【摘要】 采用对氨基苯磺酸对氧化石墨烯(GO)进行表面功能化,进而负载贵金属Pd,解决了Pd团聚和不易在载体表面负载的问题,从而提高了Pd基催化剂对于甲酸的催化能力。实验研究了相同实验条件下,Pd在氧化石墨烯、还原石墨烯(RGO)和磺化处理的石墨烯(SGO)表面的分散和负载量以及得到的复合催化剂的催化性能。实验结果表明,SGO更容易负载贵金属,得到的催化剂对O2气的电催化还原能力优于Pd/GO和Pd/RGO,此外Pd/SGO催化剂对CO的耐受力也明显提升,这可能是苯环上的π-π键和—SO3H的范德华力协同作用更有利于Pd的固定与分散。对Pd/SGO催化氧还原的机理也进行了分析,该氧还原为2电子反应过程。更多还原

【Abstract】 In this work,the surface of GO was functionalized by different method and used to load noble metal Pd.It is found that the surface modification of GO can effectively enhance the loading amount of Pd and reduce the Pd agglomeration on the support surface,and thereby improve the catalytic activity of Pd-based catalyst for oxidation of formic acid.The activity of Pd-based electrocatalyst toward the oxygen reductionreaction(ORR) was examined using cyclic voltammetry through roating-disk electrode measurements in0.5 mol/L H2SO4electrolyte.Under the same experimental conditions,the loading amount and the catalytic performance of Pd on graphene oxide(GO),reduced graphene oxide(RGO) and sulfonated graphene(SGO)were studied.The results show that SGO is easier to load Pd and the obtained composite catalyst for CO tolerance is also improved significantly,which may be due to the synergetic effect from the π-π bonding of graphene and the van der Waals interactions of the —SO3H functionality,enhancing the loading and dispersion of Pd on the supporting materials effectively.更多还原