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A comparative study of the R-P phase Srn+1FenO3n+1 (n=1, 2 and 3) cathodes for intermediate temperature solid oxide fuel cells

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CERAMICS INTERNATIONAL 2020年第11期46卷 19335-19342页

作者： Dong, Kuan Hou, Jie Miao, Lina Jin, Zongzi Wang, Di Teng, Yue Liu, Wei Univ Sci & Technol China CAS Key Lab Mat Energy Convers Hefei 230026 Peoples R China Univ Sci & Technol China Collaborat Innovat Ctr Suzhou Nano Sci & Technol Hefei 230026 Peoples R China Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Hefei 230031 Peoples R China State Grid Anhui Elect Power Res Inst Co Ltd Hefei 230601 Peoples R China Anhui Elect Power Design Inst Co Ltd China Energy Engn Grp Hefei 230601 Peoples R China Shenzhen Univ Coll Mat Sci & Engn Shenzhen 518055 Peoples R China

A comparative investigation of the Ruddlesden-Popper (R-P) phase Srn+1FenO3n +1 (SFO, n = 1, 2 and 3) series of materials has been explored to determine their applicability as cathodes for proton-conducting solid oxide fuel cells (H-SOFCs). With the traditional solid-state reaction method, pure SFO powders were obtained. As n increases, the composition of perovskite in the material increases gradually, and the proportion of the rock salt layer decreases accordingly. The valence state of iron in the SFOs was analyzed using X-ray photoelectron spectroscopy (XPS), and the results were consistent with those estimated by an X-ray absorption fine structure (XAFS) analysis. The results show that the average valence state of iron is the lowest in SFO2 and the highest in SFO3. Notably, Sr3Fe2O7 (SFO2, n = 2) and Sr4Fe3O10, (SFO3, n = 3) showed better electronic conductivity compared with Sr2FeO4 (SFO1, n = 1), in which SFO2 was the best. Paralleling the conductivity test, the oxygen incorporation kinetics of SFO2 were better than the other two components, as measured by the electricity conductivity relaxation (ECR) method. Single cells with the structure of NiO-BaZr0.1Ce0.7Y0.2O3-delta (NiO-BZCY) anode vertical bar-BZCY electrolyte vertical bar-SFO-5wt.% BZCY cathode were also fabricated and measured from 550 to 700 degrees C. At 700 degrees C, the maximum power density of 703.8 mWcm(-2) was achieved with the SFO2-5wt.%BZCY cathode. In conclusion, SFO2 with two BO6 layers connected with a perovskite-related R-P structure is a promising cathode candidate for H-SOFCs, providing new directions for other R-P phase electrode materials for H-SOFCs.

关键词： Proton-conducting SOFCs Ruddlesden-Popper Electrical conductivity Oxygen incorporation kinetics Average valence state

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A novel BaFe0.8Zn0.1Bi0.1O3-δ cathode for proton conducting solid oxide fuel cells

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CERAMICS INTERNATIONAL 2020年第16期46卷 25453-25459页

作者： Xia, Yunpeng Xu, Xi Teng, Yue Lv, Huanlin Jin, Zongzi Wang, Di Peng, Ranran Liu, Wei Univ Sci & Technol China CAS Key Lab Mat Energy Convers Hefei 230026 Peoples R China Univ Sci & Technol China Collaborat Innovat Ctr Suzhou Nano Sci & Technol Hefei 230026 Peoples R China Chinese Acad Sci Inst Solid State Phys Key Lab Mat Phys Hefei 230031 Peoples R China State Grid Anhui Elect Power Res Inst Co Ltd Hefei 230601 Peoples R China Anhui Elect Power Design Inst Co Ltd China Energy Engn Grp Hefei 230601 Peoples R China Qingdao Univ Inst Mat Energy & Environm Coll Mat Sci & Engn Ningxia Rd 308 Qingdao 266071 Peoples R China

Cobalt-free materials with triple conductivity are considered potential cathode materials for solid oxide fuel cells (SOFC). We applied Zn to improve the hydration ability and redox activity of a traditional barium-ferrite (BFO) cathode, in order to improve the performance of the proton conductor-based SOFC (H-SOFC). Evidence suggests that the performance of BFO cathode is improved by Zn-doping. The single cell with BaFe0.8Zn0.1Bi0.1O3-delta (BFZB) as the cathode can achieve 816.26 mW cm(-2) at 700 degrees C after Zn-doping. Coupled with the impregnation method, cell performance with BFZB nanoparticles as the cathode was further improved to 1138.21 mW cm(-2) at 700 degrees C. The new cobalt-free cathode has excellent performance, which is even comparable to that of some cobalt-containing cathodes and thus worthy of further investigations.

关键词： BaFe0.8Zn0.1Bi0.1O3-delta Triple conduction Impregnation Nanoparticles

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A corrosion failure analysis of copper wires used in outdoor terminal boxes in substation

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ENGINEERING FAILURE analysis 2019年 98卷 83-94页

作者： Wu, Tangqing Zhou, Zhaofen Xu, Song Xie, Yi Huang, Lu Yin, Fucheng Xiangtan Univ Sch Mat Sci & Engn Key Lab Mat Design & Preparat Technol Hunan Prov Xiangtan 411105 Peoples R China State Grid Hunan Elect Power Co Elect Power Res Inst Changsha 410007 Hunan Peoples R China Hunan Xiangdian Boiler & Pressure Vessel Inspect Changsha 410001 Hunan Peoples R China State Grid Hunan Elect Power Co Xiangtan Power Supply Co Xiangtan 411000 Peoples R China

Many investigations in the field and laboratory have verified that sulfates and chlorides are the common corrosion products of copper and its alloys in rural and marine atmospheric environments, respectively. However, our field investigation found that a large amount of atacamite appeared in the corrosion products of copper wires in terminal boxes in a rural atmospheric environment. In this paper, SEM, XRD, XPS, electrochemical analysis and ion analysis were collectively used to uncover the essential reasons for this exceptional phenomenon. The experimental results show that the chlorine element in the corrosion product is derived from the Number Tube used to mark the copper wire in terminal boxes. The chloride ion (Cl-) and relative humidity (RH) are the key factors that affect the corrosion behavior of the copper wire, and the residual stress in the wire is another important factor to accelerate its corrosion. The research results of this paper can enrich the understanding of the corrosion behavior of copper in the atmospheric environment.

关键词： Pure copper Chloride ion (Cl-) Atmospheric corrosion Relative humidity (RH)

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An Improved Security Chip Communication Rate Setting Method 2

An Improved Security Chip Communication Rate Setting Method

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2nd IEEE International Conference on Information Systems and Computer Aided Education, ICISCAE 2019

作者： Jia, Liu Fu, Qingqin Ang, Zhengquan Xu, Pingjiang Lu, Yuhua Liang, Zhaoqin Yuan, Jiahui Nie, Rui Beijing Smartchip Microelectronics Technology Co. Ltd. Beijing Electric Power High Reliability Integrated Circuit Design Engineering Research Center Beijing China Beijing Aerospace Flight Control Center Beijing China Beijing Smartchip Microelectronics Technology Co. Ltd. Key Lab of Power Grid Design and Analysis State Grid Corporation of China Beijing China

ISBN: (纸本)9781728130668

This paper analyzes the shortcomings of two setting methods which is commonly used in security chip communication rate, and proposes an improved setting method. The basic communication rate instruction parameters are set in a security chip for setting the communication rate in different communication modes. The interface device sends the communication rate instructions to the security chip. The security chip executes the communication rate instructions so as to complete the setting of the communication rate. This method can switch the communication mode freely, so it can be applied to diversified application scenarios. © 2019 IEEE.

关键词： Communication rate Default mode Negotiation mode Security chip Specific mode

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High-precision spatial positioning optimization method based on probability of error 3

High-precision spatial positioning optimization method based...

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3rd IEEE International Conference of Safe Production and Informatization, IICSPI 2020

作者： Liu, Jianjun Cui, Guoyu Wang, Zheng Pang, Zhenjiang Mi, Zhaoyong Wang, Xiangang State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing China Beijing Smart-Chip Semiconductor Technology Co.Ltd. Beijing China Beijing Engineering Research Center of High-reliability IC with Power Industrial Grade Beijing Chip Identification Technology Co. Ltd China Beijing Smart-Chip Semiconductor Technology Co.Ltd. Beijing China

ISBN: (纸本)9781728177380

This thesis proposes a spatial three-dimensional positioning optimization method based on error probability, based on the positioning method based on time difference of arrival (TDOA), through the research on the positioning of substation inspection operators and equipment under complex working conditions, The method used optimizing the distance difference between the node to be positioned and different base stations can effectively improve the positioning accuracy of the staff and equipment in the station. The test results in a complex power frequency electric field environment show that the calculated results of this optimization method are better than the existing traditional positioning methods, and can effectively improve the positioning accuracy under line-of-sight conditions and realize the positioning of moving targets in the substation space. © 2020 IEEE.

关键词： Time difference of arrival

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Novel High Efficiency Wireless Energy Harvesting System Based on Metasurface

Novel High Efficiency Wireless Energy Harvesting System Base...

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2020 International Wireless Symposium

作者： Chang Mingyang Cui Xinwang Wang Mengfan Zhang Pei Wang Songcen Jiang Cheng Yang Chuankai Li Long Xidian Univ Sch Elect Engn Key Lab High Speed Circuit Design & EMC Minist EducCollaborat Innovat Ctr Informat Sensi Xian 710071 Peoples R China China Elect Power Res Inst Elect Engn & New Mat Dept Beijing 100192 Peoples R China State Grid Shaanxi Elect Power Co Elect Power Res Inst Xian 710100 Peoples R China

ISBN: (数字)9781728167039

ISBN: (纸本)9781728167039

In this paper, a novel high efficiency wireless energy harvesting system based on metasurface is proposed. The periodic receiving antenna array consists of 4x4 subwavelength units with branch square *** receiving efficiency of the array can reaches 84%, and the maximum gain is 9.8dB. Also, a high-efficiency rectifier circuit worked at 5.8GHz is designed for the receiving array, the simulation results show that the efficiency is 70% while the input power is 16dBm. The high-efficiency wireless energy harvesting system proposed in this article is a good candidate in wireless energy harvesting to feed some low power electrical appliances.

关键词： metasurface array rectifier wireless power transfer

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A design of the Passive Micro Sensor for SF6 Detection 3

A Design of the Passive Micro Sensor for SF6 Detection

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3rd IEEE Conference on Energy Internet and Energy System Integration, EI2 2019

作者： Qiao, Lei Liu, Rui Chu, Xin Zheng, Zhe Cui, Wenpeng Beijing Smart-Chip Microelectronics Technology Co. Ltd State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing China Beijing Engineering Research Center of High-reliability IC with Power Industrial Grade China

ISBN: (纸本)9781728131375

Aiming to explore the passive micro sensor for SF6 detection, the proposed method is about designation and structure of SF6 detection micro sensor with high signal-to-noise ratio, miniaturization and passivity. Advanced micro-machining technology is presented to sharply reduce the volume of the sensor, where the volume can be reduced by more than 50% compared with the existing sensor with discrete combination. The cost and volume reduction does not only make the new detection equipment possible, but the energy consumption of the whole system will also be greatly reduced. The application and promotion of the passive micro sensor in ring network cabinet, GIS, GIL and cable channel can bring considerable economic benefits. © 2019 IEEE.

关键词： Sulfur hexafluoride

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An error probability location estimation algorithm for use in substations 2

An error probability location estimation algorithm for use i...

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2nd IEEE International Conference on Electronics Technology, ICET 2019

作者： Li, Liang Wang, Zheng Ao, Chen Yang, Weimin Zhou, Wenjun Zou, Hongsen State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing China School of Electrical Engineering and Automation Wuhan University Wuhan China State Grid Ningxia Electric Power Co. Ltd Yinchuan China

ISBN: (纸本)9781728116181

By acquiring the location information of the mobile target using the location estimation algorithm based on the wireless sensor network, human life in the substation and the safe operation of the mobile device can be protected, and the intelligent management of the mobile target in the substation can be realized. This is of great significance for realizing the intelligence and informationization of substation management. The environment in the substation is complex and there is Non Line of Sight (NLOS) propagation. In view of the large error in the results of the existing mobile position estimation algorithm in the NLOS environment, this paper proposes an error probability localization algorithm suitable for substation. The simulation results show that the proposed algorithm has higher positioning accuracy than the existing algorithms. © 2019 IEEE.

关键词： Informatization

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Experimental research on the influence of stratum permeability on the time-varying properties of active grout

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TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY 2023年第1期133卷

作者： Min, Fanlu Song, Banghong Liu, Tao Yu, Chaojie Zhang, Nan Zhang, Di Xing, Huitang Zhang, Lei Zhang, Jianfeng Hohai Univ Minist Educ Key Lab Geomech & Embankment Engn Nanjing 210024 Peoples R China Hohai Univ Coll Civil & Transportat Engn Nanjing 210024 Peoples R China Ocean Univ China Shandong Prov Key Lab Marine Environm & Geol Engn Qingdao 266100 Peoples R China Pilot Natl Lab Marine Sci & Technol Lab Marine Geol Qingdao 266061 Peoples R China State Grid Changshu Cty Elect Power Supply Co Suzhou 215500 Peoples R China Univ Texas Arlington Dept Civil Engn Arlington TX 76019 USA China Railway Siyuan Survey & Design Grp Co Ltd Wuhan 430063 Peoples R China Jinan Rail Transit Grp Co Ltd Jinan 250000 Peoples R China CCCC Tunnel Engn Co Ltd Beijing 100102 Peoples R China Hohai Univ Coll Mech & Mat Nanjing 210024 Peoples R China Hohai Univ Coll Civil & Transportat Engn 1 Xikang Rd Nanjing 210024 Peoples R China Ocean Univ China Shandong Prov Key Lab Marine Environm & Geol Engn Qingdao 266100 Shandong Peoples R China

In the construction of underground projects, the water-binder ratio is generally considered as one of the main factors affecting the cement-based backfill grouting performance. In addition, when the backfill grouting is consolidated in the formation. The difference in the permeability of the formation will affect the consolidation rate and consolidation drainage of the backfill grouting, resulting in changes in the water-binder ratio of the grout, which in turn affects the development of its performance after consolidation. However, it is difficult to simulate the consolidation and hardening process of backfill grouting in the formation with the current indoor test equipment. Therefore, the influence of the permeability difference of the stratum on the time-varying law of backfill grouting and consolidation is less studied. In this paper, the self-made consolidation test device is used to study the time-varying law of grout consolidation in different permeable formations, and the time-varying law of grout performance is studied by using the samples after consolidation. The results show that with the increase of formation permeability coefficient, the dissipation time of excess pore water pressure of grout decreases, and the volumetric strain increases. The grout consolidation rate is determined by the relative permeability coefficient between the grout and the formation, and the difference in consolidation causes changes in the moisture content of the grout after consolidation. The change of the ratio of bound water to free water affects the time-varying law of strength after consolidation.

关键词： Shield tunnel Backfill grouting Formation permeability Consolidation Water form transformation

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An effective three-stage hybrid optimization method for source-network-load power generation of cascade hydropower reservoirs serving multiple interconnected power grids

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JOURNAL OF CLEANER PRODUCTION 2020年 246卷 119035-000页

作者： Feng, Zhong-kai Niu, Wen-jing Cheng, Xiong Wang, Jia-yang Wang, Sen Song, Zhen-guo Huazhong Univ Sci & Technol Sch Hydropower & Informat Engn Wuhan 430074 Peoples R China ChangJiang Water Resources Commiss Bur Hydrol Wuhan 430010 Hubei Peoples R China Three Gorges Univ Coll Hydraul & Environm Engn Yichang 443002 Peoples R China Elect Power Res Inst China Southern Power Grid Guangzhou 510080 Guangdong Peoples R China Minist Water Resources Key Lab Pearl River Estuarine Dynam & Associated Guangzhou 510611 Guangdong Peoples R China China Ship Dev & Design Ctr Wuhan 430064 Hubei Peoples R China

In China, many cascade hydropower reservoirs are asked to simultaneously respond the peak loads of several interconnected power grids based on the signed agreements. However, by far, there are few reports addressing the brand-new engineering problem with huge optimization difficulty caused by multilateral generation contracts, strong hydraulic-electric relationships, load feature differences and spatial-temporal coupled constraints. Here, a three-stage hybrid method is developed to satisfy this practical requirement, where the domain knowledge is firstly used to build a virtual load curve balancing the load features and electricity contracts of multiple power grids;secondly, the dynamic programming is used to determine the scheduling process of the optimized hydroplant, while the linear programming is chosen to allocate the hydropower generation among multiple power grids;finally, the quality of solution is gradually improved via iterative search. The results in two real-world cascade hydropower systems indicate that the hybrid method can achieve satisfactory scheduling results in different cases. Thus, an effective way to reduce the optimization difficulty of the large and complex problem is to break up into a series of simple and independent subproblems to be addressed by existing mature methods. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Cascade hydropower system Peak shaving operation Domain knowledge Dynamic programming Linear programming Multiple interconnected electric power grids

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