High-Yield Synthesis of Crystal-Phase-Heterostructured 4H/fcc Au@Pd Core-Shell Nanorods for Electrocatalytic Ethanol Oxidation
High-Yield Synthesis of Crystal-Phase-Heterostructured 4H/fcc Au@Pd Core-Shell Nanorods for Electrocatalytic Ethanol Oxidation
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DOI：
10.1002/adma.201701331
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发表时间：
2017-09-27
影响因子：
29.4
通讯作者：
Zhang, Hua
中科院分区：
文献类型：
--
作者：
Chen, Ye;Fan, Zhanxi;Zhang, Hua
例如，贵金属纳米材料由于其在电化学催化等方面的前景广阔的应用而吸引了越来越多的研究兴趣。尽管人们在贵金属纳米材料的尺寸、形状和结构控制合成方面付出了巨大努力，但其晶相控制合成仍处于起步阶段。在此，本研究首次报告通过一锅湿化学方法高产率合成具有交替 4H/面心立方 (fcc) 晶相异质结构的金纳米棒 (NR)。 4H和fcc相的共存相对稳定，4H/fcc Au NRs可以作为其他金属晶相控制外延生长的模板。例如，双金属 4H/fcc Au@Pd 核壳 NR 是通过 Pd 在 4H/fcc Au NR 上外延生长合成的。值得注意的是，4H/fcc Au@Pd NR 对乙醇氧化反应表现出优异的质量活性，分别是商业 Pd 黑和 Pt/C 催化剂的 6.2 和 4.9 倍。人们相信这种新的合成策略可用于制备其他新型催化剂，用于各种有前景的应用。
Noble-metal nanomaterials are attracting increasing research interest due to their promising applications in electrochemical catalysis, for example. Although great efforts have been devoted to the size-, shape-, and architecture-controlled synthesis of noble-metal nanomaterials, their crystal-phasecontrolled synthesis is still in its infancy. Here, for the first time, this study reports high-yield synthesis of Au nanorods (NRs) with alternating 4H/face-centered cubic (fcc) crystal-phase heterostructures via a one-pot wet-chemical method. The coexistence of 4H and fcc phases is relatively stable, and the 4H/fcc Au NRs can serve as templates for crystal-phase-controlled epitaxial growth of other metals. As an example, bimetallic 4H/fcc Au@Pd core-shell NRs are synthesized via the epitaxial growth of Pd on 4H/fcc Au NRs. Significantly, the 4H/fcc Au@Pd NRs show superior mass activity toward the ethanol oxidation reaction, i.e., 6.2 and 4.9 times those of commercial Pd black and Pt/C catalysts, respectively. It is believed that this new synthetic strategy can be used to prepare other novel catalysts for various promising applications.