二氧化锰/石墨烯量子点的超薄“三明治”结构构筑与超电容性能研究

项目名称： 二氧化锰/石墨烯量子点的超薄“三明治”结构构筑与超电容性能研究

项目编号： No.21506029

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 有机化学

项目作者： 庞洪昌

作者单位： 大连理工大学

项目金额： 21万元

中文摘要： 超薄二氧化锰纳米材料在电催化、储能、光电等方面作为电极材料显示出了巨大潜力。然而超薄二氧化锰存在平面内电荷/电子扩散传递能力差的瓶颈。二氧化锰与石墨烯复合虽能提高导电性，但复合物功率密度相对不高且石墨烯超高比表面积利用率较低等问题突出。本项目提出在石墨烯量子点（GQD）导电“夹心”两侧均匀生长超薄二氧化锰晶层构筑“三明治”结构复合物的思路，旨在高效利用超薄二氧化锰的高功率密度和石墨烯结构的导电性、超高比表面积。具体以高锰酸钾在石墨烯量子点两侧表面原位均匀还原沉积构筑的MnO2/GQD超薄“三明治”结构复合物为研究对象，开展石墨烯量子点尺寸、表面基团功能化对产物结构影响规律与控制机理研究；探索二氧化锰在量子点表面原位沉积与生长控制规律；揭示产物超薄“三明治”结构与超电容性能的相关性规律；其研究结果对实现其他超薄过渡金属氧化物平面内良好导电及提高石墨烯超高比表面积利用效率具有指导意义。

中文关键词： 二氧化锰；石墨烯量子点；超薄三明治结构；导电性；超电容性能

英文摘要： Ultrathin manganese dioxide (MnO2) has attracted much attention due to its unique functions and extensive applications in electrocatalysis, photoelectricity, energy storage and so on. However, fast charge/electron transfer in the plane of ultrathin MnO2 nanosheet and its effectively high-loading amount in graphene-based composites are still a big challenge. This project proposed a strategy for fabrication of ultrathin MnO2 sandwich-like composite with graphene quantum dot (GQD) filling. Aiming to fabrication of ultrathin MnO2/GQD sandwich-like composite, the effect laws and control mechanisms of the size and surface groups of GQD on the structure of products would be systematically investigated. The in-situ deposition rules of MnO2 on the double-face of GQD would be also demonstrated in this proposal. Furthermore, the relationship between sandwich-like nanostructure of as-prepared products and supercapacitance performance would be detailedly analyzed. The strategy of preparation of ultrathin MnO2/GQD sandwich-like composite will illuminate other ultrathin metal oxide composites and bring significance for improvement of in-plane electroconductivity and power density of other transition ultrathin metal oxides.

英文关键词： manganese dioxide;graphene quantum dots;ultrathin sandwich-like structure;electroconductivity;supercapacitance performance