石墨烯基电催化剂的合成与燃料电池性能研究

Synthesis of the RGO/TiO2/Pt Electrocatalytic Nanocomposites and Its Performance in Fuel Cells

为了满足人们对绿色能源的迫切需求,生物乙醇及其清洁能源转换设备,如直接醇类燃料电池(DAFCs)吸引了越来越多人的关注,尤其是在设计和开发有效的阳极催化材料方面。采用溶剂热和紫外光还原法制备了石墨烯/二氧化钛/铂(RGO/TiO2/Pt)复合电催化材料。产物的形貌和结构分别采用扫描电子显微镜(SEM)、X-射线粉末衍射(XRD)、傅里叶变换红外光谱仪(FT-IR)等手段进行表征。形貌和结构分析结果表明,氧化石墨烯已被还原成石墨烯,铂纳米粒子均匀分散在石墨烯/二氧化钛界面。进一步研究了这种复合物的电催化性能;循环伏安等电化学研究表明:与铂和石墨烯/铂相比,石墨烯/二氧化钛/铂复合材料具有更高的催化活性和稳定性,有望成为新型高效的直接醇类燃料电池(DAFCs)的电催化材料。

In order to meet the people＇s demands for green energy, bio ethanol and clean energy conversion equipment, such as direct alcohol fuel cell （DAFCs） has attracted the attention of more and more people, especially in the design and development of effective anode catalytic materials. The RGO/TiO2 and RGO/TiO2/Pt electrocatalytic nanocomposites were prepared by solvothermal reduction and UV photoreduction technique, respectively. The morphologies and structures of the as - prepared nanoeomposites were extensively investigated by scanning electron microscopy （SEM）, X -ray diffraction （XRD） and FT- IR. The characterization of morphology and nanostructure shows that the graphene oxide has been reduced to graphene and Pt nanoparticles were well dispersed in the interface between graphene and TiO2. Cyclic vohammetric （CV） and ehronoamperometrie ex- periments indicate that RGO/TiO2/Pt electrocatalysts have much higher activity and stability compared to conventional graphene supported Pt electrocatalysts. The results showed that RGO/TiO2/Pt electrocatalysts are promising for use in direct alcohol fuel cells （DAFCs）.