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首页> 外文期刊>RSC Advances >Rapid microwave activation of waste palm into hierarchical porous carbons for supercapacitors using biochars from different carbonization temperatures as catalysts
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Rapid microwave activation of waste palm into hierarchical porous carbons for supercapacitors using biochars from different carbonization temperatures as catalysts

机译：使用不同碳化温度作为催化剂的碳化温度快速微波棕榈进入水上多孔碳的垃圾棕榈碳

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摘要

A rapid, simple and cost-effective approach to prepare hierarchical porous carbons (PCs) for supercapacitors is reported by microwave activation of abundant and low-cost waste palm, biochar (BC) and KOH. BCs from waste palm at different carbonization temperatures (300-700 degrees C), as catalysts and microwave receptors, were used here for the first time to facilitate the conversion of waste palm into hierarchical PCs. As a result, the high-graphitization PC obtained at a BC carbonization temperature of 300 degrees C (PC-300) possessed a high surface area (1755 m(2) g(-1)), a high pore volume (0.942 cm(3) g(-1)) and a moderate mesoporosity (37.79%). Besides their high-graphitization and hierarchical porous structure, the oxygen doping in PC-300 can also promote the rapid transport of electrolyte ions. The symmetric supercapacitor based on the PC-300 even in PVA/LiCl gel electrolyte exhibited a high specific capacitance of 164.8 F g(-1) at a current density of 0.5 A g(-1) and retained a specific capacitance of 121.3 F g(-1) at 10 A g(-1), demonstrating a superior rate capacity of 73.6%. Additionally, the PC-300 supercapacitor delivered a high energy density of 14.6 W h kg(-1) at a power density of 398.9 W kg(-1) and maintained an energy density of 10.8 W h kg(-1) at a high power density of 8016.5 W kg(-1), as well as an excellent cycling stability after 2000 cycles with a capacitance retention of 92.06%.
机译：通过微波激活丰富和低成本的废旧棕榈，生物炭（BC）和KOH，报道了一种快速，简单且经济高效的制备超级电容器的分层多孔碳（PC）的方法。来自不同碳化温度（300-700℃）的废棕榈的BCS在这里首次使用催化剂和微波受体，以便于将废掌梁转化为等级PC。结果，在300摄氏度（PC-300）的BC碳化温度下获得的高图石化PC具有高表面积（1755m（2）G（-1）），高孔体积（0.942cm（ 3）G（-1））和中等的介体（37.79％）。除了它们的高图形化和分层多孔结构之外，PC-300中的氧气还可以促进电解质离子的快速运输。基于对称超级电容器PC-300即使在PVA /氯化锂凝胶电解质展出的0.5 A g的电流密度的164.8 F G（-1）的高的比电容（-1），保留121.3 F G比电容（-1）在10克（-1），展示优越的速率容量为73.6％。另外，PC-300超级电容器以398.9W kg（-1）的功率密度，在功率密度下提供14.6Wh kg（-1）的高能量密度，并在高处保持10.8Wh kg（-1）的能量密度8016.5 W kg（-1）的功率密度，以及2000次循环后的优异循环稳定性，电容保留为92.06％。

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  • 来源
    《RSC Advances》 |2019年第34期|共9页
  • 作者

    Liu Chaozheng; Chen Weimin; Li Meichun; Hong Shu; Li Wanzhao; Pan Mingzhu; Wu Qinglin; Mei Changtong;

  • 作者单位

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

    Louisiana State Univ Sch Renewable Nat Resources Baton Rouge LA 70803 USA;

    Nanjing Forestry Univ Coll Mat Sci &

    Engn 159 Longpan Rd Nanjing 210037 Jiangsu Peoples R China;

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