Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (7): 1035-1056.DOI: 10.1016/S1872-2067(19)63385-1

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Crystal phase regulation in noble metal nanocrystals

Qiaoli Chen, Tianchun Cheng, Hongya Fu, Yihan Zhu   

  1. College of Chemical Engineering and State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
  • Received:2019-03-10 Revised:2019-04-25 Online:2019-07-18 Published:2019-05-24
  • Supported by:

    This work was supported by Zhejiang Provincial Natural Science Foundation of China (LR18B030003), the National Natural Science Foundation of China (21771161, 51701181), and the Thousand Talents Program for Distinguished Young Scholars.

Abstract:

Noble metal nanocrystals (NCs) are often densely packed in their most stable forms that are determined by a combination of effects arising from the electronic, magnetic, geometric, and phononic properties of the NCs. These packing modes usually include the densest packed polytypes of Barlow packings and more open or distorted packings with slightly lower atomic packing factors. The structural modulation strategies of NCs towards the better performances for diverse applications are usually limited to the crystal size, shape, and surface control, which have been robustly studied and documented. An exciting emerging field related to structural engineering of noble metal NCs turns out to be the crystal phase control, which allows the chemical synthesis of energetically high-lying phases of NCs and leads to intriguing performances in catalysis and energy conversion. This article provides a comprehensive review of crystal phase regulation that endows both noble metal and noble-metal-based alloy NCs with unique electronic structures and enhanced performances. The basic principles, general design rationale, synthetic approaches, and structural characterizations for a variety of successful case studies related to crystal phase engineering are reviewed and discussed. In the end, the perspectives and challenges associated with the development of a more controllable chemical synthetic strategy towards the high-energy phases of noble metal NCs are put forward.

Key words: Crystal phase, Noble metals, Nanocrystals, Dense packing, Chemical synthesis