石墨烯材料PPT课件

1、石墨烯材料 石墨烯（GR）是一种从石墨材料中剥离出的单层碳原子面材料，是碳的二维结构。石墨烯是继纳米碳管、富勒烯球后的又一重大发现。这种石墨晶体薄膜的厚度只有0.3350.335纳米。 特性：机械强度，热稳定性，导电性 制备: 1.加热SiC的方法 2.轻微摩擦法或撕胶带法 3.化学分散法 第1页/共18页石墨烯在电容器电极材料中研究现状1.1. 制备方法的研究与改进2.2. 复合材料的探究： 1 1）与碳材料复合 2 2）与金属氧化物或水合金氧化物复合 3 3）与导电聚合物复合第2页/共18页相关文献复合材料报导(For SC)碳材料：GR/CNTs GR/MWNTs GR/CNFs 金氧化

2、物：GR/MnO2 GR/SnO2 GR/ZnO GR/RuO2 GR/Mn3O4 GR/Fe3O4 GR/Co3O4 GR/Ni(OH)2 GR/Co(OH)2 GR/KOH GR/BiOx导电聚合物：GR/ PAn GR/PPy其它: Au, Pt 插层GR GR/Sn3S4 第3页/共18页文献简述1Graphene nanosheets for enhanced lithium storage in lithium ion batteriesGuoxiu Wang*, Xiaoping Shen, Jane Yao, Jinsoo ParkAustraliaCARBON 47 (200

3、9) 2049 2053第4页/共18页简述 制备：电化学方法-氧化，超声剥落，水合肼 还原 表征与测试：XRD TEM UV-Vis 充放电曲线 稳定性测试 结论： Graphene nanosheet anodes exhibited an enhanced reversible lithium storage capacity as anode in lithium-ion cells and good cyclic performance.第5页/共18页Fig. 1 (a) Low magnification FEG-SEM image of loosegraphene nanosh

4、eet powders. (b) High magnification FEG-SEM view of graphene nanosheet petals.第6页/共18页Fig. 2 (a) Low magnification TEM image of giant graphene nanosheets, resembling wavy silk under the TEM beam. (b) High magnification TEM image of the basal plane of graphene nanosheets. (c) HRTEM image of stacked g

5、raphene nanosheets, in which the lattice planes correspond to (002) planes with an interlayer distance of 0.37 nm. The inset is the SAED pattern recorded on the basal plane of graphene nanosheet.第7页/共18页第8页/共18页文献简述2Mn3O4 nanoparticles embedded into graphene nanosheets: Preparation,characterization,

6、 and electrochemical properties for supercapacitorsBeiWanga,b, Jinsoo Parkc, ChengyinWangb, Hyojun Ahnc, GuoxiuWanga,b （Australia）Electrochimica Acta 55 (2010) 68126817第9页/共18页材料制备及分析 化学分散法合成GR氧化物，水合肼还原,制得悬浮液。 制得MnO2有机凝胶10ml+上述悬浮液35ml 经过超声煅烧制得样品。 形貌测试：XRD, FESEM, TEM , AFM 电化学性能测试：CV第10页/共18页Fig. 1.

7、 X-ray diffraction patterns: (a) vacuum dried graphene nanosheets and (b)Mn3O4/graphene nanocomposites showing the diffraction lines of Hausmannite Mn3O4 and graphene nanosheets (GNS).第11页/共18页Fig. 2. FESEM images of the as-prepared Mn3O4/graphene nanocomposites: (a)lowmagnification image, showing t

8、he generalmorphology of graphene nanosheets with embedded Mn3O4 nanoparticles and (b) highmagnification image, illustrating Mn3O4 nanoparticles on graphene nanosheets.第12页/共18页Fig. 3. TEM images of the as-prepared Mn3O4/graphene nanocomposites: (a) a low magnification TEMimage showing dense Mn3O4 na

9、noparticles deposited on a large area of graphene nanosheets and the SAED pattern (inset) displaying graphene (002) and Mn3O4 (103), (211), and (220) diffraction rings; (b) an HRTEM image illustrating the d-spacing of Mn3O4 nanoparticles, which were evaluated to be around 10 nm in size.第13页/共18页 Fig

10、. 4. AFM images of the as-prepared Mn3O4/graphene nanocomposites: (left) an image taken in a scan area of 500 nm500 nm, displaying graphene nanosheets (indicated by arrows) with embedded Mn3O4 nanoparticles (indicated by circles); (right) height profile across the examined area, as indicated by the

11、red line, from which the particle size was determined to be 9.7 nm and 12.6 nm for particles (a) and (b), respectively.第14页/共18页Fig. 5. CV curves of dried graphene nanosheets at a 5mVs1 scan rate in (a) 1 M Na2SO4 and (b) 6 M KOH, and CV curves of Mn3O4/graphene nanocomposite powders at scan rates of 5 mVs1,10 mVs1,20mVs1, and 50mVs1 in (c) 1 M Na2SO4 and (d) 6 M KOH.第15页/共18页结论 The as-prepared materials exhibited an outstanding electrochemical property as supercapacitor. A high spec