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Improving hydrogen evolution reaction efficiency through lattice tuning

Nano Research 2024年第7期17卷 5907-5913页

作者： Zipeng Zhao Haotian Liu Wenpei Gao Praveen Kolla Wang Xue Zeyan Liu Jinghua Guo Sanjeev Mukerjee Xiaoqing Pan Qingying Jia xiangfeng duan Yu Huang Department of Materials Science and Engineering University of CaliforniaLos AngelesCalifornia 90095USA Department of Chemical Engineering and Materials Science University of CaliforniaIrvineCalifornia 92697USA Materials Science and Engineering North Carolina State UniversityRaleighNorth Carolina 27695USA Department of Chemistry and Chemical Biology Northeastern UniversityBostonMassachusetts 02115USA Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCalifornia 90095USA Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCalifornia 95064USA Department of Physics and Astronomy University of CaliforniaIrvineCalifornia 92697USA California Nanosystems Institute University of CaliforniaLos AngelesCalifornia 90095USA

The intermittent nature of renewable energy sources sets a requirement for efficient energy storage to mitigate the conflict between energy supply and *** is a promising choice for energy storage due to its high energy ***,the conversion of electrical energy to chemical energy stored in hydrogen through water electrolysis suffers from low efficiency,and the electricity cost dominates the total cost of hydrogen ***,we report the study of improving the hydrogen evolution reaction activity of Pt-based catalysts by building a nanoscale surface NiO and Pt interface,further optimizing the performance via tuning the lattice parameter of the core of nanoparticles,which can be achieved by varying the dealloying annealing *** optimized PtCuNi-O/C and PtNi-O/C catalysts are demonstrated to be one of the best catalysts,with a mass activity(MA)of 9.1 and 8.7 mA/μgPt,which is 9.9-fold and 9.5-fold of that of Pt/C,respectively.

关键词： lattice tuning Pt-based catalyst hydrogen evolution reaction electrocatalysis

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Van der Waals superlattices

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National Science Review 2022年第5期9卷 14-16页

作者： Huaying Ren Zhong Wan xiangfeng duan Department of Chemistry and Biochemistry University of California California Nano Systems Institute University of California

Semiconductor technology has enabled many essential devices,including transistors for computing and communication,diodes for solid-state lighting and *** all these devices,the material foundation is a series of highly elaborated heterostructures and superlattices[1].To this end,integrating different materials into heterostructures or superlattices with well-defined spatial modulation of chemical compositions and electronic structures is central for generating designed electronic functions and has been a continued pursuit of the materials science community.

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Hot graphene sponge cleans viscous crude-oil spill

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Science China Materials 2017年第7期60卷 681-682页

作者： xiangfeng duan Department of Chemistry and Biochemistry University of California

Ocean crude oil spill can cause instant and lasting damage to marine ecosystem,leading to disastrous environmental,economical and social consequences[1,2].The 2010 Gulf oil spill has cost British Petroleum over $60 bi... 详细信息

关键词：英语阅读理解材料科学

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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

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The Nano Research Young Innovators(NR45)Awards in twodimensional materials

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Nano Research 2021年第6期14卷 1575-1582页

作者： xiangfeng duan Qihua Xiong Department of Chemistry University of CaliforniaLos AngelesLos AngelesCA90095USA State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing100084China Beijing Academy of Quantum Information Sciences Beijing100193China

Nano Research launched the Nano Research Young Innovator Awards(NR45)program in 2018 to feature young researchers under the age of 45 in various fields of nanoscience and nano-technology,in recognition of their distinguished accomplishments and/or potential to make substantial contributions to their *** NR45 awardees were selected through a competitive process by an award committee from the journal's editorial *** 2021 NR45 Awards focus on the topic area of two-dimensional(2D)materials,and highlight 35 innovators in cognitions of their extraordinary contributions to this rapidly expanding *** to all the 35 outstanding young innovators!

关键词： journal accomplishment award

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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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Graphene-based vertical thin film transistors

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Science China(Information Sciences) 2020年第10期63卷 42-53页

作者： Liting LIU Yuan LIU xiangfeng duan Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education School of Physics and ElectronicsHunan University Department of Chemistry and Biochemistry University of California

Vertical field effect transistors(VFETs), where the channel material is sandwiched between source-drain electrodes and the channel length is simply determined by its body thickness, have attracted considerable interest for high performance electronics owning to their intrinsic short channel length. To enable the effective gate modulation and current switching behavior, the electrode of conventional VFET is largely based on perforated metals, in which the gate electrical field could penetrate through. Recently,with the emerge of graphene, a new type of graphene based VFETs has been developed. With finite density of states and the weak electrostatic screening effect, graphene exhibits a field-tunable work-function and partial electrostatic transparency, it can thus function as an "active" contact with tunable graphene-channel junction, enabling entirely new transistor functions or higher device performance not previously *** this review, we discuss the research progresses of graphene-based VFET, including the its basic device structure, carrier transport mechanism, device performance and novel properties demonstrated.

关键词： graphene electrode vertical transistors thin film transistors van der Waals heterostructures

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The Blossoming of 2D Materials

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物理化学学报 2019年第10期35卷 1039-1040页

作者： duan xiangfeng XU Yang Department of Chemistry and Biochemistry UCLA 607 Charles E. Young Drive East Box 951569 Los Angeles CA USA College of Information Science & Electronic Engineering Zhejiang University Hangzhou 310027 P. R. China

The vehement explosion in two-dimensional (2D) materials has led to one exciting new discoveries after another for the past 15 years. This circumstance resembles a famous movie “The Gold Rush”(1925) expressed the true story about the stream of American people as crowded as the hurricane to join the gold racing in the 19th century. Similarly, the family of 2D materials has gained tremendous interest from broad scientific community in various fields, from fundamental chemistry and physics to materials and device engineering. This special issue includes both tutorial reviews and original research articles, providing general overviews of the recent progresses and bringing about the newest discoveries in this rapidly evolving field.

关键词： Blossoming 2D Materials American people

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Van der Waals integration of artificial heterostructures and highorder superlattices

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National Science Open 2023年第1期2卷 52-61页

作者： Qi Qian Zhong Wan xiangfeng duan Department of Chemistry and Biochemistry University of CaliforniaLos Angeles CA 90095USA California NanoSystems Institute University of California Los AngelesLos Angeles CA 90095USA

The recent blossom in 2D atomic crystals(2DACs)has ignited intense interest in a new type of bond-free van der Waals heterostructures(vdWHs),in which distinct material components are physically brought together within a vdW distance and held together by weak vdW *** direct chemical bonding between the constituent materials,the vdWHs negate the lattice matching requirements in typical epitaxially bonded *** we briefly summarize the key advances in the construction and fundamental investigation of versatile vdWHs from diverse 2DACs and beyond,and highlight a unique class of vdW superlattices(vdWSLs)consisting of alternating 2D atomic layers and/or self-assembled molecular layers,with tailored structural symmetry,electronic band modulation,interlayer coupling,and ***,we conclude with a brief outlook on the opportunities in exploring such artificial materials to unlock previously inaccessible physical limits and enable new device concepts beyond the reach of the existing materials.

关键词： van der Waals integration heterostructures high-order superlattices

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Holey graphene hydrogel with in-plane pores for high- performance capacitive desalination

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Nano Research 2016年第8期9卷 2458-2466页

作者： Weiqing Kong Xidong duan Yongjie Ge Hongtao Liu Jiawen Hu xiangfeng duan State Key Laboratory for Chemo/Biosensing and Chemometrics Department of Chemistry and Chemical Engineering Hunan University Changsha 410082 China College of Chemistry and Chemical Engineering Central South University Changsha 410083 China Department of Chemistry and Biochemistry University of Califomia Los Angeles CA 90095 USA

Capacitive deionization is an attractive approach to water desalination and treatment. To achieve efficient capacitative desalination, rationally designed electrodes with high specific capacitances, conductivities, and stabilities are necessary. Here we report the construction of a three-dimensional （3D） holey graphene hydrogel （HGH）. This material contains abundant in-plane pores, offering efficient ion transport pathways. Furthermore, it forms a highly interconnected network of graphene sheets, providing efficient electron transport pathways, and its 3D hierarchical porous structure can provide a large specific surface area for the adsorption and storage of ions. Consequently, HGH serves as a binder-free electrode material with excellent electrical conductivity. Cyclic voltammetry （CV） measurements indicate that the optimized HGH can achieve specific capacitances of 358.4 F.g 1 in 6 M KOH solution and 148 F.g-1 in 0.5 M NaCl solution. Because of these high capacitances, HGH has a desalination capadty as high as 26.8 mg.g-1 （applied potential： 1.2 V; initial NaCI concentration： -5,000 mg.L-l）.

关键词： capacitive deionization desalination electrochemical capacitor graphene hydrogel (GH) in-plane pore

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