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Bimetallic zeolitic imidazolate framework-derived substrate-free anode with superior cyclability for high-capacity lithium-ion batteries

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Journal of Materials Science & Technology 2021年第8期67卷 116-126页

作者： bhavana joshi Edmund Samuel Yong-il Kim Govindasami Periyasami Mostafizur Rahaman Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul136-713Republic of Korea Department of Physics NES Science CollegeSwami Ramanand Teerth Marathwada UniversityLatur RoadNandedMaharashtra431606India Department of Chemistry College of ScienceKing Saud UniversityRiyadh11451Saudi Arabia

Freestanding carbon nanofibers loaded with bimetallic hollow nanocage structures were *** nanocages inherited the rhombic dodecahedral morphology of the zeolitic imidazolate framework(ZIF)precursors,ZIF-8 and *** anode materials for lithium-ion batteries(LIBs),the bimetallic nanocage-loaded freestanding carbon nanofibers effectively buffered volume expansions and alleviated pulverization through their different reduction and oxidation *** higher capacities of the composite anodes arose via the formation of the Li_(x)Zn alloy and Li_(2)O by Zn and Co ions,respectively,and the enhanced conductivity conferred by the carbon nanofibers.A synergistic effect of the composite components toward the strong electrochemical performance(688 m A h·g^(-1)at 1200 m A·g^(-1))of the bimetallic nanocage-loaded fibers was demonstrated through the superior long-term stability of the anode(1048 m A h·g^(-1)after 300 cycles at 100 m A·g^(-1)),suggesting that the fabricated anode can be a promising material for use in portable LIBs.

关键词： Carbon nanofiber Nanostructure Composite anode Zeolitic imidazolate framework

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Wearable heater composites comprising traditional Hanji cellulose fibers coated with graphene,silver nanowires,and PEDOT:PSS via scalable supersonic spraying

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Journal of Materials Science & Technology 2023年第33期164卷 27-36页

作者： Woojin Lim Ashwin Khadka Byeong-Yeop Kim Chanwoo Park Ali Aldalbahi Govindasami Periyasami bhavana joshi Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul 136-713Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

Traditional Korean Hanji paper and cotton fabric were introduced as flexible substrates in the fabrication of graphene-coated *** nanowires and PEDOT:PSS were added to increase the electrical conductivity of the heaters,thereby enhancing their heating *** optimal concentrations of silver nanowires and PEDOT:PSS with respect to that of graphene were *** active materials were deposited on flexible Hanji/cotton and non-flexible alumina substrates using supersonic *** proposed Hanji-and cotton-based heaters were light,wearable,stretchable,skin-friendly,and *** unyielding alumina-based heater exhibited the highest heating temperature of 275°C at 13 *** heater bendability and stretchability were tested considering multiple bending and stretching ***,water boiling and fabric drying were successfully performed using the alumina-based *** supersonic spraying deposition technique was used to produce writable and patternable heaters.

关键词： Graphene Silver nanowires PEDOT:PSS Supersonic spraying Hanji Wearable heater

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Beta-phase transformation of polyvinylidene fluoride with supersonically sprayed ZnSnO_(3) cuboids for flexible piezoelectric nanogenerators

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Journal of Materials Science & Technology 2024年第10期177卷 103-113页

作者： bhavana joshi Taegun Kim Woojin Lim Edmund Samue Chanwoo Park Ali Aldalbahi Mohamed El-Newehy Hae-Seok Lee Seongpil An Sam S.Yoon School of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea Core Component Technology Team Samsung Electronics Co Ltd.Mobile R&D CenterSamsung-roSuwon-siGyeonggi-doRepublic of Korea Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversitySeoul 02841Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia SKKU Advanced Institute of Nanotechnology(SAINT) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Nano Science and Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Flexible self-powered electromechanical devices,such as piezoelectric nanogenerators(PENGs),which are used in wearable and implantable devices,are emerging as state-of-the-art clean energy *** this study,a scalable supersonic spraying technique was used to prepare flexible piezocomposite films of polyvinylidene fluoride(PVDF)and hydrothermally synthesized ZnSnO_(3)(ZSO)cubes for *** spectra confirmed that the transformation of the α-phase of PVDF to its β-phase was induced by the shear stress generated between the ZSO particles and PVDF polymer during supersonic *** op-timized sample comprising 0.43 g of ZSO cubes and 1 g of PVDF produced a maximum piezopotential of 41.5 V and a short-circuit current,I_(sc),of 52.5 μA.A maximum power density of 50.6 μW cm-2 was ob-tained at a loading resistance of 0.4 MΩ,which matched the impedance of the ***-term tapping and bending cycles of N_(tap)=4200 and N_(bend)=600 yielded piezopotentials of 40.5 and 1.7 V,*** addition,electrical poling for 2 h increased the piezopotential to 52 V owing to the alignment of the ferroelectric dipoles in the PVDF.

关键词： ZnSnO_(3) PVDF Composite Perovskite Supersonic cold spray Piezoelectric nanogenerator

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