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学者姓名：桑丽霞
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摘要 ：
In this paper, plasmonic Ag and Cu nanoparticles were co-deposited on TiO2 nanoring/nanotube arrays (TiO2 R/T) by using two-step pulse electrodeposition method for investigating the optical and photoelectrochemical properties, in comparison to monometallic Ag, Cu decoration. By optimizing the electrodeposition cycle times and electrolyte concentration, bimetallic Ag-Cu/TiO2 R/T-0.5 with moderate densities and sizes of Ag and Cu nanoparticles was fabricated and shows great photocatalytic potential, in which, Ag mainly facilitates the generation of hot electrons by absorbing visible light and Cu plays an important role in accelerating the separation and transportation of hot electrons. The hydrogen production rate was tested as 425 mu L h(-1) cm(-2), which is about 1.34-fold enhanced H2 production over TiO2 R/T. Furthermore, molecular dynamics simulations were made for analyzing the interface electrostatic properties between plasmonic nanoparticles of Ag or Cu and the semiconductor TiO2. It is calculated that bimetallic Ag-Cu/TiO2/H2O system has larger interfacial Helmholtz potential than monometallic Ag/TiO2/H2O, Cu/TiO2/H2O and pure TiO2/H2O systems, accelerating the four-electron reaction occurring at the semiconductor/electrolyte interface. This research put forward a feasible and simple pulse electrodeposition method to fabricate bimetallic photoanodes for enhanced hydrogen evolution and an important analysis method of semiconductor/ metal/electrolyte interface characteristics. (C) 2022 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan.
关键词 ：
Interface electrostatic properties Interface electrostatic properties Photoelectrochemical water splitting Photoelectrochemical water splitting Deposition density Deposition density Bimetallic Ag-Cu nanoparticles Bimetallic Ag-Cu nanoparticles Pulse electrodeposition method Pulse electrodeposition method
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| GB/T 7714 | Lei, Lei , Sang, Lixia , Gao, Yunlong . Pulse electrodeposition of Ag, Cu nanoparticles on TiO2 nanoring/nanotube arrays for enhanced photoelectrochemical water splitting [J]. | ADVANCED POWDER TECHNOLOGY , 2022 , 33 (3) . |
| MLA | Lei, Lei 等. "Pulse electrodeposition of Ag, Cu nanoparticles on TiO2 nanoring/nanotube arrays for enhanced photoelectrochemical water splitting" . | ADVANCED POWDER TECHNOLOGY 33 . 3 (2022) . |
| APA | Lei, Lei , Sang, Lixia , Gao, Yunlong . Pulse electrodeposition of Ag, Cu nanoparticles on TiO2 nanoring/nanotube arrays for enhanced photoelectrochemical water splitting . | ADVANCED POWDER TECHNOLOGY , 2022 , 33 (3) . |
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摘要 ：
A supercritical CO2 (sCO(2)) Brayton cycle solar power system based on solid particle thermal energy storage is proposed to enhance the efficiency of concentrated solar power (CSP). The effective thermal conductivity and thermal cycling stability of solid particles are crucial for sCO(2) CSP applications. Some natural and artificial solid particles, such as black silicon carbide, green silicon carbide, white corundum, brown corundum, brown ceramsite sand, garnet, river sand and desert sand are considered as potential thermal energy storage medium due to its low cost and easy availability in large quantities. However, there are few studies about the effective thermal conductivity and stability of these solid particles after thermal cycling tests. In this study, the effective thermal conductivity of these solid particles was measured by the hot wire method. Particularly, the effective thermal conductivity of black silicon carbide and green silicon carbide was measured by modified hot wire method. In addition, the changes of mass, real density, bulk density, void fraction and mean diameter of the above-mentioned solid particles after 100 times thermal cycling tests were also recorded to analyze thermal cycling stability. Based on the results of all the above tests, green silicon carbide exhibits high effective thermal conductivity and good thermal cycling stability, which presents a great potential as a thermal energy storage medium.
关键词 ：
Effective thermal conductivity Effective thermal conductivity sCO(2) concentrated solar power sCO(2) concentrated solar power Solid particles Solid particles Thermal cycling tests Thermal cycling tests The hot wire method The hot wire method
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| GB/T 7714 | Sang, Lixia , Wang, Kaiyin , Zhang, Ran et al. Effective thermal conductivity and thermal cycling stability of solid particles for sCO(2) CSP applications [J]. | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 242 . |
| MLA | Sang, Lixia et al. "Effective thermal conductivity and thermal cycling stability of solid particles for sCO(2) CSP applications" . | SOLAR ENERGY MATERIALS AND SOLAR CELLS 242 (2022) . |
| APA | Sang, Lixia , Wang, Kaiyin , Zhang, Ran , Wang, Yuancong , Wu, Yuting . Effective thermal conductivity and thermal cycling stability of solid particles for sCO(2) CSP applications . | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 242 . |
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摘要 ：
Direct particle receiver of the concentrated solar power (CSP) with a supercritical CO2 (sCO2) Brayton cycle is based on the solid particles to achieve high efficiency at high temperature. Among all kinds of solid particles, desert sand is abundant and cheap, however its solar weighted absorptance and thermal stability remain to be improved. In this work, the dark desert sands were obtained by in-situ coating transition metal oxides via sol-gel combustion process. The thermal stability of the resultant samples was analyzed according to the changes in composition, morphology and optical properties before and after thermal treatment at 800 degrees C for 200 h. Based on the characterization of UV-Vis-NIR diffuse reflectance spectroscopy, the solar weighted absorptance of each sample was calculated. Compared with the original particles, all of dark desert sands have the improved solar weighted absorptance, and the highest value of 0.8635 belongs to desert sand coated with spinel CuMn2O4. Moreover, compared to the original desert sand, each dark desert sand has superior thermal stability. In addition, the specific heat of particles was measured at different temperatures, and it is found that the coating has lesser effects on the specific heat of desert sand. The solar weighted absorptance of dark desert sand nearly unchanged after attrition and the coating remained well maintained on the surface of the sample. This work provides a practical and feasible way to enhance the solar weighted absorptance and thermal stability of desert sand, making it possible to apply in sCO2 CSP.
关键词 ：
Transition metal oxides Transition metal oxides Solar weighted absorptance Solar weighted absorptance Desert sand Desert sand Thermal stability Thermal stability CSP CSP
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| GB/T 7714 | Sang, Lixia , Wang, Kaiyin , Wu, Yuting et al. The improved solar weighted absorptance and thermal stability of desert sand coated with transition metal oxides for direct particle receiver [J]. | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 251 . |
| MLA | Sang, Lixia et al. "The improved solar weighted absorptance and thermal stability of desert sand coated with transition metal oxides for direct particle receiver" . | SOLAR ENERGY MATERIALS AND SOLAR CELLS 251 (2022) . |
| APA | Sang, Lixia , Wang, Kaiyin , Wu, Yuting , Ma, Chongfang . The improved solar weighted absorptance and thermal stability of desert sand coated with transition metal oxides for direct particle receiver . | SOLAR ENERGY MATERIALS AND SOLAR CELLS , 2022 , 251 . |
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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 ：
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 ：
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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