Synthesis and Durability of Highly Dispersed Platinum Nanoparticles Supported on Ordered Mesoporous Carbon and Their Electrocatalytic Properties for Ethanol Oxidation
journal contributionposted on 11.11.2010, 00:00 by Ming-Hui Chen, Yan-Xia Jiang, Shu-Ru Chen, Rui Huang, Jian-Long Lin, Sheng-Pei Chen, Shi-Gang Sun
In this work, we develop a novel method to prepare a well-dispersed platinum precursor in the modified mesoporous carbon-46 (MPC) by using a simple melt−diffusion strategy. After the Pt precursor was reduced by hydrogen gas, almost 100% platinum nanoparticle catalysts (Pt/MPC) were confined in the pores of MPC. Physical (XRD, HRTEM, and BET), electrochemical, and in situ FTIR spectroscopic methods were used to investigate the properties of the Pt/MPC. The HRTEM image illustrates that Pt nanoparticles (NPs) of ca. 2−3 nm are loaded inside the small mesopores of the pore walls and NPs of ca. 5−6 nm are in the mesochannels of the MPC, and the Pt loading in Pt/MPC is 35 wt %. In comparison with the commercial Pt/C catalysts (40 wt %, Johnson Matthey), the Pt/MPC displays a high activity toward ethanol oxidation. The Pt/MPC exhibits also a high durability after a long-time potential scan: the loss of catalytic surface area is only 4.73% for Pt/MPC, whereas it is 14.75% for Pt/C. Moreover, in situ FTIR studies demonstrate that the Pt/MPC can promote the cleavage of the C−C bond of ethanol.