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3D flower-like mesoporous Bi_(4)O_(5)I_(2)/mos_(2)Z-scheme heterojunction with optimized photothermal-photocatalytic performance

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Green Energy & Environment 2023年第1期8卷 200-212页

作者： Sijia Song Zipeng Xing Ke Wang Huanan Zhao Peng Chen Zhenzi Li Wei Zhou Department of Environmental Science School of Chemistry and Materials ScienceKey Laboratory of Functional Inorganic Material ChemistryMinistry of Education of the People's Republic of ChinaHeilongjiang UniversityHarbin150080China Shandong Provincial Key Laboratory of Molecular Engineering School of Chemistry and Chemical EngineeringQilu University of Technology(Shandong Academy of Sciences)JinanShandong250353China

3D flower-like hierarchical mesoporous Bi_(4)O_(5)I_(2)/mos_(2)Z-scheme layered heterojunction photocatalyst was fabricated by oil bath and hydrothermal methods.The heterojunction with narrow band gap of~1.95 eV extended the photoresponse to near-infrared region,which showed obvious photothermal effect due to the introduction of mos_(2) with broad spectrum response.mos_(2) nanosheets were anchored onto the surface of flower-like hierarchical mesoporous Bi_(4)O_(5)I_(2) nanosheets,thereby forming efficient layered heterojunctions,the solar-driven photocatalytic efficiency in degradation of highly toxic dichlorophenol and reduction of hexavalent chromium was improved to 98.5%and 99.2%,which was~4 and 7 times higher than that of the pristine Bi_(4)O_(5)I_(2),respectively.In addition,the photocatalytic hydrogen production rate reached 496.78 μmol h^(-1)g^(-1),which was~6 times higher than that of the pristine Bi_(4)O_(5)I_(2).The excellent photocatalytic performance can be ascribed to the promoted photothermal effect,as well as,the formation of compact Z-scheme layered heterojunctions.The 3D flower-like hierarchical mesoporous structure provided adequate surface active-sites,which was conducive to the mass transfer.Moreover,the high stability of the prepared photocatalyst further promoted its potential practical application.This strategy also provides new insights for fabricating layered Zscheme heterojunctions photocatalysts with highly photothermal-photocatalytic efficiency.

关键词： Photocatalysis Z-scheme heterojunction Bi4O5I2 mos2 Photothermal effect

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Template-free synthesis of core-shell Fe_(3)O_(4)@mos_(2)@mesoporous TiO_(2) magnetic photocatalyst for wastewater treatment

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International Journal of Minerals,Metallurgy and Materials 2023年第1期30卷 177-191页

作者： Jingshu Yuan Yao Zhang Xiaoyan Zhang Liang Zhao Hanlin Shen Shengen Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Xi’an Fanyi University Xi’an 710105China Civil and Environmental Engineering Michigan State UniversityEast LansingMI 48824USA

TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(<5%of sunlight),low charge separation efficiency,and difficulties... 详细信息

TiO_(2)is the dominant and most widely researched photocatalyst for environmental remediation,however,the drawbacks,such as only responding to UV light(mos_(2)@mesoporous TiO_(2)(FMmT)photocatalysts via a simple,green,and template-free solvothermal method combined with ultrasonic hydrolysis.It is found that FMmT possesses a high specific surface area(55.09 m2·g−1),enhanced visible-light responsiveness(~521 nm),and remarkable photogenerated charge separation efficiency.In addition,the photocatalytic degradation efficiencies of FMmT for methylene blue(MB),rhodamine B(RhB),and tetracycline(TC)are 99.4%,98.5%,and 89.3%within 300 min,respectively.The corresponding degradation rates are 4.5,4.3,and 3.1 times higher than those of pure TiO_(2)separately.Owing to the high saturation magnetization(43.1 A·m^(2)·kg^(−1)),FMmT can achieve effective recycling with an applied magnetic field.The improved photocatalytic activity is closely related to the effective transport of photogenerated electrons by the active interlayer mos_(2) and the electron–hole separation caused by the mos_(2)@TiO_(2)heterojunction.Meanwhile,the excellent light-harvesting ability and abundant reactive sites of the mesoporous TiO_(2)shell further boost the photocatalytic efficiency of FMmT.This work provides a new approach and some experimental basis for the design and performance improvement of magnetic photocatalysts by innovatively incorporating mos2 as the active interlayer and integrating it with a mesoporous shell.

关键词： core-shell mos2 mesoporous TiO2 photocatalytic degradation heterojunction magnetic recycling

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Growth of Fe-Doped and V-Doped mos2 and Their Magnetic-Electrical Effects

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Journal of Electronic Science and Technology 2022年第3期20卷 225-236页

作者： Rui Tao Zhi-Hao Yang Chao Tan Xin Hao Zun-Gui Ke Lei Yang Li-Ping Dai Xin-Wu Deng Ping-Jian Li Ze-Gao Wang the College of Materials Science and Engineering Sichuan UniversityChengdu610065China Southwest Institute of Technical Physics Chengdu610046China the State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

Magnetism in two-dimensional(2D)materials has attracted much attention recently.However,intrinsic magnetic 2D materials are rare and mostly unstable in ambient.Although heteroatom doping can introduce magnetism,the basic property especially the electrical-magnetic coupling property has been rarely revealed.Herein,both iron(Fe)-doped and vanadium(V)-doped mosfilms were grown by chemical vapor deposition.Through studying the structure and electrical property of Fe-doped and V-doped mos,it was found that both Fe and V doping would decrease the electron concentration,exhibiting a p-type doping effect.Significantly,V-doped mosdisplays a p-type conduction behavior.Although the carrier mobility decreases after heteroatom doping,both Fe and V doping could endow moswith magnetism,in which the transfer curves of both mostransistors exhibit a strong magneticdependent behavior.It is found that the magnetic response of Fe-doped moscan be tuned from~0.2 nA/T to~1.3 nA/T,with the tunability much larger than that of V-doped mos.At last,the magnetic mechanism is discussed with the local magnetic property performed by magnetic force microscopy.The typical morphology-independent magnetic signal demonstrates the formed magnetic domain structure in Fe-doped mos.This study opens new potential to design novel magnetic-electrical devices.

关键词： Magnetic domain magnetic doping mos2 p-type semiconductor

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mos2-Based Photodetectors Powered by Asymmetric Contact Structure with Large Work Function Difference

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Nano-Micro Letters 2019年第2期11卷 217-228页

作者： Zhe Kang Yongfa Cheng Zhi Zheng Feng Cheng Ziyu Chen Luying Li Xinyu Tan Lun Xiong Tianyou Zhai Yihua Gao Center for Nanoscale Characterization and Devices(CNCD)Wuhan National Laboratory for Optoelectronics(WNLO)and School of Physics and School of Materials Science and Engineering Huazhong University of Science and Technology(HUST)Luoyu Road 1037Wuhan 430074People’s Republic of China College of Materials and Chemical Engineering China Three Gorges UniversityDaxue Road 8Yichang 443002People’s Republic of China Hubei Key Laboratory of Optical Information and Pattern Recognition School of Optical Information and Energy EngineeringSchool of Mathematics and PhysicsWuhan Institute of TechnologyGuanggu 1st Road 206Wuhan 430205People’s Republic of China

Self-powered devices are widely used in the detection and sensing fields.Asymmetric metal contacts provide an effective way to obtain self-powered devices.Finding two stable metallic electrode materials with large work function differences is the key to obtain highly efficient asymmetric metal contacts structures.However,common metal electrode materials have similar and high work functions,making it difficult to form an asymmetric contacts structure with a large work function difference.Herein,Mo2C crystals with low work function(3.8 eV) was obtained by chemical vapor deposition(CVD) method.The large work function difference between Mo2C and Au allowed us to synthesize an efficient Mo2C/mos2/Au photodetector with asymmetric metal contact structure,which enables light detection without external electric power.We believe that this novel device provides a new direcfor the design of miniature self-powered photodetectors.These results also highlight the great potential of ultrathin Mo2C prepared by CVD in heterojunction device applications.

关键词： Mo2C mos2 Chemical vapor deposition Asymmetric metal contacts Photodetector

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mos2对热压Fe基金刚石钻头胎体性能的影响研究

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煤田地质与勘探 2023年第4期51卷 170-178页

作者：章文姣谭松成潘秉锁金鑫孔祥清龙尚琳辽宁工业大学土木建筑工程学院辽宁锦州121001 中国地质大学(武汉)工程学院湖北武汉430074 中煤科工西安研究院(集团)有限公司陕西西安710077

金刚石钻头是勘探工作中的常见破岩工具,但金刚石热稳定性较差,在钻进过程中会不断产生热量,干旱缺水条件下钻头自冷却对钻进效率的提高具有非常重要的意义。为降低干钻条件下钻头胎体与岩石界面间的摩擦因数从而减少钻进过程中金刚石... 详细信息

金刚石钻头是勘探工作中的常见破岩工具,但金刚石热稳定性较差,在钻进过程中会不断产生热量,干旱缺水条件下钻头自冷却对钻进效率的提高具有非常重要的意义。为降低干钻条件下钻头胎体与岩石界面间的摩擦因数从而减少钻进过程中金刚石的热损伤,在热压Fe基金刚石钻头胎体中添加二硫化钼(mos2),研究mos2含量对Fe基钻头胎体相对密度、洛氏硬度、抗弯强度以及与白刚玉砂轮干磨时的磨损量和摩擦因数的影响,并用扫描电子显微镜(SEM)和能谱仪(EDS)等测试仪器分析了抗弯强度和摩擦磨损试验后的试样断口和表面的形貌及物相成分。试验结果表明,在试验范围内,Fe基胎体相对密度与mos2含量关系不大,但是与未添加mos2的Fe基胎体相比,其相对密度提高了约2.5%,达98%以上。Fe基胎体洛氏硬度随着mos2含量的增加先增大后减小,在mos2体积分数为8%时胎体硬度最大,洛氏硬度HRB值达101.3。Fe基胎体抗弯强度随着mos2含量的增加先增大后减小,在mos2体积分数为2%时胎体抗弯强度最大,达1140 MPa。Fe基胎体磨损量随着mos2含量的增加先减小后增大,在mos2体积分数为4%时磨损量最小,为0.376 g。Fe基胎体与岩石界面间的摩擦因数则随着mos2含量的增加而逐渐下降,在mos2体积分数为10%时摩擦因数最小,为0.325。抗弯强度断裂试样断口形貌和物相分析表明,mos2的加入降低了Fe基胎体显微组织的连续性。摩擦磨损试验后试样形貌分析表明,mos2的加入降低了摩擦磨损过程中的粘着磨损和塑性变形。研究成果为减少干钻条件下金刚石磨损和热损伤,提高胎体耐磨性,延长钻头寿命奠定了理论基础。

关键词： mos2 金刚石钻头热压Fe基胎体机械性能摩擦学性能

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三维双金属硫化物Co9S8/mos2/C异质结用于增强钠离子存储(英文)

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新型炭材料(中英文) 2023年第3期38卷 510-521页

作者：陈红穆建佳边煜华高宣雯王达刘朝孟骆文彬东北大学冶金学院能源电化学与城市矿冶金研究所

钠离子电池(SIBs)的阳极材料一直备受研究关注，但缓慢的动力学行为和较大的体积变化限制了其在实际应用中的推广。为了克服这些问题，本研究利用金属有机框架和mos2的优异性能，设计并制备了具有稳定骨架结构的复合材料。以Co-ZIF为前... 详细信息

钠离子电池(SIBs)的阳极材料一直备受研究关注，但缓慢的动力学行为和较大的体积变化限制了其在实际应用中的推广。为了克服这些问题，本研究利用金属有机框架和mos2的优异性能，设计并制备了具有稳定骨架结构的复合材料。以Co-ZIF为前驱体，添加Mo源材料，在高温硫化烧结的过程中，构建了花状的Co9S8/mos2/C复合材料，探究其在不同温度条件下的结构和电化学性能。此外，通过密度泛函理论(DFT)分析了Co9S8(001)/mos2异质结对扩散动力学的影响。结果表明，电子结构在异质结构的界面处发生了重塑，Co9S8/mos2表现出典型的金属性和显著增强的电子导电性。在所有样品中，700°C合成的阳极材料Co9S8/mos2/C具有更稳定的结构和优异的电化学性能。当电流密度从4 000恢复到40 mA g-1时，Co9S8/mos2/C-700的放电容量可以从368 mAh g-1完全恢复到571 mAh g-1，并稳定在543 mAh g-1。综上所述，本研究提供了一些关于异质结材料合理制备的思路，有助于设计高性能的金属钠离子电池负极复合材料。

关键词：钠离子电池负极金属有机框架 mos2 Co9S8

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mos2 nanorods with inner caves through synchronous encapsulation of sulfur for high performance Li–S cathodes

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Journal of Energy Chemistry 2020年第6期29卷 18-24,I0002页

作者： Yikun Yi Zechen Liu Pu Yang Tao Wang Xuewen Zhao Hongyang Huang Yonghong Cheng Jinying Zhang Mingtao Li Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049ShaanxiChina State Key Laboratory of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy(CNRE)School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina Guangdong Xi’an Jiaotong University Academy Foshan 528300GuangdongChina School of Environment and Architecture Dongguan University of TechnologyDongguan 523808GuangdongChina

Lithium–sulfur(Li–S)batteries have become one of the most promising candidates for next-generation batteries owing to their high specific capacity,low cost,and environment-friendliness.Many efforts have been made to mitigate the"shuttle effect"through physical adsorption and chemical bonding.mos2 has been proposed as a cathode material to provide effective anchoring sites for lithium polysulfides(Li PSs),but is still limited by its layer structure.Herein,we designed novel mos2 nanorods with inner caves based on our previous work,and performed synchronous encapsulation of sulfur during the synthesis process.The outer mos2 tubular shells physically inhibit the outward diffusion of polysulfide species while the inner particles chemically anchor the polysulfides to prevent shuttling.As the cathode matrix in Li–S batteries,the electrochemical results deliver a high initial discharge capacity of 1213 mAhg^-1 for sulfur at 0.1 C.After cycling at 1 C for 300 cycles,the cells exhibit a capacity decay of only 0.076%per cycle and high average coulombic efficiency over 95%.The tubular mos2 structure is an innovative and appealing design,which could be regarded as a prospective substrate for the improved performance of Li–S batteries.

关键词： mos2 nanorod Inner caves Synchronous encapsulation of sulfur Cathode matrix

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mos2 as a long-life host material for potassium ion intercalation

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Nano Research 2017年第4期10卷 1313-1321页

作者： Xiaodi Ren Qiang Zhao William D. McCulloch Yiying Wu Department of Chemistry and Biochemistry The Ohio State University 151 W Woodruff Ave Columbus OH 43210 USA College of Chemical Engineering Sichuan University Chengdu 610065 China

Electrochemical potassium ion intercalation into two-dimensional layered mos2 was studied for the first time for potential applications in the anode in potassium-based batteries. X-ray diffraction analysis indicated that an intercalated potassium compound, hexagonal K0.4mos2, formed during the intercalation process. Despite the size of K^＋, mos2 was a long-life host for repetitive potassium ion intercalation and de-intercalation with a capacity retention of 97.5% after 200 cycles. The diffusion coefficient of the K^＋ ions in Kxmos2 was calculated based on the Randles-Sevcik equation. A higher K^＋ intercalation ratio not only encountered a much slower K^＋ diffusion rate in mos2, but also induced mos2 reduction. This study shows that metal dichalcogenides are promising potassium anode materials for emerging K-ion, K-O2, and K-S batteries.

关键词： potassium ion intercalation potassium battery mos2 phase evolution potassium ion diffusion

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mos_2 Nanosheet Arrays Rooted on Hollow rGO Spheres as Bifunctional Hydrogen Evolution Catalyst and Supercapacitor Electrode

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Nano-Micro Letters 2018年第4期10卷 70-80页

作者： Shizheng Zheng Lijun Zheng Zhengyou Zhu Jian Chen Jianli Kang Zhulin Huang Dachi Yang Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Department of Electronics College of Electronic Information and Optical Engineering Nankai University School of Material Science and Engineering Tianjin Polytechnic University Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology Institute of Solid State Physics Chinese Academy of Sciences

mos_2 has attracted attention as a promising hydrogen evolution reaction(HER) catalyst and a supercapacitor electrode material. However, its catalytic activity and capacitive performance are still hindered by its aggregation and poor intrinsic conductivity. Here, hollow rGO sphere-supported ultrathin mos_2 nanosheet arrays(hrGO@mos_2) are constructed via a dual-template approach and employed as bifunctional HER catalyst and supercapacitor electrode material. Because of the expanded interlayer spacing in mos_2 nanosheets and more exposed electroactive S–Mo–S edges, the constructed h-rGO@mos_2 architectures exhibit enhanced HER performance. Furthermore, benefiting from the synergistic effect of the improved conductivity and boosted specific surface areas(144.9 m^2 g^(-1), ca. 4.6-times that of pristine mos_2), the h-rGO@mos_2 architecture shows a high specific capacitance(238 F g^(-1) at a current density of 0.5 A g^(-1)), excellent rate capacitance, and remarkable cycle stability. Our synthesis method may be extended to construct other vertically aligned hollow architectures,which may serve both as efficient HER catalysts and supercapacitor electrodes.

关键词： mos2 Reduced graphene oxide(rGO) Hollow spheres Hydrogen evolution reaction(HER) Supercapacitor

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mos2 embedded in 3D interconnected carbon nanofiber film as a free-standing anode for sodium-ion batteries

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Nano Research 2018年第7期11卷 3844-3853页

作者： Hai Yang Min Wang Xiaowu Liu Yu Jiang Yan Yu CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China State Key Laboratory of Fire Science University of Science and Technology of China Hefei 230026 China

As a typical two-dimensional transition metal dichalcogenide, molybdenum disulfide （mos2） is considered a potential anode material for sodium-ion batteries （NIBs）, due to its relatively high theoretical capacity （~ 670 mAh·g--1）. However, the low electrical conductivity of mos2 and its dramatic volume change during charge/discharge lead to severe capacity degradation and poor cycling stability. In this work, we developed a facile, scalable, and effective synthesis method to embed nanosized mos2 into a thin film of three-dimensional （3D）-interconnected carbon nanofibers （CNFs）, producing a mos2/CNFs film. The free-standing mos2/CNFs thin film can be used as anode for NIBs without additional binders or carbon black. The mos2/CNFs electrode exhibits a high reversible capacity of 260 mAh·g^-1, with an extremely low capacity loss of 0.05 mAh·g^-1 per cycle after 2,600 cycles at a current density of 1 A·g^-1. This enhanced sodium storage performance is attributed to the synergistic effect and structural advantages achieved by embedding mos2 in the 3D-interconnected carbon matrix.

关键词： mos2 sodium ion batter flexible electrode three-dimensional （3D）interconnected carbon nanofiber

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