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Metal chloride-assisted synthesis of hierarchical porous carbons for high-rate-performance supercapacitor

机译：用于高速率 - 性能超级电容器的金属氯化物辅助合成分层多孔碳

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摘要

Hierarchical porous carbons with high surface area were prepared by direct carbonization of the polymers which were synthesized via a typical sol-gel method, using terephthalaldehyde and resorcinol as carbon precursors, and metal chloride as reaction assistant. All the metal chlorides could efficiently help to form 3-D porous network carbon with inter-linking irregular particles, and also successfully contribute to the developing of meso-macropores through the packing of grains. Such hierarchical porosity plays an important role for rapid ion diffusion, resulting in an excellent rate capability and low diffusion resistance. Moreover, it should be noted that ZnCl2 could also act as an in situ activation agent during the carbonization process to generate large surface area of 1106 m(2) g(-1) and pore volume of 1.2 cm(3) g(-1). In 3 mol L-1 H2SO4, high specific capacitance of 174.6 F g(-1) by using the ZnCl2-assisted hierarchical porous carbon as electrode material is obtained and it could retain ca. 84% when the current density increases from 0.1 A g(-1) to 20 A g(-1). This superior rate capability is higher than that of many hierarchical porous carbons reported in previous literatures. The facile production and excellent electrochemical performance suggested a low cost and effective method to prepare hierarchical porous carbon for energy storage.
机译：具有高表面积的分层多孔碳通过直接碳化通过典型的溶胶 - 凝胶法合成的聚合物，使用对苯二甲和间苯二酚作为碳前体，以及作为反应助剂的金属氯化物。所有金属氯化物都可以有效地帮助形成3-D多孔网络碳，其间相互联系的不规则颗粒，并且还通过包装颗粒成功地促进了中间麦克风的发展。这种分层孔隙度在快速离子扩散中发挥着重要作用，导致优异的速率能力和低扩散抗性。此外，应该注意的是，ZnCl2还可以在碳化过程中用作原位活化剂，以产生1106μm（2 )g（-1）的大表面积，孔体积为1.2cm（3）g（-1 ）。在3 mol L-1 H 2 SO 4中，通过使用ZnCl2辅助的分层多孔碳作为电极材料，高比电容为174.6fg（-1），并且可以保留Ca.当电流密度从0.1Ag（-1）增加至20Ag（-1）时，84％。这种优越的速率能力高于先前文献中报告的许多等级多孔碳的速率。舒适的生产和优异的电化学性能表明了一种低成本和有效的方法，用于制备能量储存的等级多孔碳。

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  • 来源
    《RSC Advances》 |2017年第43期|共8页
  • 作者

    Bing Xuefeng; Jiang Xu; Tian Meng; Wang Jitong; Qiao Wenming; Ling Licheng;

  • 作者单位

    East China Univ Sci &

    Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China;

    East China Univ Sci &

    Technol State Key Lab Chem Engn Shanghai 200237 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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