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Enhanced Electrocatalysis via 3D Graphene Aerogel Engineered with a Silver Nanowire Network for Ultrahigh-Rate Zinc-Air Batteries

机译：通过银纳米线网络设计的3D石墨烯气凝胶增强的电催化作用，用于超高速率锌空气电池

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摘要

3D graphene aerogel (GA) integrated with active metal or its derivatives has emerged as a novel class of multifunctional constructs with range of potential applications. However, GA fabricated by self-assembly in the liquid phase still suffers from low conductivity and poor knowledge related to spatial active phase distribution and 3D structure. To address these issues, a facile approach involving in situ integration of 1D silver nanowire (AgNW) during gelation of graphene oxide flakes is presented. AgNWs prevent the restacking of graphene sheets and act as an efficient electron highway and Ag source for deposition of ultrasmall Ag nanocrystals (AgNCs). When applied as the cathodic electrocatalyst in a zinc-air battery, the 3D GA integrated with 0D AgNCs and 1D AgNWs permit ultrahigh discharge rates of up to 300 mA cm(-2). Moreover, for the first time, with the help of phase-contrast X-ray computed microtomography, the interconnected porous network of millimeter-sized GA and a full-field view of the macrodistribution of Ag is delivered, offering the vitally complementary macroscopic structure information, which has been missing in previous reports.
机译：集成有活性金属或其衍生物的3D石墨烯气凝胶（GA）已作为具有潜在应用范围的新型多功能构造出现。但是，在液相中通过自组装制造的GA仍具有电导率低以及与空间活性相分布和3D结构相关的知识不足的缺点。为了解决这些问题，提出了一种在石墨烯氧化物薄片胶凝过程中涉及一维银纳米线（AgNW）原位集成的简便方法。 AgNWs可以防止石墨烯片的重新堆积，并可以用作沉积超小型Ag纳米晶体（AgNC）的有效电子通道和Ag源。当用作锌-空气电池中的阴极电催化剂时，与0D AgNC和1D AgNW集成的3D GA允许高达300 mA cm（-2）的超高放电速率。此外，借助相衬X射线计算机断层摄影术，首次提供了相互连接的毫米级GA多孔网络和Ag宏观分布的全视野图，提供了至关重要的宏观结构信息，以前的报告中没有。

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  • 来源
    《Advanced Functional Materials》 |2017年第18期|1700041.1-1700041.11|共11页
  • 作者

    Hu Shang; Han Ting; Lin Chao; Xiang Weikai; Zhao Yonghui; Gao Peng; Du Fuping; Li Xiaopeng; Sun Yuhan;

  • 作者单位

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China|Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China|ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China|Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China;

    Chinese Acad Sci, SARI, CAS Key Lab Low Carbon Convers Sci & Engn, Shanghai 201210, Peoples R China|ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China;

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