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首页> 外文期刊>Advanced Functional Materials >Lithiation-lnduced Vacancy Engineering of Co_3O_4 with Improved Faradic Reactivity for High-Performance Supercapacitor
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Lithiation-lnduced Vacancy Engineering of Co_3O_4 with Improved Faradic Reactivity for High-Performance Supercapacitor

机译：CO_3O_4的LiThiation-LNDucation工程，具有改进的高性能超级电容器的法拉米反应性

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摘要

Transition metal oxides are promising electrode candidates for supercapacitor because of their low cost, high theoretical capacity, and good reversibility. However, intrinsically poor electrical conductivity and sluggish reaction kinetics of these oxides normally lead to low specific capacity and slow rate capability of the devices. Herein, a commonly used cobalt oxide is used as an example to demonstrate that lithiation process as a new strategy to enhance its electrochemical performance for supercapacitor application. Detailed characterization reveals that electrochemical lithiation of Co(3)O(4)crystal reduces the coordination of the Co-O band, leading to substantially increased oxygen vacancies (octahedral Co(2+)sites). These vacancies further trigger the formation of a new electronic state in the bandgap, resulting in remarkably improved electrical conductivity and accelerated faradic reactions. The lithiated Co(3)O(4)exhibits a noticeably enhanced specific capacity of 260 mAh g(-1)at 1 A g(-1), approximately fourfold enhancement compared to that of pristine Co3O4(66 mAh g(-1)). The hybrid supercapacitor assembled with lithiated Co3O4//N-doped activated carbon achieves high energy densities in a broad range of power densities, e.g., 76.7 Wh kg(-1)at 0.29 kW kg(-1), 46.9 Wh kg(-1)at a high power density of 18.7 kW kg(-1), outperforming most of the reported hybrid supercapacitors.
机译：过渡金属氧化物对超级电容器的电极候选者是超级电容器，因为它们的成本低，理论容量高，可逆性良好。然而，这些氧化物的内部电导率和缓慢的反应动力学通常导致装置的低比容量和慢速率能力。在此，使用常用的钴氧化物作为示例，以证明锂化方法作为提高其用于超级电容器应用的电化学性能的新策略。详细表征揭示CO（3）O（4）晶体的电化学锂化降低了CO-O频带的协调，导致基本上增加的氧空位（八面体CO（2+）位点）。这些空缺进一步触发了在带隙中形成了新的电子状态，导致导电性显着提高和加速的法拉米反应。锂化的CO（3）O（4）在1A（-1）中表现出明显增强的260mAhg（-1）的特定容量，与原始CO3O4相比，约四倍增强（66mAhg（-1） ）。用锂化CO3O4 // n掺杂的活性炭组装的混合超级电容器在宽范围的功率密度中实现了高能量密度，例如，76.7WHKG（-1），在0.29kg kg（-1），46.9whkg（-1 ）在高功率密度为18.7 kW kg（-1），优于报告的大部分杂交超级电容器。

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  • 来源
    《Advanced Functional Materials》 |2020年第39期|2004172.1-2004172.9|共9页
  • 作者

    Zhang Yu; Hu Yuxiang; Wang Zhiliang; Lin Tongen; Zhu Xiaobo; Luo Bin; Hu Han; Xing Wei; Yan Zifeng; Wang Lianzhou;

  • 作者单位

    China Univ Petr Qingdao State Key Lab Heavy Oil Proc Sch Sci Qingdao 266580 Shandong Peoples R China|Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

    Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

    Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

    Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

    Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

    Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

    China Univ Petr Qingdao State Key Lab Heavy Oil Proc Sch Sci Qingdao 266580 Shandong Peoples R China;

    China Univ Petr Qingdao State Key Lab Heavy Oil Proc Sch Sci Qingdao 266580 Shandong Peoples R China;

    China Univ Petr Qingdao State Key Lab Heavy Oil Proc Sch Sci Qingdao 266580 Shandong Peoples R China;

    Univ Queensland Australian Inst Bioengn & Nanotechnol Nanomat Ctr Brisbane Qld 4072 Australia;

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  • 正文语种 eng
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  • 关键词

    faradic reactions; lithiation process; oxygen vacancies; supercapacitors; transition metal oxides;

    机译：法拉米反应;锂化过程;氧气空位;超级电容器;过渡金属氧化物;

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