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Nano Research 2023年第7期16卷 9954-9967页

作者： Zhuo Yang Yong Lu Xiaomeng Liu Fujun Li Jun Chen Renewable Energy Conversion and Storage Center(RECAST) Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education)College of ChemistryNankai UniversityTianjin 300071China

Layered lithium transition metal oxide(LTMO)cathode materials have attracted much attention for lithium-ion batteries and are shining in the current *** a clear structure-performance relationship is necessary for the performance improvement of LTMO cathode *** combination of synchrotron X-ray diffraction(XRD)with high intensity and XRD Rietveld refinement is powerful for revealing the structural characteristics of LTMO cathode *** review summarizes the application of high energy XRD and Rietveld refinement in LTMO cathode materials,including the brief introduction of synchrotron XRD and Rietveld refinement and their applications in understanding the structural evolution related to the synthetic,thermal runaway,cycling,and high-rate charge/discharge process of LTMO cathode *** XRD can provide insights into the intermediates and reaction paths in the synthesis process,the origin of thermal runaway,the mechanism of structural decay during cycles,and the structural evolution during high-rate charging/*** works should focus on the development of higher intensity X-rays to gain more in-depth insights into the intrinsic relationship between their structural characteristics and properties.

关键词： synchrotron X-ray diffraction Rietveld refinement layered cathode materials transition metal oxide lithium-ion batteries

Interior and Exterior Decoration of transition metal oxide Through Cu^(0)/Cu^(+) Co-Doping Strategy for High-Performance Supercapacitor

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Nano-Micro Letters 2021年第4期13卷 96-109页

作者： Weifeng Liu Zhi Zhang Yanan Zhang Yifan Zheng Nishuang Liu Jun Su Yihua Gao Center for Nanoscale Characterization and Devices(CNCD) School of Physics and Wuhan National Laboratory for Optoelectronics(WNLO)Huazhong University of Science and Technology(HUST)Luoyu Road 1037Wuhan 430074People’s Republic of China College of Materials Science and Engineering Guangxi Key Laboratory of Optical and Electronic Materials and DevicesGuilin University of TechnologyGuilin 541004People’s Republic of China

Although CoO is a promising electrode material for supercapacitors due to its high theoretical capacitance,the practical applications still suffering from inferior electrochemical activity owing to its low electrical conductivity,poor structural stability and inefficient ***,we report a novel Cu0/Cu+co-doped CoO composite with adjustable metallic Cu0 and ion Cu+via a facile *** interior(Cu+)and exterior(Cu0)decoration of CoO,the electrochemical performance of CoO electrode has been significantly improved due to both the beneficial flower-like nanostructure and the synergetic effect of Cu0/Cu+co-doping,which results in a significantly enhanced specific capacitance(695 F g^(-1) at 1 A g^(-1))and high cyclic stability(93.4%retention over 10,000 cycles)than pristine ***,this co-doping strategy is also applicable to other transition metal oxide(NiO)with enhanced electrochemical *** addition,an asymmetric hybrid supercapacitor was assembled using the Cu0/Cu+co-doped CoO electrode and active carbon,which delivers a remarkable maximal energy density(35 Wh kg^(-1)),exceptional power density(16 kW kg^(-1))and ultralong cycle life(91.5%retention over 10,000 cycles).Theoretical calculations further verify that the co-doping of Cu^(0)/Cu^(+)can tune the electronic structure of CoO and improve the conductivity and electron *** study demonstrates a facile and favorable strategy to enhance the electrochemical performance of transition metal oxide electrode materials.

关键词： Cu^(0)/Cu^(+)co-doping Heterostructure transition metal oxide Supercapacitor

Research progress on transition metal oxide based electrode materials for asymmetric hybrid capacitors

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Chinese Chemical Letters 2020年第9期31卷 2177-2188页

作者： Meizhen Dai Depeng Zhao Xiang Wu School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China

In the past few years,the increasing energy consumption of traditional fossil fuels has posed a huge threat to human *** is very imperious to develop the sustainable and renewable energy storage and conversion devices with low cost and environment friendly *** supercapacitors are eme rging as one of the promising energy devices with high power density,fast charge-discharge process and excellent cycle ***,morphology and structure of the electrode materials exert serious effect on their electrochemical *** this review,we summarized recent progresses in transition metal oxide based electrode materials for *** synthesis routes and electrochemical performances of electrode materials and storage mechanisms of supercapacitor devices have been presented in *** future developing trends of supercapacitor based on metal oxide electrode materials are also proposed.

关键词： Supercapacitors transition metal oxide Electrochemical performance Energy density Power density Storage mechanism

Numerical model of tandem organic light-emitting diodes based on a transition metal oxide interconnector layer

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Journal of Semiconductors 2014年第4期35卷 68-76页

作者：路飞平彭应全邢永忠 College of Physics and Information Science Tianshui Normal University Institute of Microelectronics School of Physical Science and Technology Lanzhou University

By utilizing a two-step process to express the charge generation and separation mechanism of the transition metal oxides （TMOs） interconnector layer, a numerical model was proposed for tandem organic light emitting diodes （OLEDs） with a TMOs thin film as the interconnector layer. This model is valid not only for an n-type TMOs interconnector layer, but also for a p-type TMOs interconnector layer. Based on this model, the influences of different carrier injection barriers at the interface of the electrode/organic layer on the charge generation ability of interconnector layers were studied. In addition, the distribution characteristics of carrier concentration, electric field intensity and potential in the device under different carrier injection barriers were studied. The results show that when keeping one carrier injection barrier as a constant while increasing another carrier injection barrier, carri- ers injected into the device were gradually decreased, the carrier generation ability of the interconnector layer was gradually reduced, the electric field intensity at the interface of the organic/electrode was gradually enhanced, and the electric field distribution became nearly linear： the voltage drops in two light units gradually became the same. Meanwhile, the carrier injection ability decreased as another carrier injection barrier increased. The simulation re- sults agree with the experimental data. The obtained results can provide us with a deep understanding of the work mechanism of TMOs-based tandem OLEDs.

关键词： tandem organic light-emitting diodes numerical model interconnector layer transition metal oxide

Basic deep eutectic solvents as reactant, template and solvents for ultra-fast preparation of transition metal oxide nanomaterials

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Chinese Chemical Letters 2020年第6期31卷 1584-1587页

作者： Jia Chen Mohammad Chand Ali Ruirui Liu Jean Claude Munyemana Zhan Li Honglin Zhai Hongdeng Qiu CAS Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000.China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100039China Department of Chemistry Lanzhou UniversityLanzhou 730000.China

Developing a new type of deep eutectic solvents(DESs)is indispensable for expanding their application in various ***,we report a series of new highly basic ***-IR,quantitative 1 H NMR,MD simulation and physical properties show that these basic liquids are made up of hydroxide acceptor of alkali metal hydroxides in which the hydrogen bonding interactions coordinate the *** DESs can be played three roles as new solvents,template and reactant for facile and ultra-fast preparation of transition metal oxide nanomaterials such as NiCo2 O4,MnCo2 O4,NiMn2 O4,CoCu2 O4 and Co3 O4 under mild *** work shows one of the low energy-intensive methods for nanomaterial *** initial findings of basic deep eutectic solvents provide a potential applicability around the systematic development of transition metal oxide nanosheets.

关键词： Basic deep eutectic solvents Hydrogen-bonding acceptors Hydrogen-bonding donors transition metal oxide Nanomaterials

High‑Energy-Density Fiber Supercapacitors Based on transition metal oxide Nanoribbon Yarns for Comprehensive Wearable Electronics

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Advanced Fiber Materials 2024年第6期6卷 1927-1941页

作者： Junseong Ahn Suchithra Padmajan Sasikala Yongrok Jeong Jin Goo Kim Ji‑Hwan Ha Soon Hyoung Hwang Sohee Jeon Junhyuk Choi Byung‑Ho Kang Jihyeon Ahn Jun‑Ho Jeong Sang Ouk Kim Inkyu Park Department of Electro‑Mechanical Systems Engineering Korea UniversitySejong 30019Republic of Korea Department of Materials Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea National Creative Research Initiative Center for Multi‑Dimensional Directed Nanoscale Assembly Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Mechanical Engineering Korea Advanced Institute of Science and Technology(KAIST)Daejeon 34141Republic of Korea Department of Nano Manufacturing Technology Korea Institute of Machinery and Materials(KIMM)Daejeon 34103Republic of Korea Radioisotope Research Division Korea Atomic Energy Research Institute(KAERI)Daejeon 34057Republic of Korea

Fiber supercapacitors(FSs)based on transition metal oxides(TMOs)have garnered considerable attention as energy stor-age solutions for wearable electronics owing to their exceptional characteristics,including superior comfortability and low *** materials are known to exhibit high energy densities,high specific capacitances,and fast redox ***,current fabrication methods for these structures primarily rely on chemical deposition,often resulting in undesir-able material structures and necessitating the use of additives,which can degrade the electrochemical performance of such ***,physically deposited TMO nanoribbon yarns generated via delamination engineering of nanopatterned TMO/metal/TMO trilayer arrays are proposed as potential high-performance *** prepare these arrays,the target materials were initially deposited using a nanoline mold,and subsequently,the nanoribbon was suspended through selective plasma etching to obtain the desired twisted yarn *** of the direct formation of TMOs on Ni electrodes,a high energy/power density and excellent electrochemical stability were achieved in asymmetric FS devices incorporating CoNixOy nanoribbon yarns and graphene ***,a triboelectric nanogenerator,pressure sensor,and flexible light-emitting diode were synergistically combined with the *** integration of wearable electronic components,encompassing energy harvesting,energy storage,and powering sensing/display devices,is promising for the development of future smart textiles.

关键词： Fiber supercapacitor transition metal oxide Nanoribbon yarn Wearable devices Nanostructuring

A universal strategy for the synthesis of porous twodimensional transition metal oxide nanosheets based on chemical topology transformation

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Science China Materials 2021年第10期64卷 2477-2485页

作者： Xiang Li Ziyu Qin Xiafen Hu Jian Zhang Jinjin Wu Huimin Yang Changsheng Xie Dawen Zeng The State Key Laboratory of Materials and Processing Die&Mould Technology Department of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Hainan Provincial Fine Chemical Engineering Research Center Hainan UniversityHaikou 570228China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China Analysis and Testing Center Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional(2D)transition metal oxides(TMOs)have attracted much attention for various applications,owing to the abundance of active sites,rapid ion transmission speed,and short carrier migration ***,the current preparation strategies are usually limited to producing intrinsically layered compounds or sacrificing ***,we report a universal strategy for preparing ultrathin porous 2D TMO nanosheets by chemical topological transformation of the corresponding transition metal *** observed that the as-prepared 2D TMO nanosheets not only perfectly inherit the transition metal selenides’2D topological structure,but also possess numerous pore structures formed as a way to release the structural stress associated with lattice *** a proof of concept,ultrathin porous WO_(3),Mo O_(3),and Co_(3)O_(4) nanosheets were successfully prepared based on the in-situ oxidation of the corresponding ultrathin WSe_(2),MoSe_(2),and Co_(0.85)Se,*** outstanding sensing properties and photodetector performance displayed by the as-prepared porous 2D WO_(3) nanosheets further indicate the promising prospects of topology transformation for the preparation of porous 2D TMO nanosheets.

关键词： topology transformation two-dimensional nanosheets porous transition metal oxide

transition metal oxides as hole-transporting materials in organic semiconductor and hybrid perovskite based solar cells

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Science China Chemistry 2017年第4期60卷 472-489页

作者： Pingli Qin Qin He Dan Ouyang Guojia Fang Wallace C.H. Choy Gang Li Department of Electronic and Information Engineering The Hong Kong Polytechnic University Hong Hum Kowloon Hong Kong SAR China School of Science Wuhan Institute of Technology Wuhan 430073 China College of Post and Telecommunications Wuhan Institute of Technology Wuhan 430073 China Key Laboratory of Artificial Micro- and Nano-struetures of the Ministry of Education School of Physics and Technology Wuhan University Wuhan 430072 China Department of Electrical and Electronic Engineering The University of Hong Kong Hong Kong SAR China

Organic polymer solar cells （OSCs） and organic-inorganic hybrid perovskite solar cells （PSCs） have achieved notable progress over the past several years. A central topic in these fields is exploring electronically efficient, stable and effective hole-transporting layer （HTL） materials. The goal is to enhance hole-collection ability, reduce charge recombination, increase built-in voltage, and hence improve the performance as well as the device stability. transition metal oxides （TMOs） semiconductors such as NiOx, CuOx, CrOx, MoOx, WO3, and V2O5, have been widely used as HTLs in OSCs. These TMOs are naturally adopted into PSC as HTLs and shows their importance. There are similarities, and also differences in applying TMOs in these two types of main solution processed solar cells. This concise review is on the recent developments of transition metal oxide HTL in OSCs and PSCs. The paper starts from the discussion of the cation valence and electronic structure of the transition metal oxide materials, followed by analyzing the structure-property relationships of these HTLs, which we attempt to give a systematic introduction about the influences of their cation valence, electronic structure, work ftmction and film property on device performance.

关键词： hole-transporting layer transition metal oxide perovskite solar cell organic solar cell

Effects of transition metal oxides on Thermal Conductivity of Mould Fluxes

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Journal of Iron and Steel Research International 2013年第11期20卷 27-32页

作者： QIU Xin XIE Bing QING Xue-mei DIAO Jiang HUANG Qing-yun WANG Shui-bo College of Materials Science and Engineering Chongqing University Wuhan Iron and Steel Design and Research Institute Engineering Technology Company

The thermal conductivity of the mould fluxes containing transition metal oxides was measured by hotline method at different temperatures. The relationship between the thermal conductivity of mold fluxes and the contents of transition metal oxides was discussed. The synthetic slags were composed of 30.0% - 35.4%CaO, 34.7% - 38.6% SiO2, 6% Al2O3, 9% Na2O, 14.4% CaF2, 0-4% Cr2O3 and 0-8% MnO in mass percent. The results indicated that Cr2O3 and MnO had a negative effect on thermal conductivity of mold fluxes. The thermal conductivity of mold fluxes was about 0.25-0.55 W/（m · K） when the temperature reached 1 300 ℃, and it increased sharply to about 1.32-1.99 W/（m · K） when the temperature reduced from 1300 to 1000 ℃. The thermal conductivity of mold fluxes containing Cr2 O3 and MnO was 10 %- 25% lower than those of original fluxes. The decrease in thermal conductivity was attributed to the change of molecular structure of mold fluxes. In addition, the poor integrity and regulation of polycrystal structure, complexity of crystal structure, and effects of impurities in the boundary and lat- tice distortion leaded to the reduction in the thermal conductivity. Na2 CrO4, Mn2 SiO4 and other minor phases were also found in the samples containing Cr2O3 and MnO, respectively.

关键词： mould flux heat transfer transition metal oxide thermal conductivity

Effect of Elastic Strains on Adsorption Energies of C,H and O on transition metal oxides

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无机材料学报 2024年第11期39卷 1292-1302页

作者： XIE Tian SONG Erhong School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Ceramics Chinese Academy of SciencesShanghai 200050China

Platinum(Pt)-based noble metal catalysts(PGMs)are the most widely used commercial catalysts,but they have the problems of high cost,low reserves,and susceptibility to small-molecule *** metal oxides(TMOs)are regarded as potential substitutes for PGMs because of their stability in oxidizing environments and excellent catalytic *** this study,comprehensive investigation into the influence of elastic strains on the adsorption energies of carbon(C),hydrogen(H)and oxygen(O)on TMOs was *** on density functional theory(DFT)calculations,these effects in both tetragonal structures(PtO_(2),PdO_(2))and hexagonal structures(ZnO,CdO),along with their respective transition metals were systematically *** was identified that the optimal adsorption sites on metal oxides pinpointed the top of oxygen or the top of metal atom,while face-centered cubic(FCC)and hexagonal close-packed(HCP)holes were preferred for the transition ***,under the influence of elastic strains,the results demonstrated significant disparities in the adsorption energies of H and O between oxides and transition *** these differences,the effect of elastic strains on the adsorption energies of C,H and O on TMOs mirrored those on transition metals:adsorption energies increased under compressive strains,indicating weaker adsorption,and decreased under tension strains,indicating stronger *** behavior was rationalized based on the d-band model for adsorption atop a metallic atom or the p-band model for adsorption atop an oxygen ***,elastic strains present a promising avenue for tailoring the catalytic properties of TMOs.

关键词： density functional theory adsorption energy elastic strain engineering transition metal oxide catalyst