Redox poly[Ni(saldMp)] modified activated carbon electrode in electrochemical supercapacitors
Redox poly[Ni(saldMp)] modified activated carbon electrode in electrochemical supercapacitors
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DOI：
10.1016/j.electacta.2010.05.076
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发表时间：
2010-08
影响因子：
6.6
通讯作者：
Fei Gao;Jianling Li;Yakun Zhang;Xindong Wang;F. Kang
中科院分区：
文献类型：
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作者：
Fei Gao;Jianling Li;Yakun Zhang;Xindong Wang;F. Kang
络合物（2,2-二甲基-1,3-丙二胺双（水杨基氨基））-镍（II），[Ni(saldMp)]在乙腈溶液中的活性炭（AC）电极上进行氧化电聚合。通过场发射扫描电子显微镜观察发现，聚[Ni(saldMp)]在交流电极碳颗粒表面呈现出不完整的包覆膜。采用循环伏安法评价了聚[Ni(saldMp)]改性活性炭(PAC)电极在不同电位范围内的电化学行为。通过比较计时电流法实验计算出的 D1/2C 值，PAC 电极的反离子和溶剂膨胀主要发生在 0.6V 以下。当PAC电极电位在1.2V~0.0V范围内时，PAC电极的欧姆电阻和法拉第电阻逐渐接近AC电极。恒电流充放电实验表明，交流电极在高达10mAcm−2的高电流密度下，聚[Ni(saldMp)]薄膜的可逆氧化还原反应有效提高了比电容和能量密度。 PAC 电极的比电容在前 50 个循环中下降，但此后在接下来的 200 个循环中保持恒定。这项研究表明氧化还原聚合物可能是超级电容器中一种有吸引力的材料。
The complex (2,2-dimethyl-1,3-propanediaminebis(salicylideneaminato))–nickel(II), [Ni(saldMp)], was oxidatively electropolymerized on activated carbon (AC) electrode in acetonitrile solution. The poly[Ni(saldMp)] presented an incomplete coated film on the surface of carbon particles of AC electrode by field emission scanning electron microscopy. The electrochemical behaviors of poly[Ni(saldMp)] modified activated carbon (PAC) electrode were evaluated in different potential ranges by cyclic voltammetry. Counterions and solvent swelling mainly occurred up to 0.6V for PAC electrode by the comparison of D1/2C values calculated from chronoamperometry experiments. Both the Ohmic resistance and Faraday resistance of PAC electrode gradually approached to those of AC electrode when its potential was ranging from 1.2V to 0.0V. Galvanostatic charge/discharge experiments indicated that both the specific capacitance and energy density were effectively improved by the reversible redox reaction of poly[Ni(saldMp)] film under the high current density up to 10mAcm−2for AC electrode. The specific capacitance of PAC electrode decreased during the first 50 cycles but thereafter it remained constant for the next 200 cycles. This study showed the redox polymer may be an attractive material in supercapacitors.