Solvent-free Preparation of Electrochemical Capacitor Electrodes Using Metal-free Redox Organic Compounds
Solvent-free Preparation of Electrochemical Capacitor Electrodes Using Metal-free Redox Organic Compounds
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DOI：
10.1021/acssuschemeng.6b01947
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发表时间：
2017-01-01
影响因子：
8.4
通讯作者：
Ohzawa, Yoshimi
中科院分区：
文献类型：
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作者：
Itoi, Hiroyuki;Yasue, Yuka;Ohzawa, Yoshimi
通过无溶剂法，仅一步将无金属氧化还原有机化合物2，5-二氯-1，4-苯醌（DCBQ）精细分散在多孔碳基底Ketjen Black（KB）上。通过这种方法，DCBQ被负载在KB的孔内，多达约100 μ g。60重量%，没有任何附聚。这种高负载沿着高分散性可由于不存在溶剂而获得。由于该方法不含有机溶剂，因此也不含溶剂去除和伴随的纯化过程，在溶剂去除时，有机化合物随着有机化合物浓度的增加而趋于附聚。结果表明，复合材料的体积电容与KB的单位质量电容相关，随DCBQ的负载量增加而增大，具有较高的功率密度和较长的循环寿命。结果表明，该材料的体积电容是KB材料的4.7倍，高倍率性能可达5 A g（-1），沿着具有良好的循环寿命，循环次数可达10000次。这些结果表明，在获得高功率和高能量密度方面，由醌衍生物在多孔碳基底的孔内部诱导的赝电容优于双电层电容。
A metal-free redox organic compound, 2,5-dichloro-1,4-benzoquinone (DCBQ), was finely dispersed over the porous carbon substrate, Ketjen Black (KB), by a solvent-free method in only one step. By using this method, DCBQ was loaded inside the pores of KB with as much as ca. 60 wt % in the sample without any agglomeration. This high loading along with high dispersion can be attained due to the absence of solvent. Since this procedure is free from organic solvents it is also free from solvent removal, at which organic compounds tend to agglomerate as the concentration of organic compounds increases, and the concomitant purification process. The electrochemical behaviors of the resulting composite materials were evaluated, and it was found that the volumetric capacitance, which correlated with the capacitance per unit mass of KB, increased with the loading amount of DCBQ with high power density and long cycle lifetime. The resulting volumetric capacitances reached 4.7 times higher than those of KB and exhibited high rate capability up to 5 A g(-1), along with excellent cycle lifetime up to 10 000 cycles. These results indicate the superiority of the pseudocapacitance induced inside the pores of porous carbon substrates by quinone derivatives over the electric double layer capacitance in gaining both high power and high energy densities.