英文文献汇报(课堂PPT)
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• Thus, controllable synthesis of HGNs with an engineered hollow cavity, predetermined layer number, small size, and highly crystalline fewlayer graphene shells is rarely achieved
2020/4/3
10
Results and Discussion
The in situ catalytic self-limited assembly of HGNs Morphology and structure of α-Ni(OH)2-DS Morphology and structure of HGNs Electrochemical performance of HGN-S
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;
合材料，作为电池正极
2020/4/3
5
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: 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
Hollow nanostructures新的合成方案
2020/4/3
7
Hollow nanostructures的优势
• Applications： catalysis, adsorption, chemical sensors, drug/gene delivery,
and energy storage/conversion systems • Hollow nanocrystals：
mesoscale hollow structure, nanoscale quantum effects, and atomic-scale periodic arrangement • Hollow graphene nanoshells(HGNs)：
favourable electrical conductivity, good surface functionality, mechanical/chemical stability, and biocompatibility
• Carbon source: dodecyl sulfate(DS)
• 3D mesostructure: zero-dimensional (0D) HGNs construct two-dimensional (2D) nanosheets and then assemble into a threedimensional (3D) mesostructure
• Graphene and other nanostructured carbon materials:
excellent conductivity, high specific surface area, accommodate large volume expansion;
• Issues:
Li-S battery: poor cycling life and rate performance
2020/4/3
9
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
S: large volumetric expansion，poor conductivity
Graphene: couldn’t integrate all the structural benefits.
• The concept of HGNs might be a promising strategy, which yet
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
calls for new synthetic methodology.
2020/4/3
4
Байду номын сангаас
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
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
6
Introduction
Hollow nanostructures的优势 Hollow nanostructures的合成困境
2020/4/3
8
Hollow nanostructures的合成困境
• 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；
2020/4/3
10
Results and Discussion
The in situ catalytic self-limited assembly of HGNs Morphology and structure of α-Ni(OH)2-DS Morphology and structure of HGNs Electrochemical performance of HGN-S
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;
合材料，作为电池正极
2020/4/3
5
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: 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
Hollow nanostructures新的合成方案
2020/4/3
7
Hollow nanostructures的优势
• Applications： catalysis, adsorption, chemical sensors, drug/gene delivery,
and energy storage/conversion systems • Hollow nanocrystals：
mesoscale hollow structure, nanoscale quantum effects, and atomic-scale periodic arrangement • Hollow graphene nanoshells(HGNs)：
favourable electrical conductivity, good surface functionality, mechanical/chemical stability, and biocompatibility
• Carbon source: dodecyl sulfate(DS)
• 3D mesostructure: zero-dimensional (0D) HGNs construct two-dimensional (2D) nanosheets and then assemble into a threedimensional (3D) mesostructure
• Graphene and other nanostructured carbon materials:
excellent conductivity, high specific surface area, accommodate large volume expansion;
• Issues:
Li-S battery: poor cycling life and rate performance
2020/4/3
9
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
S: large volumetric expansion，poor conductivity
Graphene: couldn’t integrate all the structural benefits.
• The concept of HGNs might be a promising strategy, which yet
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
calls for new synthetic methodology.
2020/4/3
4
Байду номын сангаас
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
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
6
Introduction
Hollow nanostructures的优势 Hollow nanostructures的合成困境
2020/4/3
8
Hollow nanostructures的合成困境
• 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；