碳球的结构-性质关系对EDLCs电化学性能的影响研究,Electrochimica Acta

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碳球的结构-性质关系对EDLCs电化学性能的影响研究
Electrochimica Acta ( IF 5.5 ) Pub Date : 2019-03-01 , DOI: 10.1016/j.electacta.2019.02.121
Hee Soo Kim , Muhammad Awais Abbas , Min Seok Kang , Hyuna Kyung , Jin Ho Bang , Won Cheol Yoo

对于高性能的双电层电容器（EDLC），高比表面积（SSA）和N掺杂水平以及碳质材料的小粒径被认为是至关重要的因素。然而，很少有关于碳的结构-性质关系和EDLCs的电化学性能的同步研究的报道。本文中，我们通过使用一系列定义明确的碳，报告了碳的结构性质（如SSA，N掺杂和粒径）与EDLC的电化学性质之间的关系。合成了单分散和大小可调的间苯二酚-甲醛碳（RFC）球，并通过热CO ₂处理将其活化，以使SSA增至3958 m ²/ g（RFC_C390示例）。当根据RFC球的SSA绘制比电容时， 观察到几乎完美的相关性（R ² = 0.99），这证实了比电容与SSA之间的线性关系。此外，合成了N掺杂的黑色素C（MC）球，并随后被激活以实现N掺杂作用。活化的MC（MC_C130），具有相似的SSA（2618 m ² / g）和大小（301 nm），但与（2793 m ²）相比具有不同的N掺杂水平（3.1％）/ g，分别为312 nm和1.3％的激活RFC球体（RFC_C120），更高的比电容（288 F / g），电容保持率（64％）和在5000次循环中的长期稳定性（93％）与RFC对应的那些（分别为260 F / g，58％和90％）相比。为了观察粒径效应，使用相同的SSA（3981、3958和3898 m ²）的RFC球尺寸不同（98、280和579 nm）/ g）和孔径分布，从而使最小的RFC在比电容（360 F / g），电容保持率（70％）和在5000次循环中的长期稳定性方面表现出最佳的EDLC性能（98 ％），所有这些都可以与文献中报道的值进行比较。此外，通过使用电化学阻抗谱分析所有的碳样品，以确认碳球的结构-性质关系与EDLC的电化学性能。

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Study of the structure-properties relations of carbon spheres affecting electrochemical performances of EDLCs

For high performance of electrical double layer capacitors (EDLCs), a high specific surface area (SSA) and N-doping level, and small particle size of carbonaceous materials, have been believed to be crucial factors. However, there have been few reports on simultaneous study of the structure-properties relations of carbons and the electrochemical performances of EDLCs. Herein, we report the relationship between the structural properties of carbons, such as the SSA, N-doping, and particle size, and the electrochemical properties of EDLCs by using a series of well-defined carbons. Monodisperse and size-tunable resorcinol-formaldehyde carbon (RFC) spheres were synthesized and activated by hot CO₂ treatment to increase the SSA up to 3958 m²/g (RFC_C390 sample). When the specific capacitances of the RFC spheres were plotted in terms of their SSAs, an almost perfect correlation (R² = 0.99) was observed, which confirmed the linear relationship between the specific capacitance and the SSA. In addition, N-doped melanin C (MC) spheres were synthesized and subsequently activated for N-doping effect. Activated MC (MC_C130), which exhibited similar SSA (2618 m²/g) and size (301 nm) but a different N-doping level (3.1%) compared with those (2793 m²/g, 312 nm, and 1.3%, respectively) of the activated RFC spheres (RFC_C120), displayed higher specific capacitance (288 F/g), capacitance retention (64%), and long term stability over 5000 cycles (93%) compared with those (260 F/g, 58%, and 90%, respectively) of the RFC counterparts. To observe the particle size effect, different sizes (98, 280, and 579 nm) of RFC spheres with similar SSAs (3981, 3958, and 3898 m²/g, respectively) and pore size distributions were prepared, such that the smallest RFC revealed the best EDLC performance in terms of specific capacitance (360 F/g), capacitance retention (70%), and long term stability over 5000 cycles (98%), all of which could be compared with the values reported in the literature. Furthermore, all of the Carbon samples were analyzed by using electrochemical impedance spectroscopy for confirming the structure-properties relations of carbon spheres with the electrochemical performances of EDLCs.

更新日期：2019-03-01

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