Pd/WO_3-RGO纳米催化剂对甲酸氧化的电催化性能

采用表面修饰技术将WO_3晶粒引入到氧化石墨烯(GO)表面,通过硼氢化钾还原法制备了载钯催化剂Pd/WO_3-RGO.对催化剂进行了结构和形貌表征,并考察了该催化剂对甲酸氧化的电催化性能.结果表明,Pd/WO_3-RGO催化剂由石墨烯、单斜态WO_3和立方面心Pd晶粒组成,Pd颗粒均匀分散在载体上;使用Pd/20%WO_3-RGO催化剂电极时的甲酸氧化最大峰电流密度大幅增加,是Pd/RGO催化剂电极甲酸氧化峰电流密度的2.5倍;Pd/WO_3-RGO催化剂稳定性大大增强,且具有更加优异的抗CO中毒能力;Pd晶粒与WO_3晶粒的相互交叠有利于它们之间的催化协同效应,增强催化剂的催化性能.

Performance of WO3 Modified Graphene Supported Pd Nanocatalysts for Formic Acid Electro-oxidation

The composites WO3-GO were prepared by the modification of WO3 crystal particles onto the surface of graphene oxide(GO), Pd/WO3-RGO catalysts were prepared by using potassium borohydride as the reducing agent.The performances of the catalysts and the effect of different contents of WO3 on the catalytic activity were investigated.The Pd/WO3-RGO catalysts showed significantly enhanced electrocatalytic performances for formic acid oxidation.The peak current density on the best catalyst Pd/20%WO3-RGO catalyst was 2.5 times that on Pd/RGO catalyst.And more importantly, Pd/WO3-RGO catalysts showed improved stability and excellent tolerance to CO poisoning.According to XRD, TEM and HRTEM results, Pd/WO3-RGO catalysts are made of monoclinic WO3, face centered cubic palladium crystal particles and graphene.WO3 particles are most likely to be covered or overlapped with Pd particles and Pd nanoparticles have a uniform distribution.The enhanced catalytic activity of Pd/WO3-RGO can be ascribed to the interaction between Pd and WO3.