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Crystal-phase-controlled PtSn intermetallic nanowires for efficient methanol oxidation

science China Chemistry 2024年第12期67卷 4142-4148页

作者： Siyu Cao Mengfan Li Zihan Guo Li Gong Yangfan Lu Wenhua Zhang Yu Ni Lei Gao Chao Ma Hongwen Huang College of Materials Science and Engineering Changsha University of Science and TechnologyChangsha 410114China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Zhejiang Provincial Engineering Research Center of Oxide Semiconductors for Environmental and Optoelectronic Applications Institute of WenzhouZhejiang UniversityWenzhou 325006China State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027China Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China China Power Engineering Consulting Group Co. LTDBeijing 100120China Shenzhen Research Institute of Hunan University Shenzhen 518055China

Developing highly efficient Pt-based methanol oxidation reaction(MOR)catalysts is pivotal for direct methanol fuel *** engineering of nanomaterials offers a promising strategy to improve their catalytic performance,yet achieving phase modulation in one-dimensional nanowires(NWs)remains a great ***,we report a facile and one-pot synthesis approach for the crystal-phase-controlled Pt-Sn intermetallic nanowires(NWs),realizing the crystal-phases regulation of face-centered cubic Pt_(3)Sn intermetallic NWs(FCC-Pt_(3)Sn INTNWs)and hexagonal close-packed Pt Sn intermetallic NWs(HCP-PtSn INTNWs)by adjusting the amounts of Sn ***,the FCC-Pt_(3)Sn INTNWs exhibit high mass and specific activities of 6.4 A mg_(Pt)^(-1)and 11.8 mA cm^(-2),respectively,surpassing its counterparts,the HCP-PtSn INTNWs and commercial Pt/C *** a 10,000 s durability test,the FCC-Pt_(3)Sn INTNWs still maintain a mass activity of 5.6 A mg_(Pt)^(-1),which is 24.3 times higher than that of commercial Pt/C *** dramatic enhancement of MOR performance is primarily attributed to the phasecontrolled structure and accelerated removal of CO intermediates(CO*).Theoretical calculations and CO stripping experiments demonstrate that the FCC-Pt_(3)Sn INTNWs lower the energy barrier for converting CO*into COOH*by reducing CO*binding and enhancing OH adsorption,thus significantly improving the MOR activity,CO tolerance,and stability.

关键词： Pt-Sn intermetallic nanowires crystal phase methanol oxidation reaction anti-CO poisoning

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Resonance analysis of^(159)Tb(n,γ)reaction based on the CSNS Back-n experiment

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Nuclear science and Techniques 2025年第3期36卷 85-94页

作者： De-Xin Wang Su-Ya-La-Tu Zhang Wei Jiang Jie Ren Mei-Rong Huang Jing-Yu Tang Xi-Chao Ruan Hong-Wei Wang Long-Xiang Liu Xue Li Dan-Dan Niu Guo Li Gu-Fu Meng Yong-Shun Huang Zhi-Long Wang Yu Bai Xue Yang College of Physics and Electronics and Institute of Nuclear PhysicsInner Mongolia Minzu UniversityTongliao 028043China Inner Mongolia Joint Key Laboratory of Nuclear and Radiation Detection Tongliao 028043China Chinese Academy of Sciences Institute of High Energy PhysicsBeijing 10049China Spallation Neutron Source Science Center Dongguan 523803China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Chinese Academy of Sciences Shanghai Advanced Research InstituteShanghai 201210China Center for Theoretical Physics China Institute of Atomic EnergyBeijing 102413China

The neutron capture resonance parameters for 159Tb are crucial for validating nuclear models,nucleosynthesis during the neutron capture process,and nuclear technology *** this study,resonance analyses were performed for the neutron capture cross sections of 159Tb measured at the China Spallation Neutron Source(CSNS)backscattering white neutron beamline(Back-n)*** resonance parameters were extracted from the R-Matrix code SAMMY and fitted to the experimental capture yield up to the 1.2 keV resolved resonance region(RRR).The average resonance parameters were determined by performing statistical analysis on the set of the resonance parameters in the *** results were used to fit the measured average capture cross sections using the FITACS code in the unresolved resonance region from 2 keV to 1 *** contributions of partial waves l=0,1,2 to the average capture cross sections are reported.

关键词： Statistical analysis Resonance parameters ^(159)Tb(n,γ)cross section γ

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Acceptor-planarized typeⅠphotosensitizer for lipid droplet-targeted two-photon photodynamic therapy by ferroptosis

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science China Chemistry 2024年第7期67卷 2392-2402页

作者： Jie Sha Weimin Liu Jiasheng Wu Yanping Wang Xuewei Li Haohui Ren Zhi Pang Wenjun Zhang Chun-Sing Lee Pengfei Wang Key Laboratory of Photochemical Conversion and Optoelectronic Materials CityU-CAS Joint Laboratory of Functional Materials and DevicesTechnical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China School of Future Technology University of Chinese Academy of SciencesBeijing 100049China Center of Super-Diamond and Advanced Films&Department of Materials Science and Engineering City University of Hong KongHong KongChina

Two-photon photodynamic therapy(TP-PDT)has garnered significant attention because of its excellent depth of tissue penetration and high spatiotemporal ***,the limited targeting ability and oxygen dependency of photosensitizers(PSs)significantly hinder the effectiveness of photodynamic therapy in hypoxic tumor ***,we designed and synthesized two lipid droplet(LD)-targeted two-photon PSs(TBPCP and TBCP)by reducing benzene rings to achieve“acceptor planarization”.Notably,acceptor planarization not only enhanced the intramolecular charge transfer but also transferred the photochemical reaction from typeⅡ(TBPCP)to typeⅠ(TBCP).Under the irradiation of 940 nm femtosecond pulsed laser,TBPCP and TBCP showed bright two-photon-excited fluorescence and excellent LD targeting in living *** TBPCP(typeⅡPS),the outstanding TP-PDT efficacy of TBCP(typeⅠPS)under hypoxic conditions could be obtained in both cellular experiments and multicellular tumor spheroids(MCTS)***,both TBPCP and TBCP could induce the lipid peroxidation in the typeⅠor typeⅡPDT due to the location of LD,depleting GSH and inactivating GPX4 to induce nonprogrammed ferroptosis in cells.

关键词： two-photon photodynamic therapy lipid droplet targeting acceptor planarization hypoxia tumor ferroptosis

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Investigation of phase modulation and propagation-route effect from unmatched large-scale structures for Doppler reflectometry measurement through 2D full-wave modeling

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Plasma science and technology 2023年第11期25卷 55-65页

作者：冯喜刘阿娣周楚邹晓岚庄革王守信王明远刘海庆丁卫星张寿彪吴木泉朱翔郝保龙张津刘朝阳季佳旭仲小明刘深谢锦林林晓东黄建军高翔万元熙 College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060Peopleʼs Republic of China Advanced Energy Research Center Shenzhen UniversityShenzhen 518060Peopleʼs Republic of China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026Peopleʼs Republic of China Institute for Magnetic Fusion Research CEASaint-Paul-lez-Durance F-13115France Institute of Plasma Physics Chinese Academy of SciencesHefei 230031Peopleʼs Republic of China Hebei Key Laboratory of Compact Fusion Langfang 065001Peopleʼs Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001Peopleʼs Republic of China

To interpret the common symmetric peaks caused by the large-scale structure in the complex S(f)spectrum from the heterodyne Doppler reflectometry(DR)measurement in EAST,a 2D circular-shaped O-mode full-wave model based on the finite-difference time-domain method is *** scattering characteristics and the influences on the DR signal from various scales are *** the structure is located around the cutoff layer,a moving radial or poloidal large-scale structure k_(θ)k_(θ),match(k_(θ),match is the theoretic wavenumber of Bragg scattering)could both generate an oscillation phase term called‘phase modulation’,and symmetrical peaks in the complex S(f)*** was found that the image-rejection ratio A_(−1)/A_(+1)(A_(±1)represents the amplitudes of±1 order modulation peaks)could be a feasible indicator for experiment *** the case when the structure is near the cutoff layer with the same arrangement as the experiment for the edge DR channel,the curve of A_(−1)/A_(+1)versus kθcan be divided into three regions,weak asymmetrical range with k_(θ)/k_(0)0.15(k_(0)is the vacuum wavenumber),harmonics range with 0.15k_(θ)/k_(0)0.4,and Bragg scattering range of 0.4k_(θ)/k_(0)*** the case when the structure is located away from the cutoff layer,the final complex S(f)spectrum is the simple superimposing of modulation and Bragg scattering,and the modulation peaks have an amplitude response nearly proportional to the local density fluctuation,called the‘propagationroute effect’.Under the H-mode experiment arrangement for the core DR,a critical fluctuation amplitude Amp(n_(e,Mod.@route))/Amp(n_(e,Tur.@MSA)∼1.3–4.1(Amp(n_(e,Mod.@route))refers to the pedestal large-scale structure amplitude and Amp(ne,Tur.@MSA)refers to turbulence amplitude at the main scattering area)is needed for the structure in the pedestal to be observed by the core DR *** simulations are well consistent with the experimental *** effects need to be carefully c

关键词： Doppler reflectometry full-wave simulation propagation-route effect

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MoTe_(2)/Ta_(2)NiSe_(5)/MoTe_(2)范德华双异质结实现超快、宽带和偏振敏感光电探测器

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science China Materials 2024年第7期67卷 2182-2192页

作者：张洁莲黎思娜朱玲玉郑涛李翎邓群睿潘志东江美华杨亚妮林月蓉李京波霍能杰 School of Semiconductor Science and Technology South China Normal UniversityFoshan 528225China College of Physics and Optoelectronic Engineering Zhejiang UniversityHangzhou 310000China Guangdong Provincial Key Laboratory of Chip and Integration Technology Guangzhou 510631China

高效光电探测器在监控、热成像、光通信和环境监测等领域具有广泛、迫切的应用需求.优化光电探测器参数如微型化、高量子效率、超快响应速度等,仍然是一项艰巨的任务.我们提出了一种由顶部/底部MoTe_(2)和中间Ta_(2)NiSe_(5)层组成的双... 详细信息

高效光电探测器在监控、热成像、光通信和环境监测等领域具有广泛、迫切的应用需求.优化光电探测器参数如微型化、高量子效率、超快响应速度等,仍然是一项艰巨的任务.我们提出了一种由顶部/底部MoTe_(2)和中间Ta_(2)NiSe_(5)层组成的双范德华异质结.利用双异质结界面增强光收集效率和产生两个对立的内置电场,使得器件具有400到1550 nm的宽光谱响应,并表现出优异的性能,包括82.9%的外量子效率和3.5/4.2μs的快速响应速度.此外,利用二维Ta_(2)NiSe_(5)纳米片的面内各向异性,我们实现了在635和1550 nm波长下的极化灵敏度,分别为16.3和8.1.这项研究为开发高性能和多功能光电探测器提供了平台,为先进光电器件的设计和应用提供了新的方向.

关键词： polarimetric photodetector TazNiSes/MoTe_(2)het-erojunction photovoltaic polarization sensitivity

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Passively stable 0.7-octave microcombs in thin-film lithium niobate microresonators

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Chinese Optics Letters 2024年第5期22卷 53-56页

作者：赵泽兴王晨宇邱静远叶志霖尹志军王振林贾琨鹏田晓慧谢臻达祝世宁 National Laboratory of Solid State Microstructures School of Electronic Science and EngineeringSchool of PhysicsCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Nanzhi Institute of Advanced Optoelectronic Integration Technology Co. Ltd.Nanjing 210093China

The optical frequency comb based on microresonators(microcombs)is an integrated coherent light source and has the potential to promise a high-precision frequency standard;self-reference and a long-term stable microcomb are the keys to this ***,we demonstrated a 0.7-octave spectrum Kerr comb via dispersion engineering in a thin-film lithium niobate microresonator,and the single-soliton state can be accessed passively with long-term stability over 3 *** such a robust broadband coherent comb source using thin-film lithium niobate,a fully stabilized microcomb can be expected for massive practical applications.

关键词： thin-film lithium niobate soliton microcomb photorefractive effect

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Single exposure passive three-dimensional information reconstruction based on an ordinary imaging system

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Chinese physics B 2023年第11期32卷 446-455页

作者：窦申成刘璠李虎姚旭日刘雪峰翟光杰 Key Laboratory of Electronics and Information Technology for Space Systems National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Laboratory of Satellite Mission Operation National Space Science CenterChinese Academy of SciencesBeijing 100190China Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements(MOE) School of PhysicsBeijing Institute of TechnologyBeijing 100081China Beijing Academy of Quantum Information Sciences Beijing 100193China

Existing three-dimensional(3D) imaging technologies have issues such as requiring active illumination, multiple exposures, or coding modulation. We propose a passive single 3D imaging method based on an ordinary imaging *** the point spread function of the imaging system to realize the non-coding measurement on the target, the full-focus images and depth information of the 3D target can be extracted from a single two-dimensional(2D) image through the compressed sensing algorithm. Simulation and experiments show that this approach can complete passive 3D imaging based on an ordinary imaging system without any coding operations. This method can achieve millimeter-level vertical resolution under single exposure conditions and has the potential for real-time dynamic 3D imaging. It improves the efficiency of 3D information detection, reduces the complexity of the imaging system, and may be of considerable value to the field of computer vision and other related applications.

关键词： passive three-dimensional imaging single exposure point spread function compressed sensing

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Minimizing Carbon Content with Three-in-One Functionalized Nano Conductive Ceramics:Toward More Practical and Safer S Cathodes of Li-S Cells

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Energy & Environmental Materials 2023年第3期6卷 31-39页

作者： Ning Li Chang Sun Jianhui Zhu Shun Li Yanlong Wang Maowen Xu Changming Li Jian Jiang School of Materials and Energy and Chongqing Key Lab for Advanced Materials and Clean Energies of TechnologiesSouthwest UniversityChongqing 400715China School of Physical Science and Technology Southwest UniversityChongqing 400715China Key Laboratory of Chemical Lasers Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry and Chemical Engineering Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Provinceand Key Laboratory of Functional Materials and Photoelectrochemistry of HaikouHainan Normal UniversityHaikou 571158China

Using porous carbon hosts in cathodes of Li-S cells can disperse S actives and offset their poor electrical ***,such reservoirs would in turn absorb excess electrolyte solvents to S-unfilled regions,causing the electrolyte overconsumption,specific energy decline,and even safety hazards for battery *** build better cathodes,we propose to substitute carbons by In-doped SnO_(2)(ITO)nano ceramics that own three-in-one functionalities:1)using conductive ITO enables minimizing the total carbon content to an extremely low mass ratio(~3%)in cathodes,elevating the electrode tap density and averting the electrolyte overuse;2)polar ITO nanoclusters can serve as robust anchors toward Li polysulfide(LiPS)by electrostatic adsorption or chemical bond interactions;3)they offer catalysis centers for liquid–solid phase conversions of S-based ***,such ceramics are intrinsically nonflammable,preventing S cathodes away from thermal runaway or *** merits entail our configured cathodes with high tap density(1.54 g cm^(−3)),less electrolyte usage,good security for flame retardance,and decent Li-storage *** lean and LiNO_(3)-free electrolyte,packed full cells exhibit excellent redox kinetics,suppressed LiPS shuttling,and excellent *** may trigger great research enthusiasm in rational design of low-carbon and safer S cathodes.

关键词： flame retardance Li-S cells minimized carbon ratio nano conductive ceramics three-in-one functionality

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Enhanced desorption property of hydrochromic material NiI_(2)by organic hybridization

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Rare Metals 2022年第5期41卷 1529-1536页

作者： Ming-Peng Huang Jin-Yong Hu Qian-Wei Xiang Jia-Bei Liu Jian-Xu Ren Meng-Qi Yin Jue-Xian Cao Yong Zhang School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Xiaoxiang College Hunan University of Science and TechnologyXiangtan 411201China Hunan Institute of Advanced Sensing and Information Technology Xiangtan UniversityXiangtan 411105China

Hydrochromic materials have attracted increasing attention due to the visual color change behaviors,but the disadvantage of slow color change and irreversibility are still serious obstacles to achieve practical applic... 详细信息

关键词： property disadvantage application

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Multiple transition metals modulated hierarchical networks for high performance of metal-ion batteries

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Journal of Energy Chemistry 2022年第7期31卷 604-613,I0015页

作者： Jie Liu Chenjie Lou Jipeng Fu Xuan Sun Jingrong Hou Jiwei Ma Yongjin Chen Xiang Gao Ligang Xu Qi Wei Mingxue Tang Center for High Pressure Science and Technology Advanced Research Beijing 100094China Institute of Optoelectronic Materials and Devices China Jiliang UniversityHangzhou 310018ZhejiangChina Institute of New Energy for Vehicles School of Materials Science and EngineeringTongji UniversityShanghai 201804China College of Materials Science and Engineering Beijing University of TechnologyBeijing 100124China

Searching anodes with excellent electrochemical performance has been in great demand for rechargeable metal ion batteries. In this contribution, Fe/Co co-doped Ni S with N-based carbon(Fe Co-NiS@NC) derived from trimetallic Prussian blue analogue is designed and synthesized. The composition can be easily adjusted and modulated by multi-metals. In addition, the well-designed carbon nanocubes effectively promote electronic conductivity and buffer the volume change upon charge and discharge cycling, resulting in good capacity and long-term cycle life for both lithium-ion batteries and sodium-ion batteries, with capacities of 1018 m Ah g^(-1)(vs. Li/Li^(+)) and 454 m Ah g^(-1)(vs. Na/Na^(+)), respectively, after 100 *** studies indicate that the electrochemical behaviors are manipulated by both diffusion and pseudocapacitance processes. These strategies would open new opportunities and potention for novel energy storage.

关键词： Multiple transition metallic synergy Li-ion batteries Solium-ion batteries In-situ XRD Long-term cycling stability High coulumbic efficiency

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