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首页> 外文期刊>Advanced Functional Materials >Micrometer-Sized RuO2 Catalysts Contributing to Formation of Amorphous Na-Deficient Sodium Peroxide in Na-O-2 Batteries
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Micrometer-Sized RuO2 Catalysts Contributing to Formation of Amorphous Na-Deficient Sodium Peroxide in Na-O-2 Batteries

机译：微米级RuO2催化剂有助于Na-O-2电池中非晶态Na缺乏过氧化钠的形成

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摘要

The results obtained herein demonstrate that the oxygen electrode plays a critical role in determining the morphology and chemical composition of discharge products in Na-O-2 batteries. Micrometer-sized cubic NaO2, film-like NaO2, and nano-sized amorphous spherical Na2-xO2 are characterized as the main discharge products on the surface of reduced graphite oxide (rGO), boron-doped rGO (B-rGO), and micrometer-sized RuO2 catalyst-coated B-rGO (m-RuO2-B-rGO) cathodes, respectively. The Na-O-2 battery with m-RuO2-B-rGO as the cathode exhibits a much longer cycle life than those with the other cathodes, maintaining an unchanged capacity (0.5 mAh cm(-2)) after 100 cycles at a current density of 0.05 mA cm(-2). A good rate capability and deep discharge-charge energy efficiency are also obtained. The excellent electrochemical performance of the battery is attributed to the effect of the micrometer-sized RuO2 catalyst. Owing to the high affinity of RuO2 for oxygen, the amorphous phase Na2-xO2 discharge product, which has good electrical contact with the RuO2 particles, can decompose completely under 3.1 V without a sudden voltage jump. Meanwhile, the micrometer-sized RuO2 catalysts also provide enough active sites and space for the reactions, and effectively minimize the occurrence of side reactions between discharge products and carbon defects.
机译：本文获得的结果证明，氧电极在确定Na-O-2电池中放电产物的形态和化学组成方面起着关键作用。微米级立方NaO2，薄膜状NaO2和纳米级非晶球形Na2-xO2被表征为还原型氧化石墨（rGO），掺硼rGO（B-rGO）和微米级表面上的主要放电产物尺寸的RuO2催化剂涂覆的B-rGO（m-RuO2-B-rGO）阴极。以m-RuO2-B-rGO为阴极的Na-O-2电池比使用其他阴极的Na-O-2电池具有更长的循环寿命，在电流下100次循环后保持不变的容量（0.5 mAh cm（-2））密度为0.05 mA cm（-2）。还获得了良好的速率能力和深的充放电能量效率。电池优异的电化学性能归因于微米级RuO2催化剂的作用。由于RuO2对氧气的高亲和力，与RuO2颗粒具有良好电接触的非晶态Na2-xO2放电产物可以在3.1 V下完全分解，而不会突然出现电压跳变。同时，微米级的RuO2催化剂还为反应提供了足够的活性位点和空间，并有效地减少了放电产物和碳缺陷之间副反应的发生。

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  • 来源
    《Advanced Functional Materials》 |2017年第30期|1700632.1-1700632.11|共11页
  • 作者

    Wu Feng; Xing Yi; Lai Jingning; Zhang Xiaoxiao; Ye Yusheng; Qian Ji; Li Li; Chen Renjie;

  • 作者单位

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China|Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China|Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mat Sci & Engn, Beijing Key Lab Environm Sci & Engn, Beijing 100081, Peoples R China|Collaborat Innovat Ctr Elect Vehicles Beijing, Beijing 100081, Peoples R China;

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  • 关键词

    charge overpotential; cycle life; discharge product; micrometer-sized RuO2; sodium-O-2 battery;

    机译：超充电电位;循环寿命;放电产物;微米级RuO2;O-2钠电池;

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