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Light-driven directional ion transport for enhanced osmotic energy harvesting

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National Science Review 2021年第8期8卷 178-185页

作者： Kai Xiao Paolo Giusto fengxiang chen Ruotian chen Tobias Heil Shaowen Cao Lu chen Fengtao Fan Lei Jiang Max Planck Institute of Colloids and Interfaces Department of Colloid Chemistry Key Laboratory of Bio-inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang University State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University State Key Laboratory of Catalysis 2011-iChEMDalian National Laboratory for Clean Energy (DNL)Dalian Institute of Chemical Physics(DICP)Chinese Academy of Sciences State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Light-driven ion(proton) transport is a crucial process both for photosynthesis of green plants and solar energy harvesting of some archaea. Here, we describe use of a TiO2/C3N4semiconductor heterojunction nanotube membrane to realize similar light-driven directional ion transport performance to that of biological systems. This heterojunction system can be fabricated by two simple deposition steps. Under unilateral illumination, the TiO2/C3N4heterojunction nanotube membrane can generate a photocurrent of about 9 μA/cm~2, corresponding to a pumping stream of ～5500 ions per second per nanotube. By changing the position of TiO2and C3N4, a reverse equivalent ionic current can also be realized. Directional transport of photogenerated electrons and holes results in a transmembrane potential, which is the basis of the light-driven ion transport phenomenon. As a proof of concept, we also show that this system can be used for enhanced osmotic energy generation. The artificial light-driven ion transport system proposed here offers a further step forward on the roadmap for development of ionic photoelectric conversion and integration into other applications, for example water desalination.

关键词： ion pump ion transport nanofluidic porous membrane carbon nitride

Overcoming diffusion-related limitations in semiconductor defect imaging with phonon-plasmon-coupled mode Raman scattering

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Light(Science & Applications) 2018年第1期7卷 854-861页

作者： Changkui Hu Qiong chen fengxiang chen T.H.Gfroerer M.W.Wanlass Yong Zhang University of North Carolina at Charlotte CharlotteNC 28223USA Wuhan University of Technology WuhanHubei 430070China Davidson College DavidsonNC 28035USA National Renewable Energy Laboratory GoldenCO 80401USA

Carrier diffusion is of paramount importance in many semiconductor devices,such as solar cells,photodetectors,and power *** defects prevent such devices from reaching their full performance *** a large carrier diffusion length indicates high material quality,it also implies increased carrier depletion by an individual extended defect(for instance,a dislocation)and obscures the spatial resolution of neighboring defects using optical *** commonly utilized photoluminescence(PL)imaging,the spatial resolution is dictated by the diffusion length rather than by the laser spot size,no matter the spot is at or below the diffraction ***,we show how Raman imaging of the LO phonon-plasmon-coupled mode can be used to recover the intrinsic spatial resolution of the optical system,and we demonstrate the effectiveness of the technique by imaging defects in GaAs with diffraction-limited optics,achieving a 10-fold improvement in ***,by combining Raman and PL imaging,we can independently and simultaneously determine the spatial dependence of the electron density,hole density,radiative recombination rate,and non-radiative recombination rate near a dislocation-like defect,which has not been possible using other techniques.

关键词： scattering diffusion defect

Chaos Synchronization of Uncertain Lorenz System via Single State Variable Feedback

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Applied Mathematics 2013年第11期4卷 7-12页

作者： fengxiang chen Tong Zhang School of Automotive Studies Tongji University Shanghai China Clean Energy Automotive Engineering Center Tongji University Shanghai China

This paper treats the problem of chaos synchronization for uncertain Lorenz system via single state variable information of the master system. By the Lyapunov stability theory and adaptive technique, the derived controller is featured as follows: 1) only single state variable information of the master system is needed;2) chaos synchronization can also be achieved even if the perturbation is occurred in some parameters of the master chaotic system. Finally, the effectiveness of the proposed controllers is also illustrated by the simulations as well as rigorous mathematical proofs.

关键词： Uncertain Lorenz System Single State Variable Chaos Synchronization

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燃料电池系统空气供应内模解耦控制器设计

同济大学学报（自然科学版） 2016年第12期44卷 1924-1930页

作者：陈凤祥陈兴同济大学汽车学院上海201804 同济大学新能源汽车工程中心上海201804

针对高压质子交换膜燃料电池空气供应系统的空气流量和进气压力具有较强的耦合性这个特性,将内模控制原理与多变量解耦控制理论相结合,提出了空气流量和进气压力的鲁棒解耦控制策略.仿真结果表明,采用内模解耦控制不仅能实现被控量的解... 详细信息

针对高压质子交换膜燃料电池空气供应系统的空气流量和进气压力具有较强的耦合性这个特性,将内模控制原理与多变量解耦控制理论相结合,提出了空气流量和进气压力的鲁棒解耦控制策略.仿真结果表明,采用内模解耦控制不仅能实现被控量的解耦,而且在系统模型失配的情况下可以获得比传统PID(比例-积分-微分)解耦控制器更好的鲁棒性;同时控制器参数少,整定简单.

关键词：质子交换膜燃料电池(PEMFC) 空气供应系统内模解耦控制高压

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Full‑Color Tunable and Highly Fire‑Retardant Colored Carbon Fibers

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Advanced Fiber Materials 2023年第5期5卷 1618-1631页

作者： Yuxin Luo Yu Zhang Tonghe Xing Annan He Shichao Zhao Zhiyu Huang Zihui Liang Xin Liu Yequn Liu Yuxiu Yu Yong Qin fengxiang chen Weilin Xu State Key Laboratory of New Textile Materials and Advanced Processing Technologies and Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200People’s Republic of China State Key Laboratory of Coal Conversion CAS Key Laboratory of Carbon Materials and Analytical Instrumentation CenterInstitute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001People’s Republic of China State Key Laboratory of Bio‑Fibers and Eco‑Textiles Institute of Functional Textiles and Advanced MaterialsCollege of Textiles and ClothingQingdao UniversityQingdao 266071People’s Republic of China National Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile UniversityWuhan 430200People’s Republic of China

Carbon fibers(CFs)are widely used in various cutting-edge fields,such as aerospace,military,automobiles,and sports,owing to their unique combination of excellent mechanical properties,good thermal stability,and ***,their inherent super-black appearance makes it difficult to satisfy the aesthetic/fashion requirements of the colorful world,and the flammability of CFs severely limits their practical utilization in high-temperature and other extreme ***,we fabricated full-color tunable colored CFs on a large-scale via atomic layer deposition,based on the monolayer film interference *** exhibited brilliant colors and excellent environmental durability in extreme environments,such as intense ultraviolet(UV)irradiation,accelerated laundering,friction,high-temperature,and low-temperature *** CFs also exhibited excellent fire-retardant performance that could withstand alcohol-lamp flame burning for 60 *** work provides insights into an innovative material/structural design that can help achieve rapid development of the CF industry and global carbon neutrality/sustainability.

关键词： Carbon fibers Carbon fiber fabrics Full-colors Environmental durability Fire-retardant

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宽角度硅太阳电池减反射膜的优化设计

太阳能学报 2008年第10期29卷 1262-1266页

作者：陈凤翔汪礼胜武汉理工大学理学院物理科学与技术系武汉430070

以太阳电池减反射膜为研究对象,考虑太阳光从0°～60°宽角度入射,同时结合硅的光谱响应和太阳光谱分布,采用加权平均反射率作为评价膜系质量的标准,利用数值计算设计了的最佳双层减反射膜SiN_x/SiO_x。计算结果表明30°是设计减反射膜... 详细信息

以太阳电池减反射膜为研究对象,考虑太阳光从0°～60°宽角度入射,同时结合硅的光谱响应和太阳光谱分布,采用加权平均反射率作为评价膜系质量的标准,利用数值计算设计了的最佳双层减反射膜SiN_x/SiO_x。计算结果表明30°是设计减反射膜的最佳优化角度。对于入射介质为空气时,最优薄膜参数为n_(SiN_x)=2.3,d_(SiN_x)=56nm, n_(SiO_2)=1.46,d_(SiO_2)=90nm。当太阳电池封装后,即入射介质为硅胶时,最佳膜系参数为n_(SiN_x)=2.3,d_(SiN_x)=65nm,n_(SiO_x) =1.63nm,d_(SiO_x)=80nm。

关键词：太阳电池减反射膜加权平均反射率宽角度

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Large‑scale Fabrication of Snake‑skin‑inspired Protective Composite Textiles

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Advanced Fiber Materials 2024年第4期6卷 978-992页

作者： Qing Liu fengxiang chen Tingting Dong Woong‑Ryeol Yu Chaoyu chen Gaoming Jiang Zhijia Dong Pibo Ma Engineering Research Center of Knitting Technology Ministry of EducationCollege of Textile Science and EngineeringJiangnan UniversityWuxi 214122P.R.China State Key Laboratory of New Textile Materials and Advanced Processing Technologies/National Local Joint Laboratory for Advanced Textile Processing and Clean Production/Hubei Key Laboratory of Digital Textile Equipment Wuhan Textile UniversityWuhan 430200P.R.China Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National UniversitySeoul 08826Republic of Korea

Inspired by the overlapping structure of snake scales,a reinforced scale-like knitted fabric(R-SLKF)was created in this *** achieve this,short carbon fibers in an epoxy resin(ER)matrix were incorporated into the scales of an *** resulting textile is a highly stable protective composite that is flexible,warm,and thermally *** addition,supe-rior stab-resistance is ensured through rigid protective blocks in the R-SLKF,making up a hard overlapping scale region,besides satisfactory flexibility via soft twisted ultra-high-molecular-weight polyethylene yarn-based *** R-SLKF achieves high stab resistance(peak load of approximately 600 N for a single scale thickness of 2 mm),good flexibility(~290 mN cm),and breathability(100 MPa,423 mm/s),coupled with good warmth retention and thermal insulation prop-erties(0.28℃/s),which are superior to previously reported protective composite *** the results,the combination of desirable individual protection,excellent wearability and comfort enables human beings to survive in extremely danger-ous *** element simulations provided valuable insights into the factors influencing the stab resistance of R-SLKF and elucidated the underlying anti-puncture mechanism in accordance with the experimental *** study presents a novel strategy for the facile industrial fabrication of flexible and lightweight protective composite textiles,which is expected to enhance the structure and material design for future innovations and provide advantages for personal protec-tive equipment in various industrial fields.

关键词： Scale-like knitted fabric Stab-resistance Flexibility Air permeability Warmth retention and thermal insulation properties

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微波光电导中的灵敏度分析

太阳能学报 2006年第1期27卷 23-29页

作者：陈凤翔崔容强徐林上海交通大学物理系太阳能研究所上海200240

对微波光电导法测量半导体少数载流子寿命的测试系统进行灵敏度分析。利用Maxwell方程组的求解和转移矩阵的利用,可对微波光电导测试系统求出反射系数和灵敏度。讨论了灵敏度与样品的电导率、厚度的关系。通过比较一般的测试系统以及它... 详细信息

对微波光电导法测量半导体少数载流子寿命的测试系统进行灵敏度分析。利用Maxwell方程组的求解和转移矩阵的利用,可对微波光电导测试系统求出反射系数和灵敏度。讨论了灵敏度与样品的电导率、厚度的关系。通过比较一般的测试系统以及它的两种特殊情况发现：对于所有电导率的样品,在测试样品背后的合适位置放置金属反射器可增加测试系统的灵敏度。

关键词：灵敏度微波光电导反射系数

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加强交流相互借鉴共创美好未来

拉丁美洲研究 2007年第2期29卷 6-7页

作者：陈凤翔中共中央对外联络部

很高兴有机会再次参加中国社会科学院举办的国际学术论坛。对于我来说，每次参加这样的学术论坛都是一次难得的学习机会。今年论坛的主题是“2006～2007年拉丁美洲和加勒比：变化与选择”，副题分别是“拉美形势的特点与发展趋势”、“... 详细信息

很高兴有机会再次参加中国社会科学院举办的国际学术论坛。对于我来说，每次参加这样的学术论坛都是一次难得的学习机会。今年论坛的主题是“2006～2007年拉丁美洲和加勒比：变化与选择”，副题分别是“拉美形势的特点与发展趋势”、“拉美大选后的政治格局的变化”、“拉美的选择对中国的启示”。

关键词：经验教训政治中华人民共和国学术论坛中拉关系不发达国家新自由主义大选