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Chemical interaction motivated structure design of layered metal carbonate hydroxide/MXene composites for fast and durable lithium ion storage

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Journal of Energy Chemistry 2021年第12期30卷 633-641,I0015页

作者： Huibin Guan Hanna He Tianbiao Zeng Chuhong Zhang State Key Laboratory of Polymer Materials Engineering Polymer Research InstituteSichuan UniversityChengdu 610065Sichuan.China

Rational architecture design has turned out to be an effective strategy in improving the electrochemical performance of electrode materials for ***,an elaborate structure that could simultaneously endow active materials with promoted reaction reversibility,accelerated kinetic and restricted volume change still remains a huge ***,a novel chemical interaction motivated structure design strategy has been proposed,and a chemically bonded Co(CO_(3))_(0.5)OH·0.11 H_(2)O@MXene(CoCH@MXene)layered-composite was fabricated for the first *** such a composite,the chemical interaction between Co^(2+)and MXene drives the growth of smaller-sized CoCH crystals and the subsequent formation of interwoven CoCH wires sandwiched in-between MXene *** unique layered structure not only encourages charge transfer for faster reaction dynamics,but buffers the volume change of CoCH during lithiation-delithiation process,owing to the confined crystal growth between conductive MXene layers with the help of chemical ***,the sandwiched interwoven CoCH wires also prevent the stacking of MXene layers,further conducive to the electrochemical performance of the *** a result,the as-prepared CoCH@MXene anode demonstrates a high reversible capacity(903.1 mAh g^(-1)at 100 mA g^(-1))and excellent cycling stability(maintains 733.6 mAh g^(-1)at1000 mA g^(-1)after 500 cycles)for lithium ion *** work highlights a novel concept of layerby-layer chemical interaction motivated architecture design for futuristic high performance electrode materials in energy storage systems.

关键词： Chemical interaction motivated structure design layer-by-layer structure Metal carbonate hydroxide Few-layer MXene Fast and durable lithium ion storage

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Preparation of chitosan rods with excellent mechanical properties: One candidate for bone fracture internal fixation

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Science China Chemistry 2011年第2期54卷 380-384页

作者： WANG ZhengKe HU QiaoLing WANG YouXiang Key Laboratory of Macromolecule Synthesis and Functionalization Ministry of EducationZhejiang UniversityHangzhou 310027China Institute of Biomedical Macromolecules Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Chitosan (CS) is one promising material as a temporary mechanical supporter for bone fracture internal *** our previous work,we successfully fabricated CS rods through one in situ precipitation *** bending strength and bending modulus of CS rods need to be improved to match the commercially available devices used for bone fracture internal *** this research,CS rods were reinforced effectively through cross-linking reaction by using glutaraldehyde as the coupling ***’s base was detected by FTIR due to the chemical reaction between amino groups and aldehyde *** plane space of CS rods became small during the formation of network *** was observed by SEM,indicating that layer-by-layer structure became much tighter after cross-linking reaction,and cracks in one layer turned around when they reached another layer to absorb *** strength and bending modulus of cross-linked CS rods could reach 186.3 MPa and 5.17 GPa,*** with uncross-linked CS rods,they are increased by 101.6% and 26.1%,*** a result,mechanical properties of CS rods are equivalent to the commercially available biodegradable *** rods with excellent mechanical properties are a good candidate for bone fracture internal fixation.

关键词： chitosan glutaraldehyde layer-by-layer structure reinforcement biomedical material

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基于分层结构的三元高效有机太阳能电池的研究

基于分层结构的三元高效有机太阳能电池的研究

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作者：朱若碧电子科技大学

学位级别：硕士

In recent years,Organic solar cells(OSCs)have been widely discussed as potential clean energy conversion *** this stage,bulk heterojunction(BHJ)structure is the mainstream device structure for the preparation of OSCs,and its combination with ternary strategy is a common OSCs efficiency optimization ***,BHJ OSCs have problems such as difficulty in morphological adjustment,and the addition of the third components will lead to more complex morphological *** view of this difficulty,this paper combines the ternary strategy with the layer-by-layer(Lb L)method to improve the efficiency of *** main research work is as follows:(1)The highly crystalline small molecule donor BTR-Cl was introduced into the main system with D18-Cl as the donor and Y6 as the *** and ternary OSCs based on BHJ structure and Lb L structure were prepared and *** the morphological point of view,it is proved that Lb L OSCs have a better vertical morphology conducive to charge extraction and have phase separation of the same magnitude as the exciton diffusion *** analysis from a morphological point of view,it is proved that Lb L OSCs have a better vertical morphology and possess phase separation of the same magnitude as the exciton diffusion distance,which conducive to charge *** characterization of the crystallinity of different systems,it was found that the addition of BTR-Cl made the molecules more closely arranged,and improved the crystalline domain of the film,especially in the Lb L structure,indicating that the vertical distribution structure formed can better promote the crystallinity of BTRCl regulated *** morphology allows the ternary Lb L OSCs to obtain the best charge permeation channel and improve the charge mobility,while reducing the chance of charge burst due to recombination before being successfully extracted to the ***,17.92% efficiency of ternary Lb L OSCs was achieved in this syste

关键词： Organic Solar Cells layer-by-layer structure Ternary Strategy Morphology Regulation Alloy Model

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