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Efficient degradation of aqueous dichloromethane by an enhanced microbial electrolysis cell:Degradation kinetics,microbial co.munity and metabolic mechanisms

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Journal of Environmental Sciences 2024年第5期139卷 150-159页

作者： Meng Wu Di Zhao Bing Gu ZiruWang Jun Hu Zhiliang Yu Jianming Yu co.lege of Environment College of Biotechnology and BioengineeringCollaborative Innovation Center of Yangtze River Delta Region Green PharmaceuticalsZhejiang University of TechnologyHangzhou 310014China Shentuo Environment(Hangzhou)co.Ltd. Hangzhou 311121China Zhejiang Tianyi Environmental co.Ltd. Hangzhou 310000China

Dichloromethane(DCM)has been listed as a toxic and harmful water pollutant,and its re moval needs attention.Microbial electrolysis cells(MECs)are viewed as a promising alterna tive for pollutant removal,which can be strengthened from two aspects:microbial inocula tion and acclimation.In this study,the MEC for DCM degradation was inoculated with the ac tive sludge enhanced by Methylobacterium rhodesianum H13(strain H13)and then acclimated in the form of a microbial fuel cell(MFC).Both the introduction of strain H13 and the initi ation in MFC form significantly promoted DCM degradation.The degradation kinetics were fitted by the Haldane model,with V_(max),K_(h),K_(i)and v_(max)values of 103.2 mg/L/hr,97.8 mg/L268.3 mg/L and 44.7 mg/L/hr/cm^(2),respectively.The cyclic voltammogram implies that DCM redox reactions became easier with the setup of MEC,and the electrochemical impedance spectrogram shows that the acclimated and enriched microbes reduced the charge transfe resistance from the electrode to the electrolyte.In the biofilm,the dominant genera shifted from Geobacter to Hyphomicrobium in acclimation stages.Moreover,Methylobacterium played an increasingly important role.DCM metabolism mainly occurred through the hydrolytic glutathione S-transferase pathway,given that the gene dcmA was identified rather than the dhlA and P450/MO.The exogenous electrons facilitated the reduction of GSSG,directly o indirectly accelerating the GSH-catalyzed dehalogenation.This study provides support fo the co.struction of an efficient and stable MEC for DCM removal in water environment.

关键词： Dichloromethane Microbial electrolysis cells Metabolic pathways Electron transfer Degradation kinetics

Reanalysis of energy band structure in the type-II quantum wells

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Chinese physics B 2024年第6期33卷 75-78页

作者：李欣欣邓震江洋杜春花贾海强王文新陈弘 Key Laboratory for Renewable Energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China center of Materials and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China The yangtze river delta physics research center Liyang 213000China Songshan Lake Materials Laboratory Dongguan 523808China

Band structure analysis holds significant importance for understanding the optoelectronic characteristics of semico.ductor structures and exploring their potential applications in practice. For quantum well structures, the energy of carriers in the well splits into discrete energy levels due to the co.finement of barriers in the growth direction. However, the discrete energy levels obtained at a fixed wave vector cannot accurately reflect the actual energy band structure. In this work, the band structure of the type-II quantum wells is reanalyzed. When the wave vectors of the entire Brillouin region(co.responding to the growth direction) are taken into acco.nt, the quantized energy levels of the carriers in the well are replaced by subbands with certain energy distributions. This new understanding of the energy bands of low-dimensional structures not only helps us to have a deeper co.nition of the structure, but also may overturn many viewpoints in traditional band theories and serve as supplementary to the band theory of low-dimensional systems.

关键词： energy band structure type-II quantum wells low-dimensional semico.ductors

co.doped BaFe_(2)As_(2) Josephson junction fabricated with a focused helium ion beam

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Chinese physics B 2024年第4期33卷 181-186页

作者：陈紫雯张焱马平徐中堂李宇龙王越路建明马衍伟甘子钊 Applied Superco.ductivity research center Peking UniversityBeijing 100871China State Key Laboratory for Artificial Microstructure and Mesosco.ic physics Peking UniversityBeijing 100871China Institute of co.densed Matter physics School of PhysicsPeking UniversityBeijing 100871China yangtze delta Institute of Optoelectronics Peking UniversityBeijing 100871China Key Laboratory of Applied Superco.ductivity Institute of Electrical EngineeringChinese Academy of SciencesBeijing 100190China

Josephson junction plays a key role not only in studying the basic physics of unco.ventional iron-based superco.ductors but also in realizing practical application of thin-film based devices,therefore the preparation of high-quality iron pnictide Josephson junctions is of great importance.In this work,we have successfully fabricated Josephson junctions from co.doped BaFe_(2)As_(2)thin films using a direct junction fabrication technique which utilizes high energy focused helium ion beam(FHIB).The electrical transport properties were investigated for junctions fabricated with various He^(+)irradiation doses.The junctions show sharp superco.ducting transition around 24 K with a narrow transition width of 2.5 K,and a dose co.related foot-structure resistance which co.responds to the effective tuning of junction properties by He^(+)irradiation.Significant J_c suppression by more than two orders of magnitude can be achieved by increasing the He^(+)irradiation dose,which is advantageous for the realization of low noise ion pnictide thin film devices.Clear Shapiro steps are observed under 10 GHz microwave irradiation.The above results demonstrate the successful fabrication of high quality and co.trollable co.doped BaFe_(2)As_(2)Josephson junction with high reproducibility using the FHIB technique,laying the foundation for future investigating the mechanism of iron-based superco.ductors,and also the further implementation in various superco.ducting electronic devices.

关键词： focused helium ion beam co.doped BaFe_(2)As_(2) Josephson junction

The safety aspect of sodium ion batteries for practical applications

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Journal of Energy Chemistry 2024年第8期95卷 407-427页

作者： Yingshuai Wang Runqing Ou Jingjing Yang Yuhang Xin Preetam Singh Feng Wu Yumin Qian Hongcai Gao School of Materials Science & Engineering Beijing Institute of Technology Department of Ceramic Engineering Indian Institute of Technology(Banaras Hindu University) Varanasi School of physics Beijing Institute of Technology yangtze delta Region Academy of Beijing Institute of Technology Beijing Institute of Technology Chongqing Innovation center

Sodium-ion batteries(SIBs) with advantages of abundant resource and low co.t have emerged as promising candidates for the next-generation energy storage systems. However, safety issues existing in electrolytes, anodes, and cathodes bring about frequent accidents regarding battery fires and explosions and impede the development of high-performance SIBs. Therefore, safety analysis and high-safety battery design have beco.e prerequisites for the development of advanced energy storage systems. The reported reviews that only focus on a specific issue are difficult to provide overall guidance for building high-safety SIBs. To overco.e the limitation, this review summarizes the recent research progress from the perspective of key co.ponents of SIBs for the first time and evaluates the characteristics of various improvement strategies. By orderly analyzing the root causes of safety problems associated with different co.ponents in SIBs(including electrolytes, anodes, and cathodes), co.responding improvement strategies for each co.ponent were discussed systematically. In addition, some noteworthy points and perspectives including the chain reaction between security issues and the selection of improvement strategies tailored to different needs have also been proposed. In brief, this review is designed to deepen our understanding of the SIBs safety issues and provide guidance and assistance for designing high-safety SIBs.

关键词： Anode bulk modification Cathode bulk design Organic electrolytes modification Safety Sodium ion batteries Solid-state electrolyte

Reflective ultrathin light-sheet microsco.y with isotropic 3D resolutions

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Photonics research 2024年第2期12卷 271-281页

作者： YUE WANG DASHAN DONG WENKAI YANG RENXI HE MING LEI KEBIN SHI State Key Laboratory for Mesosco.ic physics Department of PhysicsPeking UniversityBeijing 100871China State Key Laboratory of Membrane Biology School of Life Sciencesand Biomedical Pioneering Innovation Center(BIOPIC)Peking UniversityBeijing 100871China School of physics Xi’an Jiaotong UniversityXi’an 710049China co.laborative Innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China Peking University yangtze delta Institute of Optoelectronics Nantong 226010China

Light-sheet fluorescence microsco.y(LSFM)has played an important role in bio-imaging due to its advantages of high photon efficiency,fast speed,and long-term imaging capabilities.The perpendicular layout between LSFM excitation and detection often limits the 3D resolutions as well as their isotropy.Here,we report on a reflective type light-sheet microsco.e with a mini-prism used as an optical path reflector.The co.ventional high NA objectives can be used both in excitation and detection with this design.Isotropic resolutions in 3D down to300 nm co.ld be achieved without deco.volution.The proposed method also enables easy transform of a co.ventional fluorescence microsco.e to high performance light-sheet microsco.y.

关键词： resolution excitation light

Capturing the non-equilibrium state in light–matter–free-electron interactions through ultrafast transmission electron microsco.y

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Chinese physics B 2024年第1期33卷 88-101页

作者：汪文韬孙帅帅李俊郑丁国黄思远田焕芳杨槐馨李建奇 Beijing National Laboratory for co.densed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China yangtze river delta physics research center co. Ltd.LiyangJiangsu 213300China

Ultrafast transmission electron microsco.e(UTEM) with the multimodality of time-resolved diffraction, imaging,and spectrosco.y provides a unique platform to reveal the fundamental features associated with the interaction between free electrons and matter. In this review, we summarize the principles, instrumentation, and recent developments of the UTEM and its applications in capturing dynamic processes and non-equilibrium transient states. The co.bination of the transmission electron microsco.e with a femtoseco.d laser via the pump–probe method guarantees the high spatiotemporal resolution, allowing the investigation of the transient process in real, reciprocal and energy spaces. Ultrafast structural dynamics can be studied by diffraction and imaging methods, revealing the co.erent aco.stic phonon generation and photoinduced phase transition process. In the energy dimension, time-resolved electron energy-loss spectrosco.y enables the examination of the intrinsic electronic dynamics of materials, while the photon-induced near-field electron microsco.y extends the application of the UTEM to the imaging of optical near fields with high real-space resolution. It is noted that light–free-electron interactions have the ability to shape electron wave packets in both longitudinal and transverse directions, showing the potential application in the generation of attoseco.d electron pulses and vortex electron beams.

关键词： ultrafast transmission electron microsco.y non-equilibrium structural dynamics photo-induced phase transition free-electron–photon interactions

Spin‑co.trolled topological phase transition in non‑Euclidean space

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Frontiers of Optoelectronics 2024年第1期17卷 67-76页

作者： Zhuochen Du Jinze Gao Qiuchen Yan Cuicui Lu Xiaoyong Hu Qihuang Gong State Key Laboratory for Mesosco.ic physics and Department of physics Collaborative Innovation Center of Quantum Matter and Frontiers Science Center for Nano‑OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China Peking University yangtze delta Institute of Optoelectronics Nantong 226010China co.laborative Innovation center of Extreme Optics Shanxi UniversityTaiyuan 030006China Hefei National Laboratory Hefei 230088China

Modulation of topological phase transition has been pursued by researchers in both co.densed matter and optics research fields,and has been realized in Euclidean systems,such as topological photonic crystals,topological metamaterials,and co.pled resonator arrays.However,the spin-co.trolled topological phase transition in non-Euclidean space has not yet been explored.Here,we propose a non-Euclidean co.figuration based on Mobius rings,and we demonstrate the spin-co.trolled transition between the topological edge state and the bulk state.The Mobius ring,which is designed to have an 8πperiod,has a square cross section at the twist beginning and the length/width evolves adiabatically along the loop,acco.panied by co.version from transverse electric to transverse magnetic modes resulting from the spin-locked effect.The 8πperiod Mobius rings are used to co.struct Su–Schrieffer–Heeger co.figuration,and the co.figuration can support the topological edge states excited by circularly polarized light,and meanwhile a transition from the topological edge state to the bulk state can be realized by co.trolling circular polarization.In addition,the spin-co.trolled topological phase transition in non-Euclidean space is feasible for both Hermitian and non-Hermitian cases in 2D systems.This work provides a new degree of polarization to co.trol topological photonic states based on the spin of Mobius rings and opens a way to tune the topological phase in non-Euclidean space.

关键词： Topological phase transition Non-Euclidean space Möbius ring Spin-locked effect

Tunable artificial plasmonic nanolaser with wide spectrum emission operating at room temperature

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Chinese physics B 2024年第5期33卷 466-471页

作者：周鹏郭佳琦梁琨金磊梁熊玉李俊强邓绪彦秦建宇张家森于丽 State Key Laboratory of Information Photonics and Optical co.munications School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory for Artificial Microstructures and Mesosco.ic physics School of PhysicsPeking UniversityBeijing 100876China Peking University yangtze delta Institute of Optoelectronics Peking UniversityNantong 226010China

With the rapid development of information and co.munication technology,a key objective in the field of optoelectronic integrated devices is to reduce the nano-laser size and energy co.sumption.Photonics nanolasers are unable to exceed the diffraction limit and typically exhibit low modulation rates of several GHz.In co.trast,plasmonic nanolaser utilizes highly co.fined surface plasmon polariton(SPP)mode that can exceed diffraction limit and their strong Purcell effect can accelerate the modulation rates to several THz.Herein,we propose a parametrically tunable artificial plasmonic nanolasers based on metal–insulator–semico.ductor–insulator–metal(MISIM)structure,which demonstrates its ability to co.press the mode field volume toλ/14.As the pump power increases,the proposed artificial plasmonic nanolaser exhibits 20-nm-wide output spectrum.Additionally,we investigate the effects of various cavity parameters on the nanolaser’s output threshold,offering potentials for realizing low-threshold artificial plasmonic nanolasers.Moreover,we observe a blue shift in the center wavelength of the nanolaser output with thinner gain layer thickness,predominantly attributed to the increased exciton–photon co.pling strength.Our work brings inspiration to several areas,including spaser-based interco.nects,nano-LEDs,spontaneous emission co.trol,miniaturization of photon co.densates,eigenmode engineering of plasmonic nanolasers,and optimal design driven by artificial intelligence(AI).

关键词： surface plasmon polaritons nanolaser ultrafast MISIM

Indium-based electrocatalysts for co.(2) reduction to C1 products

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Chinese Chemical Letters 2024年第6期35卷 134-145页

作者： Qin Cheng Ming Huang Qingqing Ye Bangwei Deng Fan Dong research center for Carbon-Neutral Environmental&Energy Technology Institute of Fundamental and Frontier SciencesUniversity of Electronic Science and Technology of ChinaChengdu 611731China yangtze delta Region Institute(Huzhou)&Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaHuzhou 313000China Suzhou Industrial Technology research Institute of Zhejiang University Suzhou 215163China

Electrocatalytic co.(2) reduction at mild co.ditions is a promising strategy to transform greenhouse gases into fuels or value-added chemicals to solve the increasingly serious environmental and energy problems.The most crucial factor in determining the co.(2) reduction performance is to develop efficient electrocatalysts with high selectivity and stability.Among the various electrocatalysts,indium-based catalysts have attracted extensive attention due to their non-toxicity,low co.t,and high formic acid/formate selectivity.In this work,we co.prehensively review the recent development and research progress of indium-based electrocatalysts for co.(2)RR.The reaction mechanism,reaction pathways,structure-activity relationship,and strategies to enhance the activity of co.(2)RR on indium-based catalysts have also been briefly presented and discussed.Finally,the existing challenges and future developments for indium-based highperformance catalysts for co.(2)RR are proposed.

关键词： Electrocatalytic co.(2)reduction In-based catalysts Formate Reaction mechanism Structure-activity relationship