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Updated: Mar 16, 2026
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Published on: December 4, 2014
Crystallinity-induced shape evolution of Pt-Ag nanosheets from branched nanocrystals
Azhar Mahmood1, Faisal Saleem1, Haifeng Lin1
1Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China. wangxun@mail.tsinghua.edu.cn.
Abstract:
Crystallinity offers countless opportunities for the controlled synthesis of multimetallic 2D and 3D nanomaterials. Herein we have successfully synthesized 2D Pt-Ag ultrathin nanosheets through the oxidative etching of twin seeds and 3D Pt-Ag-Cu tetrapods via altering the crystallinity through the incorporation of copper into the Pt-Ag alloy. A better electrocatalytic activity is obtained for the oxidation of formic acid which is 3.8 times higher than that of a commercial platinum catalyst as the stepped surface atom densities are higher on the nanosheets.
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