Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (7): 1196-1206.DOI: 10.1016/S1872-2067(17)62840-7

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Fabrication of a highly dispersed Pdcore@Ptshell electrocatalyst for the oxygen reduction reaction

Longsheng Caoa,b, Shangfeng Jianga,b, Geng Zhangc, Xuejun Tanga,b, Xiaoping Qina, Zhigang Shaoa, Baolian Yia   

  1. a Fuel Cell System and Engineering Group, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
    b University of Chinese Academy of Sciences, Beijing 100049, China;
    c Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan 430070, Huibei, China
  • Online:2017-07-18 Published:2017-06-27
  • Contact: 10.1016/S1872-2067(17)62840-7
  • Supported by:

    This work was supported by the National Major Research Project (2016YFB0101208), the National Natural Science Foundation of China (21576257) and the Natural Science Foundation-Liaoning United Fund (U1508202).

Abstract:

Core-shell nanostructures have been widely investigated to improve the electrocatalytic perfor-mance of platinum. However, organic precursors, surfactants or high temperature are usually nec-essary during the preparation procedure. Unfortunately, these requirements limit the application of these methods on a large scale. Herein, a Pdcore@Ptshell nanostructure was fabricated through the reduction of K2PtCl4 by dissociated hydrogen at room temperature without the assistance of either a surfactant or a high-boiling point solvent. The shell thickness of this nanostructure was successfully controlled by varying the amount of K2PtCl4; core-shell nanoparticles with a shell thickness of 0.45, 0.75 and 0.90 nm were obtained, as determined by TEM. The remarkable crystallinity and epitaxial growth of the Pdcore@Ptshell nanostructure were revealed by HRTEM and EDS. According to ICP and XPS, surface segregation of Pt was established. The impressive ORR performance was attributed to the weak adsorption strength of the OHads species, which resulted from the electron transfer impact between the Pdcore and Ptshell. The facile and clean preparation method can be used to prepare other core-shell nanostructures under a mild atmosphere.

Key words: Pdcore@Ptshell, Dissociated hydrogen, Oxygen reduction, Electrocatalysis, Core shell