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48 results on '"Peng, Jingsong"'

5. Enabling Stable Zn Anode with PVDF/CNTs Nanocomposites Protective Layer Toward High‐Performance Aqueous Zinc‐Ion Batteries.

Author

Wang, Jinchang, Peng, Jingsong, Huang, Weifeng, Liang, Hanqin, Hao, Yida, Li, Jiefei, Chu, Haibin, Wei, Hang, Zhang, Yuanyuan, and Liu, Jian

Subjects
*ZINC ions, *ANODES, *METAL coating, *DENDRITIC crystals, *POLYVINYLIDENE fluoride, *COMPUTED tomography
Abstract

Due to its abundance of natural resources, high theoretical capacity, and suitable redox potential (−0.76 V vs SHE), Zn anode has received extensive attention both from academy and industry. However, the coexistence of Zn and H2O, which is unfortunately thermodynamically unstable, always involves severe metal corrosion, H2 evolution, dendrite growth, resulting in low reversibility of Zn anode. Herein, a phase transfer method is adapted to design a porous conductive protective layer on the Zn anode, denoted as (PVDF (Polyvinylidene fluoride)/CNTs(Carbon Nanotubes)‐PT(phase transfer) @ Zn). Based on in situ characterization, COMSOL simulation, and migration energy barrier calculation, it can be demonstrated that PVDF/CNTs‐PT @ Zn effectively inhibited the production of Zn dendrites and the side reactions triggered by H2O, achieving uniform deposition. Especially, the full picture of Zn deposition is observed using in situ computed tomography (CT). The symmetrical cell using the PVDF/CNTs‐PT @ Zn demonstrates dendrite‐free plating/stripping and possesses much better cycle stability than the bare Zn. A stable rechargeable full battery is demoed through coupling the PVDF/CNTs‐PT @ Zn anode with commercial V2O5. The strategy showcases a feasible pathway to inhibit Zn dendrite and side reactions in aqueous Zn ion battery, opening a promising avenue for the construction of metal anode protection layer. [ABSTRACT FROM AUTHOR]

Published
2024
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18. Tough and Conductive Nacre‐inspired MXene/Epoxy Layered Bulk Nanocomposites.

Author

Wang, Huagao, Lu, Rongjian, Yan, Jia, Peng, Jingsong, Tomsia, Antoni P., Liang, Rui, Sun, Guoxing, Liu, Mingjie, Jiang, Lei, and Cheng, Qunfeng

Subjects
NANOCOMPOSITE materials, MATERIALS science, ELECTRIC conductivity, ELECTROMAGNETIC interference, ELECTROMAGNETIC shielding, EPOXY resins
Abstract

A long‐standing quest in materials science has been the development of tough epoxy resin nanocomposites for use in numerous applications. Inspired by nacre, here we report tough and conductive MXene/epoxy layered bulk nanocomposites. The orientation of MXene lamellar scaffolds is enhanced by annealing treatment. The improved interfacial interactions between MXene lamellar scaffold and epoxy through surface chemical modification resulted in a synergistic effect. Tailoring the interlayer spacing of MXene nanosheets to a critical distance resulted in a fracture toughness about eight times higher than that of pure epoxy, surpassing other epoxy nanocomposites. Our nacre‐inspired MXene/epoxy layered bulk nanocomposites also show high electrical conductivity that provides self‐monitoring capability for structural integrity and exhibits an excellent electromagnetic interference shielding efficiency. Our proposed strategy provides an avenue for fabricating high‐performance epoxy nanocomposites. [ABSTRACT FROM AUTHOR]

Published
2023
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22. Inverse Nacre-like Epoxy-Graphene Layered Nanocomposites with Integration of High Toughness and Self-Monitoring

Author

Peng, Jingsong, Huang, Chuanjin, Cao, Can, Saiz, Eduardo, Du, Yi, Dou, Shi Xue, Tomsia, Antoni, Wagner, Hanoch, Jiang, Lei, Cheng, Qunfeng, Peng, Jingsong, Huang, Chuanjin, Cao, Can, Saiz, Eduardo, Du, Yi, Dou, Shi Xue, Tomsia, Antoni, Wagner, Hanoch, Jiang, Lei, and Cheng, Qunfeng

Abstract

2019 Elsevier Inc. Epoxy nanocomposites are widely used materials in engineering applications from automobiles to aircraft. However, their low fracture toughness significantly hinders their usefulness due to the possible catastrophic failure caused by the small cracks or defects. Herein, we demonstrate that inverse nacre-like epoxy-graphene layered nanocomposites with high toughness can be fabricated using the freeze-casting technique, which has promise to solve the problem of poor crack resistance for traditional epoxy-graphene nanocomposites. In addition, the continuous graphene-based scaffold in the epoxy matrix endows this epoxy-graphene nanocomposite with electrical conductivity and confers on it a self-monitoring function. The propagating cracks can be detected by the variable electrical resistance, thus making future nanocomposites safe and more secure.

Published
2020

25. Ultratough nacre-inspired epoxy-graphene composites with shape memory properties

Author

Huang, Chuanjin, Peng, Jingsong, Cheng, Yiren, Zhao, Qian, Du, Yi, Dou, Shi Xue, Tomsia, Antoni, Wagner, Hanoch, Jiang, Lei, Cheng, Qunfeng, Huang, Chuanjin, Peng, Jingsong, Cheng, Yiren, Zhao, Qian, Du, Yi, Dou, Shi Xue, Tomsia, Antoni, Wagner, Hanoch, Jiang, Lei, and Cheng, Qunfeng

Abstract

Shape memory polymers are widely used in industrial applications. Despite extensive and continuous research studies, it is still a great challenge to improve the mechanical properties without affecting their shape memory properties. One approach to improving them is to seek inspiration from natural materials that exhibit superior performance and provide an infinite source of design guidelines. Inspired by the hierarchical architecture of nacre, we have prepared nacre-like shape memory epoxy-graphene composites via freeze-casting, a technique to create lamellar materials with complex hierarchical microstructures. Perpendicular to the lamellar direction, the fracture toughness of our composites is ∼2.5 times that of the epoxy matrix, due to the synergy of extrinsic toughening mechanisms combining crack deflection, crack branching, crack bridging, and friction between the layered platelets. We achieved high damage-tolerance in our composites by having some degree of plasticity to relax stresses in an epoxy layer. The shape memory properties can be activated using external heating. Due to the electrical conductivity of graphene, we have also achieved electro-active shape memory composites. Our approach suggests an avenue for producing bioinspired shape memory composites with good mechanical and multi-functional properties by utilizing the design principles and strengthening/toughening mechanisms active in nacre and other biological materials.

Published
2019

26. Ultra-Tough Inverse Artificial Nacre Based on Epoxy-Graphene by Freeze-Casting

Author

Huang, Chuanjin, Peng, Jingsong, Wan, Sijie, Du, Yi, Dou, Shi Xue, Wagner, Hanoch Daniel, Tomsia, Antoni P, Jiang, Lei, Cheng, Qunfeng, Huang, Chuanjin, Peng, Jingsong, Wan, Sijie, Du, Yi, Dou, Shi Xue, Wagner, Hanoch Daniel, Tomsia, Antoni P, Jiang, Lei, and Cheng, Qunfeng

Abstract

Epoxy nanocomposites combining high toughness with advantageous functional properties are needed in many fields. However, fabricating high-performance homogeneous epoxy nanocomposites with traditional methods remains a great challenge. Nacre with outstanding fracture toughness presents an ideal blueprint for the development of future epoxy nanocomposites. Now, high-performance epoxy-graphene layered nanocomposites were demonstrated with ultrahigh toughness and temperature-sensing properties. These nanocomposites are composed of ca. 99 wt % organic epoxy, which is in contrast to the composition of natural nacre (ca. 96 wt % inorganic aragonite). These nanocomposites are named an inverse artificial nacre. The fracture toughness reaches about 4.2 times higher than that of pure epoxy. The electrical resistance is temperature-sensitive and stable under various humidity conditions. This strategy opens an avenue for fabricating high-performance epoxy nanocomposites with functional properties.

Published
2019

44. Ultratough Bioinspired Graphene Fiber viaSequential Toughening of Hydrogen and Ionic Bonding

Author

Wang, Xiaohui, Peng, Jingsong, Zhang, Yuanyuan, Li, Mingzhu, Saiz, Eduardo, Tomsia, Antoni P., and Cheng, Qunfeng

Abstract

Graphene-based fibers synthesized under ambient temperature have not achieved excellent mechanical properties of high toughness or tensile strength compared with those synthesized by hydrothermal strategy or graphitization and annealing treatment. Inspired by the relationship between organic/inorganic hierarchical structure, interfacial interactions, and moderate growth temperature of natural nacre, we fabricate an ultratough graphene fiber viasequential toughening of hydrogen and ionic bonding through a wet-spinning method under ambient temperature. A slight amount of chitosan is introduced to form hydrogen bonding with graphene oxide nanosheets, and the ionic bonding is formed between graphene oxide nanosheets and divalent calcium ions. The optimized sequential toughening of hydrogen and ionic bonding results in an ultratough graphene fiber with toughness of 26.3 MJ/m3and ultimate tensile strength of 743.6 MPa. Meanwhile, the electrical conductivity of the resultant graphene fiber is as high as 179.0 S/cm. This kind of multifunctional graphene fiber shows promising applications in photovoltaic wires, flexible supercapacitor electrodes, wearable electronic textiles, fiber motors, etc. Furthermore, the strategy of sequential toughening of hydrogen and ionic bonding interactions also offers an avenue for constructing high-performance graphene-based fibers in the near future.

Published
2018
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48. Ultra-Tough Inverse Artificial Nacre Based on Epoxy-Graphene by Freeze-Casting.

Author

Huang C, Peng J, Wan S, Du Y, Dou S, Wagner HD, Tomsia AP, Jiang L, and Cheng Q

Abstract

Epoxy nanocomposites combining high toughness with advantageous functional properties are needed in many fields. However, fabricating high-performance homogeneous epoxy nanocomposites with traditional methods remains a great challenge. Nacre with outstanding fracture toughness presents an ideal blueprint for the development of future epoxy nanocomposites. Now, high-performance epoxy-graphene layered nanocomposites were demonstrated with ultrahigh toughness and temperature-sensing properties. These nanocomposites are composed of ca. 99 wt % organic epoxy, which is in contrast to the composition of natural nacre (ca. 96 wt % inorganic aragonite). These nanocomposites are named an inverse artificial nacre. The fracture toughness reaches about 4.2 times higher than that of pure epoxy. The electrical resistance is temperature-sensitive and stable under various humidity conditions. This strategy opens an avenue for fabricating high-performance epoxy nanocomposites with functional properties., (© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2019
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