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Tribological properties of aqueous solutions with lauric acid random copolyether (LPE) added

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Science China(Technological Sciences) 2013年第12期56卷 3007-3011页

作者： ZHANG ChaoHui liu sisi SUN YueTao School of Mechanical Electronic and Control Engineering Beijing Jiaotong University

This work presents the results of tribological investigations of lubricating substances composed of water and a nonionic surfactant:lauric acid random copolyether(LPE),as *** the current stage of investigation,aqueous solutions with LPE additives are prepared and subsequently the lowering friction and reducing wear behaviors are tested by means of friction/wear tester,in conjunction with that the film forming properties experiments are carried out with a nanoscale film thickness measure *** contact is under condition of steel-steel *** results show that the coefficient of friction measured decreases considerably to about over 60%relative to *** film thickness data of friction process lubricated by aqueous solutions with LPE added show that the lubrication is in boundary lubrication *** results indicate that aqueous solutions with LPE added can be used to improve the lubricity and they may be applied to real tribological systems.

关键词： lauric acid random copolyether(LPE) nonionic surfactant aqueous solution tribology

Deciphering engineering principle of three-phase interface for advanced gas-involved electrochemical reactions

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Journal of Energy Chemistry 2023年第5期80卷 302-323,I0008页

作者： Yanzheng He sisi liu Mengfan Wang Qiyang Cheng Tao Qian Chenglin Yan Collaborative Innovation Center of Suzhou Nano Science and Technology College of EnergySoochow UniversitySuzhou 215006JiangsuChina School of Chemistry and Chemical Engineering Nantong UniversityNantong 226019JiangsuChina Light Industry Institute of Electrochemical Power Sources Suzhou 215600JiangsuChina

As an alternative to conventional energy conversion and storage reactions,gas-involved electrochemical reactions,including the carbon dioxide reduction reaction(CO_(2)RR),nitrogen reduction reaction(NRR)and hydrogen evolution reaction(HER),have become an emerging research direction and have gained increasing attention due to their advantages of environmental friendliness and *** studies have been designed to accelerate sluggish kinetics but with limited *** of them promote the reaction by modulating the intrinsic properties of the catalyst,ignoring the synergistic effect of the reaction as a *** to the introduction of gas,traditional liquid-solid two-phase reactions are no longer applicable to future *** gas-involved electrochemical reactions mostly occur at the junctions of gaseous reactants,liquid electrolytes and solid catalysts,the focus of future research on reaction kinetics should gradually shift to three-phase reaction *** this review,we briefly introduce the formation and constraints of the three-phase interface and propose three criteria to judge its merit,namely,the active site,mass diffusion and electron mass ***,a series of modulation methods and relevant works are discussed in detail from the three improvement directions of‘exposing more active sites,promoting mass diffusion and accelerating electron transfer’.Definitively,we provide farsighted insights into the understanding and research of three-phase interfaces in the future and point out the possible development direction of future regulatory methods,hoping that this review can broaden the future applications of the three-phase interface,including but not limited to gas-involved electrochemical reactions.

关键词： Three-phase reaction Surface reactions Mass diffusion Electron transfer Gas-involved electrochemical reactions

Altering the rate-determining step over cobalt single clusters leading to highly efficient ammonia synthesis

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National Science Review 2021年第5期8卷 110-118页

作者： sisi liu Mengfan Wang Haoqing Ji Xiaowei Shen Chenglin Yan Tao Qian College of Energy Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu ProvinceSoochow University

Activation of high-energy triple-bonds of N2is the most significant bottleneck of ammonia synthesis under ambient conditions. Here, by importing cobalt single clusters as strong electron-donating promoter into the catalyst, the rate-determining step of ammonia synthesis is altered to the subsequent proton addition so that the barrier of N2dissociation can be successfully overcome. As revealed by density functional theory calculations, the N2dissociation becomes exothermic over the cobalt single cluster upon the strong electron backdonation from metal to the N2antibonding orbitals. The energy barrier of the positively shifted rate-determining step is also greatly reduced. At the same time, advanced sampling molecular dynamics simulations indicate a barrier-less process of the N2approaching the active sites that greatly facilitates the mass transfer. With suitable thermodynamic and dynamic property, a high ammonia yield rate of 76.2 μg h–1mgcat–*** superior Faradaic efficiency of 52.9% were simultaneously achieved.

关键词： nitrogen reduction reaction rate-determining step cobalt single cluster mass transfer molecular dynamics simulations

Advanced In Situ Characterization Techniques for Direct Observation of Gas-Involved Electrochemical Reactions

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Energy & Environmental Materials 2023年第6期6卷 73-112页

作者： Yanzheng He sisi liu Mengfan Wang Qiyang Cheng Haoqing Ji Tao Qian Chenglin Yan Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry College of EnergySoochow UniversitySuzhou 215006China School of Chemistry and Chemical Engineering Nantong UniversityNantong 226019China Light Industry Institute of Electrochemical Power Sources Suzhou 215600China

Gas-involved electrochemical reactions provide feasible solutions to the worldwide energy crisis and environmental *** has been recognized that various elements of the reaction system,including catalysts,intermediates,and products,will undergo real-time variations during the reaction process,which are of significant meaning to the in-depth understanding of reaction mechanisms,material structure,and active *** judicious tools for real-time monitoring of the changes in these complex elements,in situ techniques have been exposed to the spotlight in recent *** review aims to highlight significant progress of various advanced in situ characterization techniques,such as in situ X-ray based technologies,in situ spectrum technologies,and in situ scanning probe technologies,that enhance our understanding of heterogeneous electrocatalytic carbon dioxide reduction reaction,nitrogen reduction reaction,and hydrogen evolution *** provide a summary of recent advances in the development and applications of these in situ characterization techniques,from the working principle and detection modes to detailed applications in different reactions,along with key questions that need to be ***,in view of the unique application and limitation of different in situ characterization techniques,we conclude by putting forward some insights and perspectives on the development direction and emerging combinations in the future.

关键词： carbon dioxide reduction reaction gas-involved electrochemical reactions hydrogen evolution reaction in situ characterizations nitrogen reduction reaction

Self-Assembled Al Nanostructure/ZnO Quantum Dot Heterostructures for High Responsivity and Fast UV Photodetector

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Nano-Micro Letters 2020年第9期12卷 96-108页

作者： sisi liu Ming‑Yu Li Jianbing Zhang Dong Su Zhen Huang Sundar Kunwar Jihoon Lee School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Science Wuhan University of TechnologyWuhan 430070People’s Republic of China Wuhan National Laboratory for Optoelectronics(WNLO)and School of Engineering Sciences Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China College of Electonics and Information Kwangwoon UniversityNowon-guSeoul 01897Republic of Korea Institute of Nanoscale Science and Engineering University of ArkansasFayettevilleAR 72701USA

Light confinement induced by spontaneous near-surface resonance is inherently determined by the location and geometry of metallic nanostructures(NSs),offering a facile and effective approach to break through the limitation of the light-mater interaction within the photoactive ***,we demonstrate high-performance Al NS/ZnO quantum dots(Al/ZnO) heterostructure UV photodetectors with controllable morphologies of the self-assembled Al *** Al/ZnO heterostructures exhibit a superior light utilization than the ZnO/Al heterostructures,and a strong morphological dependence of the Al NSs on the optical properties of the *** inter-diffusion of Al atoms into ZnO matrixes is of a great benefit for the carrier ***,the optimal photocurrent of the Al/ZnO heterostructure photodetectors is significantly increased by 275 times to ~1.065 mA compared to that of the pristine ZnO device,and an outstanding photoresponsivity of 11.98 A W-1 is correspondingly achieved under 6.9 MW cm-2 UV light illumination at 10 V *** addition,a relatively fast response is similarly witnessed with the Al/ZnO devices,paving a path to fabricate the high-performance UV photodetectors for applications.

关键词： Al/ZnO heterostructure photodetectors Plasmonic enhancement ZnO quantum dots Self-assembled Al nanostructures

A transposon-introduced G-quadruplex motif is selectively retained and constrained to downregulate CYP321A1

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Insect Science 2022年第6期29卷 1629-1642页

作者： Zhongyuan Deng Yuting Zhang Chao Gao Wei Shen Shan Wang Xinzhi Ni sisi liu Xianchun Li School of Agricultural Sciences Zhengzhou UniversityZhengzhouChina Department of Entomology and BIO5 Institute University of ArizonaTucsonAzUSA StateKeyLaboratory ofAgricultural Microbiology Huazhong Agricultural UniversityWuhanChina Colle of Science Huazhong Agricultural UniversityWuhanChina USDA-ARS Crop Genetics and Breeding Research UnitUniversity of GeorgiaTifton CampusTitonGAUSA

Insects utilize xenobiotic compounds to up-and downregulate cytochrome P450 monooxygenases(P450s)involved in detoxification of toxic xenobiotics including phytochemicals and pesticides.G-quadruplexes(G4)-forming DNA motifs are enriched in the promoter regions of transcription factors and function as cis-acting elements to regulate these *** and how P450s gain and keep G4 DNA motifs to regulate their expression still remain ***,we show that CYP321A1,a xenobiotic-metabolizing P450 from Helicoverpa zea,a polyphagous insect of economic importance,has acquired and preserved a G4 DNA motif by selectively retaining a transposon known as HzIS1-3 that carries this G4 DNA motif in its promoter *** HzIS1-3 G4 DNA motif acts as a silencer to suppress the constitutive and induced expression of CYP321A1 by plant allelochemicals flavone and xanthotoxin through folding into an intramolecular parallel or hybrid-1 conformation in the absence or presence of K^(+).The G4 ligand N-methylmesoporphyrin IX(NMM)strengthens the silencing effect of HzIS1-3 G4 DNA motif by switching its structure from hybrid-1 to *** enrichment of transposons in P450s and other environment-adaptation genes implies that selective retention of G4 DNA motif-carrying transposons may be the main evolutionary route for these genes to obtain G4 DNA motifs.

关键词： DNA secondary structure gene regulation Helicoverpa zea natural selec-tion plantallelochemicals signalingpathway silencer

Diffusive gradients in thin films(DGT) probe for effectively sampling of per-and polyfluoroalkyl substances in waters and sediments

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Journal of Environmental Sciences 2022年第11期34卷 90-97页

作者： Yuanyuan Yang sisi liu Runmei Wang Cailin Li Jianhui Tang Tao Chen Guang-Guo Ying Chang-Er Chen Environmental Research Institute/School of Environment Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSouth China Normal UniversityGuangzhou 510006China Key Laboratory of Coastal Environmental Processes and Ecological Remediation Yantai Institute of Coastal Zone ResearchChinese Academy of SciencesYantai 264003China

The passive sampling technique, diffusive gradients in thin films(DGT) has attracted increasing interests as an in-situ sampler for organic contaminants including per-and polyfluoroalkyl substances(PFAS). However, its effectiveness has been questioned because of the small effective sampling area(3.1 cm^(2)). In this study, we developed a DGT probe for rapid sampling of eight PFAS in waters and applied it to a water-sediment system. It has a much larger sampling area(27 cm^(2)) and as a result lower method quantification limits(0.15 –0.21 ng/L for one-day deployment and 0.02 – 0.03 ng/L for one-week deployment) and much higher(by > 10 factors) sampling rate(100 m L/day) compared to the standard DGT(piston configuration). The sampler could linearly accumulate PFAS from wastewater, was sensitive enough even for a 24 hr deployment with performance comparable to grab sampling(500m L). The DGT probe provided homogeneous sampling performance along the large exposure area. The use of the probe to investigate distributions of dissolved PFAS around the sediment-water interface was demonstrated. This work, for the first time, demonstrated that the DGT probe is a promising monitoring tool for trace levels of PFAS and a research tool for studying their distribution, migration, and fate in aquatic environments including the sediment-water interface.

关键词： Diffusive gradients in thin films(DGT) Passive sampling Per-and polyfluoroalkyl substances(PFAS) Sediment Aquatic environments

Eliminating nitrogen chemisorption barrier with single-atom supported yttrium cluster via electronic promoting effect for highly efficient ammonia synthesis

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Nano Research 2023年第2期16卷 2185-2191页

作者： Yuzhuo Jiang Mengfan Wang sisi liu Lifang Zhang Siyi Qian Yufeng Cao Yu Cheng Tao Qian Chenglin Yan School of Chemistry and Chemical Engineering Nantong UniversityNantong 226019China Key Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry College of EnergySoochow UniversitySuzhou 215006China Light Industry Institute of Electrochemical Power Sources Suzhou 215600China

Nitrogen chemisorption is a prerequisite for efficient ammonia synthesis under ambient conditions,but promoting this process remains a significant ***,by loading yttrium clusters onto a single-atom support,an electronic promoting effect is triggered to successfully eliminate the nitrogen chemisorption barrier and achieve highly efficient ammonia *** functional theory calculations reveal that yttrium clusters with abundant electron orbitals can provide considerable electrons and greatly promote electron backdonation to the N2 antibonding orbitals,making the chemisorption process ***,according to the“hot atom”mechanism,the energy released during exothermic N2 chemisorption would benefit subsequent N2 cleavage and hydrogenation,thereby dramatically reducing the energy barrier of the overall *** expected,the proof-of-concept catalyst achieves a prominent NH3 yield rate of 48.1μg·h^(−1)·mg^(−1)at−0.2 V versus the reversible hydrogen electrode,with a Faradaic efficiency of up to 69.7%.This strategy overcomes one of the most serious obstacles for electrochemical ammonia synthesis,and provides a promising method for the development of catalysts with high catalytic activity and selectivity.

关键词： ammonia synthesis yttrium cluster electronic promoting effect rate-determining step nitrogen chemisorption barrier

Efficient quantum dot infrared solar cells with enhanced lowenergy photon conversion via optical engineering

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Nano Research 2023年第2期16卷 2392-2398页

作者： sisi liu Ming-Yu Li Kao Xiong Jianbo Gao Xinzheng Lan Daoli Zhang Liang Gao Jianbing Zhang Jiang Tang School of Science Wuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Wuhan 430074China Department of Chemistry Brock UniversitySt.CatharinesON L2S 3A1Canada Wenzhou Advanced Manufacturing Technology Research Institute Huazhong University of Science and TechnologyWenzhou 325035China Shenzhen Huazhong University of Science and Technology Research Institute Shenzhen 518057China Optics Valley Laboratory Wuhan 430074China

Infrared(IR)solar cells are promising devices for improving the power conversion efficiency(PCE)of conventional solar cells by expanding the utilization region of the sunlight spectrum to near-infrared *** solar cells based on colloidal quantum dots(QDs)have attracted extensive attention due to the widely tunable absorption spectrum controlled by dot size and the unique solution ***,the trade-off in QD solar cells between light absorption and photo-generated carrier collection has limited the further improvement of ***,we present high-performance PbS QD IR solar cells resulting from the combination of boosted light absorption and optimized carrier *** constructing an optical resonance cavity,the light absorption is significantly enhanced in the range of 1,150–1,300 nm at a relatively thin photoactive ***,the thin photoactive layer facilitates efficient carrier ***,the PbS QD IR solar cells exhibit a highly efficient photoelectric conversion in the IR region,resulting in a high IR PCE of 1.3%which is comparable to the highest value of solution-processed IR solar cells based on PbSe *** results demonstrate that constructing an optical resonance cavity is a reasonable strategy for effective conversion of photons in the devices aiming at light in a relatively narrow wavelength range,such as IR solar cells and narrow band photodetectors.

关键词： infrared solar cells PbS quantum dots optical resonance carrier extraction