二氧化锰/还原氧化石墨烯复合纳米材料电-热转化特性

采用天然石墨为原料,利用修正的Hummers法,成功合成氧化石墨烯(GO)。通过浸轧-烘干-焙烘、原位液相沉积和碳化工艺制备出MnO_2@C和MnO_2/rGO@C碳化样品,并与纯棉织物(C)碳化样品进行对比测试分析。采用SEM、EDS、XRD、ICP和元素分析等技术手段对碳化样品的表观形态、内部结构、元素组成及配比进行系统表征分析,并对其电-热转化特性进行探究。测试结果表明:棉织物表面附着的GO能为MnO_2纳米粒子提供更多沉积位点,其MnO_2沉积量是纯棉织物的2.4倍。经碳化处理后,GO还原为石墨烯,样品导电性能大幅度提高,电导率由38S/m(C)提高到90S/m(MnO_2/rGO@C)。此外,MnO_2/rGO@C具有突出的电-热转化特性。在外加电压~15V时,5min内,其温度可逐步递增至稳态最大值54℃。认为该研究成果可应用于智能保暖服饰的开发和能量转换领域,具有广阔的应用前景。

Electro-thermal Conversion Characteristics of MnO2/rGO Nano-composite

Graphene oxide (GO) was successfully synthesized by using natural graphite as raw material and modified Hummers method.MnO2@C and MnO2/rGO@C carbonized samples were prepared by padding-drying-curing,in-situ solution phase deposition and carbonization processes,and analyzed with the comparison of carbonized cotton fabric (C).Technology methods such as SEM,EDS,XRD,ICP and element analysis were applied to systematically characterize the surface morphology,internal structure,element composition and ratio of the carbonation products.And electro-thermal conversion characteristics of the sample were explored and tested.The results showed that MnO2 nano-particles deposited more on GO/cotton,which was 2.4 times of that on pure cotton fabric.After carbonization,GO was reduced to graphene and conductivity of sample was greatly improved.Conductivity increased from 38S/m (C) up to 90S/m (MnO2/rGO@C).Moreover,MnO2/rGO@C exhibited outstanding electro-thermal conversion characteristics.When the applied voltage was～15V,the temperature could gradually increase to the steady-state maximum 54℃ within 5mins.It was considered that this research achievement could be applied to the development of intelligent insulation clothing and energy conversion fields,which had broad application prospects in the future.