英文文献汇报 ppt课件.ppt

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
目录
Source of the article
Research background A
Li-S batteriy:
high theoretical energy density of 2600 Wh/kg;
S:
naturally abundant, economically effective, and environmentally friendly;
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
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.
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
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()
，70%容量保持
1000次循环，%
Introduction
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
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；
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
Hollow nanostructures新的合成方案
A mesoscale cat