 3522-3532 . |
| APA | Lei, Lei , Sang, Lixia , Zhang, Yudong , Gao, Yunlong . Interfacial Analysis of Anatase TiO2 in KOH Solution by Molecular Dynamics Simulations and Photoelectrochemical Experiments . | ACS OMEGA , 2020 , 5 (7) , 3522-3532 . |
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