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FeCl₃-Catalyzed Multifunctional LMCT and HAT for Synthesis of Benzo[c]Coumarins from 2-Methyl-1,1′-Biaryls at Ambient Temperature

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ChemCatChem 2025年

作者： Wang, Hui-Lin Niu, Wen-Ting Zhang, Wen-Min Shi, Meng-Xin Li, Yang Frontier Institute of Science and Technology and State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 712064 China

In this study, we report FeCl3-catalyzed multifunctional ligand-to-metal charge transfer (LMCT) and hydrogen atom transfer (HAT) for the synthesis of benzo[c]coumarins from 2-methyl-1,1′-biaryls. This catalytic syste... 详细信息

In this study, we report FeCl₃-catalyzed multifunctional ligand-to-metal charge transfer (LMCT) and hydrogen atom transfer (HAT) for the synthesis of benzo[c]coumarins from 2-methyl-1,1′-biaryls. This catalytic system is straightforward, only using FeCl₃·6H₂O as the catalyst and air as the oxidant under visible-light irradiation at ambient temperature. Mechanistic studies indicate that multifunctional LMCT and HAT processes generate chlorine radicals and aryl carboxyl radicals, which are key active species that facilitate the smooth transformation. © 2025 Wiley-VCH GmbH.

关键词： Aryl carboxyl radical Benzo[c]coumarins Chlorine radical Iron photocatalysis Multifunctional LMCT and HAT

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Functional expression of proton pumps in Rhodobacter sphaeroides enhanced energy supply and photo-fermentative hydrogen production

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Bioresource Technology 2025年 432卷 132666页

作者： Mu, Xuefang Xu, Yuntong Ma, Yu Gao, Zixuan Feng, Jiali Wang, Minmin Cao, Wen Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Rood Xi'an710049 China College of Biology and Oceanography Weifang University Shandong Weifang261061 China

Photo-fermentative hydrogen production by Rhodobacter sphaeroides (R. sphaeroides) is an energy-consuming process. In this study, a proton-pumping channel (Proteorhodopsin (PR) or Gloeobacter rhodopsin (GR)) was introduced into R. sphaeroides HY01. The results indicated that PR could enhance the biomass of the strain during periods of resource scarcity. The cumulative hydrogen yield of mutant strains (HY01-PR and HY01-GR) increased by 66 % and 75 % compared with HY01 when glucose was fed, respectively. Notably, HY01-GR demonstrated tolerance to high acetate concentrations (93 mM). Moreover, the introduction of proton-pump resulted in a reduction of catabolism carbon flow and the accumulation of various metabolites. This study also confirmed that proton pump overexpression generated more ATP in the late stages of fermentation by coupling ATP synthase. Overall, these findings suggest that proton pumps could potentially be applied to photosynthetic organisms to regulate growth metabolism and enhance the production of valuable compounds. © 2025 Elsevier Ltd

关键词： Metabolites

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Proposal and performance analysis on thermal energy storage systems with live and reheat steam as heat sources to co-enhance the operational flexibility and efficiency of coal-fired power plants

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Journal of Energy Storage 2025年 127卷

作者： Yang, Shuokang Liu, Ming Zhang, Kezhen Liu, Miaomiao Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Xi'an Thermal Power Research Institute Co. Ltd. Xi'an710054 China

The high penetration of intermittent renewable power threatens the steady operation of the power grid, and the operational flexibility of schedulable power plants should be enhanced. Thermal energy storage (TES) emerges as a promising technique to enhance the operational flexibility of coal-fired power plants (CFPPs). In this study, molten salt thermal storage systems utilizing live and reheat steam as heat sources were proposed, and the steam ejectors were integrated to recover the residual pressure of exhausted steam from the TES system to co-enhance the operational flexibility and energy efficiency of coal-fired power plants. Two TES system schemes, i.e., the scheme D1 storing medium-temperature heat to heat feedwater afterwards, and the scheme D2 storing high-temperature heat to generate steam afterwards, were designed. Then, simulation models were developed, and performance indicators were defined. Results indicate that the operational flexibility of the coal-fired power plant can be enhanced by the integration of the TES system, and the adjustable minimum load ratio can be decreased from 30 % to 17.71 % and 17.83 % for the schemes D1 and D2, respectively. When the steam ejectors are integrated, the equivalent round-trip efficiency can be increased by 1.60 % and 2.43 % for schemes D1 and D2, respectively. The scheme D2 shows a higher equivalent round-trip efficiency of 46.69 %, surpassing the scheme D1. © 2025 Elsevier Ltd

关键词： Fossil fuel power plants

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Confinement Effect Enhanced Ultra-Low Temperature Tolerance in Organo-Hydrogels with High Electrical Conductivities for Soft Electronics

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Advanced Functional Materials 2025年

作者： Wang, Jing Yao, Yanqiu Hao, Xin Pan, Jiahao Zhuang, Tiantian Guo, Liejin Wang, Hong State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710054 China School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710054 China

Conducting organo-hydrogels is promising for soft electronics applications. However, conventional organo-hydrogels typically exhibit low electrical conductivity (−1) at subzero temperatures (←20 °C), severe... 详细信息

Conducting organo-hydrogels is promising for soft electronics applications. However, conventional organo-hydrogels typically exhibit low electrical conductivity (<5 S cm⁻¹) at subzero temperatures (←20 °C), severely limiting their utility in low-temperature soft electronics. In this work, a PEDOT:PSS-based all-polymer organo-hydrogel are developed with ultralow-temperature tolerance down to −90 °C and record high electrical conductivity up to 698.3 ± 37.3 S cm⁻¹. The high electrical conductivity is due to a developed preparation method and the ultra-low temperature tolerance property is attributed to the suppression of the coagulation of the organo-hydrogel with alcohols as well as the confinement effects of the porous structure existing in the hydrogel films. The obtained highly conductive organo-hydrogel films exhibit high performance in thermoelectrics, electromagnetic interference shielding, and stretchable strain sensors in subzero temperatures. A thermal driven grabber has been fabricated to demonstrate the good flexibility, the good strain–stress property, and the good Joule-heating ability of the conducting organo-hydrogels at low temperatures. This work extends the operational temperature limits of organo-hydrogel electronics to extreme cold environments (>−90 °C). © 2025 Wiley-VCH GmbH.

关键词： air-stable all polymer organo-hydrogels high electrical conductivity PEDOT:PSS ultra-low temperature tolerance

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Decoupling the heating and reduction processes in solar-driven two-step thermochemical cycle by coupling it with thermal power generation

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Energy 2025年 324卷

作者： Zhu, Liya Mao, Jinxin Du, Jinyang Han, Fengshuang Zhao, Kai Lu, Youjun School of Electrical Engineering Zhengzhou University Zhengzhou450001 China School of Energy and Power Engineering North China University of Water Resources and Electric Power Zhengzhou450001 China School of Mechanical and Power Engineering Zhengzhou University Zhengzhou450001 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Solar-driven H2O/CO2 splitting via two-step thermochemical cycle is a promising path for renewable fuel production. However, the energy losses caused by the high solar thermal temperature and the significant technical challenges in oxygen carrier heat recovery have long hindered its efficiency improvement. In this work, the two-step cycle was proposed to couple with a thermal power generation process to recover the process heat, and the electricity generated was proposed to be used in the reduction step, for which the solar heating and reduction processes can be decoupled. Thermodynamic evaluation shows that an efficiency advantage over the traditional cycling mode can be expected even when the solar thermal temperature is 50 K lower. It is 16.1 % at Tred = 1773 K and Tsolar = 1723 K, significantly higher than that of the traditional cycle working at Tred = 1773 K with 95 % gas heat and 40 % solid heat recovered (13.6 %). The novel cycling mode not only provides a practical heat recovery strategy, but also creates a completely new space for further lowering the solar thermal temperature and brings about obvious engineering advantages. It is supposed to be of important implications in promoting the practical application of the technology. © 2025

关键词： Solar heating

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Evaporation of sub-millimeter flying dinitrogen tetroxide droplet under high temperature and pressure: Experimental measurement and theoretical modeling

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Chinese Journal of Aeronautics 2025年第05期 82-93页

作者： Lihan FEI Wu ZHU Yuyuan ZHANG Peng ZHANG Zuohua HUANG Chenglong TANG State Key Laboratory of Multiphase Flow and Power Engineering Xi'an Jiaotong University Department of Mechanical Engineering City University of Hong Kong

The evaporation behaviors are crucial for the flame location estimation in liquid rocketengines. This work, for the first time, experimentally reports the sub-millimeter droplet evaporationcharacteristics of the corrosive dinitrogen tetroxide（NTO, one prevailing hypergolic oxidizer） athigh ambient pressure up to 4.5 MPa. An in-house corrosion-resistant droplet generator is usedto generate isolated flying droplets of sub-millimeter size, which are then exposed in a gas environ-ment with temperatures between 1 010 K and 1 210 K and pressures in the range between 2.0 MPaand 4.5 MPa, provided by an optical rapid compression machine. Parallelly, a theoretical modelconsidering both the droplet ambient convection and the NTO dissociation is developed. Resultsindicate that firstly, the present theoretical model that considers the transient droplet-ambient con-vection as well as the temperature and pressure dependent rate of dissociation shows good agree-ment with the experimentally observed droplet lifetime. In addition, the flying droplets velocityregress gradually due to momentum exchange with the ambient, which is more prominent at higherpressure. The evaporation caused droplet size reduction is consistent with the classical D2-law pre-diction, in the present temperature and pressure range. Finally, higher temperature and pressureaccelerate the evaporation and an empirical correlation for the temperature and pressure dependentevaporation rate constant is proposed, which shows good agreement with experiment and simula-tion results.

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Pilot-Scale Photoreforming of Hydrolyzed Polylactic Acid Waste to High-Value Chemicals and H2 via Atomic Ru Integration

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Advanced Energy Materials 2025年第0期

作者： Liu, Feng Zhang, Chunyang Lu, Kejian Yan, Xueli Wang, Yi Jing, Dengwei Guo, Liejin Liu, Maochang International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China Suzhou Academy of Xi'an Jiaotong University Jiangsu Suzhou215123 China

Photoreforming of polylactic acid (PLA) waste into valuable chemicals offers a promising approach for environmental protection and waste valorization, yet faces challenges of low yields and harsh conditions. Herein, a Cd0.5Zn0.5S nanotwin catalyst decorated with Ru single atoms and clusters is reported, enabling selective photoreforming of PLA into pyruvic acid (PA) and H2. It is demonstrated that Ru single atoms favor PA formation via hydroxyl dissociation, while the further incorporation of Ru clusters serve as active sites for H2 production. This synergistic effect significantly enhances photocatalytic performance, achieving 96.8% PA selectivity and efficient H2 production with a record-breaking apparent quantum efficiency of 83.7% at 400 nm. This approach is scalable for outdoor processes, utilizing direct 1 m2 sunlight irradiation to deliver ≈1191 mL h−1 of H2 and 47.27 mmol h−1 of PA from PLA waste, paving a viable pathway for large-scale simultaneous production of high-value chemicals and H2. © 2025 Wiley-VCH GmbH.

关键词： Photolysis

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Efficient conversion of CO2 to CH4 through supercritical water gasification of plastic with calcium looping

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Renewable Energy 2025年 249卷

作者： Li, Xuantong Wu, Hongtu Wang, Weizuo Wang, Junying Wu, Chunfei Jin, Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an710049 China School of Chemistry and Chemical Engineering Queen's University Belfast BelfastBT9 6FS United Kingdom

Calcium looping (CaL) is a promising technology with significant implications for carbon capture. However, the traditional CaL requires a high temperature of 950 °C for CaCO3 decomposition, posing challenges for further development due to stringent temperature conditions. This study leverages the advantages of a hydrogen-rich reaction environment in a supercritical water gasification (SCWG) system to develop a thermodynamic model of a solar-driven SCWG system incorporating CaL. This innovation reduces the high-temperature requirement of traditional CaL by 41 %, lowering it to 560 °C, and simultaneously alleviates the coupling difficulty of solar-driven systems. The system utilises waste carbide slag (CS) to convert waste plastics into combustible CH4 and other industrial products, achieving thermochemical elimination of CO2 into CH4. Results indicate that CH4 production in traditional gasification systems increases with temperature, whereas the inclusion of CaL shows a trend of initial increase followed by a decrease, peaking at 560 °C with a 19.12 % increase compared to systems without CaL. Both energy and exergy efficiencies decline with temperature, while the impact of pressure on gasification performance and system efficiency remains below 10 %. Increasing the plastic-to-water ratio enhances CH4 production and energy and exergy efficiencies but reduces the gas yield per unit of plastic. © 2025

关键词： Exergy

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Numerical Study of Multi-Factor Coupling Effects on Energy Conversion Performance of Nanofluidic Reverse Electrodialysis

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Frontiers in Heat and Mass Transfer 2025年第2期23卷 507-528页

作者： Hao Li Cunlu Zhao Jinhui Zhou Jun Zhang Hui Wang Yanmei Jiao Yugang Zhao School of Physical and Mathematical Sciences Nanjing Tech UniversityNanjing211816China MOE Key Laboratory of Thermo-Fluid Science and Engineering Xi’an Jiaotong UniversityXi’an710049China Key Laboratory of Unsteady Aerodynamics and Flow Control Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing210016China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai200093China Key Laboratory of Icing and Anti/De-icing China Aerodynamics Research and Development CenterMianyang621000China

Based on the rapid advancements in nanomaterials and nanotechnology,the Nanofluidic Reverse Electrodialysis(NRED)has attracted significant attention as an innovative and promising energy conversion strategy for extracting sustainable and clean energy fromthe salinity gradient ***,the scarcity of research investigating the intricate multi-factor coupling effects on the energy conversion performance,especially the trade-offs between ion selectivity and mass transfer in nanochannels,of NRED poses a great challenge to achieving breakthroughs in energy conversion *** numerical study innovatively investigates the multi-factor coupling effect of three critical operational factors,including the nanochannel configuration,the temperature field,and the concentration difference,on the energy conversion processes of *** this work,a dimensionless amplitude parameter s is introduced to emulate the randomly varied wall configuration of nanochannels that inherently occur in practical applications,thereby enhancing the realism and applicability of our *** results reveal that the application of a temperature gradient,which is oriented in opposition to the concentration gradient,enhances the ion transportation and selectivity simultaneously,leading to an enhancement in both output power and energy conversion ***,the increased fluctuation of the nanochannel wall from s=0 to s=0.08 improves ion selectivity yet raises ion transport resistance,resulting in an enhancement in output power and energy conversion efficiency but a slight reduction in ***,with increasing the concentration ratio cH/cL from 10 to 1000,either within a fixed temperature field or at a constant dimensionless amplitude,the maximumpower consistently attains its optimal value at a concentration ratio of 100 but the cation transfer number experiences amonotonic decrease across this entire range of concentration ***,uponmodifying the ope

关键词： Salinity gradient energy nanofluidic reverse electrodialysis energy conversion nanochannel configuration multi-factor coupling effect

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Temperature dependence photoluminescence properties of ZnSe-based core-shell quantum dots

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Optics Express 2025年第11期33卷 22588-22597页

作者： Tingting Zhang Qing Ma Qingping Li Lanting Huang Yuqiong Feng Hongwei Duan Xinlei Chen Qinghua Li Xiao Jin Jinke Bai Bing Xu Key Laboratory of Environmentally Friendly Functional Materials and Devices School of Physics Science and Technology Lingnan Normal University Zhanjiang Guangdong 524048 China School of Energy and Power Engineering / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai 200093 China Department of Materials and Chemical Engineering Taiyuan University Taiyuan 030032 China baijinke526@*** xubing@***

Heavy metal-free ZnSe-based core-shell quantum dots (QDs) are promising emitting material for achieving violet-blue luminescence. Investigating the temperature-dependent variations in the photoluminescence (PL) properties of ZnSe-based QDs will enhance our understanding of the intrinsic factors that influence their diverse luminescence characteristics. Here we select the optimally synthesized ZnSe core QDs with three diameters (4.1, 5.2, and 8.3 nm) and ZnSe/ZnS core-shell QDs to study their temperature-dependent photoluminescence properties. As the sample temperature is increased, the PL intensity decreases, the emission energy redshifts, and the spectral become broader. We observe a reduction in the exciton- longitudinal optical (LO)-phonon coupling constant from 21.7 meV to 16.1 meV as the diameter of ZnSe core QDs increased from 4.1 nm to 8.3 nm. This decrease is associated with a narrower homogeneous broadening of the emission spectrum. Besides, the epitaxial growth of a ZnS wide bandgap shells onto the ZnSe core QDs can effectively isolate the photogenerated excitons away from the inorganic-organic interface, thus reducing the PL peak width and increasing the exciton binding energy of the QDs. Our research provides a valuable addition to the existing studies on the photoluminescence properties of ZnSe-based core-shell QDs.

关键词： Light sources Photoluminescence Photometry Quantum confinement Quantum dots Zinc selenide

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