Designed Formation of Hollow Pt Nanocrystals Supported on MoOx‑Modified Carbon for High-Performance Methanol Electro-Oxidation
journal contributionposted on 19.09.2018, 00:00 by Zhenzhen Yang, Mengmeng Li, Peng Cui, Genlei Zhang, Xinde Jiang, Yuxin Wang
In this study, we develop an efficient electrocatalyst for methanol oxidation, Pt nanocrystals (NCs) with hollow structure immobilized on MoOx-modified carbon black (h-Pt/MoOx-C). The MoOx-C is fabricated by phosphomolybdic acid self-assembly on carbon black. The h-Pt/MoOx-C evolved from Ag@Pt core–shell NCs deposited on MoOx-C in saturated NaCl aqueous solution containing NH4OH. Because of the presence of MoOx, the electrocatalyst of solid Pt NCs anchored on MoOx-C (Pt/MoOx-C) for methanol oxidation exhibits about 3.4 times higher electrocatalytic activity than solid Pt NCs anchored on carbon black (Pt/C–H). The mass activity of h-Pt/MoOx-C is 2.4 times greater than that of Pt/MoOx-C, ascribing to the unique hollow structure. Furthermore, the h-Pt/MoOx-C also exhibits better tolerance to poisoning species and is more stable under electro-oxidation conditions.