title: Crystallinity-induced shape evolution of Pt-Ag nanosheets from branched nanocrystals.
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.
authors: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China. wangxun@mail.tsinghua.edu.cn.
authors: Azhar
authors: A
authors: Mahmood
authors: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China. wangxun@mail.tsinghua.edu.cn.
authors: Faisal
authors: F
authors: Saleem
authors: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China. wangxun@mail.tsinghua.edu.cn.
authors: Haifeng
authors: H
authors: Lin
authors: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China. wangxun@mail.tsinghua.edu.cn.
authors: Bing
authors: B
authors: Ni
authors: Key Lab of Organic Optoelectronics and Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China. wangxun@mail.tsinghua.edu.cn.
authors: Xun
authors: X
authors: Wang