Solvent-free Preparation of Electrochemical Capacitor Electrodes Using Metal-free Redox Organic Compounds

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• 作者：Hiroyuki ItoiYuka Yasue ; Keita Suda ; Seiya Katoh ; Hideyuki Hasegawa ; Shinya Hayashi ; Masanao Mitsuoka ; Hiroyuki Iwata ; Yoshimi Ohzawa
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：5
• 期：1
• 页码：556-562
• 全文大小：548K
• ISSN：2168-0485

文摘

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.