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Atomically isolated Pd sites within Pd-S nanocrystals enable trifunctional catalysis for direct,electrocatalytic and photocatalytic syntheses of H_(2)O_(2)

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Nano Research 2022年第3期15卷 1861-1867页

作者： Tang Yang Chengyong Yang Jiabo Le Zhiyong Yu Lingzheng Bu Leigang Li Shuxing Bai Qi Shao Zhiwei Hu Chih-Wen Pao Jun Cheng Yonggang Feng Xiaoqing Huang State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China College of Chemistry Chemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Max-Planck-Institute for Chemical Physics of Solids Nöthnitzer Street 40Dresden 01187Germany “National Synchrotron Radiation Research Center” Hsinchu 30076TaiwanChina

Although high-efficiency production of hydrogen peroxide(H_(2)O_(2))can be realized separately by means of direct,electrochemical,and photocatalytic synthesis,developing versatile catalysts is particularly challenging yet ***,for the first time we reported that palladium-sulphur nanocrystals(Pd-S NCs)can be adopted as robust and universal catalysts,which can realize the efficient O_(2) conversion by three *** a result,Pd-S NCs exhibit an excellent selectivity(89.5%)to H_(2)O_(2)with high productivity(133.6 mol·kgcat^(−1)·h^(−1))in the direct synthesis,along with the significantly enhanced H_(2)O_(2)production activity and stability via electrocatalytic and photocatalytic *** is demonstrated that the isolated Pd sites can enhance the adsorption of O_(2) and inhibit its O–O bond dissociation,improving H_(2)O_(2)selectivity and reducing H_(2)O_(2)*** study confirms that the difference in surface atom composition and arrangement is the key factor for different ORR mechanisms on Pd NCs and Pd-S NCs.

关键词： Pd-S universality direct synthesis of H_(2)O_(2) oxygen reduction photocatalysis

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Hybrid integrated multi-lane erbium-doped Si3N4 waveguide amplifiers

Hybrid integrated multi-lane erbium-doped Si3N4 waveguide am...

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2024 Optical Fiber Communications Conference and Exhibition, OFC 2024

作者： Qiu, Zheru Ji, Xinru Liu, Yang Hafermann, Martin Kim, Taegon Olson, Joseph C. Rui Ning, Wang Ronning, Carsten Kippenberg, Tobias LausanneCH-1015 Switzerland Center For Quantum Science And Engineering Epfl LausanneCH-1015 Switzerland Friedrich Schiller University Jena Institute of Solid State Physics Max-Wien-Platz 1 Jena07743 Germany Applied Materials Inc. Spg Group GloucesterMA01930 United States

We present the integration of four individual erbium-doped waveguide optical amplifiers on a Si3N4 photonic integrated circuit hybrid integrated with a four-lane semiconductor pump laser diode chip. Each amplifier ach... 详细信息

ISBN: (纸本)9781957171326

关键词： Silicon compounds

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Electrochemical hydrogen-storage capacity of graphene can achieve a carbon-hydrogen atomic ratio of 1:1

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science China Chemistry 2022年第2期65卷 318-321页

作者： Quanfeng He Lanping Zeng Lianhuan Han Juan Peng Matthew M.Sartin Yuan-Zhi Tan Dongping Zhan Zhong-Qun Tian State Key Laboratory of Physical Chemistry of Solid Surfaces Fujian Science&Technology Innovation Laboratory for Energy Materials of ChinaEngineering Research Center of Electrochemical Technologies of Ministry of EducationGraphene Industry and Engineering Research InstituteDepartment of ChemistryCollege of Chemistry and Chemical EngineeringDepartment of Mechanical and Electrical EngineeringSchool of Aerospace EngineeringXiamen UniversityXiamen 361005China Department of Chemistry College of Chemistry and Chemical EngineeringNingxia UniversityYinchuan 750021China

As a promising hydrogen-storage material,graphene is expected to have a theoretical capacity of 7.7 wt%,which means a carbon-hydrogen atomic ratio of 1:***,it has not been demonstrated yet by experiment,and the aim of the *** of Energy is to achieve 5.5 wt%in *** designed a spatially-confined electrochemical system and found that the storage capacity of hydrogen adatoms on single layer graphene(SLG)is as high as 7.3 wt%,which indicates a carbon-hydrogen atomic ratio of 1:1 by considering the sp^(3) defects of ***,SLG was deposited on a large-area polycrystalline platinum(Pt)foil by chemical vapor deposition(CVD);then,a micropipette with reference electrode,counter electrode and electrolyte solution inside was impacted on the SLG/Pt foil(the working electrode)to construct the spatially-confined electrochemical *** SLG-uncovered Pt atoms act as the catalytic sites to convert protons(H^(+))to hydrogen adatoms(H_(ad)),which then spill over and are chemically adsorbed on SLG through surface diffusion during the cathodic *** the electrode processes are reversible,the H_(ad) amount can be measured by the anodic stripping *** is the first experimental evidence for the theoretically expected hydrogen-storage capacity on graphene at ambient environment,especially by using H+rather than hydrogen gas(H_(2))as the hydrogen source,which is of significance for the practical utilization of hydrogen energy.

关键词： graphene hydrogen storage surface electrochemistry adsorption desorption spillover surface diffusion

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Synthesis strategies of hard carbon anodes for sodium-ion batteries

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materials Reports(Energy) 2024年第2期4卷 1-22页

作者： Jian Yin Ye Shui Zhang Hanfeng Liang Wenli Zhang Yunpei Zhu Laboratory of Environmental Sciences and Technology Xinjiang Technical Institute of Physics&ChemistryChinese Academy of SciencesUrumqi830011China Materials Science and Engineering Physical Science and Engineering DivisionKing Abdullah University of Science and Technology(KAUST)Thuwal23955-6900Saudi Arabia School of Engineering University of AberdeenAberdeenAB243UEUK State Key Laboratory of Physical Chemistry of Solid Surfaces Tan Kah Kee Innovation Laboratory(IKKEM)College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Guangdong Provincial Laboratory of Chemistry and Fine Chemical Engineering Jieyang Center Jieyang515200China Guangdong Provincial Key Laboratory of Plant Resources Biorefinery School of Chemical Engineering and Light IndustryGuangdong University of Technology(GDUT)Panyu DistrictGuangzhou510006China School of Advanced Manufacturing Guangdong University of Technology(GDUT)Jieyang522000China

Sodium-ion battery(SIB)is an ideal candidate for large-scale energy storage due to high abundant sodium sources,relatively high energy density,and potentially low *** carbons,as one of the most promising anodes,could deliver high plateau capacities at low potentials,which boosts the energy densities of *** slope capacities have been demonstrated from the defect adsorption of sodium ions,while the plateau capacity depends highly on intercalation and pore ***,the specific structures of sodium ions stored in hard carbons have not been clarified,namely active sites of adsorption,intercalation,and pore-filling ***,delicate synthesis methods are required to prepare hard carbons with controllable specific structures,along with elucidating the precise active sites for enhancing the Na-ion storage *** offer databases for future designs,we summarized the synthesis strategies of hard carbon anodes for constructing active sites of plateau *** methods were highlighted with corresponding influences on the meticulous structures of hard carbons and Na-ion storage *** but not least,perspectives were proposed for developing hard carbon anodes from the points of research and practical applications.

关键词： Hard carbon anodeCarbon synthesisSodium-ion batteryStructure-function relationship

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Scaled-up synthesis of defect-rich layered double hydroxide monolayers without organic species for efficient oxygen evolution reaction

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Green Energy & Environment 2022年第5期7卷 975-982页

作者： Haoyuan Chi Jingwen Dong Tian Li Sha Bai Ling Tan Jikang Wang Tianyang Shen Guihao Liu Lihong Liu Luyi Sun Yufei Zhao Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing100875China Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut06269USA Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

The scaled-up synthesis of organic-free monolayer nanomaterials is highly desirable,especially in obtaining green energy by *** this study,a method for the scaled-up synthesis of the series of monolayer layered double hydroxides(LDHs)without the addition of organic solvents is reported via the separate nucleation and aging steps *** resulting monolayer LDHs with the thicknesses of less than 1 nm showed a narrow thickness distribution.X-ray absorption fine-structure revealed that monolayer NiFe-LDH nanosheets have a number of oxygen and metal vacancies *** a practical application,monolayer NiFe-LDH nanosheets containing defects showed an enhanced electrocatalytic water oxidation activity compared with that of bulk *** functional theory calculations uncovered that excellent catalytic activity is attributed to vacancies *** proposed method is an economical and universally applicable strategy for the scaled-up production of monolayer LDHs.

关键词： process synthesis monolayer

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“Three‐in‐one”strategy:Heat regulation and conversion enhancement of a multifunctional separator for safer lithium-sulfur batteries

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Carbon Energy 2023年第11期5卷 54-67页

作者： Kaiping Zhu Luhe Li Pan Xue Jun Pu Liyun Wu Gengde Guo Ran Wang Ye Zhang Huisheng Peng Guo Hong Qiang Zhang Yagang Yao National Laboratory of Solid State Microstructures College of Engineering and Applied SciencesJiangsu Key Laboratory of Artificial Functional MaterialsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjingChina Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhuChina State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceLaboratory of Advanced MaterialsFudan UniversityShanghaiChina Department of Materials Science and Engineering College of EngineeringCity University of Hong KongHong KongChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijingChina

The safety problems encountered with lithium–sulfur batteries(LSBs)hinder their development for practical ***,a highly thermally conductive separator was constructed by cross‐weaving super‐aligned carbon nanotubes(SA‐C)on super‐aligned boron nitride@carbon nanotubes(SA‐BC)to create a composite film(SA‐BC/SA‐C).This separator was used to fabricate safe LSBs with improved electrochemical *** highly aligned separator structure created a uniform thermal field that could rapidly dissipate heat accumulated during continuous operation due to internal resistance,which prevented the development of extremely high *** array of boron nitride nanosheets endowed the composite separator with a large number of adsorption sites,while the highly graphitized carbon nanotube skeleton accelerated the catalytic conversion of high‐valence polysulfides into low‐valence *** arrayed molecular brush design enabled the regulation of local current density and ion flux,and considerably alleviated the growth of lithium dendrites,thus promoting the smooth deposition of Li ***,a battery constructed with the SA‐BC/SA‐C separator showed a good discharge capacity of 685.2 mAh g−1 over 300 cycles(a capacity decay of 0.026%per cycle)at 2 C and 60°***“three‐in‐one”multifunctional separator design strategy constitutes a new path forward for overcoming the safety problems of LSBs.

关键词： conversion enhancement heat regulation high safety lithium-sulfur batteries multifunctional separator

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Fabrication of a high-power pump and signal combiner with an asymmetric tapered fiber bundle utilizing un-pretreated pump fibers

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Optics Express 2025年第6期33卷 12349-12360页

作者： Ji, Mengyuan Liu, Kai Chen, Wenqi Yi, Xuezhuan Wang, Meng Tian, Lei Meng, Junqing Wangzhijiang Innovation Center for Laser Aerospace Laser Technology and System Department Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China Advanced Laser and Optoelectronic Functional Materials Department Special Glasses and Fibers Research Center Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai201800 China Beijing Institute of Tracking and Telecommunication Technology Beijing100049 China

We report a fabrication method for addressing the non-uniform arrangement issues associated with the asymmetric tapered fiber bundles (TFBs) in high-power pump and signal combiners (PSCs), which do not require pre-treatment of the pump fibers. It employs a homemade thin-walled glass tube with the coating layer, and six pump fibers surround it evenly to collectively form the TFB, while the signal fiber remains unaffected during the tapering process of the fiber bundle. The 3D simulation model of the backward (6 + 1)×1 PSC was established by the refractive index distribution method to calculate the transmission efficiency of the pump light and signal light, and then identify the optimal preparation parameters for achieving the best efficiency. In this model, a simulated quasi-uniform energy distribution light field was used as the input of the pump fiber, which can optimize the previous calculation method. Experimental results exhibited that the backward (6 + 1)×1 PSC achieved signal light and pump light transmission efficiencies of over 96% and 98%, respectively, the beam quality degradation is ∆M2 = 0.09, and the total output pump power was 4.102 kW. The experimental results are in good agreement with the simulation results. © 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.

关键词： Refractive index

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Topological adiabatic metatapering and beam shaping in solid-state phononic metamaterials

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Physical Review Applied 2025年第2期23卷 024028-024028页

作者： Hua-Yang Chen Jiang-Po Zheng Bo-Yu Li Zhen-Hui Qin Sheng-Nan Liang Jian-Lan Xie Xue-Jun Yan Si-Yuan Yu Cheng He National Laboratory of Solid-State Microstructures and Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing 210093 China

Achieving efficient and crosstalk-free connections between components is crucial in analog devices. The recent development of topological materials within condensed matter physics has underscored their considerable potential as infrastructure for phononic and photonic analog signal processing. This is attributed to their capacity to facilitate a high degree of freedom, broadband, dispersion-free, and antireflective mechanical and electromagnetic wave transmission. The merits of this transmission warrant further exploration and extension into the domain of component connections. Here, we introduce and validate an ideal connector, termed a topological metataper, harnessing solid-state phononic crystal plates. By employing an adiabatic assembly of topological insulator interfaces with varying skin depths, the metataper sustains all the beneficial attributes of topological materials, thus enabling lossless transmission aperture switching on demand, presenting an ideal solution for connecting phononic and photonic components of varying sizes in series or parallel. This metataper also lights up as an exemplary beam-shaping technique, adept at transforming diverse incidences into coherent plane-wave emissions with predefined apertures and energy profiles. This study broadens the application of topological materials beyond waveguides, laying the groundwork for multifunctional and efficient topological photonic and phononic chips for future information processing, sensing, manipulating, and energy harvesting.

关键词： Topological insulators

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Introducing Spin Polarization into Mixed-Dimensional Van der Waals Heterostructures for High-Efficiency Visible-Light Photocatalysis

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Energy & Environmental materials 2023年第5期6卷 192-200页

作者： Yong Wang Wei Xu Yu Zhang Chengxin Zeng Weining Zhang Lin Fu Mei Sun Yizhang Wu Jian Hao Wei Zhong Youwei Du Rusen Yang Academy of Advanced Interdisciplinary Research School of Advanced Materials and NanotechnologyXidian UniversityXi'an 710126China National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and Jiangsu Provincial Key Laboratory for NanotechnologyNanjing UniversityNanjing 210093China Department of Physics Shaanxi University of Science and TechnologyXi'an 710021China Department of Physics State Key Laboratory of Surface PhysicsFudan UniversityShanghai 200433China State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering Ningxia UniversityYinchuan 750021China

The low separation efficiency of the photogenerated carrier and the poor activity of the surface redox reaction are the main barrier to further improvement of photocatalytic *** address these issues,introducing spin-polarized electrons in single-component photocatalytic materials emerged as a promising ***,the decreased redox ability of photocarriers in these materials becomes a new ***,we mitigate this challenge with a carbon nitride sheet(CNs)/graphene nanoribbon(GNR)composite material that has a van der Waals heterostructures(vdWHs)and spin-polarized electron *** results and theoretical calculations show that the heterostructure has a strong redox ability,high carrier-separation efficiency,and enhanced surface catalytic ***,the mixed-dimensional CNs/GNR vdWHs exhibit remarkable performance for H_(2)and O_(2)generation as well as CO_(2)production under visible-light irradiation without any *** spin-polarized vdWHs discovered in this study revealed a new type of photocatalytic materials and advanced the development of spintronics and photocatalysis.

关键词： DFT calculations spin polarization Van der Waals heterostructures visible-light photocatalysis

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用于微电池的超高功率密度铁氧硫化物薄膜

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science China materials 2023年第1期66卷 118-126页

作者：柯秉渊王星辉程受麟李王阳邓人铭张聪聪林杰谢清水彭栋梁 College of Physics and Information Engineering Institute of Micro-Nano Devices and Solar CellsFuzhou UniversityFuzhou 350108China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou 213000China State Key Laboratory for Physical Chemistry of Solid Surfaces Fujian Key Laboratory of Materials GenomeCollaborative Innovation Center of Chemistry for Energy MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China

作为微电池的核心指标之一,面积功率密度决定了微电池与应用于物联网的微电子器件集成时所需的面积.目前,由于微电子器件尺寸有限,微电池的实际应用受到低面积功率密度的限制.本文研究发现,经过原位等离子体预处理衬底后,溅射的铁氧硫... 详细信息

作为微电池的核心指标之一,面积功率密度决定了微电池与应用于物联网的微电子器件集成时所需的面积.目前,由于微电子器件尺寸有限,微电池的实际应用受到低面积功率密度的限制.本文研究发现,经过原位等离子体预处理衬底后,溅射的铁氧硫化物薄膜(FeOxSy)具备超高功率特性.这种原位等离子体预处理可作为一种通用的界面优化策略来抑制长循环过程中的机械衰变.该正极薄膜展现出极高的功率密度和稳定的循环性能,这是由其高度的结构完整性(强大的界面粘附性和应力释放的岛)、完美的电化学可逆性以及近表面电荷交换(赝电容锂存储机制)的协同作用导致的.预处理的FeOxSy薄膜可以输出高达14.6 mW cm-2的功率密度和291μW h cm^(-2)μm^(-1)的体积能量密度.制备得到的正极薄膜的功率密度优于已报道的具有相当面积容量的溅射薄膜.本工作提出了一种简单且高效的预处理方法来制备具有超高功率密度且稳定的微电池薄膜电极.

关键词：微电子器件高功率密度微电池循环过程界面优化超高功率薄膜电极应力释放

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