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Hybridization of iron phthalocyanine and MoS_(2)for high-efficiency and durable oxygen reduction reaction

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Journal of Energy Chemistry 2022年第8期31卷 528-538,I0014页

作者： Haibing Meng Xiaolong Liu Xiao Chen Ying Han Chenhui Zhou Qinyuan Jiang Ting Tan rufan zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Laboratory of Theoretical and Computational Nanoscience CAS Key Laboratory of Nanophotonic Materials and DevicesNational Center for Nanoscience and TechnologyChinese Academy of SciencesBeijing 100190China

Hybrid catalysts based on iron phthalocyanine(FePc)have raised much attention due to their promising applications in electrocatalytic oxygen reduction reaction(ORR).Various hybridization strategies have been developed for improving their activity and ***,the influence of different hybridization strategies on their catalytic performance remains *** this study,Fe Pc was effectively distributed on molybdenum disulfide(MoS_(2))forming Fe Pc-based hybrid catalysts,namely Fe Pc-MoS_(2),Fe Pc*-MoS_(2),and Fe Pc-Py-MoS_(2),respectively,to disclose the related *** direct hybridization,the stacked and highly dispersed Fe Pc on MoS_(2)resulted in Fe Pc-MoS_(2),and Fe Pc*-MoS_(2),respectively,in which the substrate and Fe Pc are mainly bound through van der Waals *** covalent hybridization strategy using pyridyl(Py)as a linker,Fe Pc-Py-MoS_(2)hybrid catalyst was *** and theoretical results disclosed that the linker hybridization of Fe Pc and MoS_(2)facilitated the exposure of Fe-N4 sites,maintained the intrinsic activity of Fe Pc by forming a more dispersed phase and increased the durability via Fe-N bonding,rendering the Fe Pc-Py-MoS_(2)an excellent ORR hybrid *** with van der Waals hybridized Fe Pc-MoS_(2)and Fe Pc*-MoS_(2)in alkaline media,the linker hybridized Fe Pc-Py-MoS_(2)showed an obviously enhanced ORR activity with a half-wave potential(E_(1/2))of 0.88 V vs RHE and an ultralow Tafel slope of 26 m V ***,the Fe Pc-Py-MoS_(2)exhibited a negligible decay of E_(1/2) after 50,000 CV cycles for ORR,showing its superior *** work gives us more insight into the influence of different hybrid strategies on Fe Pc catalysts and provides further guidance for the development of highly efficient and durable ORR catalysts.

关键词： FePc MoS_(2) Hybridization strategies Charge transfer ORR performance

Nitrogen-doped carbon dots-modified Prussian blue with sandwichlike structure as a high-performance electrochromic material

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Nano Research 2024年第10期17卷 9174-9180页

作者： Yaqi zhang Lide Li Siming Zhao Yilin Ding Nan Shen Yujie Sun Hao Wang Jingfa Li rufan zhang School of Chemistry and Materials Science School of Physics and Optoelectronic EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Prussian blue(PB),as a promising inorganic electrochromic material(ECM),has been widely used in smart windows,displays,sensors,***,there are still many challenges for PB to achieve high electrochromic ***,we synthesized nitrogen-doped carbon dots-modified PB film(defined as PB@N-CDs)with a sandwich-like structure by a simple stepwise electrodeposition *** carbon dots show an obvious advantage in ultrafast electron transfer ability,which can reduce charge loss during the transfer process,improve the electrochemical activity on both sides of PB,and thus facilitate a rapid electrochromic ***,the surface of nitrogen-doped carbon dots contains multiple organic functional groups,which widen the movement path of K+ions under electrostatic ***,the PB@N-CDs film exhibits a short bleaching/coloring time(0.5/0.9 s)and a superior optical modulation range(78.6%).Particularly,the coloring efficiency has been significantly improved to 137.71 cm^(2)/C(at 700 nm).All of these results open up new avenues for developing highperformance PB-based ECMs and promoting their applications in corresponding electrochromic devices(ECDs)and smart windows.

关键词： electrochromic Prussian blue carbon dots nanostructure

Oxygen-deficient tungsten oxide nanoflowers for dynamically tunable near-infrared light transmittance of smart windows

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Nano Research 2023年第10期16卷 12165-12172页

作者： Ya Huang Baoshun Wang Pei Lyu Siming Zhao Xueke Wu Shiliang zhang Run Li Qinyuan Jiang Fei Wang Yanlong Zhao rufan zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Electrochromic smart windows have attracted much attention in energy-saving buildings because of their ability to selectively modulate visible(VIS)and near-infrared(NIR)light *** is known,the NIR region accounts for about 50%of the total solar ***,reducing the NIR transmittance of windows will play a crucial role in reducing the energy consumption of ***,for most of the reported electrochromic materials(ECMs)-based windows,it remains a longlasting challenge about how to achieve a low NIR transmittance during the past *** this work,we synthesize oxygendeficient tungsten oxide(WO_(3−x))nanoflowers(NFs)by a simple and efficient method that is facile for their mass *** WO_(3−x)NFs exhibit low NIR transmittance of only 4.11%,0.60%,and 0.19%at 1200,1600,and 1800 nm,respectively,due to the localized surface plasmon resonance(LSPR)***,the WO_(3−x)NFs exhibit an excellent dual-band modulating ability for both VIS and NIR *** are able to operate in three distinct modes,including a bright mode,a cool mode,and a dark ***,the WO_(3−x)NFs exhibit a fast bleaching/coloring time(1.54/6.67 s),and excellent cycling stability(97.75%of capacity retention after 4000 s).

关键词： electrochromic tungsten oxide dual-band smart window infrared

Mechanical Behavior of Single and Bundled Defect-Free Carbon Nanotubes

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Accounts of Materials Research 2021年第11期2卷 998-1009页

作者： Yunxiang Bai Hongjie Yue rufan zhang Weizhong Qian Zhong zhang Fei Wei Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China CAS Key Laboratory of Nanosystem and Hierarchical Fabrication and CAS Center for Excellence in Nanoscience National Center for Nanoscience and TechnologyBeijing 100190China

CONSPECTUS:Superstrong materials can be utilized in many fields such as bulletproof vests,airframes,suspension bridges,flywheel energy storage,*** one of the strongest materials,carbon nanotubes(CNTs)can potentially be used to fabricate superstrong ***,the tensile strength of CNTs is impaired a lot by defects,and the CNT fibers prepared so far have strengths much lower than that of a single CNT,showing a“size effect”.The conventional study of solid mechanics is usually based on the assumption that materials contain ***-free ultralong CNTs can hopefully help us avoid the“size effect”of nanomaterials and produce superstrong CNT *** would also provide a system for the study of the mechanical behavior of ideal solids with a nonlocalized“quantum stress singularity”.In this Account,we discuss our recent studies on the mechanical behavior of defect-free single CNTs and CNT ***,we introduce the defect-free structure of ultralong CNTs,which is one type of ideal ***,we review the investigation of the static tensile properties and dynamic fatigue resistance and their temperature-dependence of single centimeters long defect-free *** results showed that defect-free CNTs have superior comprehensive mechanical properties,including superstrength,-toughness,*** from traditional materials,the fatigue lifetime and fracture of CNTs are dominated by the first single-bond-sized defect(quantum stress singularity),showing“superbrittleness”.Third,by using a gas flow focusing in situ synthesis method as well as a synchronous tightening and relaxing strengthening strategy,we successfully fabricated CNT bundles with tensile strengths approaching that of single CNTs and showed that the“size effect”can be *** addition,the advantages and promising future of using CNTs in flywheel energy storage are ***,we provide our perspectives on the challenges and future directions in this field.

关键词： singularity fatigue Bundle

Multicolored structural coloration of carbon nanotube fibers

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SusMat 2023年第1期3卷 102-110页

作者： Run Li Shiliang zhang Hang Chen Ya Huang Baoshun Wang Xueke Wu Qinyuan Jiang Siming Zhao Fei Wang Yanlong Zhao rufan zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijingChina

Carbon nanotube fibers(CNTFs)are endowed with excellent mechanical,electrical,and thermal properties and are considered promising candidates in numerous cutting-edge ***,the inherent black color of CNTFs hinders their practical application in fields with high aesthetic requirements such as wearable devices and smart *** to the smooth surface and chemical inertness,CNTFs are hard to be dyed by conventional chemical dyes or colorful ***,we realize a structural coloration of CNTFs by coating them with two metal oxide layers via atomic layer *** three elements of color,that is,hue,saturation,and brightness,can be controlled by adjusting the types and thickness of each oxide *** CNTFs with wide color gamut and high saturation are achieved through different combinations.A film interference model is also established to reveal the mechanism of the structural coloration,which is a comprehensive result of thin-film interference and surface roughness *** calculated reflectance well fits the measured results by introducing surface roughness ***,the colored CNTFs are not iridescent because of retinal signal delay,which will further expand their applications.

关键词： atomic layer deposition carbon nanotube structural color

Development and Prospects of China's Space Technology——Will China's space technology be brilliant again at the turn of the century?

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Aerospace China 1995年第2期 27-30页

作者： By zhang rufan

For China,at the turn of the century,how to keep the position of the space power,how to stimulate the enthusiasm of the space technicians and how to keep pace with the world space technology,all of these questions lie ahead of the Chinese *** we may say China’s space industry now is in the key *** the space industry draws great attention from the central government and the people of the country,it will have a brilliant future in the 21st *** should put our eyes on the 21st century and prepare to explore space *** is difficult for us to keep pace with the times if we do not explore space resources and try to earn "the money in space".

关键词： very Will China’s space technology be brilliant again at the turn of the century Development and Prospects of China’s Space Technology

Progress and perspective on high-strength and multifunctional carbon nanotube fibers

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Science Bulletin 2022年第8期67卷 784-787页

作者： Run Li Qinyuan Jiang rufan zhang Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Materials are foundations of human *** the Stone Age to the present new material age,the history of human civilization is also a history of the development of *** mass production of a new generation of materials with strength,flexibility and fatigue resistance that are orders of magnitude higher than the current materials is of great importance in both science and engineering.

关键词：碳纳米管纤维 materials. fatigue

Morphology and property investigation of primary particulate matter particles from different sources

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Nano Research 2018年第6期11卷 3182-3192页

作者： rufan zhang Chong Liu Guangmin Zhou Jie Sun Nian Liu Po-Chun Hsu Haotian Wang Yongcai Qiu Jie Zhao Tong Wu Wenting Zhao Yi Cui Department of Materials Science and Engineering Stanford University Stanford CA 94305 USA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA

Particulate matter （PM） pollution has become a major environmental concern in many developing countries. PM pollution control remains a great challenge owing to the complex sources and evolution processes of PM particles. There are two categories of PM, i.e., primary and secondary PM particles, and the primary PM emissions play a key role in the formation of PM pollution. Knowledge of primary PM particle compositions, sources, and evolution processes is of great importance to the effective control of PM pollution. In order to characterize PM particles effectively, their fundamental properties including the morphology, concentration distribution, surface chemistry, and composition must be systematically investigated. In this study, we collected and analyzed six types of PM10 and PM2.s particles from different sources using an in situ sampling approach. The concentration distributions of PM particles were analyzed and comparative analysis of the morphologies, distributions, capture mechanisms, and compositions of PM particles was conducted using scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and energy-dispersive X-ray spectroscopy. We found that there were significant differences in the structures, morphologies, and capture mechanisms of PM2.5 and PM10 particles. The systematic comparative investigation in this work will benefit the study of evolution processes and the effective control of PM pollution in the future.

关键词： particulate matter 2.5(PM2.5) source analysis nanofiber filtration property distribution characterization

Development of China's Application Satellites

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Aerospace China 1992年第2期 24-28页

作者： zhang Guofu, Vice President of CAST, and zhang rufan

The development of China’s space technology has been the focus of the world attention. Since the successful launch of DFH-1 artificial earth satellite on April 24, 1970, China has sent 33 indigenous satellites, including scientific experimental satellites, technical experimental satellites and meteorological satellites. All the experimental and operational satellites have played an important role in the construction of national economy and defense, and provided the advanced prapagation instruments for China’s science, culture and education, and people both in cities and countries could watch TV andlisten to the radio and take part in telelecture. This has improved the cultural quality of the whole nation and accelerated the development of the four modernizations.

关键词： meteorological operational instruments indigenous watch launch defense accelerated sands polar