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The promises, challenges and pathways to room-temperature sodium-sulfur batteries

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National Science Review 2022年第3期9卷 144-168页

作者： Lei wang Tao wang Lele Peng yiliu wang Meng Zhang Jian Zhou Maoxin Chen Jinhui Cao Huilong Fei Xidong Duan Jian Zhu Xiangfeng Duan State Key Laboratory for Chemo Biosensing and Chemometricsand College of Chemistry and Chemical EngineeringHunan Key Laboratory of Two-Dimensional Materials Hunan University Department of Chemistry and Biochemistry University of CaliforniaLos Angeles

Room-temperature sodium-sulfur batteries(RT-Na-S batteries) are attractive for large-scale energy storage applications owing to their high storage capacity as well as the rich abundance and low cost of the ***, their practical application is hampered by severe challenges, such as low conductivity of sulfur and its reduced products, volume expansion, polysulfide shuttling effect and Na dendrite formation,which can lead to rapid capacity fading. The review discusses the Na-S-energy-storage chemistry,highlighting its promise, key challenges and potential strategies for large-scale energy storage ***, we review the electrochemical principles and the current technical challenges of RT-Na-S batteries, and discuss the strategies to address these obstacles. In particular, we give a comprehensive review of recent progresses in cathodes, anodes, electrolytes, separators and cell configurations, and provide a forward-looking perspective on strategies toward robust high-energy-density RT-Na-S batteries.

关键词： room-temperature sodium-sulfur batteries sulfur cathodes polysulfide shuttling effects Na dendrite formation electrocatalysis

A Silicon Monoxide Lithium-Ion Battery Anode with Ultrahigh Areal Capacity

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Nano-Micro Letters 2022年第3期14卷 229-243页

作者： Jiang Zhong Tao wang Lei wang Lele Peng Shubin Fu Meng Zhang Jinhui Cao Xiang Xu Junfei Liang Huilong Fei Xidong Duan Bingan Lu yiliu wang Jian Zhu Xiangfeng Duan State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringSchool of Physics and ElectronicsHunan Key Laboratory of Two‑Dimensional MaterialsEngineering Research Center of Advanced Catalysis of the Ministry of EducationHunan UniversityChangsha 410082People’s Republic of China International Graduate School at Shenzhen Tsinghua UniversityShenzhen 518057People’s Republic of China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information TechnologyHarbin Institute of TechnologyHarbin 150090People’s Republic of China School of Energy and Power Engineering North University of ChinaTaiyuan 030051People’s Republic of China Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCA 90095USA

Silicon monoxide(SiO)is an attractive anode material for next-generation lithium-ion batteries for its ultra-high theoretical capacity of 2680 mAh g−*** studies to date have been limited to electrodes with a rela-tively low mass loading(<3.5 mg cm^(−2)),which has seriously restricted the areal capacity and its potential in practical *** areal capacity with such high-capacity materials is critical for capitalizing their potential in practi-cal ***,we report a monolithic three-dimensional(3D)large-sheet holey gra-phene framework/SiO(LHGF/SiO)composite for high-mass-loading *** specifically using large-sheet holey graphene building blocks,we construct LHGF with super-elasticity and exceptional mechanical robustness,which is essential for accommodating the large volume change of SiO and ensuring the structure integrity even at ultrahigh mass ***,the 3D porous graphene network structure in LHGF ensures excellent electron and ion *** systematically tailoring microstructure design,we show the LHGF/SiO anode with a mass loading of 44 mg cm^(−2)delivers a high areal capacity of 35.4 mAh cm^(−2)at a current of 8.8 mA cm^(−2)and retains a capacity of 10.6 mAh cm^(−2)at 17.6 mA cm^(−2),greatly exceeding those of the state-of-the-art commercial or research ***,we show an LHGF/SiO anode with an ultra-high mass loading of 94 mg cm^(−2)delivers an unprecedented areal capacity up to 140.8 mAh cm^(−2).The achievement of such high areal capacities marks a critical step toward realizing the full potential of high-capacity alloy-type electrode materials in practical lithium-ion batteries.

关键词： Silicon monoxide Large-sheet holey graphene Lithium-ion batteries High mass loading Ultra-high areal capacity

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Suppressed threshold voltage roll-off and ambipolar transport in multilayer transition metal dichalcogenide feed-back gate transistors

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Nano Research 2020年第7期13卷 1943-1947页

作者： Yang Liu Peiqi wang yiliu wang Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of CaliforniaLos AngelesLos AngelesCA 90095USA Department of Materials Science and Engineering University of CaliforniaLos AngelesLos AngelesCA 90095USA California Nanosystems Institute University of CaliforniaLos AngelesLos AngelesCA 90095USA

The layered semiconducting transition metal dichaloogenides(S-TMDs)have attracted considerable interest as the channel material for field-effect transistors(FETs).However,the multilayer S-TMD transistors usually exhibit considerable threshold voltage(Vn)shit and ambipolar behavior at high source-drain bias,which is undesirable for modern digital *** we report the design and fabrication of double feedback gate(FBG)transistors,i.e.,source FBG(S-FBG)and drain FBG(D-FBG),to combat these *** FBG transistors differ from normal transistors by including an extra feedback gate,which is directly connected t0 the source/drain electrodes by extending and overlapping the source/drain electrodes over the yttrium oxide dielectrics on *** show that the S-FBG transistors based on mutilayer MoSg exhibit nearly negligible VIn rlloff at large source drain bias,and the D-FBG mutilayer WSe2 transistors could be tailored into either n-type or p-type transport,depending on the polarity of the drain *** double FBG structure offers an effective strategy to tailor multilayer s-TMD transistors with suppressed Vn roll-off and ambipolar transport for high-performance and low-power logic applications.

关键词： two-dimensional transition metal dichalcogenides feedback gate transistor threshold voltage roll-off ambipolar behavior tailoring

矿物钾肥在中国典型植烟土壤中钾素转化特性及对烟叶提钾效果的初步评估

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中国农学通报 2024年第21期40卷 84-90页

作者：李冬雪刘新源宋正熊李豪豪赵世民王一柳郇威威王火焰卢殿君陈小琴王玉洁中国科学院南京土壤研究所土壤与可持续农业国家重点实验室南京210008 中国科学院大学北京100049 河南省烟草公司三门峡分公司河南三门峡472000 河南省烟草公司洛阳分公司河南洛阳471023

本研究旨在探究不同形态钾肥对提高烟田土壤质量和生产力的影响。通过室内培养试验和田间试验,评估了施用不同钾肥后土壤中钾素的生物有效性。在室内培养试验中,分析了3种钾肥处理后土壤中非交换性钾(NEK)、交换性钾(EK)和水溶性钾(WSK... 详细信息

本研究旨在探究不同形态钾肥对提高烟田土壤质量和生产力的影响。通过室内培养试验和田间试验,评估了施用不同钾肥后土壤中钾素的生物有效性。在室内培养试验中,分析了3种钾肥处理后土壤中非交换性钾(NEK)、交换性钾(EK)和水溶性钾(WSK)的含量变化。结果显示,这三种钾素形态分别占17.7%~83.9%、11.1%~56.0%和2.3%~36.3%。在不同地区(西南、黄淮和东北)的实验中,施用硅基钾肥显著提高了EK和NEK含量,提升幅度分别为26.3%和18.1%、30.8%和24.5%、36.3%和42.7%。利用灰色关联分析发现,土壤全钾含量、质地和矿物组成是影响NaBPh4提钾量的主要影响因子。在田间试验中,与不施钾处理相比,部分用硅基钾肥替代硫酸钾能显著提高烟草产量(增加8.7%)和钾含量(增加66.6%),同时降低烟田土壤速效钾残留量。综上所述,硅基钾肥可有效维持甚至提升土壤钾素供应能力,其部分替代传统钾肥可显著提升烟草产质量。针对硅基钾肥替代传统钾肥的最佳比例,值得进一步研究探讨。

关键词：土壤钾素交换性钾非交换性钾硅基钾肥四苯硼钠生物有效性烟草产量土壤质量烟草

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Chemical vapor deposition growth of single-crystalline cesium lead halide microplatelets and heterostructures for optoelectronic applications

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Nano Research 2017年第4期10卷 1223-1233页

作者： yiliu wang Xun Guan Dehui Li Hung-Chieh Cheng Xidong Duan Zhaoyang Lin Xiangfeng Duan Department of Chemistry and Biochemistry University of California Los Angeles Los Angeles CA 90095 USA State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha 410082 China School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Department of Materials Science and Engineering University of California Los Angeles Los Angeles CA 90095 USA California NanoSystems Institute University of California Los Angeles Los Angeles CA 90095 USA

Organic-inorganic hybrid halide perovskites, such as CH3NHgPbI3, have emerged as an exciting class of materials for solar photovoltaic applications; however, they are currently plagued by insufficient environmental stability. To solve this issue, all-inorganic halide perovskites have been developed and shown to exhibit significantly improved stability. Here, we report a single-step chemical vapor deposition growth of cesium lead halide （CsPbX3） microcrystals. Optical microscopy studies show that the resulting perovskite crystals predominantly adopt a square-platelet morphology. Powder X-ray diffraction （PXRD） studies of the resulting crystals demonstrate a highly crystalline nature, with CsPbC13, CsPbBr3, and CsPbI3 showing tetragonal, monoclinic, and orthorhombic phases, respectively. Scanning electron microscopy （SEM） and atomic force microscopy （AFM） studies show that the resulting platelets exhibit well-faceted structures with lateral dimensions of the order of 10-50 μm, thickness around 1 μm, and ultra-smooth surface, suggesting the absence of obvious grain boundaries and the single-crystalline nature of the individual microplatelets. Photoluminescence （PL） images and spectroscopic studies show a uniform and intense emission consistent with the expected band edge transition. Additionally, PL images show brighter emission around the edge of the platelets, demonstrating a wave-guiding effect in high-quality crystals. With a well-defined geometry and ultra-smooth surface, the square platelet structure can function as a whispering gallery mode cavity with a quality factor up to 2,863 to support laser emission at room temperature. Finally, we demonstrate that such microplatelets can be readily grown on a variety of substrates, including silicon, graphene, and other two-dimensional materials such as molybdenum disulfide, which can readily allow the construction of heterostructure optoelectronic devices, including a graphene/perovskite/ graphene vertically-stacked pho

关键词： chemical vapor deposition inorganic perovskite microplatelets photoluminescence optical cavity photodetection

Ultrathin wavy Rh nanowires as highly effective electrocatalysts for methanol oxidation reaction with ultrahigh ECSA

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Nano Research 2019年第1期12卷 211-215页

作者： Xiaoyang Fu Zipeng Zhao Chengzhang Wan yiliu wang Zheng Fan Frank Song Bocheng Cao Mufan Li wang Xue Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA Department of Materials Science and Engineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA California Nanosystems Institute University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA

Direct methanol fuel cells (DMFCs) have received tremendous research interests because of the facile storage of liquid methanol ***,the DMFC today is severely plagued by the poor kinetics and rather high overpotential in methanol oxidation reaction (MOR).Here we report the investigation of the ultrathin Rh wavy nanowires as a highly effective MOR *** show that ultrathin wavy Rh nanowires can be robustly synthesized with 2-3 nm *** studies show a current peak at the potential of 0.61 V *** hydrogen electrode (RHE),considerably lower than that of Pt based catalysts (~ 0.8-0.9 V ***).Importantly,with ultrathin diameters and favorable charge transport,the Rh nanowires catalysts exhibit an ultrahigh electrochemically active surface area determined from CO-stripping (ECSAco) of 144.2 m2/g,far exceeding that of the commercial Rh black samples (20 m2/g).Together,the Rh nanowire catalysts deliver a mass activity of 722 mA/mg at 0.61 V,considerably higher than many previously reported electrocatalysts at the same *** chronoamperometry studies also demonstrate good stability and CO-tolerance compared with the Rh black control sample,making ultrathin Rh wavy nanowires an attractive electrocatalyst for MOR.

关键词： rhodium nanowires electrocatalysis methanol oxidation reaction (MOR)

Highly-anisotropic optical and electrical properties in layered SnSe

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Nano Research 2018年第1期11卷 554-564页

作者： Shengxue Yang Yuan Liu Minghui Wu Li-Dong Zhao Zhaoyang Lin Hung-chieh Cheng yiliu wang Chengbao Jiang Su-Huai Wei Li Huang Yu Huang Xiangfeng Duan [1Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA [2School of Materials Science and Engineering Beihang University Beiing I00191 China [3Department of Materials Science and Engineering University of Califomia Los Angeles CA 90095 USA [4Department of Physics South University of Science and Technology of China Shenzhen 518005 China [5Beijing Computational Science Research Center Beijing 100094 China [6California Nanosystems Institute University of California Los Angeles CA 90095 USA

Anisotropic materials are of considerable interest because of their unique combination of polarization- or direction-dependent electrical, optical, and thermoelectric properties. Low-symmetry two-dimensional （2D） materials formed by van der Waals stacking of covalently bonded atomic layers are inherently anisotropic. Layered SnSe exhibits a low degree of lattice symmetry, with a distorted NaC1 structure and an in-plane anisotropy. Here we report a systematic study of the in-plane anisotropic properties in layered SnSe, using angle-resolved Raman scattering, optical absorption, and electrical transport studies. The optical and electrical characterization was direction-dependent, and successfully identified the crystalline orientation in the layered SnSe. Furthermore, the dependence of Raman-intensity anisotropy on the SnSe flake thickness and the excitation wavelength were investigated by both experiments and theoretical calculations. Finally, the electrical transport studies demonstrated that few-layer SnSe field- effect transistors （FETs） have a large anisotropic ratio of carrier mobility （N 5.8） bet- ween the armchair and zigzag directions, which is a record high value reported for 2D anisotropic materials. The highly-anisotropic properties of layered SnSe indicate considerable promise for anisotropic optics, electronics, and optoelectronics.

关键词： layered SnSe anisotrop^angle-resolved transports polarized Raman scattering angle-resolved opticalabsorption

Quantitative Surface Plasmon Interferometry via Upconversion Photoluminescence Mapping

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Research 2019年第1期2019卷 551-562页

作者： Anxiang Yin Hao Jing Zhan Wu Qiyuan He yiliu wang Zhaoyang Lin Yuan Liu Mengning Ding Xu Xu Zhe Fei Jianhui Jiang Yu Huang Xiangfeng Duan Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCalifornia 90095USA School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100008China Department of Materials Science and Engineering University of CaliforniaLos AngelesCalifornia 90095USA State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Physics&Astronomy Iowa State UniversityAmesIowa 50011USA California NanoSystems Institute University of CaliforniaLos AngelesCalifornia 90095USA

Direct far-field visualization and characterization of surface plasmon polaritons(SPPs)are of great importance for fundamental studies and technological *** probe the evanescently confined plasmon fields,one usually requires advanced near-field techniques,which is typically not applicable for real-time,high-throughput detecting or mapping of SPPs in complicated ***,we report the utilization of rare-earth-doped nanoparticles to quantitatively upconvert invisible,evanescently confined SPPs into visible photoluminescence emissions for direct far-field visualization of SPPs in a complicated *** observed interference fringes between the SPPs and the coherent incident light at the metal surface provide a quantitative measurement of the SPP wavelength and the SPP propagating length and the local dielectric *** thus creates a new signaling pathway to sensitively transduce the local dielectric environment change into interference periodicity variation,enabling a new design of directly measurable,spectrometer-free optical rulers for rapid,ultrasensitive label-free detection of various biomolecules,including streptavidin and prostate-specific antigen,down to the femtomolar level.

关键词： visible dielectric measurable

基于量子点-双边光学腔的两自由度并行非定域Toffoli门远程实现

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中国科学：物理学、力学、天文学 2022年第12期52卷 50-60页

作者：陆湘琪王译柳陈孟钒杨真仙黄翠钰周萍广西民族大学量子信息与量子光学重点实验室南宁530006 广西民族大学数学与物理学院南宁530006

三量子比特Toffoli门非定域远程实现在量子通讯网络、分布式量子计算中有重要应用.已有的Toffoli门非定域远程实现方案大都基于量子系统单一自由度,本文提出超纠缠信道下基于量子点-双边光学腔的两自由度并行非定域Toffoli门远程实现方... 详细信息

三量子比特Toffoli门非定域远程实现在量子通讯网络、分布式量子计算中有重要应用.已有的Toffoli门非定域远程实现方案大都基于量子系统单一自由度,本文提出超纠缠信道下基于量子点-双边光学腔的两自由度并行非定域Toffoli门远程实现方案.通讯方Alice,Bob使手中光子依次进入量子点-双边光学腔,对光学腔中电子以及纠缠光子执行单粒子测量;Charlie依据纠缠光子单粒子测量结果,执行相应局域幺正操作和极化、路径自由度单粒子测量.Alice和Bob依据单粒子测量结果执行相应局域幺正变换即可完成两自由度并行非定域Toffoli门远程实现.方案以极化、路径两自由度超纠缠光子为量子纠缠信道,具有信道容量高、并行性强的优点.

关键词：并行非定域Toffoli门超纠缠量子点-双边光学腔

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