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Vacancy defect MoSeTe embedded in N and F co-doped carbon skeleton for high performance sodium ion batteries and hybrid capacitors

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Journal of energy Chemistry 2024年第3期90卷 652-664,I0014页

作者： Dehui Yang Wentao Guo Fei Guo Jiaming Zhu Gang Wang Hui Wang Guanghui Yuan Shenghua Ma Beibei Wang State Key Laboratory of Photon-Technology in Western China energy International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsInstitute of Photonics&Photon-TechnologyNorthwest UniversityXi’an 710127ShannxiChina Key Laboratory of Synthetic and Natural Functional Molecule Chemistry(Ministry of Education) College of Chemistry&Materials ScienceNorthwest UniversityXi’an 710127ShannxiChina School of Chemistry and Chemical Engineering Ankang Research Centre of New Nano-materials Science and TechnologyShaanxi University Innovation Research Institute of Advanced Energy Storage Materials and Battery Technology for Future IndustrializationAnkang UniversityAnkang 725000ShannxiChina

Sodium-ion batteries(SIBs) and hybrid capacitors(SIHCs) have garnered significant attention in energy storage due to their inherent advantages,including high energy density,cost-effectiveness,and enhanced safety.However,developing high-performance anode materials to improve sodium storage performa nce still remains a major challenge.Here,a facile one-pot method has been developed to fabricate a hybrid of MoSeTe nanosheets implanted within the N,F co-doped honeycomb carbon skeleton(MoSeTe/N,F@C).Experimental results demonstrate that the incorporation of large-sized Te atoms into MoSeTe nanosheets enlarges the layer spacing and creates abundant anion vacancies,which effectively facilitate the insertion/extraction of Na^(+) and provide numerous ion adsorption sites for rapid surface capacitive behavior.Additionally,the heteroatoms N,F co-doped honeycomb carbon skeleton with a highly conductive network can restrain the volume expansion and boost reaction kinetics within the electrode.As anticipated,the MoSeTe/N,F@C anode exhibits high reversible capacities along with exceptional cycle stability.When coupled with Na_(3)V_(2)(PO_(4))_(3)@C(NVPF@C) to form SIB full cells,the anode delivers a reversible specific capacity of 126 mA h g^(-1) after 100 cycles at 0.1 A g^(-1).Furthermore,when combined with AC to form SIHC full cells,the anode demonstrates excellent cycling stability with a reversible specific capacity of50 mA h g^(-1) keeping over 3700 cycles at 1.0 A g^(-1).In situ XRD,ex situ TEM characterization,and theoretical calculations(DFT) further confirm the reversibility of sodium storage in MoSeTe/N,F@C anode materials during electrochemical reactions,highlighting their potential for widespread practical application.This work provides new insights into the promising utilization of advanced transition metal dichalcogenides as anode materials for Na^(+)-based energy storage devices.

关键词： MoSeTe N F co-doped honeycomb carbon skeleton Sodium-ion batteries Sodium-ion hybrid capacitor

维普期刊数据库

Impact of oxygen incorporation on interface optimization and defect suppression for efficiency enhancement in Cu2ZnSn（S,Se）4 solar cells

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Journal of energy Chemistry 2024年第8期95卷 77-85页

作者： Shicheng Deng Songfan Wang Yuanyuan Wang Qian Xiao Yuena Meng Dongxing Kou Wenhui Zhou Zhengji Zhou Zhi Zheng Sixin Wu Key Laboratory for Special Functional materials of MOE National & Local Joint Engineering Research Centre for High-efficiency Display and Lighting TechnologySchool of Materials Henan University Key Laboratory of Micro-Nano materials for energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University

Kesterite Cu2ZnSn（S,Se）4（CZTSSe） solar cells suffer from severe carrier recombination, limiting the photovoltaic performance. Unfavorable energy band alignment at the p-n junction and defective front interface are two main causes. Herein, oxygen incorporation in CZTSSe via absorber air-annealing was developed as a strategy to optimize its surface photoelectric property and reduce the defects. With optimized oxygen incorporation conditions, the carrier separation and collection behavior at the front interface of the device is improved. In particular, it is found that oxygen incorporated absorber exhibits increased band bending, larger depletion region width, and suppressed absorber defects. These indicate the dynamic factors for carrier separation become stronger. Meanwhile, the increased potential difference between grain boundaries and intra grains combined with the decreased concentration of interface deep level defect in the absorber provide a better path for carrier transport. As a consequence, the champion efficiency of CZTSSe solar cells has been improved from 9.74% to 12.04% with significantly improved open-circuit voltage after optimized air-annealing condition. This work provides a new insight for interface engineering to improve the photoelectric conversion efficiency of CZTSSe devices.

关键词： Defect suppression Interface optimization Kesterite Surface oxidation Thin film solar cell

High-temperature elemental segregation induced structure degradation in high-entropy fluorite oxide

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Journal of Advanced Ceramics 2024年第3期13卷 310-322页

作者： Yixuan Hu Mariappan Anandkumar Yumeng Zhang Joydip Joardar Atul Suresh Deshpande Xiaodong Wang Kolan Madhav Reddy School of materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of materials Science and Metallurgical Engineering Indian Institute of Technology HyderabadSangareddy 502285India international Advanced research centre for Powder Metallurgy and New materials(ARCI) Hyderabad 500005India

Fluorite-structured oxides constitute an important category of oxides with a wide range of high-temperature applications.Following the concept of high entropy,high-entropy fluorite oxides(HEFOs)have showcased intriguing high-temperature application potential.However,unlocking this potential necessitates an assessment of their long-term stability under high-temperature conditions.In this study,we conducted a prolonged heat treatment at 1000℃on typical HEFO,specifically(CeHfZrGdLa)O_(x).After 100 h,high-intensity X-ray diffraction(XRD)revealed a transition from a single-phase fluorite to a multi-phase configuration.Further investigation by analytical electron microscoy(AEM)demonstrated that this degradation resulted from facilitated element diffusion and consequent escalating chemical fluctuation at high temperatures,leading to spontaneous segregation and separation of Ce and La elements,forming Ce-rich,La-poor,and La-rich phases.Notably,the La-rich phase spontaneously transformed from a fluorite structure(space group Fm3m)to a bixbyite structure(space group Ia3)at elevated temperatures,resulting in the appearance of superstructure reflection in XRD profiles and electron diffraction patterns.Despite the intricate phase decomposition,the energy band gap showed minimal variation,suggesting potential property stability of(CeHfZrGdLa)O_(x)across a broad range of compositions.These findings offer valuable insights into the future applications of HEFOs.

关键词： phase transition high-temperature stability elemental segregation high-entropy fluorite oxides(HEFOs)

Top priority current path between SiC particles during ultra-high temperature flash sintering: Presence of PyC “bridges”

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Journal of Advanced Ceramics 2024年第2期13卷 255-262页

作者： Le Lu Tianlong Liu Zhaofeng Chen Fei Wang Mengmeng Yang Qiong Wu Lixia Yang Huanyong Li international Laboratory for Insulation and energy Efficiency materials College of Materials Science and TechnologyNanjing University of Aeronautics and AstronauticsNanjing 211106China State Key Laboratory of Solidification Processing School of Materials and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China

Flash sintering(FS)is a novel technique for rapidly densifying silicon carbide(SiC)ceramics.This work achieved a rapid sintering of SiC ceramics by the utilization of ultra-high temperature flash sintering within 60 s.Pyrolysis carbon(PyC)“bridges”were constructed between SiC particles through the carbonisation of phenolic resin,providing a large number of current channels.The incubation time of the flash sintering process was significantly reduced,and the sintering difference between the centre and the edge regions of the ceramics was minimized,with an average particle size of the centre region and edge region being 12.31 and 9.02μm,respectively.The results showed that the porosity of the SiC ceramics after the flash sintering was reduced to 14.79% with PyC“bridges”introduced,and the Vickers hardness reached 19.62 GPa.PyC“bridges”gradually evolved from amorphous eddy current carbon to oriented graphite carbon,indicating that the ultra-high temperature environment in which the sample was located during the flash sintering was successfully constructed.Ultra-high temperature flash sintering of SiC is expected to be applied to the local repair of matrix damage in SiC ceramic matrix composites.

关键词： silicon carbide(SiC) flash sintering(FS) pyrolytic carbon(PyC)"bridges" current path instantaneous

Highly uniform Co-Cu bimetallic sulfides for rechargeable alkaline aqueous zinc batteries

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Chinese Chemical Letters 2024年第2期35卷 521-526页

作者： Xiaofang Bai Yuwei Zhao Mangwei Cui Tianshuo Guo Zijie Tang Chuan Li Heng Gao Shuo Yang Lingzhi Zhao Chunyi Zhi Hongfei Li Department of materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Songshan Lake materials Laboratory Dongguan 523808China Department of materials Science and Engineering City University of Hong KongHong KongChina international centre for Quantum and Molecular Structures Department of PhysicsShanghai UniversityShanghai 200444China Guangdong Provincial Engineering Technology research Center for Low Carbon and Advanced energy materials Institute of Semiconductor Science and TechnologySouth China Normal UniversityGuangzhou 510631China

Rechargeable alkaline aqueous zinc batteries(RAZBs)have attracted increasing attention.However,most RAZBs are hindered by the limited availability of cathode materials.The practical electrochemical performance of most cathode materials is lower than the theoretical value due to their poor electrical conductivity and low utilization capacity.In this work,we develop a facile hydrothermal procedure to prepare highly uniform bimetallic sulfides as novel cathode materials for RAZBs.Copper-cobalt binary metallic oxides materials possess higher conductivity and larger capacity compared with their mono-metal oxides compounds due to bimetallic synergistic effects and multiple oxidation states.Furthermore,bimetallic sulfide compounds have smaller bond energy and longer bond length than their oxides,leading to less structural damage,faster kinetics of electrochemical reactions,and better stability.The as-prepared Co-Cu bimetallic sulfides show enhanced electrochemical performance due to various valences of Co and Cu as well as the existence of S.As a result,aqueous Zn/CuCo_(2)S_(4) battery shows a high specific capacity of 117.4 mAh/g at 4 A/g and a good cycle life of over 8000 cycles.Based on PANa hydrogel electrolytes,a flexible Zn/CuCo_(2)S_(4) battery demonstrates excellent cycling stability.This battery can also meet the requirements of electronic devices with different shapes and performs well in extreme environments,such as freezing,drilling,and hammering.This work opens new avenues to obtain high-rate and long-life cathode materials for RAZBs by utilizing the synergistic effects of bimetallic sulfides and provides a new platform for flexible energy storage devices.

关键词： Aqueous zinc batteries Bimetallic sulfides Cathode materials Rate performance Cycling stability

维普期刊数据库

Sensitive humidity sensor based on moisture-driven energy generation

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Nano research 2024年第6期17卷 5578-5586页

作者： Qingchao Ni Qing Lou Chenglong Shen Guangsong Zheng Runwei Song Jingnan Hao Jialu Liu Jinyang Zhu Jinhao Zang Lin Dong Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China State centre for international Cooperation on Designer Low-Carbon&Environmental materials and School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China

The emergence of novel self-powered humidity sensors has attracted considerable attention in the fields of smart electronic devices and personal healthcare.Herein,self-powered humidity sensors have been fabricated using a moisture-driven energy generation(MEG)device based on asymmetric tubular graphitic carbon nitride(g-CN)films prepared on anodized aluminum(AAO)template.At a relative humidity(RH)of 96%,the MEG device can provide an open-circuit voltage of 0.47 V and a short-circuit current of 3.51μA,with a maximum output power of 0.08μW.With inherent self-powered ability and humidity response via current variation,an extraordinary response of 1.78×106%(41%-96%RH)can be gained from the MEG device.The possible power generation mechanism is that g-CN/AAO heterostructure can form ion gradient and diffusion under the action of moisture to convert chemical potential into electrical potential,evoking a connaturally sensitive response to humidity.Self-powered respiration monitoring device based on the sensor is designed to monitor human movement(sitting,warming up,and running)and sleep status(normal,snoring,and apnea),maintaining excellent stability during cumulative 12-h respiration monitoring.This self-powered humidity sensing technology has promising potential for extensive integration into smart electronic and round-the-clock health monitoring devices.

关键词： graphitic carbon nitride moisture-driven energy generation humidity sensor respiration monitoring

Plasma-exfoliated g-C_(3)N_(4) with oxygen doping: tailoring photocatalytic properties

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Frontiers of Chemical Science and Engineering 2024年第2期18卷 27-39页

作者： Yuxin Li Junxin Guo Rui Han Zhao Wang national Engineering research centre of Industry Crystallization Technology School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-C_(3)N_(4). In this work, ultrathin defective g-C_(3)N_(4) was successfully prepared using cold plasma. Plasma exfoliation reduces the thickness of g-C_(3)N_(4) from 10 nm to 3 nm, while simultaneously introducing a large number of nitrogen defects and oxygen atoms into g-C_(3)N_(4). The amount of doped O was regulated by varying the time and power of the plasma treatment. Due to N vacancies, O atoms formed strong bonds with C atoms, resulting in O doping in g-C_(3)N_(4). The mechanism of plasma treatment involves oxygen etching and gas expansion. Photocatalytic experiments demonstrated that appropriate amount of O doping improved the photocatalytic degradation of rhodamine B compared with pure g-C_(3)N_(4). The introduction of O optimized the energy band structure and photoelectric properties of g-C_(3)N_(4). Active species trapping experiments revealed ·O_(2)^(–) as the main active species during the degradation.

关键词： graphitic carbon nitride cold plasma oxygen doping nitrogen defect visible-light photocatalysis

Design and modification of metal sulfide-based catalysts for lithiumsulfur batteries

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Particuology 2024年第3期86卷 86-100页

作者： Yufei Zhao Chuannan Geng Li Wang Haotian Yang Wei Lv Quan-Hong Yang Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyNational Industry-Education Integration Platform of Energy Storageand Collaborative Innovation Center of Chemical Science and Engineering(Tianjin)Tianjin UniversityTianjin300072China Shenzhen Geim Graphene Center Engineering Laboratory for Functionalized Carbon MaterialsTsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen518055China Haihe Laboratory of Sustainable Chemical Transformations Tianjin300192China Joint School of national University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou350207China

Metal sulfide(MS)have good conductivity,strong adsorption ability,and excellent catalytic activity for the conversion of sulfur species,and thus,show great promise as the catalysts in LieS batteries.However,the relationship between their properties and electrochemical performance is still unclear.Thus,further in-depth discussions are required to improve their design in Li-S batteries.This review systematically summarizes the basic structural and electrochemical properties of MSs and highlights the advantages that guarantee them as high-performance catalysts in Li-S batteries.Then,various modification strategies for MSs to enhance the catalytic activity,efficiency,and stability are also reviewed.At last,future opportunities for MS catalysts in Li-S batteries are proposed.

关键词： Lithium-sulfur battery Metal sulfide Catalysis

Climate chamber investigation of the effect of indoor thermal histories on thermal adaptation in different seasons

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Energy and Built Environment

energy and Built Environment 2024年第3期5卷 455-463页

作者： Yuxin Wu Angchen Jiang Hong Liu Baizhan Li Risto Kosonen School of Civil Engineering and Architecture Zhejiang Sci-Tech UniversityHangzhouZhejiang 310018China Joint international research Laboratory of Green Buildings and Built Environments(Ministry of Education) Chongqing UniversityChongqing 400045China national centre for international research of Low-carbon and Green Buildings(Ministry of Science and Technology) Chongqing UniversityChongqing 400045China Department of Mechanical Engineering Aalto UniversityEspoo 02150Finland College of Urban Construction Nanjing Tech UniversityNanjing 210009China

The indoor thermal history of residents in the hot summer and cold winter climate zone in China have undergone a significant change in recent years,which also changes their seasonal thermal adaptations and this has formed feed-back effects to the increasing usage of air conditioning units in this area.To study the seasonal variations of thermal adaptation,the thermal comfort experiments were conducted on two groups of participants.Each groups included 20 participants who had indoor history mainly with natural ventilation(NV group)and air-conditioning(AC group),respectively.The results demonstrated that the thermal sensation vote(TSV)in warm environments did not differ between AC and NV subjects in summer.However,the TSV of AC subjects were much lower than that of NV subjects in the same standard effective temperature and skin temperature in a cold environment in winter.Overall,the participants who spent most of their time in AC space in winter showed a low level of thermal adaptation with a narrower acceptable skin temperature range of 32.6-33.5℃.Thus,this study presents the basic information regarding the seasonal effects on human thermal adaptation due to different long-term indoor thermal histories.

关键词： Skin temperature Thermal experience Thermal comfort Cold acclimation Hot summer and cold winter