泡沫镍负载石墨烯/钯复合催化剂制备及电催化偏二甲肼研究

Preparation of Nickel Foam Loaded Graphene/Palladium Composite Catalyst and Application on Electrocatalytic UDMH

为了解决电化学方法处理偏二甲肼(Unsymmetrical Dimethylhydrazine,UDMH)污染时,常用的碳基电催化剂贵金属含量较高、价格昂贵的问题,采用化学浸渍法制备泡沫镍负载石墨烯/钯复合催化剂,分析了氧化石墨烯浓度、PdCl2浓度和pH值对催化剂性能的影响,运用扫描电子显微镜、X射线能谱和X射线衍射表征了催化剂的表面形貌和结构特征。将复合催化剂应用于构建UDMH-质子交换膜燃料电池,测试了电池的性能。结果表明:大比表面积的氧化石墨烯浓度变化是影响复合电极电催化性能的主要因素;在氧化石墨烯浓度为1 mg/mL、PdCl2浓度为0.2 mol/L、pH=3的条件下,UDMH氧化峰电流密度最大;所制备的燃料电池可获得最大开路电压0.9 V、最大功率密度0.61mW/cm^(2)的性能输出。

In existing electrochemical treatment for unsymmetrical dimethylhydrazine(UD-MH),the commonly used carbon-based electrocatalysts have high precious metal content and are expensive.To solve the problem,nickel foam loaded graphene/palladium composite catalysts were prepared by chemical impregnation method.Furthermore,effects of the main factors such as graphene oxide concentration,PdCl2 concentration and pH were analyzed.Simultaneously,the surface morphology and structure of the catalyst were characterized by SEM,EDS and XRD.Additionally,the prepared composite catalyst was applied to construct a UDMH proton exchange membrane fuel cell(UDMH-PEMFC).The perfomance of the UDMH-PEMFC was tested.Results showed that the variation of graphene oxide concentration with a large specific surface ar-ea was the main influencing factor on the electrocatalytic performance of the composite electrode.The maximum current density of the UDMH oxidation peak was achieved at a graphene oxide concentration of 1 mg/mL,a PdCl2 concentration of 0.2 mol/L as well as pH=3.The prepared fu-el cell could have a performance output with a maximum open-circuit voltage of 0.9 V and a max-imum power density of 0.61 mW/cm^(2).