英文文献汇报课堂

6
Introduction
Hollow nanostructures 的优势
Hollow nanostructures 的合成困境
Hollow nanostructures 新的合成方案
2020/4/3
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Hollow nanostructures 的优势
? Applications： catalysis, adsorption, chemical sensors, drug/gene delivery,
? The template-free or self-templating bottom-up approaches：hardly extended to HGN synthesis；
? A template-involving top-down strategy：no catalytic capability to regularly manage the arrangement of carbon atoms；
favourable electrical conductivity, good surface functionality, mechanical/chemical stability, and biocompatibility
2020/4/3
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Hollow nanostructures 的合成困境
:Leabharlann Baidu
催化剂作用下，在原位形成的纳米颗粒上实现纳米石墨烯的自 限性组装
? Use:
石墨烯纳米球壳作为基体与 S复合，用作锂硫电池正极材料
? Properties :
初始放电容量： 1520mAh/g(0.1C)
电流密度从 0.1C提升至2.0C，70%容量保持
1000次循环，每次衰减 0.06%
2020/4/3
2020/4/3
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Results and Discussion
? Carbon source: dodecyl sulfate(DS)
? 3D mesostructure: zero-dimensional (0D) HGNs construct two-dimensional (2D) nanosheets and then assemble into a threedimensional (3D) mesostructure
Li-S battery: poor cycling life and rate performance
S: large volumetric expansion ，poor conductivity
Graphene: couldn't integrate all the structural benefits.
文献汇报
硬膜板上催化作用下的自限性组装： 用在锂硫电池中的中尺度石墨烯纳米壳
汇报人：XXX
1
目录
Source of the article Research background Abstract Introduction Results and Discussion
Conclusions
2020/4/3
and energy storage/conversion systems ? Hollow nanocrystals：
mesoscale hollow structure, nanoscale quantum effects, and atomic-scale periodic arrangement ? Hollow graphene nanoshells(HGNs)：
2020/4/3
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Hollow nanostructures 新的合成方案
? A mesoscale catalytic self-limited assembly of hollow graphene spheres was proposed.
? Hard templates and working catalysts: in situ formed nickel-based NPs
? Graphene and other nanostructured carbon materials :
excellent conductivity, high specific surface area, accommodate large volume expansion;
? Issues:
2
Source of the article
2020/4/3
3
Research background A
? Li-S batteriy:
high theoretical energy density of 2600 Wh/kg;
? S:
naturally abundant, economically effective, and environmentally friendly;
? The concept of HGNs might be a promising strategy, which yet
calls for new synthetic methodology.
2020/4/3
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Research background B
? 研究背景： 中空纳米结构对提升电池性能有巨大优势，
但传统方法难以制作
? 研究目的： 提升锂硫电池容量；提高电池稳定性
? 解决方案： 中空石墨烯纳米球壳结构，嵌入硫合成复
合材料，作为电池正极
2020/4/3
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Abstract
? Hollow nanostructures ：
表面积大；活性部位充分暴露；物质输运的动力学性能优良； 表面通透性好
? A mesoscale approach to fabricate graphene shells
? Thus, controllable synthesis of HGNs with an engineered hollow cavity, predetermined layer number, small size, and highly crystalline fewlayer graphene shells is rarely achieved