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Create Rich Oxygen Defects of Unique Tubular Hierarchical molybdenum dioxide to Modulate Electron Transfer Rate for Superior High-Energy Metal-Ion Hybrid Capacitor

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Energy & Environmental Materials 2023年第3期6卷 193-204页

作者： Heng Zhang Jinggao Wu Zhuo Zou Youcun Bai Chao Wu Qingxin Zeng Feng Liu Wei Shen Jian Jiang Chang Ming Li Institute of Clean Energy and Advanced Materials School of Materials and energySouthwest UniversityChongqing 400715China Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies Chongqing 400715China Key Laboratory of Rare Earth Optoelectronic Materials&Devices College of Chemistry and Materials EngineeringHuaihua UniversityHuaihua 418000China School of Chemistry and Chemical Engineering Chongqing UniversityChongqing 401331China Institute of Materials Science and Devices School of Materials Science and EngineeringSuzhou University of Science and TechnologySuzhou 215011China

Metal-ion capacitors could merit advantages from both batteries and capacitors,but they need to overcome the severe restrictions from their sluggish reaction kinetics of the battery type electrode and low specific capacitance of capacitor type electrode for both high energy and power density.Herein,we use the Kirkendall effect for the first time to synthesize unique tubular hierarchical molybdenum dioxide with encapsulated nitrogen-doped carbon sheets while in situ realizing phosphorus-doping to create rich oxygen vacancies(P-MoO_(2-x)@NP-C)as a sodium-ion electrode.Experimental and theoretical analysis confirm that the P-doping introduced oxygen defects can partially convert the high-bond-energy Mo–O to low-bond-energy Mo–P,resulting in a low oxidation state of molybdenum for enhanced surface reactivity and rapid reaction kinetics.The as-prepared P-MoO_(2-x)@NP-C as an ion-battery electrode is further used to pair active N-doped carbon nanosheet(N-C-A)electrode for Na-ion hybrid capacitor,delivering excellent performance with an energy density of 140.3 Wh kg^(−1),a power density of 188.5 W kg^(−1)and long stable life in non-aqueous solution,which ranks the best among all reported MoO x-based hybrid capacitors.P-MoO_(2-x)@NP-C is also used to fabricate a zinc-ion hybrid capacitor,also accomplishing a remarkable energy density of 43.8 Wh kg^(−1),a power density of 93.9 W kg^(−1),and a long stable life@2A g^(−1)of 32000 cycles in aqueous solutions,solidly verifying its universal significance.This work not only demonstrates an innovative approach to synthesize high-performance metal ion hybrid capacitor materials but also reveals certain scientific insights into electron transfer enhancement mechanisms.

关键词： molybdenum dioxide oxygen vacancies phosphorus incorporation sodium-ion hybrid capacitor Zinc-ion hybrid capacitor

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MXene coupled with molybdenum dioxide nanoparticles as 2D-0D pseudocapacitive electrode for high performance flexible asymmetric micro-supercapacitors

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Journal of Materiomics 2020年第1期6卷 138-144页

作者： Liangzhu Zhang Guoliang Yang Zhiqiang Chen Dan Liu Jiemin Wang Yijun Qian Cheng Chen Yuchen Liu Lifeng Wang Joselito Razal Weiwei Lei Institute for Frontier Materials Deakin UniversityWaurn Ponds CampusLocked Bag 20000Victoria3220Australia

Recently,two-dimensional(2D)transition metal carbides and carbonitrides(MXenes),have shown great potential in micro-supercapacitors(MSCs).However,the maximum voltage output of symmetric MXene MSCs is limited to 0.6 V due to the oxidation effects at high anodic potentials.Herein,we developed asymmetric micro-supercapacitors(AMSCs)based on titanium carbide MXene(Ti_(3)C_(2)Tx)and MXene-MoO_(2) electrodes with an enlarged voltage window of 1.2 V,which is twice wider than that of symmetric MXene MSCs.The 2D-0D MXene-MoO_(2) microelectrode is fabricated by homogenous dispersing zerodimensional(0D)MoO_(2) nanoparticles into MXene layers to impede layers stacking and MoO_(2) nanoparticles aggregation.Notably,the AMSCs delivered good electrochemical performances of areal capacitance of ~19 mF cm^(-2) and volumetric capacitance of 63 F cm^(-3) at a scan rate of 2 mV s^(-1),and high energy density of 9.7 mW h cm^(-3) at a power density of 0.198 W cm^(-3).The AMSCs also presented exceptionally mechanical flexibility under different bending states and excellent cyclic stability,with 88% capacitance retention after 10000 cycles at a discharge current density of 0.5 mA cm^(-2).For practical application,the serially connected AMSCs are fully affordable to power electronics,which is beneficial for soft and wearable power devices.

关键词： 2D-0D structure Flexible material MXene molybdenum dioxide Asymmetric micro-supercapacitors Energy storage

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Tremella-like molybdenum dioxide as an Anode Material for Lithium ion Battery

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复旦学报（自然科学版） 2007年第5期46卷 847-页

作者： L.C.Yang Q.S.Gao Y.H.Zhang Y.Tang Y.P.Wu Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis & Innovative Materials Fudan University

1 Results molybdenum dioxide, with excellent chemical and physical properties, has been widely used in various fields[1]. As an anode material for lithium ion battery, it exhibits higher capacity than commercial carbonaceous materials, and proper morphology, structure and particle size are necessary for MoO2 to be employed as an anode material for lithium ion battery[2].We have successfully obtained tremella-like structure self-assembled with hexagonal MoO2 nanosheets via hydrothermal method using ethyl...

关键词： molybdenum dioxide nanosheet tremella anode material lithium ion battery

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Zero-Dispersion Slow Light with Wide Bandwidth in Photonic Crystal Coupled Waveguides

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Chinese Physics Letters 2008年第12期25卷 4311-4313页

作者：毛晓宇张耕砚黄翊东张巍彭江得 State Key Laboratory of Integrated Optoelectronics Department of Electronic Engineering Tsinghua University Beijing 100084

By introducing an adjustment waveguide besides the incident waveguide, zero-dispersion slow light with wide bandwidth can be realized due to anticrossing of the incident waveguide mode and the adjustment waveguide mode. The width of the adjustment waveguide （W2） and the hole radii of the coupling region （r＇） will change the dispersion of incident waveguide mode. Theoretical investigation reveals that zero dispersion at various low group velocity vg in incident waveguide can be achieved. In particular, proper W2 and r＇ can lead to the lowest vg of 0.0085c at 1550 nm with wide bandwidth of 202 GHz for zero dispersion.

关键词： field emission molybdenum dioxide enhancement factor

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Half-Lives of Superheavy Nuclei in Z = 113 Alpha Decay Chain

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Chinese Physics Letters 2008年第12期25卷 4230-4232页

作者：董建敏张鸿飞左维李君清 School of Nuclear Science and Technology Lanzhou University Lanzhou 730000 Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000

The generalized liquid drop model （GLDM）, including the proximity effects and centrifugal potential, and the cluster model with Cosh potential are used to study the half-lives of some Z = 113 isotopes and their α-decay products. The experimental half-lives of 284^113, 283^113, 282^113 and their α-decay products are well reproduced by the two models when zero angular momenta transfer is assumed. For 278^113 and its α-decay products, both the GLDM and the duster model could provide satisfactory results if we assume the α particle carry five units of angular momenta, which indicates that possible nonzero angular momenta transfer and need further experimental measurements with high precision. Finally, we show that half-lives of α-decay are quite sensitive to the angular momentum transfers, and a formula could be used to describe the correlation between α-decay half-life and angular momentum transfer successfully.

关键词： field emission molybdenum dioxide enhancement factor

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Calculation of Nuclear Deeply Virtual Compton Scattering in HERMES Experiment

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Chinese Physics Letters 2009年第1期26卷 66-69页

作者：叶红学冒亚军王思广孙博 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871

We investigate the possibility to acquire information of nuclear generalized parton distribution （GPD） H by studying the deeply virtual Compton scattering （DVCS） off several nuclear targets at the HERMES group （Hadron Electron Ring Accelerator Measurement of Spin）. Two different models are used and developed to demonstrate the leading asymmetry amplitude.A^sinФ LU for coherent-enriched and incoherent-enriched parts with both statistical and systematic uncertainties estimated. It is found that a clear enhancement of ratio of nuclear asymmetry A ^AsinФ to free proton asymmetry A^H,sinФ LU in the coherent-enriched region is expected by both models,and a decrease of the ratio in incoherent-enriched region; both give the information about nuclear modifications. It is also possible to distinguish between those two models even under the limited statistics.

关键词： field emission molybdenum dioxide enhancement factor

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Two-Step Oxidation of Pb（111） Surfaces

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Chinese Physics Letters 2009年第1期26卷 238-240页

作者：姜鹏王立莉宁艳晓齐云马旭村贾金锋薛其坤 Institute of Physics Chinese Academy of Sciences Beijing 100190 Department of Physics Tsinghua University Beijing 100084

We report on a two-step method for oxidation of Pb（111） surfaces, which consists of low temperature （90K） adsorption of 02 and subsequent annealing to room temperature. In situ scanning tunnelling microscopy observation reveals that oxidation of Pb（111） can occur effectively by this method, while direct room temperature adsorption results in no oxidation. Temperature-dependent adsorption behaviour suggests the existence of a precursor state for 02 adsorption on Pb（111） surfaces and can explain the oxidation-resistance of clean Pb（111） surface at room temperature.

关键词： field emission molybdenum dioxide enhancement factor

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High Power Continuous-Wave Diode-End-Pumped 1.34-μm Nd：GdVO4 Laser

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Chinese Physics Letters 2008年第12期25卷 4273-4275页

作者：周睿阮双琛杜晨林姚建铨 Shenzhen Key Laboratory of Laser Engineering College of Electronic Science and Technology Shenzhen University Shenzhen 518060 College of Precision Instrument and Optoelectronics Engineering Institute of Laser and Optoelectronics Tianjin University Tianjin 300072

A high power cw all-solid-state 1.34-μm Nd：GdVO4 laser is experimentally demonstrated. With a diode-double-end-pumped configuration and a simple plane-parallel cavity, a maximum output power of 27.9 W is obtained at incident pump power of 96 W, introducing a slope efficiency of 35.4%. To the best of our knowledge, this is the highest output power of diode-end-pumped 1.3-μm laser. With the experimental data, the thermal-stress- resistance figure of merit of Nd：GdVO4 crystal with 0.3 at% Nd^3＋ doped level is calculated to be larger than 9.94 W/cm.

关键词： field emission molybdenum dioxide enhancement factor

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Physical Explanation on Designing Three Axes as Different Resolution Indexes from GRACE Satellite-Borne Accelerometer

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Chinese Physics Letters 2008年第12期25卷 4482-4485页

作者：郑伟许厚泽钟敏贠美娟 Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan 430077 Disaster Prevention Research Institute Kyoto University Uji Kyoto 611-0011 Japan Department of Applied Physics Wuhan University of Science and Technology Wuhan 430081

The GRACE Earth＇s gravitational field complete up to degree and order 120 is recovered based on the same and different three-axis resolution indexes from satellite-borne accelerometer using the improved energy conservation principle. The results show that designing XA1（2） as low-sensitivity axis （3 × 10^-9 m/s^2） of accelerometer and designing YA1（2） and ZA1（2） as high-sensitivity axes （3 × 10^-10 m/s^2） are reasonable. The physical reason why the resolution of XA1（2） is one order of magnitude lower than YA1（2） and ZA1（2） is that non-conservative forces acting on GRACE satellites are mainly decomposed into YA1（2） and ZA1（2） in the orbital plane. Since XA1（2） is not orthogonal accurately to orbital plane during the development of accelerometer, the measurement of XA1（2） can not be thrown off entirely, but be reduced properly.

关键词： field emission molybdenum dioxide enhancement factor

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Influence of Dopants in ZnO Films on Defects

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Chinese Physics Letters 2008年第12期25卷 4442-4445页

作者：彭成晓翁惠民张杨马兴平叶邦角 Institute of Microsystem Physics Henan University Kaifeng 475004 Modern Physics Department University of Science and Technology of China Hefei 230026

The influence of dopants in ZnO films on defects is investigated by slow positron annihilation technique. The results show S that parameters meet SAl 〉 Sun 〉 SAg for Al-doped ZnO films, undoped and Ag-doped ZnO films. Zinc vacancies are found in all ZnO films with different dopants. According to S parameter and the same defect type, it can be induced that the zinc vacancy concentration is the highest in the Al-doped ZnO film, and it is the least in the Ag-doped ZnO film. When Al atoms are doped in the ZnO films grown on silicon substrates, Zn vacancies increase as compared to the undoped and Ag-doped ZnO films. The dopant concentration could determine the position of Fermi level in materials, while defect formation energy of zinc vacancy strongly depends on the position of Fermi level, so its concentration varies with dopant element and dopant concentration.

关键词： field emission molybdenum dioxide enhancement factor

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