Crystal Phase and Architecture Engineering of Lotus- Thalamus-Shaped Pt-Ni Anisotropic Superstructures for Highly Efficient Electrochemical Hydrogen Evolution

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

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Crystal Phase and Architecture Engineering of Lotus- Thalamus-Shaped Pt-Ni Anisotropic Superstructures for Highly Efficient Electrochemical Hydrogen Evolution

机译：莲花-丘脑形Pt-Ni各向异性上部结构的晶相和结构工程，可高效释放氢气

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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.

机译：具有特定组成，形态，表面结构和晶相的各向异性3D纳米结构的合理设计和合成对其多样化的应用至关重要。在这里，报道了通过简便的一锅溶剂热法合成晶状莲花-丘脑形Pt-Ni各向异性超结构。具有Pt富集表面的Pt-Ni AS由一个富Ni的芯和一个面心居中的立方（fcc）相，从该芯突出的六角形密堆积相的Ni富集的臂，以及经面选择性生长的Pt-Ni手臂末端表面上带有fcc相的丰富莲子。令人印象深刻的是，与市售Pt / C和先前报道的电催化剂相比，这些独特的Pt-Ni AS在碱性条件下表现出优异的电催化活性和对氢析出反应的稳定性。在10 mA cm（-2）的电流密度下，获得的过电势低至27.7 mV，在50 mV的过电势下，转换频率达到18.63 H-2 s（-1）。这项工作为合成具有空间异质性的高度各向异性的超结构提供了新的策略，以增强其在催化反应中的应用前景。

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来源
《Advanced Materials》 |2018年第30期|1801741.1-1801741.7|共7页
作者
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;
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Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

Zhejiang Univ Technol, Dept Chem Engn, Hangzhou 310014, Zhejiang, Peoples R China;

Chinese Acad Sci, Univ Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Collaborat Innovat Ctr Quantum Matter,Sch Phys Sc, Beijing 100190, Peoples R China;

Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

ASTAR, Inst Chem & Engn Sci, Singapore 627833, Singapore;

ASTAR, Inst Chem & Engn Sci, Singapore 627833, Singapore;

ASTAR, Inst Chem & Engn Sci, Singapore 627833, Singapore;

Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

Chinese Acad Sci, Univ Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Collaborat Innovat Ctr Quantum Matter,Sch Phys Sc, Beijing 100190, Peoples R China;

ASTAR, IMRE, 2 Fusionopolis Way,Innovis 08-03, Singapore 138634, Singapore;

ASTAR, IMRE, 2 Fusionopolis Way,Innovis 08-03, Singapore 138634, Singapore;

King Abdullah Univ Sci & Technol, Adv Membranes & Porous Mat Ctr, Phys Sci & Engn Div, Thuwal 239556900, Saudi Arabia;

Chinese Acad Sci, Univ Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys,Inst Phys, Collaborat Innovat Ctr Quantum Matter,Sch Phys Sc, Beijing 100190, Peoples R China;

Nanyang Technol Univ, Sch Mat Sci & Engn, Ctr Programmable Mat, 50 Nanyang Ave, Singapore 639798, Singapore;

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正文语种 eng
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关键词
anisotropic structures; crystal structures; electrocatalysis; hydrogen evolution reaction; Pt-Ni alloys;

机译：各向异性结构;晶体结构;电催化;析氢反应;Pt-Ni合金;

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Crystal Phase and Architecture Engineering of Lotus- Thalamus-Shaped Pt-Ni Anisotropic Superstructures for Highly Efficient Electrochemical Hydrogen Evolution

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