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Persistence of charge density wave against variation of band structures in V_(x)Ti_(1−x)Se_(2)(x=0–0.1)

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Nano Research 2024年第3期17卷 2129-2135页

作者： Zhanfeng Liu Tongrui Li Wen Zhu Hongwei Shou Mukhtar Lawan Adam Qilong Cui Yuliang Li Sheng Wang Yunbo Wu Hongen Zhu Yi Liu Shuangming Chen Xiaojun Wu Shengtao Cui Li Song Zhe Sun National Synchrotron Radiation laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China cas key laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of advanced Microstructures Nanjing 210093China State key laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China School of Chemistry and Materials Sciences CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China School Zhejiang Institute of Photonelectronics Jinhua 321004China

Charge density wave(CDW)is a phenomenon that occurs in materials,accompanied by changes in their intrinsic electronic *** study of CDW and its modulation in materials holds tremendous significance in materials research,as it provides a unique approach to controlling the electronic properties of ***_(2) is a typical layered material with a CDW phase at low *** V substitution for Ti in TiSe_(2),we tuned the carrier concentration in V_(x)Ti_(1-x)Se_(2) to study how its electronic structures ***-resolved photoemission spectroscopy(ARPES)shows that the band-folding effect is sustained with the doping level up to 10%,indicating the persistence of the CDW phase,even though the band structure is strikingly different from that of the parent compound TiSe_(2).Though CDW can induce the band fold effect with a driving force from the perspective of electronic systems,our studies suggest that this behavior could be maintained by lattice distortion of the CDW phase,even if band structures deviate from the electron-driven CDW *** work provides a constraint for understanding the CDW mechanism in TiSe_(2),and highlights the role of lattice distortion in the band-folding effect.

关键词： charge density wave band structure lattice distortion

Introducing sulfur to nickel-iron selenide for high-efficiency alkaline seawater electrolysis

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Science China Chemistry 2024年第8期67卷 2747-2754页

作者： Xuanwa Chen Yanhui Yu Xingqi Han Huan Wang Yingjie Hua Daoxiong Wu Peilin Deng Juanxiu Xiao Xinlong Tian Jing Li School of Marine Science and Engineering Hainan Provincial Key Lab of Fine ChemistrySchool of Chemistry and Chemical EngineeringHainan UniversityHaikou 570228China key laboratory of advanced energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China key laboratory of Electrochemical energy Storage and energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou 571158China

Seawater electrolysis is an effective way to obtain hydrogen(H_(2))in a sustainable ***,the lack of electrocatalysts with high activity,stability,and selectivity for oxygen evolution reaction(OER)severely hinders the development of seawater electrolysis ***,sulfur-doped nickel-iron selenide nanosheets(S-NiFeSe_(2))were prepared by an ion-exchange strategy and served as highly active OER electrocatalyst for alkaline seawater *** overpotential is 367 m V,and it can run stably for over 50 h at 100 m A cm^(-2).Excitingly,the S-NiFeSe_(2)||Pt/C pair exhibits cell voltage of 1.54 V at 10 m A cm^(-2)under alkaline seawater conditions,which can run smoothly for 100 h without decay,and the efficiency of electricity-tohydrogen(ETH)energy conversion reaches more than 80%.Such electrode,with abundant accessible reactive sites and good corrosion resistance,is a good candidate for seawater ***,density functional theory calculations reveal that the surface sulfur atoms can activate the adjacent Ni sites and decrease the free energy changes of the associated intermediates at the adjacent Ni sites for OER,and the step of~*OH→~*O is the potential rate-limiting *** this work,the true reactive site in nickel-iron selenides is the Ni sites,but not the Fe sites as commonly believed.

关键词： S-doping nickel-iron selenide electrocatalysts oxygen evolution reaction alkaline seawater electrolysis

Comprehensive kinetic study on ammonia/ethylene counter-flow diffusion flames:influences of diluents

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International Journal of Coal Science & Technology 2024年第1期11卷 232-249页

作者： Zhimei Shu Tingting Xu Jiayi Xiao Qige Deng Xuan Zhao Tianjiao Li Yaoyao Ying Dong Liu MIIT key laboratory of Thermal Control of Electronic Equipment School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing210094China advanced Combustion laboratory School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing210094China

This study aimed to investigate the effects of ammonia addition on ethylene counter-flow diffusion flames with different diluents on the fuel or oxidizer side,using kinetic analyses.A special emphasis was put on assessing the coupled chemical effects of NH_(3) and CO_(2) on C2H4 combustion *** chemical effects could be evaluated by comparing fictitious inert NH_(3) or CO_(2) with normal active NH_(3) or CO_(2).The results revealed that the addition of NH_(3) decreased the mole fractions and production rates of key soot precursors,such as acetylene,propynyl,and *** CO_(2) was used as the dilution gas,the coupled chemical effects of NH_(3) and CO_(2) were affected by the chemical effects of CO_(2) to varying *** the oxidizer-side CO_(2) addition,the coupled chemical effects of NH_(3) and CO_(2) reduced the mole fractions of H,O,OH radicals,acetylene,propynyl,and benzene,while the effects differed from the fuel-side CO_(2) *** coupled chemical effects of NH_(3) and CO_(2) also promoted the formation of aldehyde contaminants,such as acetaldehyde,to some extent,particularly with CO_(2) addition on the oxidizer side.

关键词： Ammonia addition Diluents Coupled chemical effects Kinetic analysis

Spray characteristics of different regions downstream of a swirl cup

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Chinese Journal of Aeronautics 2024年第8期37卷 124-143页

作者： Donghui WANG Yong HUANG Hongzhou ZHANG Collaborative Innovation Center of advanced Aero-Engine School of Energy and Power EngineeringBeihang UniversityBeijing 102206China National key laboratory of Science and Technology School of Energy and Power EngineeringBeihang UniversityBeijing 102206China

The spray characteristics of different regions downstream of swirl cups play a critical role in cold start and re-ignition of gas *** spray measurements were performed at the fuel pressures of 0.5,0.8,1.0,1.5,and 2.0 MPa and the fuel temperatures of-23,-13,-3,7,17 and 27℃,*** droplet size,droplet velocity,droplet number,and instantaneous spatial spray image of sprays from an aviation kerosene Jet-A were measured using a two-component phase Doppler particle analyzer and a digital off-axis holography *** the fuel pressure and temperature increase,the Sauter Mean Diameter(SMD)and spray non-uniformity of the Spray Shear Layer(SSL)gradually *** the fuel pressure increases,the SMD and spray non-uniformity of the Central Toroidal Recirculation Zone(CTRZ)gradually decrease,and the slopes of these curves both *** the fuel pressure increases,the SMD and spray nonuniformity of the CTRZ rapidly decrease at the fuel temperature of23℃,while slightly decrease at the fuel temperature of 27℃.The droplets in the CTRZ come from 3 different sources:simplex nozzle,venturi,and outside the *** the fuel pressure increases,the proportion of droplets recirculated from outside the CTRZ *** study proposed the concept of the“pressure critical point”for the swirl *** the fuel temperature decreases,the proportion of droplets recirculated from outside the CTRZ increases below the critical pressure,while decreases above the critical *** addition,through the models of liquid film formation and breakup on the curved cylindrical wall,a semi-theoretical model was established to predict the SMD of SSL for swirl *** prediction uncertainty of this model is less than 6%for all 14 conditions in this paper.

关键词： Swirl cup Sauter Mean Diameter(SMD) Spray non-uniformity Atomizing regions Semi-theoretical prediction Spray nozzles

In-situ defect passivation assisted three-step printing of efficient and stable formamidine-lead bromide solar cells

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Journal of energy Chemistry 2024年第9期96卷 396-405页

作者： Hang Yang Tao Zhou Haoyu Cai Wenjian Shen Hao Chen Yongjun Liu Juan Zhao Yi-Bing Cheng Jie Zhong State key laboratory of advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Foshan Xianhu laboratory of the advanced energy Science and Technology Guangdong laboratory Foshan 528216GuangdongChina School of Automobile Engineering Wuhan University of TechnologyWuhan 430070HubeiChina

Perovskite solar cells(PSCs)emerge as the most promising photovoltaics(PV)for their high performance and potential convenient cost-effective production routes comparing to the sophomore PV *** printed PSCs with simplified device architecture and fabrication procedures could further enhance the competitive strength of PSC *** this work,we present an in-situ defect passivation(ISDP)assisted full-printing of high performance formamidine-lead bromide(FAPbBr_(3))*** three rapid printing steps are involved for electron transporting layer(ETL),perovskite and carbon to form a complete solar cell on the low-cost fluorine-doped tin oxide(FTO)***-chain polymer monomethyl ether polyethylene glycol is particularly utilized as the ISDP passivator,leading to conformal coating on the rough FTO and defect passivation for both ETL and perovskite during printing.A high efficiency of 10.85%(certified 10.14%)and a high V_(oc)up to 1.57 V are achieved for the printed *** unencapsulated PSCs maintain above 90%of the initial efficiency after continuously heating at 85℃for 1000 h and over 80%of the efficiency after the maximum power point tracking for 3500 *** fully printed semitransparent PSCs with carbon grids(CGs)show average visible light transmittance over 33%and an efficiency of 8.81%.

关键词： Formamidinium lead bromide Fully printed Lowcosts Carbon electrode Semitransparent

Advancing electrochemical drilling process via coupling of flow field and electric field in pulsating state generated by a novel tube tool

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Chinese Journal of Aeronautics 2024年第4期37卷 542-555页

作者： Liang CHENG Xiaolei CHEN Zhisen YE Yongjun ZHANG State key laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006China Guangdong key laboratory of advanced Manufacturing Technology of Marine energy Equipment Guangdong University of TechnologyGuangzhou 510006China Guangzhou key laboratory of Nontraditional Machining and Equipment Guangdong University of TechnologyGuangzhou 510006China

This paper introduces an improvement to electrochemical drilling process by coupling flow field and electric field in pulsating state. A novel tube with half-wedged shape at the end(HW-tube) is prepared, with both sidewall and wedged part of the HW-tube insulated. Only the flat part is utilized to provide electric field for electrochemical drilling. By rotating the HW-tube, both flow field and electric field in pulsating state are generated, alternating in different positions within the inter-electrode gap(IEG). The pulsating flow field enhances the mass transfer process, while pulsating electric field disperses material dissolution process and distribution of electrolytic byproducts. Both pulsating fields are coupled at the same frequency, further enhancing the electrochemical drilling process. Simulation results indicate that both flow field and electric field in pulsating state are generated. Compared to the traditional tube, the HW-tube significantly reduces the number of residual particles in IEG, and this number is further reduced by increasing the rotation speed. Experimental results reveal that the surface quality and dimensional uniformity of small hole are improved with HW-tube. With feed rate of 2.22 mm/min, a small hole with diameter of 1.52± 0.017 mm is drilled, resulting in a surface roughness of 0.331 μm.

关键词： Small holes Electrochemical drilling Tools Pulsating flow field Pulsating electric field

High performance photodetector based on few-layer MoTe_(2)/CdS_(0.42)Se_(0.58) flake heterojunction

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Frontiers of physics 2024年第4期19卷 91-101页

作者： Ran Ma Qiuhong Tan Peizhi Yang Yingkai Liu Qianjin Wang College of Physics and Electronic Information Yunnan Normal UniversityKunming 650500China Yunnan Provincial key laboratory for Photoelectric Information Technology Yunnan Normal UniversityKunming 650500China key laboratory of advanced Technique&Preparation for renewable energy Materials Ministry of EducationYunnan Normal UniversityKunming 650500China

Two-dimensional(2D)transition metal dichalcogenides have been extensively studied due to their fascinating physical properties for constructing high-performance ***,their relatively low responsivities,current on/off ratios and response speeds have hindered their widespread ***,we fabricated a high-performance photodetector based on few-layer MoTe_(2) and CdS_(0.42)Se_(0.58) flake *** photodetector exhibited a high responsivity of 7221 A/W,a large current on/off ratio of 1.73×10^(4),a fast response speed of 90/120μs,external quantum efficiency(EQE)reaching up to 1.52×10^(6)%and detectivity(D*)reaching up to 1.67×10^(15) *** excellent performance of the heterojunction photodetector was analyzed by a photocurrent mapping test and first-principle ***,the visible light imaging function was successfully attained on the MoTe_(2)/CdS_(0.42)Se_(0.58) photodetectors,indicating that the device had practical imaging application *** findings provide a reference for the design of ultrahighperformance MoTe_(2)-based photodetectors.

关键词： photodetector MoTe_(2) heterojunction visible light imaging first-principles calculations

Ionic liquid derived electrocatalysts for electrochemical water splitting

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Green energy & Environment 2024年第4期9卷 604-622页

作者： Tianhao Li Weihua Hu Chongqing key laboratory for advanced Materials and Technologies of Clean energy School of Materials and EnergySouthwest UniversityChongqing400715China Yibin Academy of Southwest University University RoadYibinSichuan644005China

Hydrogen production from electrochemical water splitting is a promising strategy to generate green energy,which requires the development of efficient and stable electrocatalysts for the hydrogen evolution reaction and the oxygen evolution reaction(HER and OER).Ionic liquids(ILs)or poly(ionic liquids)(PILs),containing heteroatoms,metal-based anions,and various structures,have been frequently involved as precursors to prepare electrocatalysts for water ***,ILs/PILs possess high conductivity,wide electrochemical windows,and high thermal and chemical stability,which can be directly applied in the electrocatalysis process with high *** this review,we focus on the studies of ILs/PILs-derived electrocatalysts for HER and OER,where ILs/PILs are applied as heteroatom dopants and metal precursors to prepare catalysts or are directly utilized as the *** to those attractive properties,IL/PIL-derived electrocatalysts exhibit excellent performance for electrochemical water *** these accomplishments and developments are systematically summarized and thoughtfully ***,the overall perspectives for the current challenges and future developments of ILs/PILs-derived electrocatalysts are provided.

关键词： Ionic liquid Electrochemical water splitting Hydrogen evolution reaction Oxygen evolution reaction

Suppression of multistep phase transitions of O3-type cathode for sodium-ion batteries

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Chinese Chemical Letters 2024年第5期35卷 453-458页

作者： Shengyu Zhao Qinhao Shi Wuliang Feng Yang Liu Xinxin Yang Xingli Zou Xionggang Lu Yufeng Zhao Institute for Sustainable energy&College of Sciences Shanghai UniversityShanghai 200444China State key laboratory of advanced Special Steel&Shanghai key laboratory of advanced Ferrometallurgy&School of Materials Science and Engineering Shanghai UniversityShanghai 200444China

O3-type layered oxide cathodes have been widely investigated due to their high reversible capacities and sufficient Na+***,such materials usually suffer from complex multistep phase transitions along with drastic volume changes,leading to the unsatisfied cycle ***,we report a Mg/Ti co-doped O3-type NaNi_(0.5)Mn_(0.5)O_(2),which can effectively suppress the complex multistep phase transition and realize a solid-solution reaction within a wide voltage *** is confirmed that,the Mg/Ti co-doping is beneficial to enhance the structural stability and integrity by absorbing micro-strain and ***,the as obtained sample delivers an outstanding cyclic performance(82.3%after 200 cycles at 1 C)in the voltage range of 2.0-4.0 V,and a high discharge capacity of 86.6 mAh/g after 100 cycles within the wide voltage range(2.0-4.5 V),which outperform the existing *** co-doping strategy offers new insights into high performance O3-type cathode for sodium ion batteries.

关键词： Sodium ion batteries Mg/Ti co-doping Phase transition Cyclic performance High voltage performance