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Crystal Phase and Architecture Engineering of Lotus‐Thalamus‐Shaped Pt‐Ni Anisotropic Superstructures for Highly Efficient Electrochemical Hydrogen Evolution
Author(s) -
Zhang Zhicheng,
Liu Guigao,
Cui Xiaoya,
Chen Bo,
Zhu Yihan,
Gong Yue,
Saleem Faisal,
Xi Shibo,
Du Yonghua,
Borgna Armando,
Lai Zhuangchai,
Zhang Qinghua,
Li Bing,
Zong Yun,
Han Yu,
Gu Lin,
Zhang Hua
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201801741
Subject(s) - overpotential , materials science , phase (matter) , electrochemistry , chemical engineering , anisotropy , nanotechnology , crystal (programming language) , tafel equation , crystallography , electrode , chemistry , organic chemistry , physics , quantum mechanics , computer science , engineering , programming language
The rational design and synthesis of anisotropic 3D nanostructures with specific composition, morphology, surface structure, and crystal phase is of significant importance for their diverse applications. Here, the synthesis of well‐crystalline lotus‐thalamus‐shaped Pt‐Ni anisotropic superstructures (ASs) via a facile one‐pot solvothermal method is reported. The Pt‐Ni ASs with Pt‐rich surface are composed of one Ni‐rich “core” with face‐centered cubic (fcc) phase, Ni‐rich “arms” with hexagonal close‐packed phase protruding from the core, and facet‐selectively grown Pt‐rich “lotus seeds” with fcc phase on the end surfaces of the “arms.” Impressively, these unique Pt‐Ni ASs exhibit superior electrocatalytic activity and stability toward the hydrogen evolution reaction under alkaline conditions compared to commercial Pt/C and previously reported electrocatalysts. The obtained overpotential is as low as 27.7 mV at current density of 10 mA cm −2 , and the turnover frequency reaches 18.63 H 2 s −1 at the overpotential of 50 mV. This work provides a new strategy for the synthesis of highly anisotropic superstructures with a spatial heterogeneity to boost their promising application in catalytic reactions.