Preparation and enhanced electrocatalytic activity of Pt-modified Pd/graphene nanocomposites for ethylene glycol oxidation

doi:10.16085/j.issn.1000-6613.2015.04.020

Abstract

Abstract: Pd nanoparticles/graphene (Pd/G) composites were fabricated via the chemical reduction method using graphite oxide and palladium nitrate,and then deposition of Pt on Pd/G was performed potentiostatically using chloroplatinic acid as precursor of platinum. Pt-modified Pd/G (Pt-Pd/G) electrodes with different platinum loadings were prepared. The microstructure of the Pt-Pd/G electrode was characterized by FE-SEM,EDX and TEM,and the results showed that metal nanoparticles with a mean diameter of 7.2 nm were evenly distributed on the surface of graphene. Electrochemical measurements revealed the high catalytic activity of Pt-Pd/G electrodes for ethylene glycol oxidation in alkaline solution. The peak current density on the Pt-Pd/G electrodes with a Pt:Pd atomic ratio of 1:42 was about 3.0 and 2.7 times higher than that on Pd/G and Pt/G electrodes,respectively. The catalytic activity of the Pd/G electrode was significantly improved by the deposition of a small amount of Pt. The modification method used in this study is simple but its effect is very obvious,and the approach can be used to modify other metal substrates with a second metal.

Key words: catalyst support, surface modification, nanomaterials, electrochemistry, catalysiss

摘要： 以氧化石墨(GO)和Pd(NO₃)₂为原料,通过化学还原法制备Pd纳米粒子-石墨烯(Pd/G)纳米复合材料,然后以H₂PtCl₆作为Pt前体,在Pd纳米粒子的表面恒电位沉积Pt,制备不同Pt负载量的Pd/G(Pt-Pd/G)电极.利用场发射扫描电镜(FE-SEM)、透射电镜(TEM)和X射线能谱仪(EDX)对材料的微观结构进行了表征和分析.结果显示石墨烯上的金属粒子分散均匀,平均粒径约7.2nm.电化学测试结果显示Pt-Pd/G电极对乙二醇电化学氧化反应具有良好的催化性能.当纳米粒子的Pt:Pd原子百分比为1:42时,其反应峰电流密度分别为Pd/G和Pt/G电极的3.0倍和2.7倍.少量的Pt沉淀可显著改进Pd/G电极的催化活性.本研究采用的修饰方法简单,修饰效果明显,可应用于其他金属纳米复合材料的异金属修饰.

关键词: 催化剂载体, 表面修饰, 纳米材料, 电化学, 催化

CLC Number:

TQ152

MA Xiangyu, JIN Changchun, DONG Rulin. Preparation and enhanced electrocatalytic activity of Pt-modified Pd/graphene nanocomposites for ethylene glycol oxidation[J]. Chemical Industry and Engineering Progree, 2015, 34(04): 1019-1022,1073.

马翔宇, 金长春, 董如林. Pt修饰的Pd/石墨烯纳米复合材料的制备及对乙二醇氧化反应的电催化活性[J]. 化工进展, 2015, 34(04): 1019-1022,1073.

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