作者机构：
[Yi, Liu; Xu, Zhao] School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan, 430023, Hubei, China;[Lisha, Xu] School of Physics, Hubei University, Wuhan, 430062, China;[Yunjun, Mei] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, 430023, Hubei, China;[Luocheng, Chen] Hubei Sino-Australian Nano Material Technology Co., Ltd., Guangshui, 432700, China;[Kuibo, Yin; Anqi, Zheng] SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, Southeast University, Nanjing, 210096, People's Republic of China
摘要：
In the last few decades, nanoparticles have been a prominent topic in various fields, particularly in agriculture, due to their unique physicochemical properties. Herein, molybdenum copper lindgrenite Cu(3)(MoO(4))(2)(OH)(2) (CM) nanoflakes (NFs) are synthesized by a one-step reaction involving α-MoO(3) and CuCO(3)⋅Cu(OH)(2)⋅xH(2)O solution at low temperature for large scale industrial production and developed as an effective antifungal agent for the oilseed rape. This synthetic method demonstrates great potential for industrial applications. Infrared spectroscopy and X-ray diffraction (XRD) results reveal that CM samples exhibit a pure monoclinic structure. TG and DSC results show the thermal stable properties. It can undergo a phase transition form copper molybdate (Cu(3)Mo(2)O(9)) at about 300°C. Then Cu(3)Mo(2)O(9) nanoparticlesdecompose into at CuO and MoO(3) at 791°C. The morphology of CM powder is mainly composed of uniformly distributed parallelogram-shaped nanoflakes with an average thickness of about 30nm. Moreover, the binding energy of CM NFs is measured to be 2.8eV. To assess the antifungal properties of these materials, both laboratory and outdoor experiments are conducted. In the pour plate test, the minimum inhibitory concentration (MIC) of CM NFs against Sclerotinia sclerotiorum (S. sclerotiorum) is determined to be 100ppm, and the zone of inhibiting S. sclerotiorum is 14mm. When the concentration is above 100nm, the change rate of the hyphae circle slows down a little and begins to decrease until to 200ppm. According to the aforementioned findings, the antifungal effects of a nano CM NFs solution are assessed at different concentrations (0ppm (clear water), 40ppm, and 80ppm) on the growth of oilseed rape in an outdoor setting. The results indicate that the application of CM NFs led to significant inhibition of S. sclerotiorum. Specifically, when the nano CM solution was sprayed once at the initial flowering stage at a concentration of 80ppm, S. sclerotiorum growth was inhibited by approximately 34%. Similarly, when the solution was sprayed once at the initial flowering stage and once at the rape pod stage, using a concentration of 40ppm, a similar level of inhibition was achieved. These outcomes show that CM NFs possess the ability to bind with more metal ions due to their larger specific surface area. Additionally, their semiconductor physical properties enable the generation of reactive oxygen species (ROS). Therefore, CM NFs hold great potential for widespread application in antifungal products.
作者：
Ke Liu;Hongchao Ma*;Liang Zhang;Lu Gao;Shitao Xiang;...
期刊：
Automation in Construction,2024年160:105321 ISSN：0926-5805
通讯作者：
Hongchao Ma
作者机构：
[Ke Liu; Lu Gao; Shitao Xiang; Dachang Chen; Qing Miao] School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430048, PR China;[Hongchao Ma] School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, PR China;[Liang Zhang] Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, PR China
通讯机构：
[Hongchao Ma] S;School of Remote Sensing and Information Engineering, Wuhan University, Wuhan 430079, PR China
摘要：
It is challenging to extract satisfactory building outlines from LiDAR data due to the unorganized point cloud and complex building shapes. To solve the issues, a method using adaptive tracing alpha shapes (ATAS) and contextual topological optimization is proposed. First, the ATAS method is used to extract sequential boundary points. After that, a method based on point cloud distribution analysis is developed to obtain building dominant directions and line segments of outlines. Finally, regularized outlines are obtained by adjusting all line segments simultaneously under the framework of global energy optimization that considers the geometric errors and contextual geometric relationships between adjacent line segments. Experimental results verify that the proposed ATAS method can efficiently extract sequential boundary points with a minimum 98.49% correctness. In addition, the extracted outlines are attractive and the minimum values of the RMSE, PoLiS, and RCC metrics of the extracted outlines are 0.48 m, 0.44 m, and 0.31 m, respectively, showing the effectiveness of the proposed method.
摘要：
建筑物轮廓线是各类应用的数据源，但散乱、不规则激光点云数据给轮廓线提取带来了难度。针对上述问题，提出一种基于多层级最小外包矩形规则建筑物轮廓线提取方法，首先使用迭代区域增长算法对轮廓点进行分组，根据点数最多的一组确定初始最小外包矩形。再对初始最小外包矩形进行多层级分解，使轮廓点与不同层级最小外包矩形重合，最后根据不同层级最小外包矩形生成轮廓线。使用Vaihingen城区中规则建筑物进行实验，实验结果表明：与最小面积方法与最大重叠度方法相比，所提方法能准确确定初始最小外包矩形，且提取效率得到略微提高。提取的轮廓线角点均方根误差为0.71 m，优于其他4种方法。所提方法可快速提取规则建筑物轮廓线，有利于后续三维重建。 Building outlines serve as data sources for various applications. However, accurately extracting outlines from scattered and irregular point clouds presents a challenge. To address this issue, a method utilizing the concept of the multi-level minimum bounding rectangle (MBR) is proposed for extracting precise outlines of regular buildings. Initially, the boundary points are segmented into groups using an iterative region growing technique. Subsequently, the group with the maximum boundary points is utilized to identify the initial MBR. The initial MBR is then decomposed into multi-level rectangles, ensuring that the boundary points align with rectangles of different levels. Ultimately, the outlines are generated using the multi-level MBR approach. To evaluate the effectiveness of the proposed method, experiments were conducted on regular buildings in Vaihingen. The results demonstrate that the proposed method achieves an accurate initial MBR with a slightly enhanced efficiency compared to the minimum area and the maximum overlapping methods. The root mean square errors of the extracted outline corners measure 0.71 m, surpassing the performance of four other comparison methods. In conclusion, the proposed method enables the effective extraction of outlines from regular buildings, providing a valuable contribution to subsequent three-dimensional reconstruction tasks.
作者机构：
[Deng-Wei Zhang] Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, P. R. China;[Li-Li Zheng] Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education, Jianghan University, Wuhan 430074, Peoples Republic of China;[Mei Wang] School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430040, P. R. China;[Yuan Zhou] School of Electrical and Information Engineering, Hubei Key Laboratory of Energy Storage and Power Battery, Hubei University of Automotive Technology, Shiyan 442002, P. R. China;[Xin-You Lü] School of Physics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
摘要：
We investigate theoretically the chaotic dynamics in an optomechanical system composed of coupled optical resonators. We find that introducing additional loss through a nanotip can induce chaotic motion. The underlying reason for this unconventional phenomenon lies in steering the system parameters via an additional loss that can bring the system to the vicinity of a chaotic regime, which dynamically enhances the optomechanical nonlinearity and suppresses the negative influence of loss, giving rise to the emergence of chaotic motion. Our work may open a different avenue for designing and developing chaotic systems in optomechanics and provide theoretical guidance for chaotic secure communication.
期刊：
Colloids and Surfaces A: Physicochemical and Engineering Aspects,2024年688:133671 ISSN：0927-7757
通讯作者：
Pengfei Jia
作者机构：
School of Electrical Engineering, Guangxi University, Nanning, China;School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan, China;Guangxi Key Laboratory of intelligent Control and Maintenance of Power Equipment, Guangxi University, Nanning, China;[Jianjun Cao; Mingxiang Wang] School of Electrical Engineering, Guangxi University,Nanning,China<&wdkj&>Guangxi Key Laboratory of intelligent Control and Maintenance of Power Equipment, Guangxi University,Nanning,China;[Yiyi Zhang; Jiefeng Liu; Pengfei Jia] School of Electrical Engineering, Guangxi University,Nanning,China
通讯机构：
[Pengfei Jia] S;School of Electrical Engineering, Guangxi University, Nanning, China
摘要：
Insulation performance testing of gas-insulated switchgear (GIS) and treatment of SF6 decomposition products under partial discharge are two crucial studies. In this paper, the adsorption behavior and sensor properties of five characteristic decomposition gases of SF6 (HF, H2S, SO2, SOF2, SO2F2) on intrinsic and CoO-doped SnSe monolayers are investigated in detail based on density-functional theory. The results showed that the adsorption behaviors of HF, H2S, SOF2 and SO2F2 on SnSe monolayers were all physisorption among which the best adsorption was SO2 with an adsorption energy of −0.618 eV, which is a weak chemisorption. After doping with CoO, the adsorption capacity of SnSe monolayer for five gases was significantly enhanced, in which the adsorption energies for SO2 and SOF2 reached −1.356 eV and −1.175 eV, respectively. In addition, the conductivity of the system is greatly improved, with the bandgap changing from 1.129 eV to 0 eV. The microscopic mechanism of the interaction of gas molecules with CoO-SnSe monolayers has been revealed by energy band structure (Eg), density of states (DOS), Milligan charge analysis ( ∆Q) and electrostatic potential. Finally, the sensitivity (S) and desorption time ( τ) of the five adsorption systems were calculated to illustrate the macroscopic gas-sensitive properties of the system. This work will help to explore the application of CoO-SnSe monolayers in SF6 decomposition gas sensing detection and adsorption treatment.
关键词：
air decomposition pollutants;MoS2;ZnO;TiO2;gas sensor;DFT
摘要：
When partial discharges occur in air-insulated equipment, the air decomposes to produce a variety of contamination products, resulting in a reduction in the insulation performance of the insulated equipment. By monitoring the concentration of typical decomposition products (CO, NO, and NO(2)) within the insulated equipment, potential insulation faults can be diagnosed. MoS(2) has shown promising applications as a gas-sensitive semiconductor material, and doping metal oxides can improve the gas-sensitive properties of the material. Therefore, in this work, MoS(2) has been doped using the popular metal oxides (ZnO, TiO(2)) of the day, and its gas-sensitive properties to the typical decomposition products of air have been analyzed and compared using density functional theory (DFT) calculations. The stability of the doped system was investigated using molecular dynamics methods. The related adsorption mechanism was analyzed by adsorption configuration, energy band structure, density of states (DOS) analysis, total electron density (TED) analysis, and differential charge density (DCD) analysis. Finally, the practical application of related sensing performance is evaluated. The results show that the doping of metal oxide nanoparticles greatly improves the conductivity, gas sensitivity, and adsorption selectivity of MoS(2) monolayer to air decomposition products. The sensing response of ZnO-MoS(2) for CO at room temperature (25 °C) reaches 161.86 with a good recovery time (0.046 s). TiO(2)-MoS(2) sensing response to NO(2) reaches 3.5 × 10(6) at 25 °C with a good recovery time (0.108 s). This study theoretically solves the industrial challenge of recycling sensing materials and provides theoretical value for the application of resistive chemical sensors in air-insulated equipment.
摘要：
Two-dimensional transition metal disulfides (TMDs) heterojunction is a very promising non-precious metal catalyst that has been widely used as a catalyst for hydrogen evolution reactions. In this paper, the effects of different positions of Se vacancies on the electronic structure and hydrogen evolution reaction electrocatalyst of MoSe2/WSe2 heterojunction are investigated by first-principles calculations. After the introduction of vacancy, defect states appear between the conduction band bottom and the Fermi energy level of the heterojunction. This is more favorable for the electron transfer between H and the substrate. The results of the density of states calculations indicate that the defect states appear because the d orbitals of the transition metal atoms containing the Se vacancy layer hybridize with the p orbitals of the Se atoms. The differential charge density indicates that the Se vacancies promote the charge transfer of MoSe2/WSe2. In addition, calculations of the Gibbs free energy for the hydrogen evolution reaction of heterojunctions show that Se vacancies (especially the outer vacancies) enhance the electrocatalytic hydrogen precipitation performance of heterojunctions. The results provide a new way to regulate the hydrogen evolution properties of MoSe2/WSe2 heterojunctions.
作者机构：
[Yintong Zhou; Jiayao Mao; Haoran Zhang; Jiaxing Wang; Yan Yang; Feng Ma; Rongsheng Chen] The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China;[Xiaohui Ren; Hongwei Ni] The State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferous Metalurgy and Resources Utilization of Ministry of Education & Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel making, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China;[Xusheng Wang] School of Materials Science and Engineering, Zhejiang Sci-Tech University, Hangzhou 310018, China;[Huating Liu] School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430023, China;[Ningdong Feng] State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China & University of Chinese Academy of Sciences, Beijing 100049, PR China
通讯机构：
[Xiaohui Ren; Rongsheng Chen] T;The State Key Laboratory of Refractories and Metallurgy, Institute of Advanced Materials and Nanotechnology, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China<&wdkj&>The State Key Laboratory of Refractories and Metallurgy, Key Laboratory for Ferous Metalurgy and Resources Utilization of Ministry of Education & Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steel making, Faculty of Materials, Wuhan University of Science and Technology, Wuhan 430081, China
摘要：
Copper-based catalysts have been extensively investigated for electrocatalytic reduction of CO2 owing to their unique capabilities. To our notice, organic molecules can be employed as molecular modifiers to tailor the CO2 reduction selectivity of Cu-based catalysts. Herein, three kinds of molecular modifiers, pyridine, triethylamine, and potassium hydroxide have been utilized for fabricating Cu-based electrocatalysts. Experimental investigations reveal that pyridine as molecular modifiers have the ability to alter the surface active sites of the Cu-based catalysts. The modification can facilitate the conversion of CO2 into HCOOH. Notably, the highest Faradaic efficiency achieved in our tests for HCOOH can reach to an impressive value of 80.2 %. Moreover, the catalyst maintains its structure and performance with high stability that exceeding 10 h at a current density of 30 mA cm−2 (-1.1 V vs. RHE). Based on structural characterization and theoretical calculations, we propose that the pyridine molecule can facilitate CO2 accumulation, and the pyridine modification of the CuO/Cu(OH)2 surface active site can reduce the reaction energy barrier for the electrocatalytic reduction of CO2 to HCOOH.
摘要：
While highly sensitive elastic strain sensors have been widely investigated, the time-dependent stress sensitivity of viscoelastic MWCNT/polyethylene nanocomposite stress sensors remains to be explored. In this paper, we develop an electromechanically coupled homogenization scheme to reveal the time-dependent stress sensing performances of viscoelastic MWCNT/polyethylene nanocomposite sensors. In the time-dependent context, the complex moduli and electrical conductivity are selected as the dual homogenization parameters. The time-dependent stress sensitivity is illustrated through the viscoelastic imperfect interface connection and stress-induced tunneling distance. The predicted stress sensing capacities of viscoelastic MWCNT/polyethylene nanocomposite stress sensors are shown to be consistent with the experiments under the constant stress loading. It reveals that the stress sensitivity factor increases with the loading time under constant stress. The optimal MWCNT aspect ratio for high sensing capacities exhibits an increasing trend regarding the MWCNT volume fraction. The uncovered sensing characteristics can provide microstructural design guidance in high-performance nanocomposite stress sensors.
关键词：
Air discharge pollutants;Single-walled CNT;Geometric structure;Gas adsorption;DFT
摘要：
Air is a good insulating medium under normal conditions. The insulation performance of many electrical equipment is closely related to air. The detection of air decomposition pollutants is considered to be one of the effective ways to diagnose the fault of air insulated power equipment. Based on the first-principles, the adsorption and sensing characteristics of Single-walled CNT modified by transition metal clusters (Crn) for air discharge pollutants (CO, NOx) were analyzed. Firstly, through the modeling and analysis of different doping sites, four most stable models of Crn doped SWCNT are obtained, and their resistance is briefly analyzed. On the basis of these four configurations, the most stable adsorption configurations were found. The corresponding adsorption energy, adsorption distance and transfer charge are obtained. Then, the differential charge density, frontier molecular orbitals, adsorption selectivity and desorption properties of each system were analyzed. The result is that Crn-SWCNT surface has a good adsorption capacity for pollutants. The theoretical recovery time is not ideal at room temperature. However, CO can be rapidly desorbed from the surface of Crn-SWCNT at extremely high temperatures. Interestingly, Crn-SWCNT can be used as solid adsorption materials for purifying CO, NOx. This work provides a new idea for clean air to treat air discharge pollutants.
摘要：
This paper presents a stepped electromagnetic bandgap(EBG) hosted on the T-shaped stepped stub with an inverted H-shaped slot etched on the ground to enhance bandwidth and improve isolation for a compact UWB-MIMO antenna developed from our previous design. The characteristic mode analysis is used to offer physical insight into the operation phenomena taking place in the evolution of antenna. The proposed antenna has a compact size of $27\times 22\times 0.8$ mm and realize bandwidth from 3.07 GHz to 11.1 GHz, keeping the isolation more than 20 dB. Key parameters evaluating the antenna performance like radiation pattern, gain, radiation efficiency above 75% and envelope correlation coefficient below 0.05 are investigated. The simulated and measured results agree well, testifying the proposed MIMO antenna is a suitable candidate for UWB applications.
通讯机构：
[Fang, C ] W;Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430023, Peoples R China.
关键词：
Flowering plants;Feature extraction;Image color analysis;Convolutional neural networks;Computational modeling;YOLO;Real-time systems;Image recognition;Agricultural products;Tomato flower fruit recognition;C3Faster;convolutional neural networks;lightweight
摘要：
In order to monitor the growth and development of tomatoes, and improve the efficiency of flower and fruit thinning and tomato picking, this paper constructs a tomato flower and fruit dataset and proposes a TF-YOLOv5s model for the detection of tomato flowers and fruits in natural environments. Based on the YOLOv5s model, a C3Faster module is introduced to reduce the number of parameters and calculations while maintaining detection accuracy. The regular convolution is replaced by depth-wise separable convolution (DWConv) to avoid parameter redundancy. To improve the convergence and accuracy of the model, this paper replaces Complete Intersection over Union (CIoU) loss with Efficient Intersection over Union (EIoU) loss. The Squeeze-and-Excitation (SE) module is added to improve the model’s sensitivity to the features of the tomato flowers and fruits. Compared with the baseline model, the number of parameters is reduced by 54.5%, the weight file is reduced by 52.8%, the Floating-point Operation Per second (FLOPs) is reduced by 48.7%. The detection accuracy of tomato flowers and fruits mAP@0.5 has improved by 1.4% and 1.2% respectively. TF-YOLOv5s is used to detect three types of targets: tomato flowers, red tomatoes, and green tomatoes, and mAP@0.5 of which can reach as high as 95.2%. Furthermore, the improved algorithm is deployed on two edge computing devices to verify its effectiveness. Experimental results show that the algorithm in this paper can achieve high detection with less computational resources. This algorithm has the potential value of application in practical tomato production.
作者：
Yang Xu;Mingxiang Wang;Yiyi Zhang;Dachang Chen;Min Xu;...
期刊：
Surfaces and Interfaces,2024年46:104077 ISSN：2468-0230
通讯作者：
Pengfei Jia
作者机构：
[Yang Xu; Mingxiang Wang; Yiyi Zhang; Pengfei Jia] School of Electrical Engineering, Guangxi University, Nanning 530004, China;[Dachang Chen] School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 530004, China;[Min Xu] College of Food Science and Bioengineering, Xihua University, Chengdu 610039, China;[Changyou Ma] Data Recovery Key Laboratory of Sichuan Province, Neijiang Normal University, Neijiang 641100, China
通讯机构：
[Pengfei Jia] S;School of Electrical Engineering, Guangxi University, Nanning 530004, China
摘要：
Currently, CF3SO2F shows great potential as a green insulating gas to replace SF6 in the electrical industry to support the dual-carbon program. However, it has the potential to undergo partial discharges and thus decomposition under the operating voltage of the power grid, and the gas-sensitive detection technique is an effective method to diagnose this problem. In this work, the gas-sensitive properties of the Cr2@g-CN interface for each harmful gas molecule were investigated from a microscopic point of view, using the harmful gases (SO2, HF, SO2F2, CF4) that may be produced by CF3SO2F as the detection targets. Then, the performance of Cr2@g-CN interface as a gas sensor material in practical applications was predicted. The final results revealed that the Cr2@g-CN interface is most suitable as a potential gas-sensitive material for SO2 gas sensors. The exploration of humidity effects suggests that Cr2@g-CN remains a promising SO2 gas sensing material for practical applications in specific humidity environments. This work reveals the origin of the excellent properties of Cr2@g-CN as a gas sensor material and provides new ideas for the detection of CF3SO2F decomposition products.
期刊：
Digital Signal Processing,2024年144:104288 ISSN：1051-2004
通讯作者：
Ou, WH
作者机构：
[Xiong, Jiahao; Ou, Weihua; Ou, WH; Chen, Longbao; Han, Jie] Guizhou Normal Univ, Sch Big Data & Comp Sci, Guiyang 550025, Peoples R China.;[Zeng, Wu] Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430000, Peoples R China.;[Gou, Jianping] Southwest Univ, Coll Comp & Informat Sci, Coll Software, Chongqing 400715, Peoples R China.
通讯机构：
[Ou, WH ] G;Guizhou Normal Univ, Sch Big Data & Comp Sci, Guiyang 550025, Peoples R China.
关键词：
Face video;Heart rate;Remote photoplethysmography;Group sparse representation
摘要：
Non-contact heart rate measurement based on face video is rapidly developed due to its comfort and wide application. However, it is difficult to extract the pulse signals for non-contact heart rate measurement due to the various interference factors, such as illumination variation, head motion and face expression. In this paper, we propose group sparse representation to reconstruct the pulse signals, then estimate the heart rate based on the fact that the real heart rate is consistent at the same time from different sub-regions. Specifically, we formulate the reconstruction of pulse signals as group sparse representation problem and require the raw signals of all the sub-regions to be similar sparse representation. Firstly, we use the face detection algorithm to obtain the region of interest (ROI) and divide it into sub-regions, followed by the distortion compensation of color signals from different sub-regions. Then we extract the sub-region chrominance signals and select the high-quality chrominance signals to construct the raw pulse signals matrix. After that, we construct a mixed pulse dictionary containing discrete cosine bases and wavelet bases considering the periodicity and pulsatility of the pulse signals. Finally, we conduct group sparse representation to reconstruct the pulse signals and estimate the heart rate via spectral analysis based on the reconstructed pulse signals. Experimental results on three public datasets show that this method outperforms most existing heart rate measurement methods.
摘要：
The magnetization and magnetostriction properties of Mn1_xMgxV2O4 (x = 0.00, 0.10, 0.15, 0.20) single crystals have been investigated under both static and pulsed magnetic fields, in which the magnetization and magnetostriction behaviors exhibit field-sweep-rate dependence, which are related to the spin-orbital-lattice coupling in these systems. Especially, anomalous enhancement of spin-orbital correlation was observed for x = 0.15. We attribute this enhancement to the tuning on the canting angle of V3+ ions by Mg2+-ions substitution. Furthermore, while the inter-vanadium distance RV-V is important to determine the evolution of the properties in the doped cases proposed by many studies, our result suggests that RV-V is not always dominant, the spin-orbital correlation effect can survive from the disordering induced by the variation of RV-V and even be enhanced at proper doping level.
作者机构：
[Guo, Siqi; Cheng, Ningyan; Ge, Binghui; Zhang, Jialin] Anhui Univ, Inst Phys Sci & Informat Technol, Informat Mat & Intelligent Sensing Lab Anhui Prov, Key Lab Struct & Funct Regulat Hybrid Mat,Minist, Hefei 230601, Peoples R China.;[Ren, Long; Ji, Yuan] Wuhan Univ Technol, Int Sch Mat Sci & Engn, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.;[Liu, Huating] Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430023, Peoples R China.;[Yang, Ming] Beihang Univ, Sch Phys, Beijing 100191, Peoples R China.
通讯机构：
[Cheng, NY; Ge, BH ] A;[Ren, L ] W;Anhui Univ, Inst Phys Sci & Informat Technol, Informat Mat & Intelligent Sensing Lab Anhui Prov, Key Lab Struct & Funct Regulat Hybrid Mat,Minist, Hefei 230601, Peoples R China.;Wuhan Univ Technol, Int Sch Mat Sci & Engn, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China.
关键词：
carbothermal reduction;electrocatalysts;in situ;structure evolution;transmission electron microscopy
摘要：
Atomic understanding of a chemical reaction can realize the programmable design and synthesis of desired products with specific compositions and structures. Through directly monitoring the phase transition and tracking the dynamic evolution of atoms in a chemical reaction, in situ transmission electron microscopy (TEM) techniques offer the feasibility of revealing the reaction kinetics at the atomic level. Nevertheless, such investigation is quite challenging, especially for reactions involving multi-phase and complex interfaces, such as the widely adopted carbothermal reduction (CTR) reactions. Herein, in-situ TEM is applied to monitor the CTR of Co3O4 nanocubes on reduced graphene oxide nanosheets. Together with the first-principle calculation, the migration route of Co atoms during the phase transition of the CTR reaction is revealed. Meanwhile, the interfacial edge-dislocations/stress-gradient is identified as a result of the atomistic diffusion, which in turn can affect the morphology variation of the reactants. Accordingly, controllable synthesis of Co-based nanostructure with a desirable phase and structure has been achieved. This work not only provides atomic kinetic insight into CTR reactions but also offers a novel strategy for the design and synthesis of functional nanostructures for emerging energy technologies.
