Shen Ling, Ying Jie, Tian Ge, Jia Mingpu, Yang Xiao-Yu
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of Materials Science and Engineering & International School of Materials Science and Engineering, Wuhan University of Technology, 122, Luoshi Road, Wuhan, 430070, P. R. China.
School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, 519082, P. R. China.
Chem Asian J. 2021 May 3;16(9):1130-1137. doi: 10.1002/asia.202100156. Epub 2021 Mar 30.
The rational synthesis of Pt-based alloyed nanowires still remains a great challenge because of the different reduction potentials between Pt and another metal and the intrinsic feature of isotropic growth in face-centered cubic (fcc) structured Pt. In this work, PtPd alloyed nanowires with ultrahigh aspect ratio anchored on graphene (PtPd NWs/graphene) were synthesized by a facile solvothermal method without the use of any templates or surfactants. Due to the integration of ultralong PtPd nanowires and stable graphene support, PtPd NWs/graphene exhibited outstanding electrochemical activity toward methanol oxidation reaction (MOR) in comparison with pure Pt NWs/graphene and commercial Pt/C catalysts. Meanwhile, PtPd NWs/graphene had a much higher current density than Pt NWs/graphene and commercial Pt/C catalysts at a constant potential for 7200s in alkaline methanol solution. Moreover, after 1000 cycles of durability testing, PtPd NWs/graphene retained 89.2% of its initial mass activity, much superior to the 63.7% retained for commercial Pt/C.
由于铂与其他金属之间不同的还原电位以及面心立方（fcc）结构铂的各向同性生长的固有特性，基于铂的合金纳米线的合理合成仍然是一个巨大的挑战。在这项工作中，通过一种简便的溶剂热法，在不使用任何模板或表面活性剂的情况下，合成了锚定在石墨烯上的具有超高纵横比的铂钯合金纳米线（PtPd NWs/石墨烯）。由于超长铂钯纳米线与稳定的石墨烯载体的结合，与纯铂纳米线/石墨烯和商业铂碳催化剂相比，PtPd NWs/石墨烯对甲醇氧化反应（MOR）表现出优异的电化学活性。同时，在碱性甲醇溶液中，在恒定电位下持续7200秒时，PtPd NWs/石墨烯的电流密度比铂纳米线/石墨烯和商业铂碳催化剂高得多。此外，经过1000次耐久性测试后，PtPd NWs/石墨烯保留了其初始质量活性的89.2%，远优于商业铂碳保留的63.7%。
