Controlling the nanostructures and chemical compositions of the electrochemical nanocatalysts has been recognized as two prominent means to kinetically promote the electrocatalytic performance. Herein, we report a general “dual”-template synthesis methodology for the formation of multimetallic hollow mesoporous nanospheres (HMSs) with an adjustable interior hollow cavity and cylindrically opened mesoporous shell as a highly efficient electrocatalyst for ethanol oxidation reaction. Three-dimensional trimetallic PdAgCu HMSs were synthesized via in situ coreduction of Pd, Ag, and Cu precursors on “dual”-template structural directing surfactant of dioctadecyldimethylammonium chloride in optimal synthesis conditions. Due to synergistic advantages on hollow mesoporous nanostructures and multimetallic compositions, the resultant PdAgCu HMSs exhibited significantly enhanced electrocatalytic performance toward ethanol oxidation reaction with a mass activity of 5.13 A mg_Pd^–1 at a scan rate of 50 mV s^–1 and operation stability (retained 1.09 A mg_pd^–1 after the electrocatalysis). The “dual”-template route will open a new avenue to rationally design multimetallic HMSs with controlled functions for broad applications.

中文翻译：

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具有协同结构和组成效应的高效乙醇电氧化的多金属空心介孔纳米球

控制电化学纳米催化剂的纳米结构和化学组成已被认为是在动力学上促进电催化性能的两种主要方法。本文中，我们报告了一种通用的“双”模板合成方法，该方法可形成具有可调内部空心腔和圆柱形开口介孔壳的多金属空心介孔纳米球（HMS），作为乙醇氧化反应的高效电催化剂。通过在最佳合成条件下，在氯化二十八烷基二甲基铵的“双”模板结构导向表面活性剂上将Pd，Ag和Cu前体原位共核，合成了三维三金属PdAgCu HMS。由于中空介孔纳米结构和多金属成分的协同优势，_Pd ^–1的扫描速率为50 mV s ^–1和操作稳定性（电_催化后保留1.09 A mg _pd ^–1）。“双重”模板路线将为合理设计具有受控功能的多金属HMS开辟新的途径，以实现广泛的应用。