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Abstract
Selective oxidative etching is one of the most effective ways to prepare hollow nanostructures and nanocrystals with specific exposed facets. The mechanism of selective etching in noble metal nanostructures mainly relies on the different reactivity of metal components and the distinct surface energy of multimetallic nanostructures. Recently, phase engineering of nanomaterials (PEN) offers new opportunities for the preparation of unique heterostructures, including heterophase nanostructures. However, the synthesis of hollow multimetallic nanostructures based on crystal-phase-selective etching has been rarely studied. Here, a crystal-phase-selective etching method is reported to selectively etch the unconventional 4H and 2H phases in the heterophase Au nanostructures. Due to the coating of Pt-based alloy and the crystal-phase-selective etching of 4H-Au in 4H/face-centered cubic (fcc) Au nanowires, the well-defined ladder-like Au@PtAg nanoframes are prepared. In addition, the 2H-Au in the fcc-2H-fcc Au nanorods and 2H/fcc Au nanosheets can also be selectively etched using the same method. As a proof-of-concept application, the ladder-like Au@PtAg nanoframes are used for the electrocatalytic hydrogen evolution reaction (HER) in acidic media, showing excellent performance that is comparable to the commercial Pt/C catalyst. © 2024 The Author(s). Small Methods published by Wiley-VCH GmbH.
Original language | English |
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Article number | 2400430 |
Journal | Small Methods |
Volume | 8 |
Issue number | 11 |
Online published | 6 Jul 2024 |
DOIs | |
Publication status | Published - 20 Nov 2024 |
Funding
F.S., G.L., Guigao Liu, and B.C. contributed equally to this work. H.Z. acknowledges the financial support from the Research Grants Council of Hong Kong (GRF Project No. 11301721, AoE/P\u2010701/20), ITC via the Hong Kong Branch of the National Precious Metals Material Engineering Research Center (NPMM), and the grants (Project No.1886921, 9678272, and 9610663) and Start\u2010Up Grant (Project No.9380100) from City University of Hong Kong. L.L. thanks for the support from the Hong Kong Scholars Program (Project No. XJ2019008).
Research Keywords
- Au nanostructures
- crystal phase engineering
- heterophase
- selective etching
Publisher's Copyright Statement
- This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/
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- 2 Active
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GRF: Synthesis of Amorphous/Crystalline Heterophase Metal Nanomaterials for Catalysis
ZHANG, H. (Principal Investigator / Project Coordinator)
1/01/22 → …
Project: Research
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AoE(UGC)-ExtU-Lead: 2D Materials Research: Fundamentals Towards Emerging Technologies
Yao, W. (Main Project Coordinator [External]) & ZHANG, H. (Principal Investigator / Project Coordinator)
1/03/21 → …
Project: Research