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首页> 外文期刊>Advanced Functional Materials >Rapid Inversion of Surface Charges in Heteroatom-Doped Porous Carbon: A Route to Robust Electrochemical Desalination
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Rapid Inversion of Surface Charges in Heteroatom-Doped Porous Carbon: A Route to Robust Electrochemical Desalination

机译：杂原子掺杂多孔碳中表面电荷的快速转化：鲁棒电化学脱盐的途径

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摘要

Given that a considerably large population suffers from shortage of water, there are numerous on-going efforts to turn seawater into freshwater, and electrochemical desalination processes-particularly capacitive deionization (CDI)-have gained significant attention due to their high energy efficiency and reliable performance. Meanwhile, carbonaceous electrode materials, which are most commonly used in CDI systems, have poor long-term stability due to unfavorable interactions with oxygen in saline water. Herein, rapid and vigorous inversion of surface charges in heteroatom-doped carbon electrodes, which leads to a robust operation of CDI with high desalination capacity, is reported for the first time. By carbonization of coffee wastes, nitrogen- and sulfur-codoped activated carbon with hierarchical micro/mesopores are prepared in an environmentally-friendly manner, and this carbon results in a significantly higher inverted capacity than that of various activated carbon counterparts in long-term CDI operations, without any sign of drop in performance. Investigations on the changes in physicochemical properties of the electrodes during the inversion disclose the favorable roles of nitrogen and sulfur dopants, which can be summarized as enlarging the difference between the surface charges of the two electrodes by chemical interactions with oxygen in the anode and carbon in the cathode.
机译：鉴于相当大的人口遭受缺水的困扰，目前正在进行许多将海水转化为淡水的工作，而电化学脱盐工艺，尤其是电容去离子（CDI），由于其高能效和可靠性能而受到了广泛关注。 。同时，由于在盐水中与氧气的不利相互作用，最常在CDI系统中使用的碳质电极材料的长期稳定性很差。在此，首次报道了杂原子掺杂碳电极中表面电荷的快速而剧烈的反转，这导致具有高脱盐能力的CDI的稳健运行。通过咖啡渣的碳化，以环保的方式制备了具有分级微/介孔的氮和硫共混活性炭，与长期使用CDI的各种活性炭对应物相比，这种碳的倒装容量明显更高。操作，而没有任何性能下降的迹象。对电极在反转过程中的理化性质变化的研究揭示了氮和硫掺杂剂的有利作用，可以概括为通过与阳极中的氧和碳中的碳发生化学相互作用来扩大两个电极的表面电荷之间的差异。阴极。

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  • 来源
    《Advanced Functional Materials》 |2020年第9期|1909387.1-1909387.11|共11页
  • 作者

    Kang Jin Soo; Kim Seoni; Chung Dong Young; Son Yoon Jun; Jo Kyusik; Su Xiao; Lee Myeong Jae; Joo Hwajoo; Hatton T. Alan; Yoon Jeyong; Sung Yung-Eun;

  • 作者单位

    Seoul Natl Univ Sch Chem & Biol Engn Seoul 08826 South Korea|Seoul Natl Univ ICP Seoul 08826 South Korea|Ctr Nanoparticle Res IBS Seoul 08826 South Korea|MIT Elect Res Lab Cambridge MA 02139 USA;

    Seoul Natl Univ Sch Chem & Biol Engn Seoul 08826 South Korea|Seoul Natl Univ ICP Seoul 08826 South Korea|MIT Dept Chem Engn Cambridge MA 02139 USA;

    Seoul Natl Univ Sch Chem & Biol Engn Seoul 08826 South Korea|Seoul Natl Univ ICP Seoul 08826 South Korea|Ctr Nanoparticle Res IBS Seoul 08826 South Korea;

    Seoul Natl Univ Sch Chem & Biol Engn Seoul 08826 South Korea|Seoul Natl Univ ICP Seoul 08826 South Korea;

    MIT Dept Chem Engn Cambridge MA 02139 USA|Univ Illinois Dept Chem & Biomol Engn Urbana IL 61801 USA;

    MIT Dept Chem Engn Cambridge MA 02139 USA;

    Seoul Natl Univ Sch Chem & Biol Engn Seoul 08826 South Korea|Seoul Natl Univ ICP Seoul 08826 South Korea|KEI Sejong 30147 South Korea;

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  • 正文语种 eng
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  • 关键词

    capacitive deionization; desalination; heteroatom-doped carbons; surface charges;

    机译：电容去离子海水淡化杂原子掺杂碳表面电荷;

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