摘要 以氨水为碱源,在二维纳米材料氧化石墨烯（GO）两侧原位垂直生长CoAl-LDH（LDH为层状双金属氢氧化物）纳米阵列,制备了三明治结构的LDH/GO复合材料,采用XRD、SEM、TEM、AFM、拉曼光谱、XPS对其结构进行了表征。进一步利用真空抽滤技术制备了LDH/GO自支撑薄膜,经水合肼蒸气还原后,获得了LDH/rGO（rGO为还原氧化石墨烯）复合薄膜电极材料,并研究了它的超电容性能。实验结果表明,LDH能发生可逆氧化还原反应,电化学活性较高,可为电化学反应提供大量的活性位点;rGO的导电性较好,有助于实现快速的大电流充放电;三明治结构具有较大的比表面积及丰富的孔道结构,显著提高了活性组分的利用率。二者复合有利于发挥组分间的协同效应,显著提高材料的超电容性能。与rGO相比,LDH/rGO的充放电性能明显提升,当电流密度为1 A/g时,比电容为340 F/g。

关键词 ： 层状双金属氢氧化物,  多级结构,  超级电容器,  自支撑薄膜,  能量储存与转换    

Abstract：Sandwich-like nanocomposites with CoAl layered double hydroxide(LDH) grown on both sides of graphene oxides were synthesized via a novel strategy. It is found that the CoAl-LDH nanosheet arrays grow perpendicularly and uniformly on both sides of graphene oxide nanosheets,constructing a hierarchical three-dimensional nanocomposite with a well-defined sandwich structure. This uniquely structured nanocomposite has a large specific surface area and typical mesoporous distribution,which is favorable for achieving high pseudocapacitance performance. The free-standing LDH/rGO(rGO,reduced graphene oxide) film exhibits a specific capacitance of 340 F/g(current density 1 A/g) with good cycling stability. The one-pot strategy may pave a way to design and fabricate hierarchical LDH/rGO composites with interesting structures for potential application in supercapacitors and other fields.

Key words： layered double hydroxide   hierarchical structure   supercapacitor   free-standing film   energy storage and conversion   

收稿日期: 2016-10-25     

PACS: TQ426.8  

基金资助:国家高技术研究发展计划项目（2013AA032501）; 教育部博士点基金项目（20120010120010）

作者简介: 周阿武（1989-）,男,浙江省温州市人,博士生,电邮 zhouawu@126.com。联系人：韩景宾,电话 010-64412131,电邮 hanjb@mail.buct.edu.cn。

引用本文:   

周阿武，罗同同，刘晓西，豆义波，韩景宾. 自支撑LDH/rGO复合薄膜的制备及其超电容性能[J]. 石油化工, 2016, 45(12): 1420-1426. Zhou Awu, Luo Tongtong, Liu Xiaoxi, Dou Yibo, Han Jingbin. Fabrication of flexible free-standing LDH/rGO film electrode for supercapacitor. Petrochemical Technology, 2016, 45(12): 1420-1426.