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•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%
• Thus, controllable synthesis of HGNs with an engineered hollow cavity, predetermined layer number, small size, and highly crystalline few-layer graphene shells is rarely achieved
hgns的粒径为1030nmssa高达979平米每克孔体积198立方米每克被用在高倍率lis电池中作为基体来容纳shgns正极材料有高的放电容量15201058737mahg分别对应012050c的电流密度在10c的电流密度下初始放电容量1098mahg1000次循环之后放电容量419mahg
文献汇报
；.
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；
；.
4
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
；.
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
；.
12
Morphology and structure of α-Ni(OH)2-DS
；.
13
Morphology and structure of HGNs
；.
14
Morphology and structure of HGNs
；.
15
Electrochemical performance of HGN-S
•S: naturally abundant, economically effective, and environmentally friendly;
•Graphene and other nanostructured carbon materials: excellent conductivity, high specific surface area, accommodate large volume
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
(2D) nanosheets and then assemble into a three-dimensional (3D) mesostructure
；.
10
Results and Discussion
；.
11
The in situ catalytic self-limited assembly of HGNs
；.
16
Morphology of cycled HGN-S electrodes
；.
17
Conclusions
• HGNs通过介尺度催化自限性组装法合成，具有非常小的粒径、单层或多层的 石墨烯片层、3D分层的花瓣状相形态；
• 原位形成的Ni基纳米颗粒既作为硬膜板，又充当催化剂，催化3D纳米结构的 石墨烯在硬膜板上沉积；
；.
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 • Carbon source: dodecyl sulfate(DS) • 3D mesostructure: zero-dimensional (0D) HGNs construct two-dimensional
• HGNs的粒径为10-30nm，SSA高达979平米每克，孔体积1.98立方米每克，被 用在高倍率Li-S电池中作为基体来容纳S；
• HGN-S正极材料有高的放电容量（1520、1058、737mAh/g分别对应0.1、2.0、 5.0C的电流密度）
• 在1.0C的电流密度下，初始放电容量1098mAh/g，1000次循环之后放电容量 419mAh/g；衰减速率平均每圈0.06%，这显著的低于其他无硝酸锂电解液的 基于石墨烯的Li-S电池；
；.
6
Introduction
；.
7
Hollow nanostructures的优势
•Applications： catalysis, adsorption, chemical sensors, drug/gene delivery, and energy
storage/conversion systems •Hollow nanocrystals：
；.
18
Thank you!
；.
19
expansion; •Issues:
Li-S battery: poor cycling life and rate performance 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 calls for new synthetic methodology.
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
；.
2
Source of the article
；.
3
Research background A
•Li-S batteriy: high theoretical energy density of 2600 Wh/kg;
•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%
• Thus, controllable synthesis of HGNs with an engineered hollow cavity, predetermined layer number, small size, and highly crystalline few-layer graphene shells is rarely achieved
hgns的粒径为1030nmssa高达979平米每克孔体积198立方米每克被用在高倍率lis电池中作为基体来容纳shgns正极材料有高的放电容量15201058737mahg分别对应012050c的电流密度在10c的电流密度下初始放电容量1098mahg1000次循环之后放电容量419mahg
文献汇报
；.
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；
；.
4
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
；.
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
；.
12
Morphology and structure of α-Ni(OH)2-DS
；.
13
Morphology and structure of HGNs
；.
14
Morphology and structure of HGNs
；.
15
Electrochemical performance of HGN-S
•S: naturally abundant, economically effective, and environmentally friendly;
•Graphene and other nanostructured carbon materials: excellent conductivity, high specific surface area, accommodate large volume
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
(2D) nanosheets and then assemble into a three-dimensional (3D) mesostructure
；.
10
Results and Discussion
；.
11
The in situ catalytic self-limited assembly of HGNs
；.
16
Morphology of cycled HGN-S electrodes
；.
17
Conclusions
• HGNs通过介尺度催化自限性组装法合成，具有非常小的粒径、单层或多层的 石墨烯片层、3D分层的花瓣状相形态；
• 原位形成的Ni基纳米颗粒既作为硬膜板，又充当催化剂，催化3D纳米结构的 石墨烯在硬膜板上沉积；
；.
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 • Carbon source: dodecyl sulfate(DS) • 3D mesostructure: zero-dimensional (0D) HGNs construct two-dimensional
• HGNs的粒径为10-30nm，SSA高达979平米每克，孔体积1.98立方米每克，被 用在高倍率Li-S电池中作为基体来容纳S；
• HGN-S正极材料有高的放电容量（1520、1058、737mAh/g分别对应0.1、2.0、 5.0C的电流密度）
• 在1.0C的电流密度下，初始放电容量1098mAh/g，1000次循环之后放电容量 419mAh/g；衰减速率平均每圈0.06%，这显著的低于其他无硝酸锂电解液的 基于石墨烯的Li-S电池；
；.
6
Introduction
；.
7
Hollow nanostructures的优势
•Applications： catalysis, adsorption, chemical sensors, drug/gene delivery, and energy
storage/conversion systems •Hollow nanocrystals：
；.
18
Thank you!
；.
19
expansion; •Issues:
Li-S battery: poor cycling life and rate performance 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 calls for new synthetic methodology.
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
；.
2
Source of the article
；.
3
Research background A
•Li-S batteriy: high theoretical energy density of 2600 Wh/kg;