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Post-treatment by an ionic tetrabutylammonium hexafluorophosphate for improved efficiency and stability of perovskite solar cells

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能源化学 2022年第1期64卷 8-15页

作者： Chaoqun Zhang Xiaodong Ren Xilai He Yunxia Zhang Yucheng Liu Jiangshan Feng Fei Gao Ningyi Yuan Jianning Ding Shengzhong (Frank) Liu Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina School of Materials Science and Engineering Jiangsu Collaborative Innovation Center for Photovoltaic Science and EngineeringJiangsu Province Cultivation base for State Key Laboratory of Photovoltaic Science and TechnologyChangzhou UniversityChangzhou 213164JiangsuChina Micro/Nano Science and Technology Center Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Applied Surface and Colloid Chemistry Ministry of EducationShaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710119ShaanxiChina Dalian National Laboratory for Clean Energy iChEMDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina University of the Chinese Academy of Sciences Beijing 100039China

Interface engineering is an effective way to improve efficiency and long-term stability of perovskite solar cells (PSCs).Herein,an ionic compound tetrabutylammonium hexafluorophosphate (TP6) is adopted to passivate surface defects of the perovskite *** is found that TP6 effectively reduced the surface defects,especially at the grain boundaries where the defects are ***,the exposed long alkyl chains and fluorine atoms in the TP6 enhanced the moisture stability of the perovskite film due to its strong *** addition,the driving force of charge carrier separation and transport is increased by enlarged built-in ***,the power conversion efficiency (PCE) of PSCs is significantly improved from 20.59％ to 22.41％ by increased open-circuit vcltage (Voc) and fill factor(FF).The unencapsulated device with TP6 treatment exhibits better stability than the control device,and the PCE retains ～ 80％ of its initial PCE after 30 days under 15％-25％ relative humidity in storage,while the PCE of the control device declines by more than 50％.

关键词： Perovskite solar cell Interface engineering High hydrophobicity Ionic compound

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An intuitive and accurate EMI model for a modular multilevel converter

An intuitive and accurate EMI model for a modular multilevel...

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2020 IEEE International Conference on Information technology, Big Data and Artificial Intelligence, ICIBA 2020

作者： Liu, Mingjie Liu, Jianben Wang, Xuehua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China State Key Laboratory of Power Grid Environmental Protection Wuhan China

ISBN: (纸本)9781728152240

Modular multilevel converter (MMC) has numerous sub-modules (SMs) that are complex electromagnetic interference (EMI) sources. It poses a challenge on the EMI analysis of MMC. Motivated by the challenge, this article presents an intuitive and accurate EMI model of MMC based on the superposition theorem. The stray parameters of MMC system are extracted to characterize the high-frequency characteristics of the circuit. By modeling the SMs as individual EMI sources, an EMI equivalent circuit is derived which can intuitively tell the conducted EMI principles of MMC. The EMI model based on the EMI equivalent circuit can accurately predict the EMI results of MMC without a great deal of calculation. Simulation results verify the effectiveness and validity of the proposed EMI model. © 2020 IEEE.

关键词： Equivalent circuits

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Electrically variable interfaces in polymer nanocomposite dielectrics

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Physical Review B 2024年第18期109卷 184205-184205页

作者： Wen-Zhi Luo Zhong-Hui Shen Yang Shen Long-Qing Chen Ce-Wen Nan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center of Smart Materials and Devices Wuhan University of Technology Wuhan 430070 China School of Materials and Microelectronics Wuhan University of Technology Wuhan 430070 China School of Materials Science and Engineering State Key Lab of New Ceramics and Fine Processing Tsinghua University Beijing 100084 China Department of Materials Science and Engineering The Pennsylvania State University University Park Pennsylvania 16802 United States

Polymer nanocomposites generally exhibit unexpected dielectric/electrical performance far beyond the sum of every component, which is mainly due to the interface effect induced by the differences in structures and properties between the nanofillers and the polymer matrix. However, understanding the capricious interface effect in different polymer nanocomposites remains a major challenge. Here, we perform density functional theory calculations to investigate the atomic/molecular configurations and local charge behaviors of heterogeneous interfaces between the fillers of perovskites, oxides, two-dimensional materials, and polar/nonpolar polymers. Our findings demonstrate that atomic reconfiguration takes place during the formation of the inorganic/organic interface in order to minimize the overall energy of the system. Significant charge accumulation occurs at heterogeneous interfaces due to electron redistribution, especially for the examples of HfO2 and negatively charged Ca2Nb3O10. When applying an electric field, local polarization, especially around the interface, will be distorted and enhanced as a result of interfacial interaction. Even for the nonpolar polymer with linear dielectric oxides such as TiO2, induced dipole moments also appear near the interface, leading to the improvement of overall polarizability. The outcomes of our study verify that the variable electrical behaviors at the interfaces are highly dependent on the feature of every component constituting the inorganic/organic interface, which offers valuable insights for optimizing the experimental design of heterogeneous interfaces in polymer nanocomposites.

关键词： Electric polarization Solid-solid interfaces Density functional calculations

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A Stable RTK/MEMS-IMU Tightly-Coupled Algorithm under Differential Corrections Outage

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IEEE Transactions on Vehicular technology 2025年

作者： Bian, Yougang Cao, Shipeng Wang, Guangcai Qin, Xiaohui Hu, Manjiang Qin, Hongmao Hunan University State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle College of Mechanical and Vehicle Engineering Changsha410082 China Hunan University Wuxi Intelligent Control Research Institute Wuxi214115 China

The GNSS-RTK and MEMS-IMU integrated navigation system is a commonly used high-precision, low-cost solution for outdoor positioning. However, the significant measurement error of MEMS-IMU can rapidly lead to divergence in navigation state predictions based on inertial error propagation models. To overcome this limitation and enhance accuracy, maintaining the continuity of RTK measurement information is crucial. Nevertheless, due to the instability of wireless transmission links and communication equipment, or disruptions in base station observations, differential corrections often experience outages, resulting in a decline in measurement information quality and affecting the accuracy of integrated navigation. Therefore, this paper proposes a stable RTK/MEMS-IMU tightly coupled algorithm. During outages of differential corrections, the proposed algorithm utilizes historical differential corrections from the base station along with real-time rover station information to construct a stable double-difference carrier phase vector. This approach ensures the stability of measurement information and enhances positioning accuracy. Simulation results have verified the effectiveness of this method, and land tests have demonstrated that, compared to the traditional RTK/MEMS-IMU tightly coupled algorithm, the position and velocity accuracy of this algorithm during outages of differential corrections have been improved by 29.5% and 18.4%, respectively. © 1967-2012 IEEE.

关键词： Base stations

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Theoretical Perspectives on Natural and Artificial Micro-swimmers

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Acta Mechanica Solida Sinica 2021年第6期34卷 783-809页

作者： Jinan Liu Yiqiang Fu Xiongjun Liu Haihui Ruan Research Center for Fluid-Structure Interactions Department of Mechanical EngineeringThe Hong Konssg Polytechnic UniversityHung HomKowloonHong KongChina State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083China

The observations of microorganisms revealed how they *** inspired by them,studies on artificial micro-robots with various actuation mechanisms have been *** elucidate the essential concepts in understanding the dynamic behaviors of natural and artificial micro-swimmers—so as to control the latter in future applications,in this paper,we summarize the historical achievements and describe our theoretical *** first introduce the studies on microorganisms and their propulsion *** reviewing the basic principles and the development of the understanding of them,we take the flagellated micro-swimmers as an example to elaborate on the theories of their *** review the progress in actuation strategies of artificial flagellated micro-swimmers and then propose two possible strategies to realize the turning of a flagellated micro-swimmer—the key step toward steerability through remote ***,we describe the inadequacies of the investigations on this topic and our perspectives on future developments.

关键词： Natural micro-swimmer Artificial micro-swimmer External field actuation Manipulation strategies Propulsion

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A Prediction Model for Time Series of Dissolved Gas Content in Transformer Oil Based on LSTM

A Prediction Model for Time Series of Dissolved Gas Content ...

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2020 International Conference on Ubiquitous Power Internet of Things, UPIOT 2020 and 4th International Symposium on Green Energy and Smart Grid, SGESG 2020

作者： Hu, Chuye Zhong, Yang Lu, Yiqi Luo, Xiaotong Wang, Shaorong State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan Hubei Province430074 China

By combining with dissolved gas analysis, time series prediction of dissolved gas content in oil provides a basis for transformer fault diagnose and early warning. In the view of that, a prediction model based on long short time memory (LSTM) network for time series of dissolved gas content in oil is proposed, which takes advantage of LSTM network's ability to deal with long-sequence prediction problems. Five characteristic gas concentrations are used as input to the model, and the hyper parameters of the model is optimized by Bayesian optimization algorithm to further improve prediction accuracy, then a LSTM prediction model is constructed. By case study, it is verified that the proposed model can precisely predict time series of dissolved gas content. Compared with gray model, BP neural network and support vector machine, the proposed model has higher prediction accuracy and can better track the trend of time series of dissolved gas content in oil. © Published under licence by IOP Publishing Ltd.

关键词： Forecasting

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Evolution in wear, corrosion, and tribocorrosion behavior of Ni-based alloys induced by Mn addition

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Wear 2025年 570卷

作者： Chen, Jia Lu, Wenlan Dai, Pinqiang Wen, Xiaochun Wang, Zhenjun Fan, Hengzhong Chen, Hongxiang Zhang, Yongsheng School of Materials Science and Engineering Fujian University of Technology Fuzhou350118 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou350118 China

Ni-based alloys have attracted much attention due to their exceptional mechanical and corrosion properties. The combination of these excellent properties has increased researchers’ interest in studying passivation mechanism during corrosion and tribocorrosion. In the present study, the effects of Mn addition (Mn = 0, 5, 10, and 20 at.%) on wear, corrosion, and tribocorrosion behavior of Ni-based alloys were investigated under room temperature. The microstructures of as-fabricated and post-test Ni alloys were characterized by X-ray diffraction and scanning electron microscopy. The elemental distribution and chemical states in worn and unworn areas were identified by using energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The addition of Mn in the alloy was found to increase wear and tribocorrosion resistance. Pitting potential of Mn-free alloys was higher than that of Mn-containing alloys, reducing from 0.56 V to −0.05 V. Higher Mn concentration in the alloy offered a wear-induced corrosion during tribocorrosion process. In addition, substituting Cr with Mn content can promote the passivation of Ni, which was confirmed by X-ray photoelectron spectroscopy. Although Ni-Mn alloys does not passivate thermodynamically, passive layers can be found by transmission electron microscopy analysis due to the formation of metastable oxide phases. © 2025 Elsevier B.V.

关键词： X ray photoelectron spectroscopy

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Ultrafine Fe/Fe3C decorated on Fe-N_(x)-C as bifunctional oxygen electrocatalysts for efficient Zn-air batteries

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Journal of Energy Chemistry 2021年第5期30卷 72-79页

作者： Lingbo Zong Xin Chen Siliang Liu Kaicai Fan Shuming Dou Jie Xu Xiaoxian Zhao Wenjun Zhang Yaowen Zhang Weicui Wu Fenghong Lu Lixiu Cui Xiaofei Jia Qi Zhang Yu Yang Jian Zhao Xia Li Yida Deng Yanan Chen Lei Wang Taishan Scholar Advantage and Characteristic Discipline Team of Eco Chemical Process and Technology Key Laboratory of Optic-electric Sensing and Analytical Chemistry fo r Life ScienceMOEState Key Laboratory of Eco-chemical EngineeringCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042ShandongChina School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin Key Laboratory of Composite and Functional MaterialsTianjin UniversityTianjin 300072China Centre for Clean Environment and Energy School of Environment and ScienceGriffith UniversityQueensland 4222Australia College of Science Hebei Agricultural UniversityBaoding 071001HebeiChina Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-PlasticsQingdao University of Science and TechnologyQingdao 266042ShandongChina College of Materials Science and Engineering Qingdao University of Science&TechnologyQingdao 266042ShandongChina

Efficient bifunctional oxygen electrocatalysts for ORR and OER are fundamental to the development of high performance metal-air ***,a facile cost-efficient two-step pyrolysis strategy for the fabrication of a bifunctional oxygen electrocatalyst has been *** efficient non-preciousmetal-based electrocatalyst,Fe/Fe_(3)C@Fe-N_(x)-C consists of highly curved onion-like carbon shells that encapsulate Fe/Fe_(3)C nanoparticles,distributed on an extensively porous graphitic carbon *** obtained Fe/Fe_(3)C@Fe-N_(x)-C aerogel exhibited superb electrochemical activity,excellent durability,and high methanol *** experimental results indicated that the assembly of onion-like carbon shells with encapsulated Fe/Fe_(3)C yielded highly curved carbon surfaces with abundant Fe-Nxactive sites,a porous structure,and enhanced electrocatalytic activity towards ORR and OER,hence displaying promising potential for application as an air cathode in rechargeable Zn-air *** constructed Zn-air battery possessed an exceptional peak power density of~147 mW cm^(-2),outstanding cycling stability(200 cycles,1 h per cycle),and a small voltage gap of 0.87 *** study offers valuable insights regarding the construction of low-cost and highly active bifunctional oxygen electrocatalysts for efficient air batteries.

关键词： Non-precious metal Nitrogen-rich carbon Fe/Fe_(3)C Fe-N_(x)-C Bifunctional oxygen electrocatalysts

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Revolutionizing Wearable:Multicolored Photochromic Fiber Opens New Frontiers in Human–Machine Interaction

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advanced Fiber Materials 2024年第3期6卷 619-621页

作者： Jing Zhang Zhigang Xia Perry Ping Shum School of Mechanical Engineering and Electronic Information China University of Geosciences(Wuhan)Wuhan 430074China State Key Laboratory of New Textile Materials and Advanced Processing Technologies School of Textile Science and EngineeringTextile Industry Key Laboratory of Yarn and Its FunctionalizationWuhan Textile UniversityWuhan 430200China Department of Electronic and Electrical Engineering Southern University of Science and TechnologyShenzhen 518055China

Substantial challenges remain in developing fiber devices to achieve uniform and customizable photochromic lighting effects using lightweight hardware.A recent publication in Light Science&Application,spearheaded by ***-Qing Lu and *** Tao presents a methodical approach to surmount the limitations in photochromic *** integrated controllable photochromic fibers into various wearable devices,providing a promising path for future exploration and advancement in the field of human–machine interaction.

关键词： Multicolored photochromic fiber Wearable device Fiber thermal drawing process Human–machine interaction

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Achieving High-Strength Porous Tungsten with Wide Porosity Range Via Selective Dissolution W-Ti-Fe Precursor

SSRN

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SSRN 2024年

作者： Jia, Hao Zhang, Jian Ge, Shuai Zhu, Bing Liu, Ruxia Wu, Dongshuang Luo, Guoqiang Shen, Qiang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering Nanyang Technological University Singapore639798 Singapore

Porous tungsten with wide porosity variation is considered a candidate for high-energy X-ray flash radiography. This work combines tape casting and dealloying to selectively dissolve a W-Ti-Fe precursor, achieving high-strength porous tungsten with a wide porosity range. The PVB exists on the surface of particles in the form of an amorphous carbon film after pyrolysis, providing conditions for the W-Fe-C interface reaction. The porosity of porous tungsten is 50.7~80.4%. The compressive strengths of porous tungsten with porosity of 50.7% and 80.4% are 221.9 MPa and 10.6 MPa, respectively. The dissolution of the Ti located in the ligament can enhance the porosity of porous tungsten. The coating composed of the solid solution formed at the interface of W and Ti during heat treatment and Fe3W3C can enhance the ligament strength. This work provides a theoretical reference for preparing porous tungsten with a wide porosity range and high performance. © 2024, The Authors. All rights reserved.

关键词： Dissolution

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