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energy & Environmental Materials 2024年第1期7卷 5-12页

作者： Yang Guo Zhaoqing Jin Jianhao Lu Zilong Wang Zihao Song Anbang Wang Weikun Wang Yaqin Huang beijing key laboratory of Electrochemical Process and Technology for Materials Key Laboratory of Biomedical Materials of Natural Macromolecules Ministry of Education Beijing University of Chemical Technology Research Institute of Chemical Defense Beijing Key Laboratory of Advanced Chemical Energy Storage Technology and Materials

The sluggish kinetics of complicated multiphase conversions and the severe shuttling effect of lithium polysulfides（LiPSs） significantly hinder the applications of Li-S battery,which is one of the most promising candidates for the next-generation energy storage ***,a bifunctional electrocatalyst,indium phthalocyanine self-assembled with carbon nanotubes（InPc@CNT） composite material,is proposed to promote the conversion kinetics of both reduction and oxidation processes,demonstrating a bidirectional catalytic effect on both nucleation and dissolution of Li2S species.

关键词： bidirectional catalyst indium phthalocyanine lithium−sulfur batteries pouch cells

Terahertz wide-angle metalens with nearly ideal object-image relation

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Chinese Optics Letters 2024年第1期22卷 147-152页

作者：王宇程洁嵘冀允允范飞常胜江 Institute of Modern Optics Nankai UniversityTianjin 300350China Tianjin key laboratory of micro-scale Optical Information Science and Technology Tianjin 300350China Tianjin key laboratory of Optoelectronic sensor and Sensing Network Technology Tianjin 300350China

Metalenses are essential components in terahertz imaging ***,without careful design,they show limited field of view and their practical applications are ***,a wide-angle metalens is proposed whose structure is optimized for focusing within the incident angles of±25°.Simulation and experiment results show that the focusing efficiency,spot size,and modulation transfer function of this lens are not sensitive to the incident *** importantly,this wide-angle metalens follows the ideal Gaussian formula for the object-image relation,which ensures a wider field of view and better contrast in the imaging experiment.

关键词： terahertz metalens wide-angle Gaussian formula

On-demand molecular design for efficient blue phosphorescence

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Science China Chemistry 2024年第7期67卷 2124-2126页

作者： Meiqi Dai Dongpeng Yan beijing key laboratory of energy Conversion and Storage Materials Key Laboratory of RadiopharmaceuticalsMinistry of EducationCollege of ChemistryBeijing Normal UniversityBeijing 100875China

Blue luminescence(including both fluorescence and phosphorescence)is one of the core elements in solid-state lighting and full-color *** to now,ultralong room temperature phosphorescence(RTP)with a long lifetime over 0.1 s has been continuously *** ultralong phosphorescence emission bands are in the region of 500 to600 ***,high-energy blue phosphorescence remains an immense challenge[1].

关键词： blue lifetime bands

Highly stretchable kirigami-patterned nanofiber-based nanogenerators for harvesting human motion energy to power wearable electronics

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Materials Futures 2024年第2期3卷 131-140页

作者： Chuan Ning Shengxin Xiang Xiupeng Sun Xinya Zhao Chuanhui Wei Lele Li Guoqiang Zheng Kai Dong College of Materials Science and Engineering Key Laboratory of Material Processing and Mold(Ministry of Education)Zhengzhou UniversityZhengzhou 450001People’s Republic of China key laboratory of Materials Physics Ministry of EducationSchool of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450001People’s Republic of China CAS Center for Excellence in nanoscience Beijing Key Laboratory of Micro-Nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400People’s Republic of China School of nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049People’s Republic of China

Wearable electronics are advancing towards miniaturization and ***,traditional energy supply methods have largely hindered their *** effective solution to this problem is to convert human mechanical energy into electricity to power wearable electronic ***,it is greatly attractive to design flexible,foldable and even stretchable energy harvesting ***,we use the electrospinning and kirigami approach to develop a type of highly stretchable kirigami-patterned nanofiber-based triboelectric nanogenerator(K-TENG).Due to its innovative structural design,the K-TENG can achieve a tensile strain of 220%,independent of the tensile properties of the material *** a person swings their arms,the K-TENG fixed to the clothing can convert mechanical energy from human movement into electrical *** produced electricity can directly drive 50 LED lights and a digital watch,or be stored in a lithium battery to charge the smartwatch and smartphone,*** study employs a new method to fabricate a stretchable triboelectric nanogenerator and demonstrates its promising applications in wearable power technology.

关键词： stretchable triboelectric nanogenerators kirigami energy harvesting

Interface and mechanical degradation mechanisms of the silicon anode in sulfide-based solid-state batteries at high temperatures

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Chinese Physics B 2024年第8期33卷 117-126页

作者：王秋辰黄昱力许晶禹习谦李泓陈立泉 key laboratory for Renewable energy Beijing Key Laboratory for New Energy Materials and DevicesBeijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Huairou Division Institute of PhysicsChinese Academy of SciencesBeijing 101408China

Silicon(Si)is a competitive anode material owing to its high theoretical capacity and low electrochemical ***,the prospect of Si anodes in solid-state batteries(SSBs)has been proposed due to less solid electrolyte interphase(SEI)formation and particle ***,major challenges arise for Si anodes in SSBs at elevated *** this work,the failure mechanisms of Si-Li_(6)PS_(5)Cl(LPSC)composite anodes above 80℃are thoroughly investigated from the perspectives of interface stability and(electro)chemo-mechanical *** chemistry and growth kinetics of Lix Si|LPSC interphase are demonstrated by combining electrochemical,chemical and computational *** and/or Si–P compound formed at Lix Si|LPSC interface prove to be detrimental to interface stability at high *** the other hand,excessive volume expansion and local stress caused by Si lithiation at high temperatures damage the mechanical structure of Si-LPSC composite *** work elucidates the behavior and failure mechanisms of Si-based anodes in SSBs at high temperatures and provides insights into upgrading Si-based anodes for application in SSBs.

关键词： sulfide electrolytes silicon anodes interface stability degradation kinetics all-solid-state batteries

Liquid metal as an efficient protective layer for lithium metal anodes in all-solid-state batteries

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Carbon energy 2024年第7期6卷 219-229页

作者： Shiqiang Zhou Mengrui Li Peike Wang Lukuan Cheng Lina Chen Yan Huang Boxuan Cao Suzhu Yu Qingju Liu Jun Wei Shenzhen key laboratory of Flexible Printed Electronics Technology Harbin Institute of TechnologyShenzhenChina School of Materials Science and Engineering Harbin Institute of TechnologyShenzhenChina State key laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbinChina Yunnan key laboratory for micro/nano Materials and Technology School of Materials and EnergyYunnan UniversityKunmingChina

Lithium metal batteries with inorganic solid-state electrolytes have emerged as strong and attractive candidates for electrochemical energy storage devices because of their high-energy content and ***,inherent challenges of deleterious lithium dendrite growth and poor interfacial stability hinder their commercial ***,we report a liquid metal-coated lithium metal(LM@Li)anode strategy to improve the contact between lithium metal and a Li6PS5Cl inorganic *** LM@Li symmetric cell shows over 1000 h of stable lithium plating/stripping cycles at 2mA cm^(-2) and a significantly higher critical current density of 9.8 mAcm^(-2) at 25°*** addition,a full battery assembled with a high-capacity composite LiNbO3@-LiNi_(0.7)Co_(0.2)Mn_(0.1)O_(2)(LNO@NCM721)cathode shows stable cycling *** and computational results have demonstrated that dendrite growth tolerance and physical contact in solid-state batteries can be reinforced by using LM interlayers for interfacial modification.

关键词： all-solid-state batteries interface engineering liquid metals lithium metal anodes

Insulation Design Rule for a Spacer in SF_(6)/N_(2)-filled DC Gas Insulated Apparatus

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CSEE Journal of Power and energy Systems 2024年第2期10卷 727-735页

作者： Hongyang Zhou Guoming Ma Meng Zhang Cong Wang Youping Tu Chengrong Li State key laboratory of Alternate Electrical Power System with Renewable energy Sources and the beijing key laboratory of High Voltage and EMC North China Electric Power UniversityBeijing 102206China

A recurring challenge of a DC SF_(6)/N_(2)-filled GIS/GIL apparatus is the charge accumulation at DC *** conventional design rules and knowledge of AC spacers may not be applicable for this new type of apparatus.A novel design rule is proposed considering the effect of accumulated charge on the threshold of electric field strength being resistant to the superposed voltage.A surface charge accumulation simulation model is introduced,and the key parameters in the simulation model are *** addition,an experimental platform for a 100 kV spacer flashover test is *** flashover tests under superimposed voltage with opposing polarities are carried out,and the withstanding voltage of the spacer is ***,based on the proposed model,the threshold of the surface electric field strength(tangential component)on the DC spacer in SF_(6)/N_(2) mixed gases is *** a reliable insulation design of a DC GIS/GIL apparatus filled with 0.7 MPa SF_(6)/N_(2),the threshold of surface electric field strength on the DC spacer is 12 kV/*** insulation design rule can be referenced in the design of a high-voltage DC SF_(6)/N_(2)-filled GIS/GIL apparatus.

关键词： Charge accumulation DC spacer flashover voltage SF_(6)/N_(2) threshold of surface electric field strength

Charge Accumulation Characteristics of SF6-Epoxy Interface Under Negative Repetitive nanosecond Pulses

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CSEE Journal of Power and energy Systems 2024年第4期10卷 1808-1815页

作者： Shaocong Wu Geng Chen Yuming Shao Hao Xu Xuanning Zhang Yanyu Liang Youping Tu State key laboratory of Alternate Electrical Power System with Renewable energy Sources and the beijing key laboratory of High Voltage and EMC North China Electric Power UniversityBeijing 102206China

Repetitve nanosecond impulses in gas-insulated metal-enclosed switchgear (GIS) are likely to trigger inside flashover. Interface charges on the spacer in GIS are considered one of the main factors damaging insulation performance and may be induced by overvoltage. For good understanding of insulation failures, accumulation characteristics of charges between SF6 and epoxy spacers under repetitive nanosecond impulses are investigated. It can be found under nanosecond impulses, the charge source in gas volume contributes to interface charge accumulation predominantly. Interface charges will be promoted by impulse number and amplitude. Accumulation processes are analyzed based on runaway electrons mechanism. When impulse amplitude exceeds a threshold value, discharge in the gas volume turns to a runaway mode. A runaway electron leads to the interface charge accumulation. Affected by motion of the runaway electrons, the potential peak gradually moves close to the grounded electrode when impulse amplitude is raised. Meanwhile, increasing impulse number can enhance surface potential. Surface potential will reach saturation eventually. However, memory effect of the repetitive impulse discharge makes the half-peak width of the surface potential at the interface change little. Design of GIS gas-solid insulations can refer to this research.

关键词： GIS interface charge repetitive nano-second pulse SF6

Ultra-Robust and High-Performance Rotational Triboelectric nanogenerator by Bearing Charge Pumping

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energy & Environmental Materials 2024年第2期7卷 347-353页

作者： Xianpeng Fu Yuhan Qin Zhi Zhang Guoxu Liu Jie Cao Beibei Fan Zhaozheng Wang Zheng Wang Chi Zhang CAS Center for Excellence in nanoscience Beijing Key Laboratory of Micronano Energy and Sensor Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences School of nanoscience and Technology University of Chinese Academy of Sciences Center on nanoenergy Research School of Physical Science and Technology Guangxi University

As an emerging technology to convert environmental high-entropy energy into electrical energy, triboelectric nanogenerator(TENG) has great demands for further enhancing the service lifetime and output performance in practical applications. Here, an ultra-robust and high-performance rotational triboelectric nanogenerator(R-TENG) by bearing charge pumping is proposed. The R-TENG composes of a pumping TENG(P-TENG), an output TENG(O-TENG), a voltage-multiplying circuit(VMC), and a buffer *** P-TENG is designed with freestanding mode based on a rolling ball bearing, which can also act as the rotating mechanical energy harvester. The output low charge from the P-TENG is accumulated and pumped to the noncontact O-TENG, which can simultaneously realize ultralow mechanical wear and high output performance. The matched instantaneous power of R-TENG is increased by 32 times under 300 r/min. Furthermore, the transferring charge of R-TENG can remain 95% during 15 days(6.4 × 10～6cycles)continuous operation. This work presents a realizable method to further enhance the durability of TENG, which would facilitate the practical applications of high-performance TENG in harvesting distributed ambient micro mechanical energy.

关键词： bearing charge pumping triboelectric nanogenerators ultralow mechanical wear ultra-robust voltage-multiplying circuit

具有骨样微环境的压电催化可控矿化支架实现内源性骨再生

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Science Bulletin 2024年第12期69卷 1895-1908页

作者：崔希胥玲玲单义珠李佳宣吉健颖汪恩贵张葆堃文晓舟白源罗聃陈春英李舟 beijing key laboratory of micro-nano energy and sensor Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China School of nanoscience and Engineering University of Chinese Academy of SciencesBeijing 100049China New Cornerstone Science laboratory CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety and CAS Center for Excellence in NanoscienceNational Center for Nanoscience and TechnologyBeijing 100190China

Orderly hierarchical structure with balanced mechanical,chemical,and electrical properties is the basis of the natural bone *** by nature,we developed a piezocatalytically-induced controlled mineralization strategy using piezoelectric polymer poly-L-lactic acid(PLLA)fibers with ordered micro-nano structures to prepare biomimetic tissue engineering scaffolds with a bone-like microenvironment(pcm-PLLA),in which PLLA-mediated piezoelectric catalysis promoted the in-situ polymerization of dopamine and subsequently regulated the controllable growth of hydroxyapatite crystals on the fiber *** fibers,as analogs of mineralized collagen fibers,were arranged in an oriented manner,and ultimately formed a bone-like interconnected pore structure;in addition,they also provided bone-like piezoelectric *** uniformly sized HA nanocrystals formed by controlled mineralization provided a bone-like mechanical strength and chemical *** pcm-PLLA scaffold could rapidly recruit endogenous stem cells,and promote their osteogenic differentiation by activating cell membrane calcium channels and PI3K signaling pathways through ultrasound-responsive piezoelectric *** addition,the scaffold also provided a suitable microenvironment to promote macrophage M2 polarization and angiogenesis,thereby enhancing bone regeneration in skull defects of *** proposed piezocatalytically-induced controllable mineralization strategy provides a new idea for the development of tissue engineering scaffolds that can be implemented for multimodal physical stimulation therapy.

关键词： Piezoelectric catalysis Controllable mineralization Biomimetic Bone repair Biodegradable