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Engineering of Self-Supported Electrocatalysts on a Three-Dimensional Nickel Foam Platform for Efficient Water Electrolysis

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Transactions of Tianjin University 2024年第2期30卷 103-116页

作者： Ceneng Chen Xian Wang Zijun Huang Jiahui Mo Xiaoyan Zhang Chao Peng Mohamed Khairy Junjie Ge Zhi Long Multiscale Crystal Materials Research Center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China Chemistry Department Faculty of ScienceSohag UniversitySohâg 82524Egypt Dalian National Laboratory for Clean Energy Dalian 116023China

Economical water electrolysis requires highly active non-noble electrocatalysts to overcome the sluggish kinetics of the two half-cell reactions,oxygen evolution reaction,and hydrogen evolution *** intensive efforts have been committed to achieve a hydrogen economy,the expensive noble metal-based catalysts remain under ***,the engineering of self-supported electrocatalysts prepared using a direct growth strategy on three-dimensional(3D)nickel foam(NF)as a conductive substrate has garnered significant *** is due to the large active surface area and 3D porous network offered by these electrocatalysts,which can enhance the synergistic eff ect between the catalyst and the substrate,as well as improve electrocatalytic ***-assisted growth,microwave heating,electrodeposition,and other physical methods(i.e.,chemical vapor deposition and plasma treatment)have been applied to NF to fabricate competitive electrocatalysts with low overpotential and high *** this review,recent advancements in the development of self-supported electrocatalysts on 3D NF are ***,we provide future perspectives of self-supported electrode platforms in electrochemical water splitting.

关键词： Nickel foam Water splitting Surface modification Hydrothermal method Microwave-assisted method Electrodeposition chemical vapor deposition Plasma treatment

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温度对石墨烯褶皱形成影响的理论研究

Science China Materials 2024年第7期67卷 2210-2216页

作者：赵超丁峰 Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen 518055China Faculty of Materials Science and Energy Engineering Shenzhen University of Advanced TechnologyShenzhen 518055China

关于超平整、无褶皱石墨烯的制备的课题目前已引起科学家们的极大关注.理解褶皱形成的机理对于制备超平整、无褶皱石墨烯至关重要.本文通过分子动力学(MD)模拟,研究了单层石墨烯在单层和多层铜衬底上化学气相沉积(CVD)生长过程中的降温... 详细信息

关于超平整、无褶皱石墨烯的制备的课题目前已引起科学家们的极大关注.理解褶皱形成的机理对于制备超平整、无褶皱石墨烯至关重要.本文通过分子动力学(MD)模拟,研究了单层石墨烯在单层和多层铜衬底上化学气相沉积(CVD)生长过程中的降温过程.结果显示,在单层铜衬底上,石墨烯从1300 K冷却到630 K时,初步观察到了褶皱,而在多层铜衬底上,褶皱形成的起始温度约为1080 K.基于这些模拟,我们提出了褶皱形成过程:首先在铜衬底上形成山丘状原子结构,有利于褶皱成核,然后褶皱在这些位置扩展.此外,我们发现褶皱产生的临界温度与石墨烯层和铜衬底之间的粘附力成反比.我们还探讨了摩擦对褶皱密度的影响,并确定了残余压缩应变与相邻两褶皱之间的距离呈近似线性关系.基于石墨烯与Cu(111)衬底之间的摩擦力与外部压缩载荷之间的平衡关系,我们提出了一个理论模型.模拟结果和理论模型均表明,随着摩擦力的增加,相邻两褶皱之间的距离会减小.

关键词： wrinkles graphene molecular dynamics simulation chemical vapor deposition

Modulating the p-band center of carbon nanofibers derived from Co spin state as anode for high-power sodium storage

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Chinese chemical Letters 2024年第1期35卷 537-541页

作者： Zhijia Zhang Yuwen Zhao Yanhao Wei Mengmeng Zhang Chunsheng Li Yan Sun Jianmin Ma Yong Jiang School of Materials Science and Engineering State Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Chemistry and Life Sciences Suzhou University of Science and TechnologySuzhou 215009China Key Laboratory of Advanced Electrode Materials for Novel Solar Cells for Petroleum and chemical Industry of China Suzhou University of Science and TechnologySuzhou 215009China School of Chemistry Tiangong UniversityTianjin 300387China School of Electronic and Information Engineering Institute of Quantum Materials and DevicesTiangong UniversityTianjin 300387China

Carbon nanofibers(CNFs)have received extensive and in-depth studied as anodes for sodium-ion batteries(SIBs),and yet their initial Coulombic efficiency and rate capability remain enormous challenge at practical ***,CNFs anchored with cobalt nanocluster(CNFs-Co)were prepared using chemical vapor deposition and thermal reduction *** as-prepared CNFs-Co shows a high initial Coulombic efficiency of 91%and a high specific discharge capacity of 246 mAh/g at 0.1 A/g after 200 cycles as anode for ***,the CNFs-Co anode still delivers a high cycling stability with 108 mAh/g after 1000 cycles at 10 A/*** excellent electrochemical properties could be attributed to the involved spin state Co,which endows CNFs with large interplanar spacing(0.39 nm)and abundant vacancy ***,the spin state Co downshifts the p-band center of carbon and strengthens the Na+adsorption energy from-2.33 eV to-2.64 eV based on density functional theory *** novel strategy of modulating the carbon electronic structure by the spin state of magnetic metals provides a reference for the development of high-performance carbon-based anode materials.

关键词： Carbon nanofibers chemical vapor deposition Spin state p-band center Sodium-ion battery

Magnesium nickel hydride monocrystalline nanoparticles for reversible hydrogen storage

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Materials Reports(Energy) 2024年第1期4卷 104-112页

作者： Yingyan Zhao Yunfeng Zhu Rui Shi Jiguang Zhang Yana Liu Jun Wang Liquan Li College of Materials Science and Engineering Jiangsu Collaborative Innovation Centre for Advanced Inorganic Function CompositesNanjing Tech University30 South Puzhu RoadNanjing211816PR China

Although Mg-based hydrides are extensively considered as a prospective material for solid-state hydrogen storage and clean energy carriers,their high operating temperature and slow kinetics are the main challenges for practical ***,a Mg-Ni based hydride,Mg_(2)NiH_(4) nanoparticles(~100 nm),with dual modification strategies of nanosizing and alloying is successfully prepared via a gas-solid preparation *** is demonstrated that Mg_(2)NiH_(4) nanoparticles form a unique chain-like structure by oriented stacking and exhibit impressive hydrogen storage performance:it starts to release H2 at~170℃ and completes below 230℃ with a saturated capacity of 3.32 wt%and desorbs 3.14 wt% H_(2) within 1800 s at 200℃.The systematic characterizations of Mg_(2)NiH_(4) nanoparticles at different states reveal the dehydrogenation behavior and demonstrate the excellent structural and hydrogen storage stabilities during the de/hydrogenated *** research is believed to provide new insights for optimizing the kinetic performance of metal hydrides and novel perspectives for designing highly active and stable hydrogen storage alloys.

关键词： Magnesium-based hydride chemical vapor deposition Nanoparticles Hydrogen storage performance

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卷对卷化学气相沉积法制备石墨烯

Science China Materials 2022年第4期65卷 1042-1048页

作者：梁明昊钱凌轩侯雨婷李俊沈长青青芳竹李雪松 State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China School of Electronic Science and Engineering University of Electronic Science and Technology of ChinaChengdu610054China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of ChinaShenzhen518110China

批到批(B2B)和卷到卷(R2R)工艺均可用于石墨烯薄膜的大规模生产.由于设备简单,B2B工艺在实验室研究中非常普遍.相对而言,R2R工艺更容易自动化,并且与随后的转移过程更兼容,因此在工业上更受青睐.目前,对R2R工艺的研究主要集中在反应器... 详细信息

批到批(B2B)和卷到卷(R2R)工艺均可用于石墨烯薄膜的大规模生产.由于设备简单,B2B工艺在实验室研究中非常普遍.相对而言,R2R工艺更容易自动化,并且与随后的转移过程更兼容,因此在工业上更受青睐.目前,对R2R工艺的研究主要集中在反应器设计或装料结构等方面,对石墨烯生长动力学缺乏深入的了解.本文通过研究石墨烯的生长演化过程,发现在相同的反应参数下,R2R工艺的石墨烯晶畴密度大于B2B工艺的石墨烯畴密度,其原因归结于两种工艺不同的反应过程;而通过延长反应时间,可以对石墨烯薄膜的缺陷进行修复.在优化的R2R工艺下,可以获得与常规B2B工艺相当的高质量石墨烯薄膜.本工作可促进石墨烯薄膜制备技术的发展.

关键词： graphene chemical vapor deposition roll to roll kinetics

chemically engineered dendrite growth of uniform monolayers MoS_(2) for enhanced photoluminescence[Invited]

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Chinese Optics Letters 2022年第1期20卷 94-100页

作者：苏欢欢张会珍吴文静王翔王广厚周林 National Laboratory of Solid State Microstructures School of PhysicsCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Department of Electrical Engineering The Pennsylvania State UniversityUniversity ParkPennsylvania 16802USA

Large area and uniform monolayer MoS_(2)is of great importance for optoelectronic devices but is commonly suffering from rather weak ***,by engineering the concentration profiles of gaseous chemicals through extra trace amounts of water,we demonstrate the uniform dendrite-type growth of monolayer MoS_(2)unraveled by spatially resolved fluorescence spectroscopy,which exhibits macroscopic monolayer flakes [up to centimeter scale] with photoluminescence intensity of orders of magnitude higher than conventional chemical vapor deposition monolayer MoS_(2).Both spectroscopic evidence and theoretical models reveal that the fast-fractal dendrite growth can be ascribed to the extra introduced water sources that generate sufficient aqueous gas around the S-poor regions nearby the central-axis zone,leading to highly efficient Mo sources transport,accelerated S atom corrosion nearby grain edges,and/or defect sites,as well as enhanced photoemission *** results may provide new insight for high throughput fabrication of MoS_(2)monolayers with high yield photoluminescence efficiency.

关键词： spectroscopy monolayers MoS_(2) photoluminescence enhancement dendrite chemical vapor deposition

Copper acetate-facilitated transfer-free growth of high-quality graphene for hydrovoltaic generators

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National Science Review 2022年第7期9卷 71-79页

作者： Jingyuan Shan Sunmiao Fang Wendong Wang Wen Zhao Rui Zhang Bingzhi Liu Li Lin Bei Jiang Haina Ci Ruojuan Liu Wen Wang Xiaoqin Yang Wenyue Guo Mark H.Rümmeli Wanlin Guo Jingyu Sun Zhongfan Liu Center for Nanochemistry (CNC) Beijing Science and Engineering Center for Nanocarbons Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Academy for Advanced Interdisciplinary Studies Peking University Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education State Key Laboratory of Mechanics and Control of Mechanical Structures Institute of Nanoscience Nanjing University of Aeronautics and Astronautics Department of Physics and Astronomy University of Manchester School of Materials Science and Engineering China University of Petroleum (East China) College of Energy Soochow Institute for Energy and Materials Innovations (SIEMIS)Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy TechnologiesSoochow University Beijing Graphene Institute (BGI)

Direct synthesis of high-quality graphene on dielectric substrates without a transfer process is of vital importance for a variety of *** strategies for boosting high-quality graphene growth,such as remote metal catalyzation,are limited by poor performance with respect to the release of metal catalysts and hence suffer from a problem with metal ***,we report an effective approach that utilizes a metal-containing species,copper acetate,to continuously supply copper clusters in a gaseous form to aid transfer-free growth of graphene over a wafer *** thus-derived graphene films were found to show reduced multilayer density and improved electrical performance and exhibited a carrier mobility of8500 cm~2 ***,droplet-based hydrovoltaic electricity generator devices based on directly grown graphene were found to exhibit robust voltage output and long cyclic stability,in stark contrast to their counterparts based on transferred graphene,demonstrating the potential for emerging energy harvesting *** work presented here offers a promising solution to organize the metal catalytic booster toward transfer-free synthesis of high-quality graphene and enable smart energy generation.

关键词： chemical vapor deposition graphene copper acetate hydrovoltaic electricity generator transfer-free growth

Nonlinear electronic and ultrafast optical signatures in chemical vapor-deposited ultrathin PtS_(2) ribbons

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Nano Research 2022年第5期15卷 4366-4373页

作者： Shaolong Jiang Jin Yang Liang Zhu Jiafeng Xie Weiteng Guo Erding Zhao Chaoyu Chen Tianwu Wang Fuhai Su Yanfeng Zhang Junhao Lin Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices and Department of Physics Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Great Bay Area Research Institute Aerospace Information Research Institute(AIR)of Chinese Academy of Science(CAS)Guangzhou 510700China Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy and Shenzhen BranchHefei National LaboratoryFutian DistrictShenzhen 518048China School of Materials Science and Engineering Peking UniversityBeijing 100871China

The emerging two-dimensional(2D)platinum disulfide(PtS_(2))has driven increasing attentions due to its high electron mobility,good air-stability,and strong interlayer interaction which leads to a widely tunable electronic ***,a detailed study on its covalent-like layer-dependent properties remains ***,we demonstrate the successful production of ultrathin 1T-PtS_(2) ribbons with thickness centralized almost at monolayer 1L-4L and large domain size up to 210 μm on Au foils using chemical vapor deposition(CVD)technique,which enables macro-and microscopic study of its extraordinary layer-dependent features with precise control of the number of *** electron energy loss spectroscopy(EELS)and optical pump-probe spectroscopy(OPPS),we reveal that both the electron and ultrafast optical absorption signals of the as-grown 2D PtS_(2) show strong nonlinear layer-dependent responses which manifest discriminated transition in 1L-4L PtS_(2) *** layer-dependent nonlinear response of 2D PtS_(2) can be well interpreted in the frame of calculated electron and phonon *** achievements offer a platform for successfully fabricating large-sized ultrathin 2D PtS_(2) and facilitating our knowledge about its electronic and optoelectronic properties.

关键词： platinum disulfide(PtS_(2)) chemical vapor deposition electronic transition saturable absorption optical pump-probe spectroscopy

Discovery of the largest natural carbon onions on Earth

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Science China Earth Sciences 2022年第9期65卷 1736-1750页

作者： Yilin CHEN Yong QIN Jiuqing LI Zhuangfu LI Tianyu YANG Ergang LIAN Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education China University of Mining and TechnologyXuzhou 221008China School of Resources and Geosciences China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

The synthesis of carbon onions in the laboratory by various methods is common;however, naturally occurring carbon onions have only been found in a few geological samples on Earth. This study used high-resolution transmission electron microscopy to identify natural carbon onions in seven intrusion-affected coal samples collected from Permian coal-bearing strata in the Yongan Coalfield, Fujian Province, South China. This study identified the largest natural carbon onions ever recorded on Earth;their outer diameter was ~55 nm. Granite porphyry intrusions and quartz hydrothermal veins are abundant in the Permian coal-bearing strata in this coalfield. All samples collected were tectonically deformed coals with highly developed structural fractures, friction mirror planes, and maximum vitrinite reflectance values of 4.0–9.5%. Natural carbon onions observed in the coal samples had single or multiple cores, with 24–46 graphitic shells characterized by outer diameters of 24–55 nm. The maximum vitrinite reflectance, outer diameter, and graphitic shell number of carbon onions in the intrusion-affected coal were positively correlated, indicating that the carbon onions were secondary products formed during coal metamorphism owing to magmatic intrusion. Our results suggest that carbon onions in intrusion-affected coal are synthesized by chemical vapor deposition. We speculate that natural carbon onions exist mainly in fractures or cavities, similar to vapor-deposited pyrolytic carbon, which is the leading cause of the uneven distribution of carbon onions in intrusion-affected coals in the study area.

关键词： Onion-like fullerenes Intrusion-affected coal chemical vapor deposition HRTEM Coal metamorphism