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Gd 3 Ga 5 O 12 : a wide bandgap semiconductor electrolyte for ceramic fuel cells, effective at temperatures below 500 °C

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Journal of Rare Earths 2024年

作者： Junjiao Li Muhammad Yousaf Jahangeer Ahmed Bushra Bibi Asma Noor Norah Alhokbany Muhammad Sajid Atif Nazar M.A.K. Yousaf Shah Xiaofeng Guo Xiangqin Ding Naveed Mushtaq Yuzheng Lu Department of Electronic and Engineering Nanjing Vocational Institute of Mechatronic Technology Nanjing 211306 China College of Chemistry and Environmental Engineering Shenzhen University Shenzhen 518060 China Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh 11451 Saudi Arabia Energy Storage Joint Research Center School of Energy and Environment Southeast University Nanjing 210096 China Shenzhen Key Laboratory of Laser Engineering Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen 518060 China Institute of Microscale Optoelectronics Optical Engineering Shenzhen University Shenzhen 518060 China School of Physics Electronics and Intelligent Manufacturing Huaihua University Huaihua 418000 China Jiangsu Key Laboratory of Zero-Carbon Energy Development and System Integration Nanjing Xiaozhuang University Nanjing 211171 China

Searching for compatible electrolytes with Ni 0.8 Co 0.15 Al 0.05 LiO 2 (NCAL) electrodes with high ionic conductivity at low operational temperatures (<550 °C) is essential for the research on ceramics fuel cells (CFCs). In this work, the experimental and theoretical analyses demonstrate that the highly stable single-phase Gd 3 Ga 5 O 12 (GGO) garnet structure, composed of Gd-O octahedrons and Ga-O tetrahedrons, provides more active sites for ion transport, resulting in enhanced peak power density (PPD) and stable open circuit voltage (OCV) at low operational temperature. The unique internal garnet structure effectively reduces the interfacial impedance of the prepared fuel cell device, provides many active sites at triple-phase boundaries and increases the electrochemical stability. As a result, the constructed cell can deliver a superior peak power density of 770 mW/cm 2 at 490 °C. In addition, X-ray photoelectron spectroscopy, electrochemical impedance spectroscopy and theoretical calculations further demonstrate electrolyte effectiveness of GGO, enabling stable OCV even at a low temperature of 370 °C under a H 2 /air environment. This work can help in improving the understanding of the underlying mechanisms of a single-layer fuel cell device, which is essential to further develop this potential energy technology even at a very low temperature of 370 °C.

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Sustainable Lithium-Metal Battery Achieved by a Safe Electrolyte Based on Recyclable and Low-Cost Molecular Sieve

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Angewandte Chemie 2021年第28期133卷

作者： Dr. Zhi Chang Dr. Yu Qiao Huijun Yang Xin Cao Xingyu Zhu Prof. Ping He Prof. Haoshen Zhou Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Umezono Tsukuba 305-8568 Japan Graduate School of System and Information Engineering University of Tsukuba 1-1-1 Tennoudai Tsukuba 305-8573 Japan Center of Energy Storage Materials & Technology College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid State Micro-structures Collaborative Innovation Center of Advanced Micro-structures Nanjing University Nanjing 210093 P. R. China

As one typical clean-energy technologies, lithium-metal batteries, especially high-energy-density batteries which use concentrated electrolytes hold promising prospect for the development of a sustainable world. However, concentrated electrolytes with aggregative configurations were achieved at the expense of using extra dose of costly and environmental-unfriendly salts/additives, which casts a shadow over the development of a sustainable world. Herein, without using any expensive salts/additives, we employed commercially-available low-cost and environmental-friendly molecular sieves (zeolite) to sieve the solvation sheath of lithium ions of classic commercialized electrolyte (LiPF 6 -EC/DMC), and resulting in a unique zeolite sieved electrolyte which was more aggregative than conventional concentrated electrolytes. Inspiringly, the new-designed electrolyte exhibited largely enhanced anti-oxidation stability under high-voltage (4.6 volts) and elevated temperature (55 °C). NCM-811//Li cells assembled with this electrolyte delivered ultra-stable rechargeabilities (over 1000 cycles for half-cell; 300 cycles for pouch-cell). More importantly, sustainable NCM-811//Li pouch-cell with negligible capacity decay can also be obtained through using recyclable zeolite sieved electrolyte. This conceptually-new way in preparing safe and highly-efficient electrolyte by using low-price molecular sieve would accelerate the development of high-energy-density lithium-ion/lithium-metal batteries.

关键词： aggregative electrolyte LiF-dominated CEI layer lithium-metal battery molecular sieves zeolite

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Designing Cation–Solvent Fully Coordinated Electrolyte for High-Energy-Density Lithium–Sulfur Full Cell Based On Solid–Solid Conversion

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Angewandte Chemie 2021年第32期133卷

作者： Huijun Yang Dr. Yu Qiao Dr. Zhi Chang Prof. Ping He Prof. Haoshen Zhou Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Umezono Tsukuba 305-8568 Japan Graduate School of System and Information Engineering University of Tsukuba 1-1-1 Tennoudai Tsukuba 305-8573 Japan Center of Energy Storage Materials & Technology College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid State Micro-structures Collaborative Innovation Center of Advanced Micro-structures Nanjing University Nanjing 210093 P. R. China

Sulfur chemistry based on solid–liquid dissolution-deposition route inevitably encounters shuttle of lithium polysulfides, its parasitic interaction with lithium (Li) anode and flood electrolyte environment. The sulfurized pyrolyzed poly(acrylonitrile) (S@pPAN) cathode favors solid-solid conversion mechanism in carbonate ester electrolytes but fails to pair high-capacity Li anode. Herein, we rationally design a cation-solvent fully coordinated ether electrolyte to simultaneously resolve the problems of both Li anode and S@pPAN cathode. Raman spectroscopy reveals a highly suppressed solvent activity and a cation-solvent fully coordinated structure (molar ratio 1:1). Consequently, Li electrodeposit evolves into round-edged morphology, LiF-rich interphase, and high reversibility. Moreover, S@pPAN cathode inherits a neat solid-phase redox reaction and fully eliminated the dissolution of lithium polysulfides. Finally, we harvest a long-life Li-S@pPAN pouch cell with slight Li metal excessive (0.4 time) and ultra-lean electrolyte design (1 μL mg S −1 ), delivering 394 Wh kg −1 energy density based on electrodes and electrolyte mass.

关键词： high-energy-density lithium-sulfur battery metal-organic framework (MOF) S@pPAN cathode solid-solid conversion

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Real-time imaging of accelerated solid-liquid-gas reactions with nanobubbles

Research Square

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Research Square 2020年

作者： Wang, Wen Xu, Tao Chen, Jige Shangguan, Junyi Dong, Hui Ma, Huishu Zhang, Qiubo Bai, Tingting Guo, Zhirui Fang, Haiping Zheng, Haimei Sun, Litao SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of Education Collaborative Innovation Center for Micro/Nano Fabrication Device and System Southeast University Nanjing210096 China Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Shanghai Synchrotron Radiation Facility Zhangjiang Laboratory Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai201204 China Department of Physics East China University of Science and Technology Shanghai200237 China Department of Materials Science and Engineering University of California BerkeleyCA94720 United States Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Key Laboratory of Welding Robot and Application Technology of Hunan Province Engineering Research Center of Complex Tracks Processing Technology Equipment of Ministry of Education Xiangtan University Xiangtan411105 China The Second Affiliated Hospital Key Laboratory for Aging & Disease Nanjing Medical University Nanjing210011 China

Solid-liquid-gas reactions are ubiquitous. An understanding of how gases influence the reactions at the nanoscale is significant for achieving the enhanced triple-phase reactions. Here, we report a real-time observation of the accelerated etching of gold nanorods with oxygen nanobubbles in aqueous hydrobromic acid using liquid cell transmission electron microscopy (TEM). Our observation reveals that when an oxygen nanobubble is close to a nanorod below the critical distance (~1nm), the local etching rate is significantly enhanced with over an order of magnitude faster. Molecular dynamics simulations results show that the strong attractive van der Waals interaction between the gold nanorod and oxygen molecules facilitates the transport of oxygen through the thin liquid layer to the gold surface and thus plays a crucial role in increasing the etching rate. This result sheds light on the rational design of solid-liquid-gas reactions for enhanced activities. © 2020, CC BY.

关键词： Molecular dynamics

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Mass-manufactural Lanthanide-based Ultraviolet C microlasers

Mass-manufactural Lanthanide-based Ultraviolet C Microlasers

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第九届国际稀土开发与应用研讨会暨2019中国稀土学会学术年会

作者： Limin Jin Yunkai Wu Yujie Wang Yuqi Zhang Zhiying Li Xian Chen Wenfei Zhang Shumin Xiao Qinghai Song State Key Laboratory on Tunable Laser Technology Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information SystemShenzhen Graduate SchoolHarbin Institute of Technology College of Materials Science of Engineering Shenzhen University Shenzhen Key Laboratory of Laser Engineering College of Optoelectronic EngineeringShenzhen University Collaborative Innovation Center of Extreme Optics Shanxi University

Lanthanide(Ln)-based ultraviolet C（UVC） microlasers are highly desirable for diagnostics and phototherapy. Despite of their progresses, the potential applications of UVC microlasers are strongly hindered by their low optical gain, weak light confinements, and poor device repeatability. Herein, we report a novel approach to all-in-one solve the above limitations and realize mass-manufactural UVC microlasers. The gain coefficient at 289 nm has been improved from two aspects, i.e. the enhanced absorption via LiYbF:Tm（lmoI%）@LiYbF@LiLuF core-shell-shell nanocrystals and the suppression of competitive ultraviolet ***, by spin-coating the solution onto patterned SiO substrate, high-quality Ln-based microdisks are self-assembly formed on each SiO pillar and UVC whispering-gallery-mode lasers have been realized. The resulted lasing threshold is an order of magnitude smaller than the shortest deep-ultraviolet emission at 310 nm. Importantly,the lasing wavelengths and mode numbers of UVC lasers are highly controllable and repeatable, making them suitable for mass-production for the first time.

关键词： lanthanide-doped upconversion nanocrystals on-chip microlaser array ultraviolet C lasing emission high controllability whispering gallery modes

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A Novel Persistent In-memory Filesystem for the Fusion of Memory and Storage

A Novel Persistent In-memory Filesystem for the Fusion of Me...

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International Conference on Computer and Communications (ICCC)

作者： Shunfen Li Xiaogang Chen Wenbing Han Youkang Duan Bin MA Yidong Chen State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai China Chinese Academy of Science Shanghai Advanced Research Institute Shanghai China China Research Institute JIU YI Shanghai China

ISBN: (数字)9781728147437

ISBN: (纸本)9781728147444

Emerging non-volatile memory (NVM) technologies provide opportunities for the fusion of memory and storage. The fusion of memory and storage can exploit NVM's byte-addressability and achieve the large capacity data storage. However existing file systems built for traditional disk-based storage systems will not suit for the system based on fusion of memory and storage, which could not take full advantage of the performance that NVM should provide. Thus, it's necessary to redesign file system, over NVM medium. This paper attempts to achieve the fusion of memory and storage at the software level, which exploits NVM's byte-addressability and achieves the large capacity data storage. We converge the management of main memory and storage by implementing a file system called FRFS which optimized for NVM as the system software layer to manage the NVM medium. The proposed file system integrates the management of main memory and storage, which by adopting file page tables to fuse the memory and storage management. FRFS converges the indexing metadata and address mapping of file data into the persistent file page table. A file can be mapped into virtual address space at a constant time by embedding file page table into the calling process. Since the mapping has been established, applications can read or write the file in-place without page fault interrupt. Moreover, the addressing of file data can be efficiently handled by Memory Management Unit (MMU) hardware instead of traversing software routine, which shorting the file access path. Extensive experiments are performed on the Intel server. The results indicate that FRFS can achieve excellent performance and verify the feasibility about the fusion of memory and storage management.

关键词： Nonvolatile memory File systems Memory management Linux Metadata Random access memory

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IONSS: Indirect Observation Node Selection Scheme in Trust Management for UAV Network

IONSS: Indirect Observation Node Selection Scheme in Trust M...

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IEEE Globecom Workshops

作者： Weidong Fang Wuxiong Zhang Wei Chen Weiwei Gao Guoqing Jia Key Laboratory of Wireless Sensor Network & Communication Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai China Shanghai Research Center for Wireless Communication Shanghai China School of Computer Science and Technology China University of Mining and Technology Xuzhou China College of Physics and Electronic Information Engineering Qinghai University for Nationalities Xining China

ISBN: (数字)9781728109602

ISBN: (纸本)9781728109619

As a three-dimensional distributed network, the UAV network is very critical for communication security. The current security approaches for UAV are mainly traditional secure schemes, such as encryption, authentication, and etc. Unfortunately, these secure schemes could not defend against the internal attacks. Simultaneously, as an effective technology to defend against the internal attacks, this is, a trust management technology, has security vulnerabilities in the third party recommendation. Nevertheless, there is also the risk of cyber holes in UAV network. In this paper, we propose an indirect observation node selection scheme (IONSS) to solve these issues. For all current indirect observation nodes, their energy levels are sorted to select the appropriate nodes. The Grey-decision calculation is performed and sorted with the attribute of these nodes, and the previous nodes are preferentially selected as the indirect observation nodes. The simulation results show that the balance between security and energy efficiency.

关键词： Unmanned aerial vehicles Protocols Wireless sensor networks Encryption Authentication

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Valley filtering effect of phonons in graphene with a grain boundary

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Physical Review B 2019年第6期99卷 064302-064302页

作者： Xiaobin Chen Yong Xu Jian Wang Hong Guo State Key Laboratory on Tunable laser Technology and Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System School of Science Harbin Institute of Technology Shenzhen 518055 China Department of Physics and the Center of Theoretical and Computational Physics The University of Hong Kong Hong Kong China Collaborative Innovation Center of Quantum Matter and State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 People's Republic of China The University of Hong Kong Shenzhen Institute of Research and Innovation Shenzhen 518053 China College of Physics and Energy Shenzhen University Shenzhen 518060 China Department of Physics 3600 University McGill University Montreal Quebec H3A 2T8 Canada

Due to their possibility to encode information and realize low-energy-consumption quantum devices, control and manipulation of the valley degree of freedom have been widely studied in electronic systems. In contrast, the phononic counterpart—valley phononics—has been largely unexplored, despite the importance in both fundamental science and practical applications. In this work, we demonstrate that the control of “valleys” is also applicable for phonons in graphene by using a grain boundary. In particular, perfect valley filtering effect is observed at certain energy windows for flexural modes and found to be closely related to the anisotropy of phonon valley pockets. Moreover, valley filtering may be further improved using Fano-like resonance. Our findings reveal the possibility of valley phononics, paving the road towards purposeful phonon engineering and future valley phononics.

关键词： Ballistic transport Grain boundaries Phonons Valleytronics Graphene First-principles calculations Nonequilibrium Green's function

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Simulation and structure optimization of triboelectric nanogenerators considering the effects of parasitic capacitance

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Nano Research 2017年第1期10卷 157-171页

作者： Keren Dai Xiaofeng Wang Simiao Niu Fang Yi Yajiang Yin Long Chen Yue Zhang Zheng You Collaborative Innovation Center for Micro/Nano Fabrication Device and System State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision Instrument Tsinghua University Beijing 100084 China School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA30332-0245 USA State Key Laboratory for Advanced Metals and Materials School of Materials Science and Engineering Bei)ing Municipal Key Laboratory of New Energy Materials and Technologies University of Science and Technology Beijing Beijing 100083 China Broadcom Ltd. 2901 Via Fortuna #400 Austin TX 78746 USA

Parasitic capacitance is an unavoidable and usually unwanted capacitance that exists in electric circuits, and it is the most important second-order non-ideal effect that must be considered while designing a triboelectric nanogenerator （TENG） because its magnitude is comparable to the magnitude of the TENG capacitance. This paper investigates the structure and performance optimization of TENGs through modeling and simulation, taking the parasitic capacitance into account. Parasitic capacitance is generally found to cause severe performance degradation in TENGs, and its effects on the optimum matching resistance, maximum output power, and structural figures-of-merit （FOMs） of TENGs are thoroughly investigated and discussed. Optimum values of important structural parameters such as the gap and electrode length are determined for the different working modes of TENGs, systematically demonstrating how these optimum structural parameters change as functions of the parasitic capacitance. Additionally, it is demonstrated that the parasitic capacitance can improve the height tolerance of the metal freestanding-mode TENGs. This work provides a theoretical foundation for the structure and performance optimization of TENGs for practical applications and promotes the development of mechanical energy-harvesting techniques.

关键词： triboelectric nanogenerator parasitic capacitance figure of merit structure optimization performance optimization

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Flexible Ferroelectrics: Periodic Wrinkle‐Patterned Single‐Crystalline Ferroelectric Oxide Membranes with Enhanced Piezoelectricity (Adv. Mater. 50/2020)

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Advanced Materials 2020年第50期32卷 2070377-2070377页

作者： Guohua Dong Suzhi Li Tao Li Haijun Wu Tianxiang Nan Xiaohua Wang Haixia Liu Yuxin Cheng Yuqing Zhou Wanbo Qu Yifan Zhao Bin Peng Zhiguang Wang Zhongqiang Hu Zhenlin Luo Wei Ren Stephen J. Pennycook Ju Li Jun Sun Zuo‐Guang Ye Zhuangde Jiang Ziyao Zhou Xiangdong Ding Tai Min Ming Liu The Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education & International Center for Dielectric Research School of Electronic Science and Engineering State Key Laboratory for Mechanical Behavior of Materials the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi'an Jiaotong University Xi'an 710049 China State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China Center for Spintronics and Quantum System State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Materials Science and Engineering National University of Singapore Singapore 117574 Singapore School of Electronic and Information Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University No. 28 Xianning West Road Xi'an Shaanxi Province 710049 China National Synchrotron Radiation Laboratory & CAS Key Laboratory of Materials for Energy Conversion Department of Physics University of Science and Technology of China Hefei 230026 China Department of Nuclear Science and Engineering and Department of Materials Science and Engineering Massachusetts Institute of Technology Cambridge MA 02139 USA Department of Chemistry & 4D LABS Simon Fraser University Burnaby BC V5A 1S6 Canada The State Key Laboratory for Manufacturing Systems Engineering the International Joint Laboratory for Micro/Nano Manufacturing and Measurement Technology Xi'an Jiaotong University Xi'an 710049 China

In article number 2004477, Ziyao Zhou, Xiangdong Ding, Tai Min, Ming Liu, and co‐workers present a periodically wrinkled structure that combines flexible ferroelectric membranes and organic elastomers. Enhanced piezoelectricity is observed at the sites of the peaks and valleys of the wrinkles where the largest strain gradient is generated. The wrinkle‐patterned ferroelectric membranes offer an ideal platform to explore the periodic‐electric‐potential‐induced functions in flexible electrical and optical devices.

关键词： ferroelectrics flexoelectricity freestanding oxides piezoelectricity wrinkles

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